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<h3>

Simon Peyton Jones pushed to branch wip/T18855

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/53beedaf2bdd9b9cd3d396b6fe8b92a0e7f69ca2">53beedaf</a></strong>

<div>

<span>by Simon Peyton Jones</span>

<i>at 2020-10-20T11:36:10+01:00</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix two constraint solving problems

This patch fixes two problems in the constraint solver.

* An actual bug #18555: we were floating out a constraint to eagerly,

  and that was ultimately fatal.  It's explained in

  Note [Do not float blocked constraints] in GHC.Core.Constraint.

  This is all very delicate, but it's all going to become irrelevant

  when we stop floating constraints (#17656).

* A major performance infelicity in the flattener.  When flattening

  (ty |> co) we *never* generated Refl, even when there was nothing

  at all to do.  Result: we would gratuitously rewrite the constraint

  to exactly the same thing, wasting work.  Described in #18413, and

  came up again in #18855.

  Solution: exploit the special case by calling the new function

  castCoercionKind1.  See Note [castCoercionKind1] in

  GHC.Core.Coercion

</pre>

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<h4>9 changed files:</h4>

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<a href="#783e5dae6e86931f06700fc088fb7d48c8a07386">

compiler/GHC/Core/Coercion.hs

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<li class="file-stats">

<a href="#91648438362e5a35363d2bb7abb04016dedd7d7e">

compiler/GHC/Core/FamInstEnv.hs

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<a href="#89a2e0e1a3095c7a42b10f2819049908908080e8">

compiler/GHC/Core/Unify.hs

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<li class="file-stats">

<a href="#54436e21ea530a66a8a71bcc01c836f4740b8f02">

compiler/GHC/Tc/Solver.hs

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<a href="#81707f1fe21087531cefd70879aa09c2be5c1d22">

compiler/GHC/Tc/Solver/Flatten.hs

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<a href="#b8c70ad4c2df405c80f995d1f8cb76760a4dcfce">

<span class="new-file">

+

testsuite/tests/polykinds/T18855.hs

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<a href="#37bb83d0a916288b2296ba25cdbbef228eed6484">

testsuite/tests/polykinds/all.T

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<a href="#45bd935a81a5dbfb229f89f8e31a5d1a00e2fa25">

testsuite/tests/typecheck/should_fail/T10709b.stderr

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<a href="#20113928cc39af49e4c89479c9a680c352e8e69f">

testsuite/tests/typecheck/should_fail/T12589.stderr

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<h4>Changes:</h4>

<li id="783e5dae6e86931f06700fc088fb7d48c8a07386">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/53beedaf2bdd9b9cd3d396b6fe8b92a0e7f69ca2#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">@@ -42,7 +42,8 @@ module GHC.Core.Coercion (</td>

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<pre style="margin: 0;"> <span id="LC42" class="line" lang="haskell">        <span class="nf" style="color: #900; font-weight: 600;">mkAxiomInstCo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkProofIrrelCo</span><span class="p">,</span></span>

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<pre style="margin: 0;"> <span id="LC43" 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="LC44" 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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<pre style="margin: 0;">-<span id="LC45" 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="LC45" class="line" lang="haskell">        <span class="nf" style="color: #900; font-weight: 600;">mkKindCo</span><span class="p">,</span></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;">castCoercionKind</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">castCoercionKind1</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">castCoercionKind2</span><span class="p">,</span></span>

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<pre style="margin: 0;"> <span id="LC47" class="line" lang="haskell">        <span class="nf" style="color: #900; font-weight: 600;">mkFamilyTyConAppCo</span><span class="p">,</span></span>

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<pre style="margin: 0;"> <span id="LC48" class="line" lang="haskell"></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;">mkHeteroCoercionType</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">@@ -1513,24 +1514,47 @@ instCoercions g ws</td>

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<pre style="margin: 0;"> <span id="LC1514" class="line" lang="haskell">           <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">piResultTy</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">g_tys</span> <span class="o" style="font-weight: 600;"><*></span> <span class="n" style="color: #333;">w_tys</span><span class="p">,</span> <span class="n" style="color: #333;">g'</span><span class="p">)</span> <span class="p">}</span></span>

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<pre style="margin: 0;"> <span id="LC1515" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC1516" class="line" lang="haskell"><span class="cd">-- | Creates a new coercion with both of its types casted by different casts</span></span>

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<pre style="margin: 0;">-<span id="LC1516" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @castCoercionKind g r t1 t2 h1 h2@, where @g :: t1 ~r t2@,</span></span>

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</td>

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1517

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<pre style="margin: 0;">+<span id="LC1517" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @castCoercionKind<span class="idiff left right">2</span> g r t1 t2 h1 h2@, where @g :: t1 ~r t2@,</span></span>

</pre>

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1517

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<td class="diff-line-num new_line" data-linenumber="1518" 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">

1518

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<pre style="margin: 0;"> <span id="LC1518" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- has type @(t1 |> h1) ~r (t2 |> h2)@.</span></span>

</pre>

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1518

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<td class="diff-line-num new_line" data-linenumber="1519" 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">

1519

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<pre style="margin: 0;"> <span id="LC1519" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @h1@ and @h2@ must be nominal.</span></span>

</pre>

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1519

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<td class="diff-line-num new_line old" data-linenumber="1520" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC1519" class="line" lang="haskell"><span class="n" style="color: #333;">castCoercionKind</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;">Role</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1520" 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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1520

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<pre style="margin: 0;">+<span id="LC1520" class="line" lang="haskell"><span class="n" style="color: #333;">castCoercionKind<span class="idiff left right">2</span></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;">Role</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span></span>

</pre>

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1520

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<td class="diff-line-num new_line" data-linenumber="1521" 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">

1521

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<pre style="margin: 0;"> <span id="LC1521" class="line" lang="haskell">                 <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoercionN</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoercionN</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span></span>

</pre>

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1521

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<td class="diff-line-num new_line old" data-linenumber="1522" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC1521" class="line" lang="haskell"><span class="n" style="color: #333;">castCoercionKind</span> <span class="n" style="color: #333;">g</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">t1</span> <span class="n" style="color: #333;">t2</span> <span class="n" style="color: #333;">h1</span> <span class="n" style="color: #333;">h2</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="1522" 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">

1522

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<pre style="margin: 0;">+<span id="LC1522" class="line" lang="haskell"><span class="n" style="color: #333;">castCoercionKind<span class="idiff left right">2</span></span> <span class="n" style="color: #333;">g</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">t1</span> <span class="n" style="color: #333;">t2</span> <span class="n" style="color: #333;">h1</span> <span class="n" style="color: #333;">h2</span></span>

</pre>

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1522

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<td class="diff-line-num new_line" data-linenumber="1523" 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">

1523

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<pre style="margin: 0;"> <span id="LC1523" 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>

</pre>

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1523

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<td class="diff-line-num new_line" data-linenumber="1524" 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">

1524

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<pre style="margin: 0;"> <span id="LC1524" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="1525" 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">

1525

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<pre style="margin: 0;">+<span id="LC1525" class="line" lang="haskell"><span class="cd">-- | @castCoercionKind1 g r t1 t2 h@ = @coercionKind g r t1 t2 h h@</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="1526" 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">

1526

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<pre style="margin: 0;">+<span id="LC1526" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- That is, it's a specialised form of castCoercionKind, where the two</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1524" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1527" 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">

1527

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<pre style="margin: 0;">+<span id="LC1527" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--          kind coercions are identical</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1524" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1528" 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">

1528

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<pre style="margin: 0;">+<span id="LC1528" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @castCoercionKind1 g r t1 t2 h@, where @g :: t1 ~r t2@,</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1524" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1529" 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">

1529

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<pre style="margin: 0;">+<span id="LC1529" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- has type @(t1 |> h) ~r (t2 |> h)@.</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1524" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1530" 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">

1530

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<pre style="margin: 0;">+<span id="LC1530" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @h@ must be nominal.</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1524" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1531" 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">

1531

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<pre style="margin: 0;">+<span id="LC1531" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [castCoercionKind1]</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="1532" 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">

1532

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<pre style="margin: 0;">+<span id="LC1532" class="line" lang="haskell"><span class="n" style="color: #333;">castCoercionKind1</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;">Role</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1524" 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">

</td>

<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">

1533

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<pre style="margin: 0;">+<span id="LC1533" class="line" lang="haskell">                  <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoercionN</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1524" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1534" 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">

1534

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<pre style="margin: 0;">+<span id="LC1534" class="line" lang="haskell"><span class="n" style="color: #333;">castCoercionKind1</span> <span class="n" style="color: #333;">g</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">t1</span> <span class="n" style="color: #333;">t2</span> <span class="n" style="color: #333;">h</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1524" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1535" 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">

1535

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<pre style="margin: 0;">+<span id="LC1535" 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;">g</span> <span class="kr" style="font-weight: 600;">of</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="1536" 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">

1536

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<pre style="margin: 0;">+<span id="LC1536" class="line" lang="haskell">      <span class="kt" style="color: #458; font-weight: 600;">Refl</span> <span class="n" style="color: #333;">t</span>          <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">refl_shortcut</span> <span class="n" style="color: #333;">t</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1524" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1537" 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">

1537

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<pre style="margin: 0;">+<span id="LC1537" class="line" lang="haskell">      <span class="kt" style="color: #458; font-weight: 600;">GRefl</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">t</span> <span class="kt" style="color: #458; font-weight: 600;">MRefl</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">refl_shortcut</span> <span class="n" style="color: #333;">t</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1524" 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">

</td>

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

1538

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<pre style="margin: 0;">+<span id="LC1538" class="line" lang="haskell">      <span class="kt" style="color: #458; font-weight: 600;">GRefl</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MCo</span> <span class="n" style="color: #333;">kind_co</span><span class="p">)</span></span>

</pre>

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</td>

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

1539

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<pre style="margin: 0;">+<span id="LC1539" class="line" lang="haskell">        <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">GRefl</span> <span class="n" style="color: #333;">r</span> <span class="p">(</span><span class="n" style="color: #333;">mkCastTy</span> <span class="n" style="color: #333;">t1</span> <span class="n" style="color: #333;">h</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1524" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1540" 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">

1540

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<pre style="margin: 0;">+<span id="LC1540" class="line" lang="haskell">                 <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MCo</span> <span class="p">(</span><span class="n" style="color: #333;">mkSymCo</span> <span class="n" style="color: #333;">h</span> <span class="p">`</span><span class="n" style="color: #333;">mkTransCo</span><span class="p">`</span> <span class="n" style="color: #333;">kind_co</span> <span class="p">`</span><span class="n" style="color: #333;">mkTransCo</span><span class="p">`</span> <span class="n" style="color: #333;">h</span><span class="p">))</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1524" 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">

</td>

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

1541

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<pre style="margin: 0;">+<span id="LC1541" class="line" lang="haskell">      <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">castCoercionKind2</span> <span class="n" style="color: #333;">g</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">t1</span> <span class="n" style="color: #333;">t2</span> <span class="n" style="color: #333;">h</span> <span class="n" style="color: #333;">h</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1524" 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">

</td>

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

1542

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<pre style="margin: 0;">+<span id="LC1542" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1524" 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">

</td>

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

1543

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<pre style="margin: 0;">+<span id="LC1543" class="line" lang="haskell">    <span class="n" style="color: #333;">refl_shortcut</span> <span class="n" style="color: #333;">t</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT2</span> <span class="p">(</span><span class="n" style="color: #333;">t1</span> <span class="p">`</span><span class="n" style="color: #333;">eqType</span><span class="p">`</span> <span class="n" style="color: #333;">t2</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">t1</span> <span class="p">`</span><span class="n" style="color: #333;">eqType</span><span class="p">`</span> <span class="n" style="color: #333;">t</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1524" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1544" 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">

1544

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<pre style="margin: 0;">+<span id="LC1544" class="line" lang="haskell">                              <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">t</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">t1</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">t2</span> <span class="p">)</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1524" 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">

</td>

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

1545

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<pre style="margin: 0;">+<span id="LC1545" class="line" lang="haskell">                      <span class="n" style="color: #333;">mkReflCo</span> <span class="n" style="color: #333;">r</span> <span class="p">(</span><span class="n" style="color: #333;">mkCastTy</span> <span class="n" style="color: #333;">t1</span> <span class="n" style="color: #333;">h</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1524" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1546" 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">

1546

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<pre style="margin: 0;">+<span id="LC1546" class="line" lang="haskell"></span>

</pre>

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1524

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<td class="diff-line-num new_line" data-linenumber="1547" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1547

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<pre style="margin: 0;"> <span id="LC1547" class="line" lang="haskell"><span class="cd">-- | Creates a new coercion with both of its types casted by different casts</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1525" 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">

1525

</td>

<td class="diff-line-num new_line" data-linenumber="1548" 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">

1548

</td>

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<pre style="margin: 0;"> <span id="LC1548" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @castCoercionKind g h1 h2@, where @g :: t1 ~r t2@,</span></span>

</pre>

</td>

</tr>

<tr class="line_holder" id="" style="line-height: 1.6;">

<td class="diff-line-num old_line" data-linenumber="1526" 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">

1526

</td>

<td class="diff-line-num new_line" data-linenumber="1549" 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">

1549

</td>

<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC1549" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- has type @(t1 |> h1) ~r (t2 |> h2)@.</span></span>

</pre>

</td>

</tr>

<tr class="line_holder" id="" style="line-height: 1.6;">

<td class="diff-line-num old_line" data-linenumber="1527" 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">

1527

</td>

<td class="diff-line-num new_line" data-linenumber="1550" 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">

1550

</td>

<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC1550" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @h1@ and @h2@ must be nominal.</span></span>

</pre>

</td>

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<tr class="line_holder" id="" style="line-height: 1.6;">

<td class="diff-line-num 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">

1528

</td>

<td class="diff-line-num new_line" data-linenumber="1551" 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">

1551

</td>

<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC1551" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- It calls @coercionKindRole@, so it's quite inefficient (which 'I' stands for)</span></span>

</pre>

</td>

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<tr class="line_holder old" id="" style="line-height: 1.6;">

<td class="diff-line-num old old_line" data-linenumber="1529" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

1529

</td>

<td class="diff-line-num new_line old" data-linenumber="1552" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

</td>

<td class="line_content old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC1529" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Use @castCoercionKind@ instead if @t1@, @t2@, and @r@ are known beforehand.</span></span>

</pre>

</td>

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<tr class="line_holder old" id="" style="line-height: 1.6;">

<td class="diff-line-num old old_line" data-linenumber="1530" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

1530

</td>

<td class="diff-line-num new_line old" data-linenumber="1552" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

</td>

<td class="line_content old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC1530" class="line" lang="haskell"><span class="n" style="color: #333;">castCoercionKindI</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;">CoercionN</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoercionN</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span></span>

</pre>

</td>

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<tr class="line_holder old" id="" style="line-height: 1.6;">

<td class="diff-line-num old old_line" data-linenumber="1531" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

1531

</td>

<td class="diff-line-num new_line old" data-linenumber="1552" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

</td>

<td class="line_content old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC1531" class="line" lang="haskell"><span class="n" style="color: #333;">castCoercionKindI</span> <span class="n" style="color: #333;">g</span> <span class="n" style="color: #333;">h1</span> <span class="n" style="color: #333;">h2</span></span>

</pre>

</td>

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<tr class="line_holder old" id="" style="line-height: 1.6;">

<td class="diff-line-num old old_line" data-linenumber="1532" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

1532

</td>

<td class="diff-line-num new_line old" data-linenumber="1552" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

</td>

<td class="line_content old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC1532" 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>

</pre>

</td>

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<tr class="line_holder old" id="" style="line-height: 1.6;">

<td class="diff-line-num old old_line" data-linenumber="1533" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

1533

</td>

<td class="diff-line-num new_line old" data-linenumber="1552" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

</td>

<td class="line_content old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC1533" 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>

</pre>

</td>

</tr>

<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="1534" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1552" 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">

1552

</td>

<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC1552" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Use @castCoercionKind2@ instead if @t1@, @t2@, and @r@ are known beforehand.</span></span>

</pre>

</td>

</tr>

<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="1534" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1553" 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">

1553

</td>

<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC1553" class="line" lang="haskell"><span class="n" style="color: #333;">castCoercionKind</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;">CoercionN</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoercionN</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span></span>

</pre>

</td>

</tr>

<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="1534" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1554" 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">

1554

</td>

<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC1554" class="line" lang="haskell"><span class="n" style="color: #333;">castCoercionKind</span> <span class="n" style="color: #333;">g</span> <span class="n" style="color: #333;">h1</span> <span class="n" style="color: #333;">h2</span></span>

</pre>

</td>

</tr>

<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="1534" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1555" 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">

1555

</td>

<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC1555" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">castCoercionKind2</span> <span class="n" style="color: #333;">g</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">t1</span> <span class="n" style="color: #333;">t2</span> <span class="n" style="color: #333;">h1</span> <span class="n" style="color: #333;">h2</span></span>

</pre>

</td>

</tr>

<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="1534" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1556" 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">

1556

</td>

<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC1556" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

</td>

</tr>

<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="1534" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1557" 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">

1557

</td>

<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC1557" class="line" lang="haskell">    <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>

</pre>

</td>

</tr>

<tr class="line_holder" id="" style="line-height: 1.6;">

<td class="diff-line-num old_line" data-linenumber="1534" 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">

1534

</td>

<td class="diff-line-num new_line" data-linenumber="1558" 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">

1558

</td>

<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC1558" class="line" lang="haskell"></span>

</pre>

</td>

</tr>

<tr class="line_holder" id="" style="line-height: 1.6;">

<td class="diff-line-num old_line" data-linenumber="1535" 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">

1535

</td>

<td class="diff-line-num new_line" data-linenumber="1559" 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">

1559

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<pre style="margin: 0;"> <span id="LC1559" 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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<pre style="margin: 0;"> <span id="LC1560" 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="LC1616" class="line" lang="haskell">    <span class="p">(</span><span class="n" style="color: #333;">tc</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitTyConApp</span> <span class="p">(</span><span class="n" style="color: #333;">coercionLKind</span> <span class="n" style="color: #333;">g</span><span class="p">)</span></span>

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<pre style="margin: 0;"> <span id="LC1617" class="line" lang="haskell">    <span class="n" style="color: #333;">co_list</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">decomposeCo</span> <span class="p">(</span><span class="n" style="color: #333;">tyConArity</span> <span class="n" style="color: #333;">tc</span><span class="p">)</span> <span class="n" style="color: #333;">g</span> <span class="p">(</span><span class="n" style="color: #333;">tyConRolesRepresentational</span> <span class="n" style="color: #333;">tc</span><span class="p">)</span></span>

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<pre style="margin: 0;"> <span id="LC1618" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC1619" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [castCoercionKind1]</span></span>

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<pre style="margin: 0;">+<span id="LC1620" 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="LC1621" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">castCoercionKind1 deals with the very important special case of castCoercionKind2</span></span>

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<pre style="margin: 0;">+<span id="LC1622" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">where the two kind coercions are identical.  In that case we can exploit the</span></span>

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<pre style="margin: 0;">+<span id="LC1623" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">situation where the main coercion is reflexive, via the special cases for Refl</span></span>

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<pre style="margin: 0;">+<span id="LC1624" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and GRefl.</span></span>

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<pre style="margin: 0;">+<span id="LC1625" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC1626" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This is important when flattening  (ty |> co). We flatten ty, yielding</span></span>

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<pre style="margin: 0;">+<span id="LC1627" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   fco :: ty ~ ty'</span></span>

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<pre style="margin: 0;">+<span id="LC1628" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and now we want a coercion xco between</span></span>

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<pre style="margin: 0;">+<span id="LC1629" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   xco :: (ty |> co) ~ (ty' |> co)</span></span>

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<pre style="margin: 0;">+<span id="LC1630" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">That's exactly what castCoercionKind1 does.  And it's very very common for</span></span>

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<pre style="margin: 0;">+<span id="LC1631" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">fco to be Refl.  In that case we do NOT want to get some terrible composition</span></span>

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<td class="diff-line-num new new_line" data-linenumber="1632" 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">

1632

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<pre style="margin: 0;">+<span id="LC1632" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of mkLeftCoherenceCo and mkRightCoherenceCo, which is what castCoercionKind2</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1595" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1633" 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">

1633

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<pre style="margin: 0;">+<span id="LC1633" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">has to do in its full generality.  See #18413.</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1595" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1634" 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">

1634

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<pre style="margin: 0;">+<span id="LC1634" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1595" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1635" 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">

1635

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<pre style="margin: 0;">+<span id="LC1635" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1595" 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">

1595

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<td class="diff-line-num new_line" data-linenumber="1636" 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">

1636

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<pre style="margin: 0;"> <span id="LC1636" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1596" 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">

1596

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<td class="diff-line-num new_line" data-linenumber="1637" 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">

1637

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<pre style="margin: 0;"> <span id="LC1637" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">%************************************************************************</span></span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="1597" 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">

1597

</td>

<td class="diff-line-num new_line" data-linenumber="1638" 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">

1638

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<pre style="margin: 0;"> <span id="LC1638" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">%*                                                                      *</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1967" 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="2008" 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">@@ -1967,8 +2008,8 @@ ty_co_subst !lc role ty</td>

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<td class="diff-line-num old_line" data-linenumber="1967" 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">

1967

</td>

<td class="diff-line-num new_line" data-linenumber="2008" 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">

2008

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<pre style="margin: 0;"> <span id="LC2008" class="line" lang="haskell">         <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"ty_co_subst: covar is not almost devoid"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">t</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1968" 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">

1968

</td>

<td class="diff-line-num new_line" data-linenumber="2009" 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">

2009

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<pre style="margin: 0;"> <span id="LC2009" class="line" lang="haskell">    <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">ty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LitTy</span> <span class="p">{})</span>     <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;">r</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="p">)</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1969" 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">

1969

</td>

<td class="diff-line-num new_line" data-linenumber="2010" 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">

2010

</td>

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<pre style="margin: 0;"> <span id="LC2010" class="line" lang="haskell">                             <span class="n" style="color: #333;">mkNomReflCo</span> <span class="n" style="color: #333;">ty</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1970" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

1970

</td>

<td class="diff-line-num new_line old" data-linenumber="2011" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

</td>

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<pre style="margin: 0;">-<span id="LC1970" class="line" lang="haskell">    <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">r</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CastTy</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">co</span><span class="p">)</span>    <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">castCoercionKind<span class="idiff left right">I</span></span> <span class="p">(</span><span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">substLeftCo</span> <span class="n" style="color: #333;">lc</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="1971" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

1971

</td>

<td class="diff-line-num new_line old" data-linenumber="2011" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

</td>

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<pre style="margin: 0;">-<span id="LC1971" class="line" lang="haskell">                                                        <span class="idiff left right"> </span><span class="p">(</span><span class="n" style="color: #333;">substRightCo</span> <span class="n" style="color: #333;">lc</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>

</pre>

</td>

</tr>

<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="1972" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="2011" 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">

2011

</td>

<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC2011" class="line" lang="haskell">    <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">r</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CastTy</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">co</span><span class="p">)</span>    <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">castCoercionKind</span> <span class="p">(</span><span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">substLeftCo</span> <span class="n" style="color: #333;">lc</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>

</pre>

</td>

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<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="1972" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="2012" 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">

2012

</td>

<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC2012" class="line" lang="haskell">                                                        <span class="p">(</span><span class="n" style="color: #333;">substRightCo</span> <span class="n" style="color: #333;">lc</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>

</pre>

</td>

</tr>

<tr class="line_holder" id="" style="line-height: 1.6;">

<td class="diff-line-num old_line" data-linenumber="1972" 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">

1972

</td>

<td class="diff-line-num new_line" data-linenumber="2013" 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">

2013

</td>

<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC2013" class="line" lang="haskell">    <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">r</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoercionTy</span> <span class="n" style="color: #333;">co</span><span class="p">)</span>   <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkProofIrrelCo</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">kco</span> <span class="p">(</span><span class="n" style="color: #333;">substLeftCo</span> <span class="n" style="color: #333;">lc</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>

</pre>

</td>

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<tr class="line_holder" id="" style="line-height: 1.6;">

<td class="diff-line-num old_line" data-linenumber="1973" 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">

1973

</td>

<td class="diff-line-num new_line" data-linenumber="2014" 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">

2014

</td>

<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC2014" class="line" lang="haskell">                                                  <span class="p">(</span><span class="n" style="color: #333;">substRightCo</span> <span class="n" style="color: #333;">lc</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>

</pre>

</td>

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<tr class="line_holder" id="" style="line-height: 1.6;">

<td class="diff-line-num old_line" data-linenumber="1974" 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">

1974

</td>

<td class="diff-line-num new_line" data-linenumber="2015" 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">

2015

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<pre style="margin: 0;"> <span id="LC2015" class="line" lang="haskell">      <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">kco</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="p">(</span><span class="n" style="color: #333;">coercionType</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>

</pre>

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<br>

</li>

<li id="91648438362e5a35363d2bb7abb04016dedd7d7e">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/53beedaf2bdd9b9cd3d396b6fe8b92a0e7f69ca2#91648438362e5a35363d2bb7abb04016dedd7d7e"><strong>compiler/GHC/Core/FamInstEnv.hs</strong></a>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1447" 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="1447" 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">@@ -1447,7 +1447,7 @@ normalise_type ty</td>

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1447

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1447

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<pre style="margin: 0;"> <span id="LC1447" class="line" lang="haskell">      <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">nco</span><span class="p">,</span> <span class="n" style="color: #333;">nty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1448" 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">

1448

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<td class="diff-line-num new_line" data-linenumber="1448" 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">

1448

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<pre style="margin: 0;"> <span id="LC1448" class="line" lang="haskell">           <span class="p">;</span> <span class="n" style="color: #333;">lc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getLC</span></span>

</pre>

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1449

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1449

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<pre style="margin: 0;"> <span id="LC1449" class="line" lang="haskell">           <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">co'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substRightCo</span> <span class="n" style="color: #333;">lc</span> <span class="n" style="color: #333;">co</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1450" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

1450

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<pre style="margin: 0;">-<span id="LC1450" class="line" lang="haskell">           <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">castCoercionKind</span> <span class="n" style="color: #333;">nco</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">nty</span> <span class="n" style="color: #333;">co</span> <span class="n" style="color: #333;">co'</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1451" 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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1450

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<pre style="margin: 0;">+<span id="LC1450" class="line" lang="haskell">           <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">castCoercionKind<span class="idiff left right">2</span></span> <span class="n" style="color: #333;">nco</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">nty</span> <span class="n" style="color: #333;">co</span> <span class="n" style="color: #333;">co'</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1451" 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">

1451

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1451

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<pre style="margin: 0;"> <span id="LC1451" class="line" lang="haskell">                    <span class="p">,</span> <span class="n" style="color: #333;">mkCastTy</span> <span class="n" style="color: #333;">nty</span> <span class="n" style="color: #333;">co'</span><span class="p">)</span> <span class="p">}</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1452" 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">

1452

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<td class="diff-line-num new_line" data-linenumber="1452" 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">

1452

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<pre style="margin: 0;"> <span id="LC1452" class="line" lang="haskell">    <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoercionTy</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>

</pre>

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1453

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<td class="diff-line-num new_line" data-linenumber="1453" 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">

1453

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<pre style="margin: 0;"> <span id="LC1453" class="line" lang="haskell">      <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">lc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getLC</span></span>

</pre>

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<br>

</li>

<li id="89a2e0e1a3095c7a42b10f2819049908908080e8">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/53beedaf2bdd9b9cd3d396b6fe8b92a0e7f69ca2#89a2e0e1a3095c7a42b10f2819049908908080e8"><strong>compiler/GHC/Core/Unify.hs</strong></a>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1454" 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="1454" 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">@@ -1454,7 +1454,7 @@ ty_co_match menv subst (TyVarTy tv1) co lkco rkco</td>

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1454

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1454

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<pre style="margin: 0;"> <span id="LC1454" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">any</span> <span class="p">(</span><span class="n" style="color: #333;">inRnEnvR</span> <span class="n" style="color: #333;">rn_env</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">tyCoVarsOfCoList</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1455" 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">

1455

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<td class="diff-line-num new_line" data-linenumber="1455" 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">

1455

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<pre style="margin: 0;"> <span id="LC1455" class="line" lang="haskell">    <span class="kr" style="font-weight: 600;">then</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span>      <span class="c1" style="color: #998; font-style: italic;">-- occurs check failed</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1456" 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">

1456

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<td class="diff-line-num new_line" data-linenumber="1456" 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="LC1456" class="line" lang="haskell">    <span class="kr" style="font-weight: 600;">else</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">extendVarEnv</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tv1'</span> <span class="o" style="font-weight: 600;">$</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1457" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

1457

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<td class="diff-line-num new_line old" data-linenumber="1457" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC1457" class="line" lang="haskell">                <span class="n" style="color: #333;">castCoercionKind<span class="idiff left right">I</span></span> <span class="n" style="color: #333;">co</span> <span class="p">(</span><span class="n" style="color: #333;">mkSymCo</span> <span class="n" style="color: #333;">lkco</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">mkSymCo</span> <span class="n" style="color: #333;">rkco</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1458" 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="LC1457" class="line" lang="haskell">                <span class="n" style="color: #333;">castCoercionKind</span> <span class="n" style="color: #333;">co</span> <span class="p">(</span><span class="n" style="color: #333;">mkSymCo</span> <span class="n" style="color: #333;">lkco</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">mkSymCo</span> <span class="n" style="color: #333;">rkco</span><span class="p">)</span></span>

</pre>

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1458

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<pre style="margin: 0;"> <span id="LC1458" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1459" 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">

1459

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<td class="diff-line-num new_line" data-linenumber="1459" 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">

1459

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<pre style="margin: 0;"> <span id="LC1459" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1460" 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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1460

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<pre style="margin: 0;"> <span id="LC1460" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>

</pre>

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<br>

</li>

<li id="54436e21ea530a66a8a71bcc01c836f4740b8f02">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/53beedaf2bdd9b9cd3d396b6fe8b92a0e7f69ca2#54436e21ea530a66a8a71bcc01c836f4740b8f02"><strong>compiler/GHC/Tc/Solver.hs</strong></a>

<hr>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2542" 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="2542" 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">@@ -2542,6 +2542,9 @@ floatEqualities skols given_ids ev_binds_var no_given_eqs</td>

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<pre style="margin: 0;"> <span id="LC2542" class="line" lang="haskell">    <span class="n" style="color: #333;">is_float_eq_candidate</span> <span class="n" style="color: #333;">ct</span></span>

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<pre style="margin: 0;"> <span id="LC2543" class="line" lang="haskell">      <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">pred</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ctPred</span> <span class="n" style="color: #333;">ct</span></span>

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<pre style="margin: 0;"> <span id="LC2544" class="line" lang="haskell">      <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">EqPred</span> <span class="kt" style="color: #458; font-weight: 600;">NomEq</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">classifyPredType</span> <span class="n" style="color: #333;">pred</span></span>

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<pre style="margin: 0;">+<span id="LC2545" class="line" lang="haskell">      <span class="p">,</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">ct</span> <span class="kr" style="font-weight: 600;">of</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC2546" class="line" lang="haskell">           <span class="kt" style="color: #458; font-weight: 600;">CIrredCan</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">False</span>   <span class="c1" style="color: #998; font-style: italic;">-- See Note [Do not float blocked constraints]</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC2547" class="line" lang="haskell">           <span class="kr" style="font-weight: 600;">_</span>            <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">True</span>    <span class="c1" style="color: #998; font-style: italic;">--   See #18855</span></span>

</pre>

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2545

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<td class="diff-line-num new_line" data-linenumber="2548" 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">

2548

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<pre style="margin: 0;"> <span id="LC2548" class="line" lang="haskell">      <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">float_eq</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">float_eq</span> <span class="n" style="color: #333;">ty2</span> <span class="n" style="color: #333;">ty1</span></span>

</pre>

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<td class="diff-line-num new_line" data-linenumber="2549" 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="LC2549" class="line" lang="haskell">      <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>

</pre>

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<td class="diff-line-num new_line" data-linenumber="2550" 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="LC2550" class="line" lang="haskell">      <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2552" 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="2555" 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">@@ -2552,7 +2555,26 @@ floatEqualities skols given_ids ev_binds_var no_given_eqs</td>

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<pre style="margin: 0;"> <span id="LC2555" class="line" lang="haskell">                   <span class="o" style="font-weight: 600;">&&</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isTyVarTyVar</span> <span class="n" style="color: #333;">tv1</span><span class="p">)</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">isTyVarTy</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span></span>

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<td class="diff-line-num new_line" data-linenumber="2556" 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="LC2556" class="line" lang="haskell">          <span class="kt" style="color: #458; font-weight: 600;">Nothing</span>  <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>

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<pre style="margin: 0;"> <span id="LC2557" class="line" lang="haskell"></span>

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<pre style="margin: 0;">-<span id="LC2555" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Float equalities from under a skolem binding]</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="2558" 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="LC2558" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Do not float blocked constraints]</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="2559" 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="LC2559" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="2560" 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="LC2560" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">As #18855 showed, we must not float an equality that is blocked.</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="2561" 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="LC2561" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="2562" 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="LC2562" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">     forall a[4]. [W] co1: alpha[4] ~ Maybe (a[4] |> bco)</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="2563" 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="LC2563" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">                  [W] co2: alpha[4] ~ Maybe (beta[4] |> bco])</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="2564" 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="LC2564" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">                  [W] bco: kappa[2] ~ Type</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="2565" 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="LC2565" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="2566" 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="LC2566" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Now co1, co2 are blocked by bco.  We will eventually float out bco</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="2567" 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="LC2567" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and solve it at level 2.  But the danger is that we will *also*</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="2568" 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="LC2568" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">float out co2, and that is bad bad bad.  Because we'll promote alpha</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="2569" 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="LC2569" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and beta to level 2, and then fail to unify the promoted beta</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="2570" 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">

2570

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<pre style="margin: 0;">+<span id="LC2570" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with the skolem a[4].</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="2571" 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">

2571

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<pre style="margin: 0;">+<span id="LC2571" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="2556" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="2572" 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="LC2572" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Solution: don't float out blocked equalities. Remember: we only want</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="2573" 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="LC2573" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to float out if we can solve; see Note [Which equalities to float].</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="2556" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="2574" 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">

2574

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<pre style="margin: 0;">+<span id="LC2574" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="2556" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="2575" 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="LC2575" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(Future plan: kill floating altogether.)</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="2556" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="2576" 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="LC2576" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="2556" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="2577" 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="LC2577" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Float equalities from under a skolem binding]</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC2578" 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="LC2579" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Which of the simple equalities can we float out?  Obviously, only</span></span>

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<pre style="margin: 0;"> <span id="LC2580" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">ones that don't mention the skolem-bound variables.  But that is</span></span>

</pre>

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<li id="81707f1fe21087531cefd70879aa09c2be5c1d22">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/53beedaf2bdd9b9cd3d396b6fe8b92a0e7f69ca2#81707f1fe21087531cefd70879aa09c2be5c1d22"><strong>compiler/GHC/Tc/Solver/Flatten.hs</strong></a>

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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1206" 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">@@ -1206,9 +1206,11 @@ flatten_one ty@(ForAllTy {})</td>

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<pre style="margin: 0;"> <span id="LC1206" class="line" lang="haskell"><span class="n" style="color: #333;">flatten_one</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CastTy</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">g</span><span class="p">)</span></span>

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<pre style="margin: 0;"> <span id="LC1207" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">xi</span><span class="p">,</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">flatten_one</span> <span class="n" style="color: #333;">ty</span></span>

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<pre style="margin: 0;"> <span id="LC1208" class="line" lang="haskell">       <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">g'</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span>   <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">flatten_co</span> <span class="n" style="color: #333;">g</span></span>

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<pre style="margin: 0;">-<span id="LC1209" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC1209" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">role</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getRole</span></span>

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<pre style="margin: 0;">-<span id="LC1211" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkCastTy</span> <span class="n" style="color: #333;">xi</span> <span class="n" style="color: #333;">g'</span><span class="p">,</span> <span class="n" style="color: #333;">castCoercionKind</span> <span class="n" style="color: #333;">co</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">xi</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">g'</span> <span class="n" style="color: #333;">g</span><span class="p">)</span> <span class="p">}</span></span>

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<pre style="margin: 0;">+<span id="LC1210" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkCastTy</span> <span class="n" style="color: #333;">xi</span> <span class="n" style="color: #333;">g'</span><span class="p">,</span> <span class="n" style="color: #333;">castCoercionKind1</span> <span class="n" style="color: #333;">co</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">xi</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">g'</span><span class="p">)</span> <span class="p">}</span></span>

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<pre style="margin: 0;">+<span id="LC1211" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- It makes a /big/ difference to call castCoercionKind1 not</span></span>

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<pre style="margin: 0;">+<span id="LC1212" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- the more general castCoercionKind2.</span></span>

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<pre style="margin: 0;">+<span id="LC1213" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- See Note [castCoercionKind1] in GHC.Core.Coercion</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC1214" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;"> <span id="LC1215" class="line" lang="haskell"><span class="n" style="color: #333;">flatten_one</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoercionTy</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">first</span> <span class="n" style="color: #333;">mkCoercionTy</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">flatten_co</span> <span class="n" style="color: #333;">co</span></span>

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1216

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<pre style="margin: 0;"> <span id="LC1216" class="line" lang="haskell"></span>

</pre>

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</li>

<li id="b8c70ad4c2df405c80f995d1f8cb76760a4dcfce">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/53beedaf2bdd9b9cd3d396b6fe8b92a0e7f69ca2#b8c70ad4c2df405c80f995d1f8cb76760a4dcfce"><strong>testsuite/tests/polykinds/T18855.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 DataKinds #-}</span></span>

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

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

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

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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE TypeFamilies #-}</span></span>

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

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

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

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

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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">Apply</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">b</span></span>

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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"></span>

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

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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell">          <span class="n" style="color: #333;">forall</span> <span class="p">(</span><span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">bOne</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">Either</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">bOne</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span></span>

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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell">       <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">bTwo</span><span class="o" style="font-weight: 600;">.</span></span>

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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell">          <span class="n" style="color: #333;">forall</span> <span class="p">(</span><span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Either</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">bTwo</span><span class="p">)</span></span>

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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell">       <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Apply</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">e</span></span>

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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">F</span></span></pre>

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<br>

</li>

<li id="37bb83d0a916288b2296ba25cdbbef228eed6484">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/53beedaf2bdd9b9cd3d396b6fe8b92a0e7f69ca2#37bb83d0a916288b2296ba25cdbbef228eed6484"><strong>testsuite/tests/polykinds/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">@@ -225,3 +225,4 @@ test('T18451', normal, compile_fail, [''])</td>

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<pre style="margin: 0;"> <span id="LC225" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18451a</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>

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<pre style="margin: 0;"> <span id="LC226" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18451b</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>

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<pre style="margin: 0;"> <span id="LC227" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18522-ppr</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">ghci_script</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">T18522-ppr.script</span><span class="p">'])</span></span>

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<pre style="margin: 0;">+<span id="LC228" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18855</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span></pre>

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<li id="45bd935a81a5dbfb229f89f8e31a5d1a00e2fa25">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/53beedaf2bdd9b9cd3d396b6fe8b92a0e7f69ca2#45bd935a81a5dbfb229f89f8e31a5d1a00e2fa25"><strong>testsuite/tests/typecheck/should_fail/T10709b.stderr</strong></a>

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<pre style="margin: 0;"> <span id="LC11" class="line" lang="plaintext">          x4 = (replicateM 2 . mask) (\ _ -> return ())</span>

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

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<pre style="margin: 0;"> <span id="LC13" class="line" lang="plaintext">T10709b.hs:7:22: error:</span>

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<pre style="margin: 0;">-<span id="LC14" class="line" lang="plaintext">    • Couldn't match type ‘t0’ with ‘forall a<span class="idiff left right">. IO a -> IO a</span>’</span>

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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext">    • Couldn't match type ‘t0’ with ‘forall a<span class="idiff left right">1. IO a1 -> IO a1</span>’</span>

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<pre style="margin: 0;"> <span id="LC15" class="line" lang="plaintext">      Expected: (t0 -> IO a) -> IO a</span>

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<pre style="margin: 0;"> <span id="LC16" class="line" lang="plaintext">        Actual: ((forall a1. IO a1 -> IO a1) -> IO a) -> IO a</span>

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<pre style="margin: 0;"> <span id="LC17" class="line" lang="plaintext">      Cannot instantiate unification variable ‘t0’</span>

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<pre style="margin: 0;">-<span id="LC18" class="line" lang="plaintext">      with a type involving polytypes: forall a<span class="idiff left right">. IO a -> IO a</span></span>

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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext">      with a type involving polytypes: forall a<span class="idiff left right">1. IO a1 -> IO a1</span></span>

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<pre style="margin: 0;"> <span id="LC19" class="line" lang="plaintext">    • In the second argument of ‘(.)’, namely ‘mask’</span>

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<pre style="margin: 0;"> <span id="LC20" class="line" lang="plaintext">      In the expression: (replicateM 2 . mask) (\ x -> undefined x)</span>

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<pre style="margin: 0;"> <span id="LC21" class="line" lang="plaintext">      In an equation for ‘x5’:</span>

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<pre style="margin: 0;"> <span id="LC22" class="line" lang="plaintext">          x5 = (replicateM 2 . mask) (\ x -> undefined x)</span>

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<pre style="margin: 0;"> <span id="LC23" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC24" class="line" lang="plaintext">T10709b.hs:8:22: error:</span>

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<pre style="margin: 0;">-<span id="LC25" class="line" lang="plaintext">    • Couldn't match type ‘p0’ with ‘forall a<span class="idiff left right">. IO a -> IO a</span>’</span>

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<pre style="margin: 0;">+<span id="LC25" class="line" lang="plaintext">    • Couldn't match type ‘p0’ with ‘forall a<span class="idiff left right">1. IO a1 -> IO a1</span>’</span>

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<pre style="margin: 0;"> <span id="LC26" class="line" lang="plaintext">      Expected: (p0 -> IO a) -> IO a</span>

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<pre style="margin: 0;"> <span id="LC27" class="line" lang="plaintext">        Actual: ((forall a1. IO a1 -> IO a1) -> IO a) -> IO a</span>

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<pre style="margin: 0;"> <span id="LC28" class="line" lang="plaintext">      Cannot instantiate unification variable ‘p0’</span>

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<pre style="margin: 0;">-<span id="LC29" class="line" lang="plaintext">      with a type involving polytypes: forall a<span class="idiff left right">. IO a -> IO a</span></span>

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<pre style="margin: 0;">+<span id="LC29" class="line" lang="plaintext">      with a type involving polytypes: forall a<span class="idiff left right">1. IO a1 -> IO a1</span></span>

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<pre style="margin: 0;"> <span id="LC30" class="line" lang="plaintext">    • In the second argument of ‘(.)’, namely ‘mask’</span>

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<pre style="margin: 0;"> <span id="LC31" class="line" lang="plaintext">      In the expression: (replicateM 2 . mask) (id (\ _ -> undefined))</span>

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<pre style="margin: 0;"> <span id="LC32" class="line" lang="plaintext">      In an equation for ‘x6’:</span>

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<pre style="margin: 0;"> <span id="LC33" class="line" lang="plaintext">          x6 = (replicateM 2 . mask) (id (\ _ -> undefined))</span>

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<pre style="margin: 0;"> <span id="LC34" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC35" class="line" lang="plaintext">T10709b.hs:9:22: error:</span>

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<pre style="margin: 0;">-<span id="LC36" class="line" lang="plaintext">    • Couldn't match type ‘b0’ with ‘forall a<span class="idiff left right">. IO a -> IO a</span>’</span>

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<pre style="margin: 0;">+<span id="LC36" class="line" lang="plaintext">    • Couldn't match type ‘b0’ with ‘forall a<span class="idiff left right">1. IO a1 -> IO a1</span>’</span>

</pre>

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<pre style="margin: 0;"> <span id="LC37" class="line" lang="plaintext">      Expected: (b0 -> IO a) -> IO a</span>

</pre>

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<pre style="margin: 0;"> <span id="LC38" class="line" lang="plaintext">        Actual: ((forall a1. IO a1 -> IO a1) -> IO a) -> IO a</span>

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<pre style="margin: 0;"> <span id="LC39" class="line" lang="plaintext">      Cannot instantiate unification variable ‘b0’</span>

</pre>

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<pre style="margin: 0;">-<span id="LC40" class="line" lang="plaintext">      with a type involving polytypes: forall a<span class="idiff left right">. IO a -> IO a</span></span>

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<pre style="margin: 0;">+<span id="LC40" class="line" lang="plaintext">      with a type involving polytypes: forall a<span class="idiff left right">1. IO a1 -> IO a1</span></span>

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<pre style="margin: 0;"> <span id="LC41" class="line" lang="plaintext">    • In the second argument of ‘(.)’, namely ‘mask’</span>

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<pre style="margin: 0;"> <span id="LC42" class="line" lang="plaintext">      In the expression: (replicateM 2 . mask) (const undefined)</span>

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<pre style="margin: 0;"> <span id="LC43" class="line" lang="plaintext">      In an equation for ‘x7’:</span>

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<pre style="margin: 0;"> <span id="LC44" class="line" lang="plaintext">          x7 = (replicateM 2 . mask) (const undefined)</span>

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<pre style="margin: 0;"> <span id="LC45" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC46" class="line" lang="plaintext">T10709b.hs:10:22: error:</span>

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<pre style="margin: 0;">-<span id="LC47" class="line" lang="plaintext">    • Couldn't match type ‘a0’ with ‘forall a<span class="idiff left right">. IO a -> IO a</span>’</span>

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<pre style="margin: 0;">+<span id="LC47" class="line" lang="plaintext">    • Couldn't match type ‘a0’ with ‘forall a<span class="idiff left right">1. IO a1 -> IO a1</span>’</span>

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<pre style="margin: 0;"> <span id="LC48" class="line" lang="plaintext">      Expected: (a0 -> IO a) -> IO a</span>

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<pre style="margin: 0;"> <span id="LC49" class="line" lang="plaintext">        Actual: ((forall a1. IO a1 -> IO a1) -> IO a) -> IO a</span>

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<pre style="margin: 0;"> <span id="LC50" class="line" lang="plaintext">      Cannot instantiate unification variable ‘a0’</span>

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<pre style="margin: 0;">-<span id="LC51" class="line" lang="plaintext">      with a type involving polytypes: forall a<span class="idiff left right">. IO a -> IO a</span></span>

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<pre style="margin: 0;">+<span id="LC51" class="line" lang="plaintext">      with a type involving polytypes: forall a<span class="idiff left right">1. IO a1 -> IO a1</span></span>

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<pre style="margin: 0;"> <span id="LC52" class="line" lang="plaintext">    • In the second argument of ‘(.)’, namely ‘mask’</span>

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<pre style="margin: 0;"> <span id="LC53" class="line" lang="plaintext">      In the expression:</span>

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<pre style="margin: 0;"> <span id="LC54" class="line" lang="plaintext">        (replicateM 2 . mask) ((\ x -> undefined x) :: a -> b)</span>

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<br>

</li>

<li id="20113928cc39af49e4c89479c9a680c352e8e69f">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/53beedaf2bdd9b9cd3d396b6fe8b92a0e7f69ca2#20113928cc39af49e4c89479c9a680c352e8e69f"><strong>testsuite/tests/typecheck/should_fail/T12589.stderr</strong></a>

<hr>

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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">T12589.hs:13:3: error: Variable not in scope: (&) :: t0 -> t1 -> t</span></pre>

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3

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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"></span>

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4

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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext">T12589.hs:13:5: error:</span>

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5

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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext">    • Couldn't match expected type ‘t1’</span>

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6

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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext">                  with actual type ‘(forall a. Bounded a => f0 a) -> h0 f0 xs0’</span>

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7

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<pre style="margin: 0;">-<span id="LC7" class="line" lang="plaintext">      Cannot instantiate unification variable ‘t1’</span>

</pre>

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8

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<pre style="margin: 0;">-<span id="LC8" class="line" lang="plaintext">      with a type involving polytypes:</span>

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9

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<pre style="margin: 0;">-<span id="LC9" class="line" lang="plaintext">        (forall a. Bounded a => f0 a) -> h0 f0 xs0</span>

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10

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<pre style="margin: 0;">-<span id="LC10" class="line" lang="plaintext">    • In the second argument of ‘(&)’, namely ‘hcpure (Proxy @Bounded)’</span>

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11

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<pre style="margin: 0;">-<span id="LC11" class="line" lang="plaintext">      In the expression: minBound & hcpure (Proxy @Bounded)</span>

</pre>

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12

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<pre style="margin: 0;">-<span id="LC12" class="line" lang="plaintext">      In an equation for ‘a’: a = minBound & hcpure (Proxy @Bounded)</span></pre>

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