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<h3>
Marge Bot pushed to branch master
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bfdccac6acce84e15292a454d12f4e0d87ef6f10">bfdccac6</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-10-09T08:52:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix desugaring of record updates on data families
This fixes a long-standing bug in the desugaring of record
updates for data families, when the latter involves a GADT. It's
all explained in Note [Update for GADTs] in GHC.HsToCore.Expr.
Building the correct cast is surprisingly tricky, as that Note
explains.
Fixes #18809. The test case (in indexed-types/should_compile/T18809)
contains several examples that exercise the dark corners.
</pre>
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<h4>8 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#783e5dae6e86931f06700fc088fb7d48c8a07386">
compiler/GHC/Core/Coercion.hs
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<li class="file-stats">
<a href="#6fcf64907fb5bdd93082d2d1eb94e4566e735865">
compiler/GHC/Core/DataCon.hs
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<li class="file-stats">
<a href="#8ee6f6851986ea96987a52f1dbf39228c85c6032">
compiler/GHC/Core/TyCo/Subst.hs
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<li class="file-stats">
<a href="#cc97d81e7223ad4a3a5e801156ca632f9fa75654">
compiler/GHC/Hs/Expr.hs
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<li class="file-stats">
<a href="#6bdd5abc649727f2a802bc96ce5c276de19d3726">
compiler/GHC/HsToCore/Expr.hs
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<li class="file-stats">
<a href="#46e7b59eca287d43c19d0d8902b41f5d04f0d268">
compiler/GHC/Tc/Types/Evidence.hs
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<li class="file-stats">
<a href="#9ac3b381002bb0296436d38ebcf91cf6fc5ac9ea">
<span class="new-file">
+
testsuite/tests/indexed-types/should_compile/T18809.hs
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</a>
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<li class="file-stats">
<a href="#58b9bc2ffb1c7d7b545e6aada524a5d53266e95e">
testsuite/tests/indexed-types/should_compile/all.T
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<h4>Changes:</h4>
<li id="783e5dae6e86931f06700fc088fb7d48c8a07386">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bfdccac6acce84e15292a454d12f4e0d87ef6f10#783e5dae6e86931f06700fc088fb7d48c8a07386"><strong>compiler/GHC/Core/Coercion.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">@@ -41,6 +41,7 @@ module GHC.Core.Coercion (</td>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">downgradeRole</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkAxiomRuleCo</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkGReflRightCo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkGReflLeftCo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkCoherenceLeftCo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkCoherenceRightCo</span><span class="p">,</span></span>
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43
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkKindCo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">castCoercionKind</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">castCoercionKindI</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC44" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkFamilyTyConAppCo</span><span class="p">,</span></span>
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44
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45
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkHeteroCoercionType</span><span class="p">,</span></span>
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46
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkPrimEqPred</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkReprPrimEqPred</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkPrimEqPredRole</span><span class="p">,</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1528" 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="1529" 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">@@ -1528,6 +1529,27 @@ castCoercionKindI g h1 h2</td>
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<td class="diff-line-num new_line" data-linenumber="1529" 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="LC1529" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkCoherenceRightCo</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">t2</span> <span class="n" style="color: #333;">h2</span> <span class="p">(</span><span class="n" style="color: #333;">mkCoherenceLeftCo</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">t1</span> <span class="n" style="color: #333;">h1</span> <span class="n" style="color: #333;">g</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1530" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Pair</span> <span class="n" style="color: #333;">t1</span> <span class="n" style="color: #333;">t2</span><span class="p">,</span> <span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">coercionKindRole</span> <span class="n" style="color: #333;">g</span></span>
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<pre style="margin: 0;"> <span id="LC1531" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1532" class="line" lang="haskell"><span class="n" style="color: #333;">mkFamilyTyConAppCo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoercionN</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoercionN</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1533" 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="LC1533" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ^ Given a family instance 'TyCon' and its arg 'Coercion's, return the</span></span>
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<pre style="margin: 0;">+<span id="LC1534" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- corresponding family 'Coercion'. E.g:</span></span>
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<pre style="margin: 0;">+<span id="LC1535" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC1536" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- > data family T a</span></span>
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<pre style="margin: 0;">+<span id="LC1537" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- > data instance T (Maybe b) = MkT b</span></span>
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<pre style="margin: 0;">+<span id="LC1538" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC1539" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Where the instance 'TyCon' is :RTL, so:</span></span>
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<pre style="margin: 0;">+<span id="LC1540" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC1541" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- > mkFamilyTyConAppCo :RTL (co :: a ~# Int) = T (Maybe a) ~# T (Maybe Int)</span></span>
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1542
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<pre style="margin: 0;">+<span id="LC1542" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC1543" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- cf. 'mkFamilyTyConApp'</span></span>
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1544
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<pre style="margin: 0;">+<span id="LC1544" class="line" lang="haskell"><span class="n" style="color: #333;">mkFamilyTyConAppCo</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">cos</span></span>
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<pre style="margin: 0;">+<span id="LC1545" 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;">fam_tc</span><span class="p">,</span> <span class="n" style="color: #333;">fam_tys</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tyConFamInst_maybe</span> <span class="n" style="color: #333;">tc</span></span>
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<pre style="margin: 0;">+<span id="LC1546" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyConTyVars</span> <span class="n" style="color: #333;">tc</span></span>
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1547
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<pre style="margin: 0;">+<span id="LC1547" class="line" lang="haskell"> <span class="n" style="color: #333;">fam_cos</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT2</span><span class="p">(</span> <span class="n" style="color: #333;">tvs</span> <span class="p">`</span><span class="n" style="color: #333;">equalLength</span><span class="p">`</span> <span class="n" style="color: #333;">cos</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tc</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cos</span> <span class="p">)</span></span>
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1548
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<pre style="margin: 0;">+<span id="LC1548" class="line" lang="haskell"> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">liftCoSubstWith</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">cos</span><span class="p">)</span> <span class="n" style="color: #333;">fam_tys</span></span>
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<pre style="margin: 0;">+<span id="LC1549" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyConAppCo</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">fam_cos</span></span>
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<pre style="margin: 0;">+<span id="LC1550" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;">+<span id="LC1551" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyConAppCo</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">cos</span></span>
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<pre style="margin: 0;">+<span id="LC1552" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1553" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See note [Newtype coercions] in GHC.Core.TyCon</span></span>
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1532
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1554
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<pre style="margin: 0;"> <span id="LC1554" class="line" lang="haskell"></span>
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1533
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<pre style="margin: 0;"> <span id="LC1555" class="line" lang="haskell"><span class="n" style="color: #333;">mkPiCos</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Role</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Var</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</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">@@ -581,6 +581,7 @@ variables:</td>
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<pre style="margin: 0;"> <span id="LC581" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> purposes of TypeApplications, and as a consequence, they do not come equipped</span></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;"> with visibilities (that is, they are TyVars/TyCoVars instead of</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;"> TyCoVarBinders).</span></span>
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<pre style="margin: 0;">+<span id="LC584" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC585" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* dcUserTyVarBinders, for the type variables binders in the order in which they</span></span>
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<pre style="margin: 0;"> <span id="LC586" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> originally arose in the user-written type signature. Their order *does* matter</span></span>
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<pre style="margin: 0;"> <span id="LC587" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> for TypeApplications, so they are full TyVarBinders, complete with</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">@@ -601,10 +602,10 @@ dcExTyCoVars. That is, the tyvars in dcUserTyVarBinders are a permutation of</td>
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<pre style="margin: 0;"> <span id="LC602" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">ordering, they in fact share the same type variables (with the same Uniques). We</span></span>
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<pre style="margin: 0;"> <span id="LC603" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">sometimes refer to this as "the dcUserTyVarBinders invariant".</span></span>
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<pre style="margin: 0;"> <span id="LC604" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC604" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">dcUserTyVarBinders, as the name suggests, is the one that users will<span class="idiff left right"> see most of</span></span></span>
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<pre style="margin: 0;">-<span id="LC605" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">the time. It's used when computing the type signature of a data constructor (see</span></span></span>
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<pre style="margin: 0;">-<span id="LC606" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">data<span class="idiff left right">ConWrapperType), and as a result, it's what matters from a TypeApplications</span></span></span>
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<pre style="margin: 0;">-<span id="LC607" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">perspective.</span></span>
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<pre style="margin: 0;">+<span id="LC605" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">dcUserTyVarBinders, as the name suggests, is the one that users will</span></span>
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<pre style="margin: 0;">+<span id="LC606" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">see most of the time. It's used when computing the type signature of a</span></span></span>
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<pre style="margin: 0;">+<span id="LC607" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">data<span class="idiff left right"> constructor wrapper (see dataConWrapperType), and as a result,</span></span></span>
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<pre style="margin: 0;">+<span id="LC608" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">it's what matters from a TypeApplications </span>perspective.</span></span>
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<pre style="margin: 0;"> <span id="LC609" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC610" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [The dcEqSpec domain invariant]</span></span>
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<pre style="margin: 0;"> <span id="LC611" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bfdccac6acce84e15292a454d12f4e0d87ef6f10#8ee6f6851986ea96987a52f1dbf39228c85c6032"><strong>compiler/GHC/Core/TyCo/Subst.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">@@ -436,8 +436,8 @@ mkTvSubstPrs prs =</td>
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<pre style="margin: 0;"> <span id="LC436" class="line" lang="haskell"><span class="n" style="color: #333;">zipTyEnv</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HasDebugCallStack</span> <span class="o" style="font-weight: 600;">=></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</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;">TvSubstEnv</span></span>
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<pre style="margin: 0;"> <span id="LC437" class="line" lang="haskell"><span class="n" style="color: #333;">zipTyEnv</span> <span class="n" style="color: #333;">tyvars</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;"> <span id="LC438" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">debugIsOn</span></span>
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<pre style="margin: 0;">-<span id="LC439" 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;">all</span> <span class="n" style="color: #333;">isTyVar</span> <span class="n" style="color: #333;">tyvars</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC440" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"zipTyEnv"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tyvars</span> <span class="o" style="font-weight: 600;"><span class="idiff left right"><+></span></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC439" 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;">all</span> <span class="n" style="color: #333;">isTyVar</span> <span class="n" style="color: #333;">tyvars</span><span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff">&&</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">tyvars</span></span><span class="idiff"> </span><span class="p"><span class="idiff">`</span></span><span class="n" style="color: #333;"><span class="idiff">equalLength</span></span><span class="p"><span class="idiff">`</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tys</span></span><span class="p"><span class="idiff right">)</span>)</span></span>
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<pre style="margin: 0;">+<span id="LC440" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"zipTyEnv"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tyvars</span> <span class="o" style="font-weight: 600;"><span class="idiff left right">$$</span></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC441" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;"> <span id="LC442" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">all</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">isCoercionTy</span><span class="p">)</span> <span class="n" style="color: #333;">tys</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC443" class="line" lang="haskell"> <span class="n" style="color: #333;">zipToUFM</span> <span class="n" style="color: #333;">tyvars</span> <span class="n" style="color: #333;">tys</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bfdccac6acce84e15292a454d12f4e0d87ef6f10#cc97d81e7223ad4a3a5e801156ca632f9fa75654"><strong>compiler/GHC/Hs/Expr.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">@@ -577,8 +577,9 @@ data RecordUpdTc = RecordUpdTc</td>
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<pre style="margin: 0;"> <span id="LC577" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC578" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">rupd_in_tys</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="c1" style="color: #998; font-style: italic;">-- Argument types of *input* record type</span></span>
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579
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<pre style="margin: 0;"> <span id="LC579" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">rupd_out_tys</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="c1" style="color: #998; font-style: italic;">-- and *output* record type</span></span>
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580
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<pre style="margin: 0;">-<span id="LC580" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The original type can be reconstructed</span></span>
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<pre style="margin: 0;">-<span id="LC581" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- with conLikeResTy</span></span>
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<pre style="margin: 0;">+<span id="LC580" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- For a data family, these are the type args of the</span></span>
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<pre style="margin: 0;">+<span id="LC581" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- /representation/ type constructor</span></span>
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<pre style="margin: 0;">+<span id="LC582" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC583" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">rupd_wrap</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsWrapper</span> <span class="c1" style="color: #998; font-style: italic;">-- See note [Record Update HsWrapper]</span></span>
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<pre style="margin: 0;"> <span id="LC584" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC585" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bfdccac6acce84e15292a454d12f4e0d87ef6f10#6bdd5abc649727f2a802bc96ce5c276de19d3726"><strong>compiler/GHC/HsToCore/Expr.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">@@ -45,6 +45,7 @@ import GHC.Tc.Types.Evidence</td>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Monad</span></span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Type</span></span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Multiplicity</span></span>
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Coercion</span><span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="p">)</span></span>
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48
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core</span></span>
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49
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Utils</span></span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Make</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="53" 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="54" 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">@@ -53,6 +54,7 @@ import GHC.Driver.Session</td>
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.CostCentre</span></span>
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Id</span></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;">GHC.Types.Id.Make</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;">GHC.Types.Var.Env</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;">GHC.Unit.Module</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="nn" style="color: #555;">GHC.Core.ConLike</span></span>
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.DataCon</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">@@ -61,14 +63,12 @@ import GHC.Builtin.Types</td>
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<pre style="margin: 0;"> <span id="LC63" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Builtin.Names</span></span>
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<pre style="margin: 0;"> <span id="LC64" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Basic</span></span>
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<pre style="margin: 0;"> <span id="LC65" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.Maybe</span></span>
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<pre style="margin: 0;">-<span id="LC64" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var.Env</span></span>
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<pre style="margin: 0;"> <span id="LC66" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.SrcLoc</span></span>
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<pre style="margin: 0;"> <span id="LC67" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Misc</span></span>
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<pre style="margin: 0;"> <span id="LC68" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.Bag</span></span>
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<pre style="margin: 0;"> <span id="LC69" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Outputable</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">Outputable</span></span>
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<pre style="margin: 0;"> <span id="LC70" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Panic</span></span>
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.PatSyn</span></span>
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<pre style="margin: 0;">-<span id="LC71" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC72" 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="LC73" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC74" 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">@@ -618,13 +618,70 @@ Note [Update for GADTs]</td>
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<pre style="margin: 0;"> <span id="LC618" 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="LC619" 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="LC620" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T a b where</span></span>
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<pre style="margin: 0;">-<span id="LC621" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> T1 :: { f1 :: a } -> T a Int</span></span>
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<pre style="margin: 0;">+<span id="LC621" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkT :: { foo :: a } -> T a Int</span></span>
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<pre style="margin: 0;">+<span id="LC622" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC623" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> upd :: T s t -> s -> T s t</span></span>
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<pre style="margin: 0;">+<span id="LC624" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> upd z y = z { foo = y}</span></span>
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<pre style="margin: 0;">+<span id="LC625" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC626" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We need to get this:</span></span>
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<pre style="margin: 0;">+<span id="LC627" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> $WMkT :: a -> T a Int</span></span>
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<pre style="margin: 0;">+<span id="LC628" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkT :: (b ~# Int) => a -> T a b</span></span>
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<pre style="margin: 0;">+<span id="LC629" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC630" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> upd = /\s t. \(z::T s t) (y::s) -></span></span>
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<pre style="margin: 0;">+<span id="LC631" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> case z of</span></span>
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<pre style="margin: 0;">+<span id="LC632" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkT (co :: t ~# Int) _ -> $WMkT @s y |> T (Refl s) (Sym co)</span></span>
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<pre style="margin: 0;"> <span id="LC633" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC623" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Then the wrapper function for T1 has type</span></span>
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<pre style="margin: 0;">-<span id="LC624" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> $WT1 :: a -> T a Int</span></span>
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<pre style="margin: 0;">-<span id="LC625" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But if x::T a b, then</span></span>
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626
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<pre style="margin: 0;">-<span id="LC626" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> x { f1 = v } :: T a b (not T a Int!)</span></span>
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627
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<pre style="margin: 0;">-<span id="LC627" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So we need to cast (T a Int) to (T a b). Sigh.</span></span>
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634
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<pre style="margin: 0;">+<span id="LC634" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note the final cast</span></span>
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635
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<pre style="margin: 0;">+<span id="LC635" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> T (Refl s) (Sym co) :: T s Int ~ T s t</span></span>
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636
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<pre style="margin: 0;">+<span id="LC636" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">which uses co, bound by the GADT match. This is the wrap_co coercion</span></span>
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637
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<pre style="margin: 0;">+<span id="LC637" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in wrapped_rhs. How do we produce it?</span></span>
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638
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<pre style="margin: 0;">+<span id="LC638" class="line" lang="haskell"></span>
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639
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<pre style="margin: 0;">+<span id="LC639" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Start with raw materials</span></span>
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640
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<pre style="margin: 0;">+<span id="LC640" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> tc, the tycon: T</span></span>
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<pre style="margin: 0;">+<span id="LC641" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> univ_tvs, the universally quantified tyvars of MkT: a,b</span></span>
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<pre style="margin: 0;">+<span id="LC642" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> NB: these are in 1-1 correspondence with the tyvars of tc</span></span>
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<pre style="margin: 0;">+<span id="LC643" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC644" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Form univ_cos, a coercion for each of tc's args: (Refl s) (Sym co)</span></span>
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645
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<pre style="margin: 0;">+<span id="LC645" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We replaced</span></span>
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<pre style="margin: 0;">+<span id="LC646" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a by (Refl s) since 's' instantiates 'a'</span></span>
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<pre style="margin: 0;">+<span id="LC647" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> b by (Sym co) since 'b' is in the data-con's EqSpec</span></span>
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648
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<pre style="margin: 0;">+<span id="LC648" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC649" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Then form the coercion T (Refl s) (Sym co)</span></span>
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650
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<pre style="margin: 0;">+<span id="LC650" class="line" lang="haskell"></span>
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651
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<pre style="margin: 0;">+<span id="LC651" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">It gets more complicated when data families are involved (#18809).</span></span>
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652
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<pre style="margin: 0;">+<span id="LC652" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider</span></span>
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653
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<pre style="margin: 0;">+<span id="LC653" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data family F x</span></span>
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654
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<pre style="margin: 0;">+<span id="LC654" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data instance F (a,b) where</span></span>
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655
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<pre style="margin: 0;">+<span id="LC655" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkF :: { foo :: Int } -> F (Int,b)</span></span>
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<pre style="margin: 0;">+<span id="LC657" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> bar :: F (s,t) -> Int -> F (s,t)</span></span>
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<pre style="margin: 0;">+<span id="LC658" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> bar z y = z { foo = y}</span></span>
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<pre style="margin: 0;">+<span id="LC660" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We have</span></span>
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<pre style="margin: 0;">+<span id="LC661" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data R:FPair a b where</span></span>
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<pre style="margin: 0;">+<span id="LC662" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkF :: { foo :: Int } -> R:FPair Int b</span></span>
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<pre style="margin: 0;">+<span id="LC664" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> $WMkF :: Int -> F (Int,b)</span></span>
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<pre style="margin: 0;">+<span id="LC665" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkF :: forall a b. (a ~# Int) => Int -> R:FPair a b</span></span>
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<pre style="margin: 0;">+<span id="LC667" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> bar :: F (s,t) -> Int -> F (s,t)</span></span>
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<pre style="margin: 0;">+<span id="LC668" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> bar = /\s t. \(z::F (s,t)) \(y::Int) -></span></span>
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<pre style="margin: 0;">+<span id="LC669" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> case z |> co1 of</span></span>
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<pre style="margin: 0;">+<span id="LC670" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkF (co2::s ~# Int) _ -> $WMkF @t y |> co3</span></span>
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<pre style="margin: 0;">+<span id="LC671" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC672" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(Side note: here (z |> co1) is built by typechecking the scrutinee, so</span></span>
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<pre style="margin: 0;">+<span id="LC673" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we ignore it here. In general the scrutinee is an aribtrary expression.)</span></span>
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<pre style="margin: 0;">+<span id="LC674" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC675" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The question is: what is co3, the cast for the RHS?</span></span>
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<pre style="margin: 0;">+<span id="LC676" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> co3 :: F (Int,t) ~ F (s,t)</span></span>
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677
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<pre style="margin: 0;">+<span id="LC677" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Again, we can construct it using co2, bound by the GADT match.</span></span>
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<pre style="margin: 0;">+<span id="LC678" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We do /exactly/ the same as the non-family case up to building</span></span>
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679
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<pre style="margin: 0;">+<span id="LC679" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">univ_cos. But that gives us</span></span>
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<pre style="margin: 0;">+<span id="LC680" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> rep_tc: R:FPair</span></span>
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<pre style="margin: 0;">+<span id="LC681" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> univ_cos: (Sym co2) (Refl t)</span></span>
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<pre style="margin: 0;">+<span id="LC682" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But then we use mkTcFamilyTyConAppCo to "lift" this to the coercion</span></span>
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<pre style="margin: 0;">+<span id="LC683" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we want, namely</span></span>
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<pre style="margin: 0;">+<span id="LC684" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> F (Sym co2, Refl t) :: F (Int,t) ~ F (s,t)</span></span>
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<pre style="margin: 0;"> <span id="LC685" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC686" 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="LC687" 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">@@ -711,8 +768,7 @@ dsExpr expr@(RecordUpd { rupd_expr = record_expr, rupd_flds = fields</td>
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<pre style="margin: 0;"> <span id="LC768" class="line" lang="haskell"> <span class="n" style="color: #333;">dict_req_wrap</span> <span class="o" style="font-weight: 600;"><.></span></span>
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769
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<pre style="margin: 0;"> <span id="LC769" class="line" lang="haskell"> <span class="n" style="color: #333;">mkWpTyApps</span> <span class="p">[</span> <span class="n" style="color: #333;">lookupTyVar</span> <span class="n" style="color: #333;">out_subst</span> <span class="n" style="color: #333;">tv</span></span>
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<pre style="margin: 0;"> <span id="LC770" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">orElse</span><span class="p">`</span> <span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">tv</span></span>
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<pre style="margin: 0;">-<span id="LC714" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">user_tvs</span></span>
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<pre style="margin: 0;">-<span id="LC715" 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;">tv</span> <span class="p">`</span><span class="n" style="color: #333;">elemVarEnv</span><span class="p">`</span> <span class="n" style="color: #333;">wrap_subst</span><span class="p">)</span> <span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC771" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">user_tvs</span> <span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC772" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Be sure to use user_tvs (which may be ordered</span></span>
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<pre style="margin: 0;"> <span id="LC773" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- differently than `univ_tvs ++ ex_tvs) above.</span></span>
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<pre style="margin: 0;"> <span id="LC774" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [DataCon user type variable binders]</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">@@ -723,27 +779,30 @@ dsExpr expr@(RecordUpd { rupd_expr = record_expr, rupd_flds = fields</td>
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723
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<pre style="margin: 0;"> <span id="LC779" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Update for GADTs]</span></span>
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780
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<pre style="margin: 0;"> <span id="LC780" class="line" lang="haskell"> <span class="n" style="color: #333;">wrapped_rhs</span> <span class="o" style="font-weight: 600;">=</span></span>
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781
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<pre style="margin: 0;"> <span id="LC781" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">con</span> <span class="kr" style="font-weight: 600;">of</span></span>
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726
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<pre style="margin: 0;">-<span id="LC726" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">data_con</span> <span class="o" style="font-weight: 600;">-></span></span>
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727
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<pre style="margin: 0;">-<span id="LC727" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span></span>
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<pre style="margin: 0;">-<span id="LC728" class="line" lang="haskell"> <span class="n" style="color: #333;">wrap_co</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">-<span id="LC729" class="line" lang="haskell"> <span class="n" style="color: #333;">mkTcTyConAppCo</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span></span>
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<pre style="margin: 0;">-<span id="LC730" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">dataConTyCon</span> <span class="n" style="color: #333;">data_con</span><span class="p">)</span></span>
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731
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<pre style="margin: 0;">-<span id="LC731" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">lookup</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">ty</span></span>
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732
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<pre style="margin: 0;">-<span id="LC732" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">tv</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 class="n" style="color: #333;">univ_tvs</span> <span class="p">`</span><span class="n" style="color: #333;">zip</span><span class="p">`</span> <span class="n" style="color: #333;">out_inst_tys</span> <span class="p">]</span></span>
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733
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<pre style="margin: 0;">-<span id="LC733" class="line" lang="haskell"> <span class="n" style="color: #333;">lookup</span> <span class="n" style="color: #333;">univ_tv</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span></span>
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734
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<pre style="margin: 0;">-<span id="LC734" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lookupVarEnv</span> <span class="n" style="color: #333;">wrap_subst</span> <span class="n" style="color: #333;">univ_tv</span> <span class="kr" style="font-weight: 600;">of</span></span>
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735
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<pre style="margin: 0;">-<span id="LC735" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">co'</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">co'</span></span>
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736
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<pre style="margin: 0;">-<span id="LC736" 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;">mkTcReflCo</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">ty</span></span>
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737
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<pre style="margin: 0;">-<span id="LC737" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">eq_spec</span></span>
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738
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<pre style="margin: 0;">-<span id="LC738" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">rhs</span></span>
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739
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<pre style="margin: 0;">-<span id="LC739" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">mkLHsWrap</span> <span class="p">(</span><span class="n" style="color: #333;">mkWpCastN</span> <span class="n" style="color: #333;">wrap_co</span><span class="p">)</span> <span class="n" style="color: #333;">rhs</span></span>
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782
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<pre style="margin: 0;">+<span id="LC782" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">data_con</span></span>
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<pre style="margin: 0;">+<span id="LC783" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">eq_spec</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;">+<span id="LC784" 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;">mkLHsWrap</span> <span class="p">(</span><span class="n" style="color: #333;">mkWpCastN</span> <span class="n" style="color: #333;">wrap_co</span><span class="p">)</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;">+<span id="LC785" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This wrap is the punchline: Note [Update for GADTs]</span></span>
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786
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<pre style="margin: 0;">+<span id="LC786" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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787
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<pre style="margin: 0;">+<span id="LC787" class="line" lang="haskell"> <span class="n" style="color: #333;">rep_tc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dataConTyCon</span> <span class="n" style="color: #333;">data_con</span></span>
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788
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<pre style="margin: 0;">+<span id="LC788" class="line" lang="haskell"> <span class="n" style="color: #333;">wrap_co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTcFamilyTyConAppCo</span> <span class="n" style="color: #333;">rep_tc</span> <span class="n" style="color: #333;">univ_cos</span></span>
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<pre style="margin: 0;">+<span id="LC789" class="line" lang="haskell"> <span class="n" style="color: #333;">univ_cos</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">zipWithEqual</span> <span class="s" style="color: #d14;">"dsExpr:upd"</span> <span class="n" style="color: #333;">mk_univ_co</span> <span class="n" style="color: #333;">univ_tvs</span> <span class="n" style="color: #333;">out_inst_tys</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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<pre style="margin: 0;">+<span id="LC791" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_univ_co</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyVar</span> <span class="c1" style="color: #998; font-style: italic;">-- Universal tyvar from the DataCon</span></span>
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<pre style="margin: 0;">+<span id="LC792" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="c1" style="color: #998; font-style: italic;">-- Corresponding instantiating type</span></span>
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<pre style="margin: 0;">+<span id="LC793" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span></span>
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<pre style="margin: 0;">+<span id="LC794" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_univ_co</span> <span class="n" style="color: #333;">univ_tv</span> <span class="n" style="color: #333;">inst_ty</span></span>
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<pre style="margin: 0;">+<span id="LC795" 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;">lookupVarEnv</span> <span class="n" style="color: #333;">eq_spec_env</span> <span class="n" style="color: #333;">univ_tv</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC796" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">co</span></span>
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<pre style="margin: 0;">+<span id="LC797" 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;">mkTcNomReflCo</span> <span class="n" style="color: #333;">inst_ty</span></span>
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798
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<pre style="margin: 0;">+<span id="LC798" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC799" class="line" lang="haskell"> <span class="n" style="color: #333;">eq_spec_env</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">VarEnv</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span></span>
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<pre style="margin: 0;">+<span id="LC800" class="line" lang="haskell"> <span class="n" style="color: #333;">eq_spec_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkVarEnv</span> <span class="p">[</span> <span class="p">(</span><span class="n" style="color: #333;">eqSpecTyVar</span> <span class="n" style="color: #333;">spec</span><span class="p">,</span> <span class="n" style="color: #333;">mkTcSymCo</span> <span class="p">(</span><span class="n" style="color: #333;">mkTcCoVarCo</span> <span class="n" style="color: #333;">eqs_var</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC801" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">spec</span><span class="p">,</span><span class="n" style="color: #333;">eqs_var</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zipEqual</span> <span class="s" style="color: #d14;">"dsExpr:upd2"</span> <span class="n" style="color: #333;">eq_spec</span> <span class="n" style="color: #333;">eqs_vars</span> <span class="p">]</span></span>
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802
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<pre style="margin: 0;">+<span id="LC802" class="line" lang="haskell"></span>
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803
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<pre style="margin: 0;"> <span id="LC803" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- eq_spec is always null for a PatSynCon</span></span>
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741
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<pre style="margin: 0;"> <span id="LC804" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PatSynCon</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">rhs</span></span>
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805
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<pre style="margin: 0;"> <span id="LC805" class="line" lang="haskell"></span>
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743
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<pre style="margin: 0;">-<span id="LC743" class="line" lang="haskell"> <span class="n" style="color: #333;">wrap_subst</span> <span class="o" style="font-weight: 600;">=</span></span>
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744
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<pre style="margin: 0;">-<span id="LC744" class="line" lang="haskell"> <span class="n" style="color: #333;">mkVarEnv</span> <span class="p">[</span> <span class="p">(</span><span class="n" style="color: #333;">tv</span><span class="p">,</span> <span class="n" style="color: #333;">mkTcSymCo</span> <span class="p">(</span><span class="n" style="color: #333;">mkTcCoVarCo</span> <span class="n" style="color: #333;">eq_var</span><span class="p">))</span></span>
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745
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<pre style="margin: 0;">-<span id="LC745" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">spec</span><span class="p">,</span> <span class="n" style="color: #333;">eq_var</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">eq_spec</span> <span class="p">`</span><span class="n" style="color: #333;">zip</span><span class="p">`</span> <span class="n" style="color: #333;">eqs_vars</span></span>
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746
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<pre style="margin: 0;">-<span id="LC746" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eqSpecTyVar</span> <span class="n" style="color: #333;">spec</span> <span class="p">]</span></span>
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806
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<pre style="margin: 0;"> <span id="LC806" class="line" lang="haskell"></span>
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748
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807
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<pre style="margin: 0;"> <span id="LC807" class="line" lang="haskell"> <span class="n" style="color: #333;">req_wrap</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dict_req_wrap</span> <span class="o" style="font-weight: 600;"><.></span> <span class="n" style="color: #333;">mkWpTyApps</span> <span class="n" style="color: #333;">in_inst_tys</span></span>
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749
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<pre style="margin: 0;"> <span id="LC808" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bfdccac6acce84e15292a454d12f4e0d87ef6f10#46e7b59eca287d43c19d0d8902b41f5d04f0d268"><strong>compiler/GHC/Tc/Types/Evidence.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">@@ -48,6 +48,7 @@ module GHC.Tc.Types.Evidence (</td>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkTcKindCo</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcCoercionKind</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkTcCoVarCo</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC51" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkTcFamilyTyConAppCo</span><span class="p">,</span></span>
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52
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isTcReflCo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isTcReflexiveCo</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcCoercionRole</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">unwrapIP</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">wrapIP</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">@@ -141,6 +142,7 @@ mkTcCoherenceRightCo :: Role -> TcType -> TcCoercionN</td>
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141
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<pre style="margin: 0;"> <span id="LC142" class="line" lang="haskell"><span class="n" style="color: #333;">mkTcPhantomCo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcCoercionN</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcCoercionP</span></span>
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<pre style="margin: 0;"> <span id="LC143" class="line" lang="haskell"><span class="n" style="color: #333;">mkTcKindCo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcCoercion</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcCoercionN</span></span>
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<pre style="margin: 0;"> <span id="LC144" class="line" lang="haskell"><span class="n" style="color: #333;">mkTcCoVarCo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CoVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcCoercion</span></span>
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<pre style="margin: 0;">+<span id="LC145" class="line" lang="haskell"><span class="n" style="color: #333;">mkTcFamilyTyConAppCo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcCoercionN</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcCoercionN</span></span>
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<pre style="margin: 0;"> <span id="LC146" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC147" class="line" lang="haskell"><span class="n" style="color: #333;">tcCoercionKind</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcCoercion</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Pair</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span></span>
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<pre style="margin: 0;"> <span id="LC148" class="line" lang="haskell"><span class="n" style="color: #333;">tcCoercionRole</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcCoercion</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Role</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="174" 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="176" 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">@@ -174,6 +176,7 @@ mkTcCoherenceRightCo = mkCoherenceRightCo</td>
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<pre style="margin: 0;"> <span id="LC176" class="line" lang="haskell"><span class="n" style="color: #333;">mkTcPhantomCo</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkPhantomCo</span></span>
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<pre style="margin: 0;"> <span id="LC177" class="line" lang="haskell"><span class="n" style="color: #333;">mkTcKindCo</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkKindCo</span></span>
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<pre style="margin: 0;"> <span id="LC178" class="line" lang="haskell"><span class="n" style="color: #333;">mkTcCoVarCo</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkCoVarCo</span></span>
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<pre style="margin: 0;">+<span id="LC179" class="line" lang="haskell"><span class="n" style="color: #333;">mkTcFamilyTyConAppCo</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkFamilyTyConAppCo</span></span>
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<pre style="margin: 0;"> <span id="LC180" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC181" class="line" lang="haskell"><span class="n" style="color: #333;">tcCoercionKind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">coercionKind</span></span>
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<pre style="margin: 0;"> <span id="LC182" class="line" lang="haskell"><span class="n" style="color: #333;">tcCoercionRole</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">coercionRole</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bfdccac6acce84e15292a454d12f4e0d87ef6f10#9ac3b381002bb0296436d38ebcf91cf6fc5ac9ea"><strong>testsuite/tests/indexed-types/should_compile/T18809.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 GADTs, TypeFamilies #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></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;">T18809</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="c1" style="color: #998; font-style: italic;">-- Ordinary</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">F2</span> <span class="n" style="color: #333;">s</span> <span class="kr" style="font-weight: 600;">where</span></span>
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7
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MkF2</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">{</span> <span class="n" style="color: #333;">foo2</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">F2</span> <span class="n" style="color: #333;">s</span></span>
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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="n" style="color: #333;">bar2</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">F2</span> <span class="n" style="color: #333;">s</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="kt" style="color: #458; font-weight: 600;">F2</span> <span class="n" style="color: #333;">s</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="n" style="color: #333;">bar2</span> <span class="n" style="color: #333;">z</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">z</span> <span class="p">{</span> <span class="n" style="color: #333;">foo2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">y</span> <span class="p">}</span></span>
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11
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- GADT</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">F1</span> <span class="n" style="color: #333;">s</span> <span class="kr" style="font-weight: 600;">where</span></span>
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14
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MkF1</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">{</span> <span class="n" style="color: #333;">foo1</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">F1</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"><span class="n" style="color: #333;">bar1</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">F1</span> <span class="n" style="color: #333;">s</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="kt" style="color: #458; font-weight: 600;">F1</span> <span class="n" style="color: #333;">s</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"><span class="n" style="color: #333;">bar1</span> <span class="n" style="color: #333;">z</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">z</span> <span class="p">{</span> <span class="n" style="color: #333;">foo1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">y</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"></span>
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19
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Orinary data family</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">F3</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">F3</span> <span class="p">(</span><span class="n" style="color: #333;">s</span><span class="p">,</span><span class="n" style="color: #333;">t</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="LC22" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MkF2b</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">{</span> <span class="n" style="color: #333;">foo3</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">F3</span> <span class="p">(</span><span class="n" style="color: #333;">s</span><span class="p">,</span><span class="n" style="color: #333;">t</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"><span class="n" style="color: #333;">bar3</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">F3</span> <span class="p">(</span><span class="n" style="color: #333;">s</span><span class="p">,</span><span class="n" style="color: #333;">t</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 class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">F3</span> <span class="p">(</span><span class="n" style="color: #333;">s</span><span class="p">,</span><span class="n" style="color: #333;">t</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"><span class="n" style="color: #333;">bar3</span> <span class="n" style="color: #333;">z</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">z</span> <span class="p">{</span><span class="n" style="color: #333;">foo3</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">y</span><span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- GADT + data family</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">F4</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">F4</span> <span class="p">(</span><span class="n" style="color: #333;">s</span><span class="p">,</span><span class="n" style="color: #333;">t</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="LC30" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MkF2a</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">{</span> <span class="n" style="color: #333;">foo4</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">F4</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="p">,</span><span class="n" style="color: #333;">t</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"><span class="n" style="color: #333;">bar4</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">F4</span> <span class="p">(</span><span class="n" style="color: #333;">s</span><span class="p">,</span><span class="n" style="color: #333;">t</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 class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">F4</span> <span class="p">(</span><span class="n" style="color: #333;">s</span><span class="p">,</span><span class="n" style="color: #333;">t</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="haskell"><span class="n" style="color: #333;">bar4</span> <span class="n" style="color: #333;">z</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">z</span> <span class="p">{</span> <span class="n" style="color: #333;">foo4</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">y</span><span class="p">}</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bfdccac6acce84e15292a454d12f4e0d87ef6f10#58b9bc2ffb1c7d7b545e6aada524a5d53266e95e"><strong>testsuite/tests/indexed-types/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">@@ -296,3 +296,4 @@ test('T17056', normal, compile, [''])</td>
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<pre style="margin: 0;"> <span id="LC296" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17405</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">multimod_compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">T17405c</span><span class="p">',</span> <span class="p">'</span><span class="s1" style="color: #d14;">-v0</span><span class="p">'])</span></span>
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297
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297
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<pre style="margin: 0;"> <span id="LC297" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17923</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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298
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298
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<pre style="margin: 0;"> <span id="LC298" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18065</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 class="s1" style="color: #d14;">-O</span><span class="p">'])</span></span>
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<pre style="margin: 0;">+<span id="LC299" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18809</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 class="s1" style="color: #d14;">-O</span><span class="p">'])</span></span></pre>
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