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<h3>
Simon Peyton Jones pushed to branch wip/T18451
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/911e0c4eafeaddf0eb9e42391b71e14f78fc8e30">911e0c4e</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-20T08:47:51+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Care with occCheckExpand in kind of occurrences
Issue #18451 showed that we could get an infinite type, through
over-use of occCheckExpand in the kind of an /occurrence/ of a
type variable.
See Note [Occurrence checking: look inside kinds] in GHC.Core.Type
This patch fixes the problem by making occCheckExpand less eager
to expand synonyms in kinds.
It also improves pretty printing of kinds, by *not* suppressing
the kind on a tyvar-binder like
(a :: Const Type b)
where type Const p q = p. Even though the kind of 'a' is Type,
we don't want to suppress the kind ascription. Example: the
error message for polykinds/T18451{a,b}. See GHC.Core.TyCo.Ppr
Note [Suppressing * kinds].
</pre>
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<h4>10 changed files:</h4>
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<li class="file-stats">
<a href="#379343fa560df0c7451aa5a1dd4f074dd37924d0">
compiler/GHC/Core/TyCo/Ppr.hs
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<li class="file-stats">
<a href="#84c9d3ba34173297e7d7747e02caa2e004b164fc">
compiler/GHC/Core/Type.hs
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<li class="file-stats">
<a href="#74295edeac870ee7f2f3484ebaffab5c948b735a">
compiler/GHC/Tc/Utils/Unify.hs
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<a href="#ab33108b2030a78f4b19ab70b51200a5f2c280e1">
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testsuite/tests/polykinds/T18451.hs
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<li class="file-stats">
<a href="#fe41287b9864f781d6d727f00089c261eb78d60b">
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testsuite/tests/polykinds/T18451.stderr
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<a href="#dd5304f6d30e3a7c90a3af1ef0bd8e1740500d74">
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testsuite/tests/polykinds/T18451a.hs
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testsuite/tests/polykinds/T18451a.stderr
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<li class="file-stats">
<a href="#1c8a99b4cc5649d9ddeaf15a86c43e6d7ad964ec">
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testsuite/tests/polykinds/T18451b.hs
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testsuite/tests/polykinds/T18451b.stderr
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<li class="file-stats">
<a href="#37bb83d0a916288b2296ba25cdbbef228eed6484">
testsuite/tests/polykinds/all.T
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<h4>Changes:</h4>
<li id="379343fa560df0c7451aa5a1dd4f074dd37924d0">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/911e0c4eafeaddf0eb9e42391b71e14f78fc8e30#379343fa560df0c7451aa5a1dd4f074dd37924d0"><strong>compiler/GHC/Core/TyCo/Ppr.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">@@ -34,10 +34,9 @@ import {-# SOURCE #-} GHC.CoreToIface</td>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">toIfaceTyCon</span><span class="p">,</span> <span class="n" style="color: #333;">toIfaceTcArgs</span><span class="p">,</span> <span class="n" style="color: #333;">toIfaceCoercionX</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">{-#</span> <span class="nn" style="color: #555;">SOURCE</span> <span class="o" style="font-weight: 600;">#-</span><span class="p">}</span> <span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Core</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">DataCon</span></span>
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<pre style="margin: 0;">-<span id="LC37" class="line" lang="haskell"> <span class="p">(</span> <span class="n" style="color: #333;">dataConFullSig</span> <span class="p">,</span> <span class="n" style="color: #333;">dataConUserTyVarBinders</span></span>
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<pre style="margin: 0;">-<span id="LC38" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">DataCon</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="haskell"> <span class="p">(</span> <span class="n" style="color: #333;">dataConFullSig</span> <span class="p">,</span> <span class="n" style="color: #333;">dataConUserTyVarBinders</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">DataCon</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC40" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Type</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left right">i</span>sLiftedTypeKind</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">One</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">Many</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Type</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left right">pickyI</span>sLiftedTypeKind</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">One</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">Many</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCon</span></span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCo.Rep</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="192" 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="191" 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">@@ -192,11 +191,35 @@ pprTyVar :: TyVar -> SDoc</td>
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<pre style="margin: 0;"> <span id="LC191" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- pprIfaceTvBndr is minimal, and the loss of uniques etc in</span></span>
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<pre style="margin: 0;"> <span id="LC192" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- debug printing is disastrous</span></span>
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<pre style="margin: 0;"> <span id="LC193" class="line" lang="haskell"><span class="n" style="color: #333;">pprTyVar</span> <span class="n" style="color: #333;">tv</span></span>
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<pre style="margin: 0;">-<span id="LC195" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;"><span class="idiff left">isLiftedTypeKind</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">kind</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">tv</span></span></span>
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<pre style="margin: 0;">-<span id="LC196" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">parens</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">kind</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC194" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;"><span class="idiff left">pickyIsLiftedTypeKind</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">kind</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tv</span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- See Note [Suppressing * kinds]</span></span></span>
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<pre style="margin: 0;">+<span id="LC195" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">parens</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">kind</span><span class="p">)</span></span>
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197
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<pre style="margin: 0;"> <span id="LC196" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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198
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<pre style="margin: 0;"> <span id="LC197" class="line" lang="haskell"> <span class="n" style="color: #333;">kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyVarKind</span> <span class="n" style="color: #333;">tv</span></span>
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198
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<pre style="margin: 0;"> <span id="LC198" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC199" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Suppressing * kinds]</span></span>
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200
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<pre style="margin: 0;">+<span id="LC200" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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201
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<pre style="margin: 0;">+<span id="LC201" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Generally we want to print</span></span>
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202
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<pre style="margin: 0;">+<span id="LC202" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> forall a. a->a</span></span>
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203
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<pre style="margin: 0;">+<span id="LC203" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">not forall (a::*). a->a</span></span>
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<pre style="margin: 0;">+<span id="LC204" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">or forall (a::Type). a->a</span></span>
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<pre style="margin: 0;">+<span id="LC205" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">That is, for brevity we suppress a kind ascription of '*' (or Type).</span></span>
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206
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<pre style="margin: 0;">+<span id="LC206" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC207" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But what if the kind is (Const Type x)?</span></span>
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<pre style="margin: 0;">+<span id="LC208" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type Cons p q = p</span></span>
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209
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<pre style="margin: 0;">+<span id="LC209" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC210" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Then (Const Type x) is just a long way of saying Type. But it may be</span></span>
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211
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<pre style="margin: 0;">+<span id="LC211" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">jolly confusing to suppress the 'x'. Suppose we have (polykinds/T18451a)</span></span>
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212
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<pre style="margin: 0;">+<span id="LC212" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> foo :: forall a b (c :: Const Type b). Proxy '[a, c]</span></span>
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213
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<pre style="margin: 0;">+<span id="LC213" class="line" lang="haskell"></span>
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214
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<pre style="margin: 0;">+<span id="LC214" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Then this error message</span></span>
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<pre style="margin: 0;">+<span id="LC215" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> • These kind and type variables: a b (c :: Const Type b)</span></span>
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<pre style="margin: 0;">+<span id="LC216" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> are out of dependency order. Perhaps try this ordering:</span></span>
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<pre style="margin: 0;">+<span id="LC217" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (b :: k) (a :: Const (*) b) (c :: Const (*) b)</span></span>
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<pre style="margin: 0;">+<span id="LC218" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">would be much less helpful if we suppressed the kind ascription on 'a'.</span></span>
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<pre style="margin: 0;">+<span id="LC219" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC220" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Hence the use of pickyIsLiftedTypeKind.</span></span>
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<pre style="margin: 0;">+<span id="LC221" 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="LC222" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC223" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-----------------</span></span>
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<pre style="margin: 0;"> <span id="LC224" class="line" lang="haskell"><span class="n" style="color: #333;">debugPprType</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;">SDoc</span></span>
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<pre style="margin: 0;"> <span id="LC225" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ^ debugPprType is a simple pretty printer that prints a type</span></span>
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<li id="84c9d3ba34173297e7d7747e02caa2e004b164fc">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/911e0c4eafeaddf0eb9e42391b71e14f78fc8e30#84c9d3ba34173297e7d7747e02caa2e004b164fc"><strong>compiler/GHC/Core/Type.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">@@ -122,7 +122,7 @@ module GHC.Core.Type (</td>
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<pre style="margin: 0;"> <span id="LC122" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC123" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- *** Levity and boxity</span></span>
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<pre style="margin: 0;"> <span id="LC124" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isLiftedType_maybe</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC125" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isLiftedTypeKind</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isUnliftedTypeKind</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC125" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isLiftedTypeKind</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isUnliftedTypeKind</span><span class="p">,</span><span class="idiff left"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">pickyIsLiftedTypeKind</span></span><span class="p"><span class="idiff right">,</span></span></span>
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<pre style="margin: 0;"> <span id="LC126" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isLiftedRuntimeRep</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isUnliftedRuntimeRep</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC127" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isUnliftedType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mightBeUnliftedType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isUnboxedTupleType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isUnboxedSumType</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC128" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isAlgType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isDataFamilyAppType</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">@@ -556,6 +556,22 @@ isLiftedTypeKind kind</td>
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<pre style="margin: 0;"> <span id="LC556" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">rep</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">isLiftedRuntimeRep</span> <span class="n" style="color: #333;">rep</span></span>
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<pre style="margin: 0;"> <span id="LC557" 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="LC558" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC559" class="line" lang="haskell"><span class="n" style="color: #333;">pickyIsLiftedTypeKind</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Kind</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC560" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Checks whether the kind is literally</span></span>
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<pre style="margin: 0;">+<span id="LC561" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- TYPE LiftedRep</span></span>
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<pre style="margin: 0;">+<span id="LC562" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- or Type</span></span>
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<pre style="margin: 0;">+<span id="LC563" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- without expanding type synonyms or anything</span></span>
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<pre style="margin: 0;">+<span id="LC564" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Used only when deciding whether to suppress the ":: *" in</span></span>
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<pre style="margin: 0;">+<span id="LC565" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (a :: *) when printing kinded type variables</span></span>
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<pre style="margin: 0;">+<span id="LC566" class="line" lang="haskell"><span class="n" style="color: #333;">pickyIsLiftedTypeKind</span> <span class="n" style="color: #333;">kind</span></span>
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<pre style="margin: 0;">+<span id="LC567" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">TyConApp</span> <span class="n" style="color: #333;">tc</span> <span class="p">[</span><span class="n" style="color: #333;">arg</span><span class="p">]</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">kind</span></span>
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<pre style="margin: 0;">+<span id="LC568" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tc</span> <span class="p">`</span><span class="n" style="color: #333;">hasKey</span><span class="p">`</span> <span class="n" style="color: #333;">tYPETyConKey</span></span>
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<pre style="margin: 0;">+<span id="LC569" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TyConApp</span> <span class="n" style="color: #333;">rr_tc</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">arg</span></span>
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<pre style="margin: 0;">+<span id="LC570" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">rr_tc</span> <span class="p">`</span><span class="n" style="color: #333;">hasKey</span><span class="p">`</span> <span class="n" style="color: #333;">liftedRepDataConKey</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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571
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<pre style="margin: 0;">+<span id="LC571" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">TyConApp</span> <span class="n" style="color: #333;">tc</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">kind</span></span>
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572
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<pre style="margin: 0;">+<span id="LC572" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tc</span> <span class="p">`</span><span class="n" style="color: #333;">hasKey</span><span class="p">`</span> <span class="n" style="color: #333;">liftedTypeKindTyConKey</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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573
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<pre style="margin: 0;">+<span id="LC573" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">+<span id="LC574" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC575" class="line" lang="haskell"><span class="n" style="color: #333;">isLiftedRuntimeRep</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;">Bool</span></span>
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<pre style="margin: 0;"> <span id="LC576" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- isLiftedRuntimeRep is true of LiftedRep :: RuntimeRep</span></span>
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577
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<pre style="margin: 0;"> <span id="LC577" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- False of type variables (a :: RuntimeRep)</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">@@ -2633,6 +2649,46 @@ prefer doing inner expansions first. For example,</td>
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2633
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2649
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<pre style="margin: 0;"> <span id="LC2649" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We have</span></span>
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<pre style="margin: 0;"> <span id="LC2650" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> occCheckExpand b (F (G b)) = Just (F Char)</span></span>
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2635
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2651
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<pre style="margin: 0;"> <span id="LC2651" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">even though we could also expand F to get rid of b.</span></span>
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2652
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<pre style="margin: 0;">+<span id="LC2652" class="line" lang="haskell"></span>
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2653
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<pre style="margin: 0;">+<span id="LC2653" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Occurrence checking: look inside kinds]</span></span>
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2654
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<pre style="margin: 0;">+<span id="LC2654" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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2655
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<pre style="margin: 0;">+<span id="LC2655" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Suppose we are considering unifying</span></span>
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2656
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<pre style="margin: 0;">+<span id="LC2656" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (alpha :: *) ~ Int -> (beta :: alpha -> alpha)</span></span>
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2657
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<pre style="margin: 0;">+<span id="LC2657" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This may be an error (what is that alpha doing inside beta's kind?),</span></span>
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2658
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<pre style="margin: 0;">+<span id="LC2658" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">but we must not make the mistake of actually unifying or we'll</span></span>
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2659
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<pre style="margin: 0;">+<span id="LC2659" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">build an infinite data structure. So when looking for occurrences</span></span>
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2660
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<pre style="margin: 0;">+<span id="LC2660" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of alpha in the rhs, we must look in the kinds of type variables</span></span>
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2661
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<pre style="margin: 0;">+<span id="LC2661" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that occur there.</span></span>
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2662
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<pre style="margin: 0;">+<span id="LC2662" class="line" lang="haskell"></span>
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2663
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<pre style="margin: 0;">+<span id="LC2663" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">occCheckExpand tries to expand type synonyms to remove</span></span>
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2664
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<pre style="margin: 0;">+<span id="LC2664" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">unnecessary occurrences of a variable, and thereby get past an</span></span>
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2665
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<pre style="margin: 0;">+<span id="LC2665" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">occurs-check failure. This is good; but</span></span>
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2666
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<pre style="margin: 0;">+<span id="LC2666" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> we can't do it in the /kind/ of a variable /occurrence/</span></span>
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2667
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<pre style="margin: 0;">+<span id="LC2667" class="line" lang="haskell"></span>
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2668
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<pre style="margin: 0;">+<span id="LC2668" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For example #18451 built an infinite type:</span></span>
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2669
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<pre style="margin: 0;">+<span id="LC2669" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type Const a b = a</span></span>
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2670
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<pre style="margin: 0;">+<span id="LC2670" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data SameKind :: k -> k -> Type</span></span>
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2671
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<pre style="margin: 0;">+<span id="LC2671" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type T (k :: Const Type a) = forall (b :: k). SameKind a b</span></span>
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2672
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<pre style="margin: 0;">+<span id="LC2672" class="line" lang="haskell"></span>
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2673
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<pre style="margin: 0;">+<span id="LC2673" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We have</span></span>
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2674
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<pre style="margin: 0;">+<span id="LC2674" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> b :: k</span></span>
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2675
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<pre style="margin: 0;">+<span id="LC2675" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> k :: Const Type a</span></span>
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2676
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<pre style="margin: 0;">+<span id="LC2676" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a :: k (must be same as b)</span></span>
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2677
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<pre style="margin: 0;">+<span id="LC2677" class="line" lang="haskell"></span>
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2678
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<pre style="margin: 0;">+<span id="LC2678" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So if we aren't careful, a's kind mentions a, which is bad.</span></span>
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2679
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<pre style="margin: 0;">+<span id="LC2679" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">And expanding an /occurrence/ of 'a' doesn't help, because the</span></span>
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2680
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<pre style="margin: 0;">+<span id="LC2680" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">/binding site/ is the master copy and all the occurrences should</span></span>
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2681
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<pre style="margin: 0;">+<span id="LC2681" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">match it.</span></span>
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2682
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<pre style="margin: 0;">+<span id="LC2682" class="line" lang="haskell"></span>
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2683
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<pre style="margin: 0;">+<span id="LC2683" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here's a related example:</span></span>
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2684
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<pre style="margin: 0;">+<span id="LC2684" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: forall a b (c :: Const Type b). Proxy '[a, c]</span></span>
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2685
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<pre style="margin: 0;">+<span id="LC2685" class="line" lang="haskell"></span>
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2686
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<pre style="margin: 0;">+<span id="LC2686" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The list means that 'a' gets the same kind as 'c'; but that</span></span>
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2687
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<pre style="margin: 0;">+<span id="LC2687" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">kind mentions 'b', so the binders are out of order.</span></span>
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2688
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<pre style="margin: 0;">+<span id="LC2688" class="line" lang="haskell"></span>
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2689
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<pre style="margin: 0;">+<span id="LC2689" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Bottom line: in occCheckExpand, do not expand inside the kinds</span></span>
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2690
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<pre style="margin: 0;">+<span id="LC2690" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of occurrences. See bad_var_occ in occCheckExpand. And</span></span>
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2691
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<pre style="margin: 0;">+<span id="LC2691" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">see #18451 for more debate.</span></span>
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2636
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2692
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<pre style="margin: 0;"> <span id="LC2692" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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2637
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2693
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<pre style="margin: 0;"> <span id="LC2693" class="line" lang="haskell"></span>
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2638
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2694
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<pre style="margin: 0;"> <span id="LC2694" class="line" lang="haskell"><span class="n" style="color: #333;">occCheckExpand</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Var</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2653" 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="2709" 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">@@ -2653,11 +2709,10 @@ occCheckExpand vs_to_avoid ty</td>
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2653
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2709
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<pre style="margin: 0;"> <span id="LC2709" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The VarSet is the set of variables we are trying to avoid</span></span>
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2654
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2710
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<pre style="margin: 0;"> <span id="LC2710" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The VarEnv carries mappings necessary</span></span>
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2655
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2711
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<pre style="margin: 0;"> <span id="LC2711" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- because of kind expansion</span></span>
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2656
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<td class="diff-line-num new_line old" data-linenumber="2712" 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="LC2656" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">cxt</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="n" style="color: #333;">as</span><span class="p">,</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyVarTy</span> <span class="n" style="color: #333;">tv'</span><span class="p">)</span></span>
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2657
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<td class="diff-line-num new_line old" data-linenumber="2712" 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="LC2657" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">tv'</span> <span class="p">`</span><span class="n" style="color: #333;">elemVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">as</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<td class="diff-line-num old old_line" data-linenumber="2658" 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">
2658
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<td class="diff-line-num new_line old" data-linenumber="2712" 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="LC2658" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">tv''</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupVarEnv</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">tv'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">tv''</span><span class="p">)</span></span>
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<td class="diff-line-num old old_line" data-linenumber="2659" 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">
2659
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<td class="diff-line-num new_line old" data-linenumber="2712" 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="LC2659" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">tv''</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">go_var</span> <span class="n" style="color: #333;">cxt</span> <span class="n" style="color: #333;">tv'</span></span>
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2660
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<td class="diff-line-num new_line old" data-linenumber="2712" 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="LC2660" 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;">mkTyVarTy</span> <span class="n" style="color: #333;">tv''</span><span class="p">)</span> <span class="p">}</span></span>
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<td class="diff-line-num new old_line" data-linenumber="2661" 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="2712" 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">
2712
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<pre style="margin: 0;">+<span id="LC2712" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="n" style="color: #333;">as</span><span class="p">,</span> <span class="n" style="color: #333;">env</span><span class="p">)</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;">TyVarTy</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span></span>
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<td class="diff-line-num new old_line" data-linenumber="2661" 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="2713" 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">
2713
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<pre style="margin: 0;">+<span id="LC2713" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">tv'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupVarEnv</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">tv'</span><span class="p">)</span></span>
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<td class="diff-line-num new old_line" data-linenumber="2661" 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="2714" 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">
2714
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<pre style="margin: 0;">+<span id="LC2714" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">bad_var_occ</span> <span class="n" style="color: #333;">as</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2715" 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">
2715
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<pre style="margin: 0;">+<span id="LC2715" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">ty</span></span>
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2661
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<td class="diff-line-num new_line" data-linenumber="2716" 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">
2716
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<pre style="margin: 0;"> <span id="LC2716" class="line" lang="haskell"></span>
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<td class="diff-line-num old_line" data-linenumber="2662" 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">
2662
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<td class="diff-line-num new_line" data-linenumber="2717" 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">
2717
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<pre style="margin: 0;"> <span id="LC2717" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kr" style="font-weight: 600;">_</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="n" style="color: #333;">return</span> <span class="n" style="color: #333;">ty</span></span>
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<td class="diff-line-num old_line" data-linenumber="2663" 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">
2663
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<td class="diff-line-num new_line" data-linenumber="2718" 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">
2718
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<pre style="margin: 0;"> <span id="LC2718" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">cxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AppTy</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span> <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;">ty1'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">cxt</span> <span class="n" style="color: #333;">ty1</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2670" 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="2725" 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">@@ -2670,7 +2725,7 @@ occCheckExpand vs_to_avoid ty</td>
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2670
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<td class="diff-line-num new_line" data-linenumber="2725" 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">
2725
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<pre style="margin: 0;"> <span id="LC2725" 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;">ty</span> <span class="p">{</span> <span class="n" style="color: #333;">ft_mult</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">w'</span><span class="p">,</span> <span class="n" style="color: #333;">ft_arg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty1'</span><span class="p">,</span> <span class="n" style="color: #333;">ft_res</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty2'</span> <span class="p">})</span> <span class="p">}</span></span>
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<td class="diff-line-num old_line" data-linenumber="2671" 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">
2671
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<td class="diff-line-num new_line" data-linenumber="2726" 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">
2726
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<pre style="margin: 0;"> <span id="LC2726" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">cxt</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="n" style="color: #333;">as</span><span class="p">,</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForAllTy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Bndr</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">vis</span><span class="p">)</span> <span class="n" style="color: #333;">body_ty</span><span class="p">)</span></span>
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2672
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<td class="diff-line-num new_line" data-linenumber="2727" 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">
2727
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<pre style="margin: 0;"> <span id="LC2727" 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;">ki'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">cxt</span> <span class="p">(</span><span class="n" style="color: #333;">varType</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span></span>
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<td class="diff-line-num old old_line" data-linenumber="2673" 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">
2673
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<td class="diff-line-num new_line old" data-linenumber="2728" 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="LC2673" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">tv'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setVarType</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">ki'</span></span>
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<td class="diff-line-num new old_line" data-linenumber="2674" 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="2728" 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">
2728
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<pre style="margin: 0;">+<span id="LC2728" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">tv'</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setVarType</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">ki'</span></span>
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<pre style="margin: 0;"> <span id="LC2729" class="line" lang="haskell"> <span class="n" style="color: #333;">env'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendVarEnv</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">tv'</span></span>
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2675
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2730
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<pre style="margin: 0;"> <span id="LC2730" class="line" lang="haskell"> <span class="n" style="color: #333;">as'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">as</span> <span class="p">`</span><span class="n" style="color: #333;">delVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">tv</span></span>
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2676
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2731
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<pre style="margin: 0;"> <span id="LC2731" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">body'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="n" style="color: #333;">as'</span><span class="p">,</span> <span class="n" style="color: #333;">env'</span><span class="p">)</span> <span class="n" style="color: #333;">body_ty</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2694" 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="2749" 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">@@ -2694,9 +2749,12 @@ occCheckExpand vs_to_avoid ty</td>
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2694
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2749
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<pre style="margin: 0;"> <span id="LC2749" 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;">mkCoercionTy</span> <span class="n" style="color: #333;">co'</span><span class="p">)</span> <span class="p">}</span></span>
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2695
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2750
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<pre style="margin: 0;"> <span id="LC2750" class="line" lang="haskell"></span>
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2696
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2751
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<pre style="margin: 0;"> <span id="LC2751" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">------------------</span></span>
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2697
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<pre style="margin: 0;">-<span id="LC2697" class="line" lang="haskell"> <span class="n" style="color: #333;">go_var</span> <span class="n" style="color: #333;">cxt</span> <span class="n" style="color: #333;">v</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">updateVarTypeM</span> <span class="p">(</span><span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">cxt</span><span class="p">)</span> <span class="n" style="color: #333;">v</span></span>
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2698
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<pre style="margin: 0;">-<span id="LC2698" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Works for TyVar and CoVar</span></span>
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2699
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<pre style="margin: 0;">-<span id="LC2699" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Occurrence checking: look inside kinds]</span></span>
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2752
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<pre style="margin: 0;">+<span id="LC2752" class="line" lang="haskell"> <span class="n" style="color: #333;">bad_var_occ</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC2753" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Works for TyVar and CoVar</span></span>
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2754
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<pre style="margin: 0;">+<span id="LC2754" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Occurrence checking: look inside kinds]</span></span>
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<pre style="margin: 0;">+<span id="LC2755" class="line" lang="haskell"> <span class="n" style="color: #333;">bad_var_occ</span> <span class="n" style="color: #333;">vs_to_avoid</span> <span class="n" style="color: #333;">v</span></span>
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<pre style="margin: 0;">+<span id="LC2756" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">v</span> <span class="p">`</span><span class="n" style="color: #333;">elemVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">vs_to_avoid</span></span>
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2757
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<pre style="margin: 0;">+<span id="LC2757" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">tyCoVarsOfType</span> <span class="p">(</span><span class="n" style="color: #333;">varType</span> <span class="n" style="color: #333;">v</span><span class="p">)</span> <span class="p">`</span><span class="n" style="color: #333;">intersectsVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">vs_to_avoid</span></span>
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2700
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2758
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<pre style="margin: 0;"> <span id="LC2758" class="line" lang="haskell"></span>
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2701
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2759
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<pre style="margin: 0;"> <span id="LC2759" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">------------------</span></span>
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2702
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2760
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<pre style="margin: 0;"> <span id="LC2760" class="line" lang="haskell"> <span class="n" style="color: #333;">go_mco</span> <span class="kr" style="font-weight: 600;">_</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;">return</span> <span class="kt" style="color: #458; font-weight: 600;">MRefl</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2784" 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">@@ -2726,13 +2784,15 @@ occCheckExpand vs_to_avoid ty</td>
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2726
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2784
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<pre style="margin: 0;"> <span id="LC2784" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">co2'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">go_co</span> <span class="n" style="color: #333;">cxt</span> <span class="n" style="color: #333;">co2</span></span>
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2727
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2785
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<pre style="margin: 0;"> <span id="LC2785" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">w'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">go_co</span> <span class="n" style="color: #333;">cxt</span> <span class="n" style="color: #333;">w</span></span>
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<td class="diff-line-num old_line" data-linenumber="2728" 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">
2728
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<td class="diff-line-num new_line" data-linenumber="2786" 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">
2786
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<pre style="margin: 0;"> <span id="LC2786" 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;">mkFunCo</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">w'</span> <span class="n" style="color: #333;">co1'</span> <span class="n" style="color: #333;">co2'</span><span class="p">)</span> <span class="p">}</span></span>
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<td class="diff-line-num old old_line" data-linenumber="2729" 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">
2729
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<td class="diff-line-num new_line old" data-linenumber="2787" 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="LC2729" class="line" lang="haskell"> <span class="n" style="color: #333;">go_co</span> <span class="n" style="color: #333;">cxt</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="n" style="color: #333;">as</span><span class="p">,</span><span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoVarCo</span> <span class="n" style="color: #333;">c</span><span class="p">)</span></span>
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<td class="diff-line-num old old_line" data-linenumber="2730" 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">
2730
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<td class="diff-line-num new_line old" data-linenumber="2787" 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="LC2730" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">c</span> <span class="p">`</span><span class="n" style="color: #333;">elemVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">as</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<td class="diff-line-num new old_line" data-linenumber="2731" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="2787" 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">
2787
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<pre style="margin: 0;">+<span id="LC2787" class="line" lang="haskell"> <span class="n" style="color: #333;">go_co</span> <span class="p">(</span><span class="n" style="color: #333;">as</span><span class="p">,</span><span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">co</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoVarCo</span> <span class="n" style="color: #333;">c</span><span class="p">)</span></span>
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<td class="diff-line-num old_line" data-linenumber="2731" 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">
2731
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<td class="diff-line-num new_line" data-linenumber="2788" 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">
2788
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<pre style="margin: 0;"> <span id="LC2788" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">c'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupVarEnv</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkCoVarCo</span> <span class="n" style="color: #333;">c'</span><span class="p">)</span></span>
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<td class="diff-line-num old old_line" data-linenumber="2732" 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">
2732
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<td class="diff-line-num new_line old" data-linenumber="2789" 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="LC2732" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">c'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">go_var</span> <span class="n" style="color: #333;">cxt</span> <span class="n" style="color: #333;">c</span></span>
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<td class="diff-line-num old old_line" data-linenumber="2733" 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">
2733
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<td class="diff-line-num new_line old" data-linenumber="2789" 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="LC2733" 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;">mkCoVarCo</span> <span class="n" style="color: #333;">c'</span><span class="p">)</span> <span class="p">}</span></span>
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<td class="diff-line-num old old_line" data-linenumber="2734" 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">
2734
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<td class="diff-line-num new_line old" data-linenumber="2789" 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="LC2734" class="line" lang="haskell"> <span class="n" style="color: #333;">go_co</span> <span class="n" style="color: #333;">cxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HoleCo</span> <span class="n" style="color: #333;">h</span><span class="p">)</span> <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;">c'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">go_var</span> <span class="n" style="color: #333;">cxt</span> <span class="p">(</span><span class="n" style="color: #333;">ch_co_var</span> <span class="n" style="color: #333;">h</span><span class="p">)</span></span>
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<td class="diff-line-num old old_line" data-linenumber="2735" 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">
2735
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<td class="diff-line-num new_line old" data-linenumber="2789" 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="LC2735" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HoleCo</span> <span class="p">(</span><span class="n" style="color: #333;">h</span> <span class="p">{</span> <span class="n" style="color: #333;">ch_co_var</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">c'</span> <span class="p">}))</span> <span class="p">}</span></span>
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<td class="diff-line-num new old_line" data-linenumber="2736" 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="2789" 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">
2789
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<pre style="margin: 0;">+<span id="LC2789" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">bad_var_occ</span> <span class="n" style="color: #333;">as</span> <span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<td class="diff-line-num new old_line" data-linenumber="2736" 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="2790" 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">
2790
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<pre style="margin: 0;">+<span id="LC2790" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">co</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2791" 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">
2791
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<pre style="margin: 0;">+<span id="LC2791" class="line" lang="haskell"></span>
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<td class="diff-line-num new old_line" data-linenumber="2736" 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="2792" 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">
2792
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<pre style="margin: 0;">+<span id="LC2792" class="line" lang="haskell"> <span class="n" style="color: #333;">go_co</span> <span class="p">(</span><span class="n" style="color: #333;">as</span><span class="p">,</span><span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="n" style="color: #333;">co</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HoleCo</span> <span class="n" style="color: #333;">h</span><span class="p">)</span></span>
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<td class="diff-line-num new old_line" data-linenumber="2736" 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="2793" 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">
2793
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<pre style="margin: 0;">+<span id="LC2793" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">bad_var_occ</span> <span class="n" style="color: #333;">as</span> <span class="p">(</span><span class="n" style="color: #333;">ch_co_var</span> <span class="n" style="color: #333;">h</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<td class="diff-line-num new old_line" data-linenumber="2736" 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="2794" 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">
2794
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<pre style="margin: 0;">+<span id="LC2794" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">co</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="2795" 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">
2795
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<pre style="margin: 0;">+<span id="LC2795" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="2736" 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">
2736
</td>
<td class="diff-line-num new_line" data-linenumber="2796" 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">
2796
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<pre style="margin: 0;"> <span id="LC2796" class="line" lang="haskell"> <span class="n" style="color: #333;">go_co</span> <span class="n" style="color: #333;">cxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AxiomInstCo</span> <span class="n" style="color: #333;">ax</span> <span class="n" style="color: #333;">ind</span> <span class="n" style="color: #333;">args</span><span class="p">)</span> <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;">args'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">go_co</span> <span class="n" style="color: #333;">cxt</span><span class="p">)</span> <span class="n" style="color: #333;">args</span></span>
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<td class="diff-line-num old_line" data-linenumber="2737" 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">
2737
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<td class="diff-line-num new_line" data-linenumber="2797" 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">
2797
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<pre style="margin: 0;"> <span id="LC2797" 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;">mkAxiomInstCo</span> <span class="n" style="color: #333;">ax</span> <span class="n" style="color: #333;">ind</span> <span class="n" style="color: #333;">args'</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC2798" class="line" lang="haskell"> <span class="n" style="color: #333;">go_co</span> <span class="n" style="color: #333;">cxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UnivCo</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span> <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;">p'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">go_prov</span> <span class="n" style="color: #333;">cxt</span> <span class="n" style="color: #333;">p</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/911e0c4eafeaddf0eb9e42391b71e14f78fc8e30#74295edeac870ee7f2f3484ebaffab5c948b735a"><strong>compiler/GHC/Tc/Utils/Unify.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2046,21 +2046,8 @@ matchExpectedFunKind hs_ty n k = go n k</td>
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<pre style="margin: 0;"> <span id="LC2046" 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="LC2047" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2048" class="line" lang="haskell"></span>
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2049
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<pre style="margin: 0;">-<span id="LC2049" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Occurrence checking: look inside kinds]</span></span>
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2050
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<pre style="margin: 0;">-<span id="LC2050" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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2051
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<pre style="margin: 0;">-<span id="LC2051" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Suppose we are considering unifying</span></span>
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2052
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<pre style="margin: 0;">-<span id="LC2052" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (alpha :: *) ~ Int -> (beta :: alpha -> alpha)</span></span>
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2053
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<pre style="margin: 0;">-<span id="LC2053" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This may be an error (what is that alpha doing inside beta's kind?),</span></span>
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2054
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<pre style="margin: 0;">-<span id="LC2054" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">but we must not make the mistake of actually unifying or we'll</span></span>
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2055
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<pre style="margin: 0;">-<span id="LC2055" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">build an infinite data structure. So when looking for occurrences</span></span>
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2056
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<pre style="margin: 0;">-<span id="LC2056" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of alpha in the rhs, we must look in the kinds of type variables</span></span>
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2057
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<pre style="margin: 0;">-<span id="LC2057" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that occur there.</span></span>
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2058
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<pre style="margin: 0;">-<span id="LC2058" class="line" lang="haskell"></span>
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2059
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<pre style="margin: 0;">-<span id="LC2059" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">NB: we may be able to remove the problem via expansion; see</span></span>
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2060
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<pre style="margin: 0;">-<span id="LC2060" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Note [Occurs check expansion]. So we have to try that.</span></span>
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2061
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<pre style="margin: 0;">-<span id="LC2061" class="line" lang="haskell"></span>
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2062
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<pre style="margin: 0;">-<span id="LC2062" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Checking for foralls]</span></span>
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2063
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<pre style="margin: 0;">-<span id="LC2063" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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2049
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<pre style="margin: 0;">+<span id="LC2049" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Checking for foralls]</span></span>
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2050
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<pre style="margin: 0;">+<span id="LC2050" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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2064
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2051
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<pre style="margin: 0;"> <span id="LC2051" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Unless we have -XImpredicativeTypes (which is a totally unsupported</span></span>
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2052
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<pre style="margin: 0;"> <span id="LC2052" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">feature), we do not want to unify</span></span>
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2066
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2053
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<pre style="margin: 0;"> <span id="LC2053" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> alpha ~ (forall a. a->a) -> Int</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">@@ -2073,10 +2060,10 @@ Consider</td>
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2073
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2060
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<pre style="margin: 0;"> <span id="LC2060" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (alpha :: forall k. k->*) ~ (beta :: forall k. k->*)</span></span>
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2074
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2061
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<pre style="margin: 0;"> <span id="LC2061" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This is legal; e.g. dependent/should_compile/T11635.</span></span>
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2075
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2062
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<pre style="margin: 0;"> <span id="LC2062" class="line" lang="haskell"></span>
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2076
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<pre style="margin: 0;">-<span id="LC2076" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We don't want to reject it because of the forall in beta's kind,</span></span>
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2077
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<pre style="margin: 0;">-<span id="LC2077" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">but (see Note [Occurrence checking: look inside kinds]) we do</span></span></span>
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2078
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<pre style="margin: 0;">-<span id="LC2078" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">need to look in beta's kind. So we carry a flag saying if a 'forall'</span></span></span>
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2079
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<pre style="margin: 0;">-<span id="LC2079" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is OK, and switch the flag on when stepping inside a kind.</span></span>
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2063
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<pre style="margin: 0;">+<span id="LC2063" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We don't want to reject it because of the forall in beta's kind,<span class="idiff left right"> but</span></span></span>
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2064
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<pre style="margin: 0;">+<span id="LC2064" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">(see Note [Occurrence checking: look inside kinds] in GHC.Core.Type)</span></span></span>
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<pre style="margin: 0;">+<span id="LC2065" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">we do need to look in beta's kind. So we carry a flag saying if a</span></span></span>
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<pre style="margin: 0;">+<span id="LC2066" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">'forall' </span>is OK, and switch the flag on when stepping inside a kind.</span></span>
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2080
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2067
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<pre style="margin: 0;"> <span id="LC2067" class="line" lang="haskell"></span>
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2081
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2068
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<pre style="margin: 0;"> <span id="LC2068" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Why is it OK? Why does it not count as impredicative polymorphism?</span></span>
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2082
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2069
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<pre style="margin: 0;"> <span id="LC2069" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The reason foralls are bad is because we reply on "seeing" foralls</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">@@ -2197,6 +2184,7 @@ preCheck dflags ty_fam_ok tv ty</td>
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2197
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2184
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<pre style="margin: 0;"> <span id="LC2184" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">tv'</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MTVU_Occurs</span></span>
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2198
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<pre style="margin: 0;"> <span id="LC2185" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fast_check_occ</span> <span class="p">(</span><span class="n" style="color: #333;">tyVarKind</span> <span class="n" style="color: #333;">tv'</span><span class="p">)</span></span>
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2199
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2186
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<pre style="margin: 0;"> <span id="LC2186" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Occurrence checking: look inside kinds]</span></span>
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<pre style="margin: 0;">+<span id="LC2187" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in GHC.Core.Type</span></span>
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<pre style="margin: 0;"> <span id="LC2188" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2189" class="line" lang="haskell"> <span class="n" style="color: #333;">fast_check</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyConApp</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span></span>
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2190
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<pre style="margin: 0;"> <span id="LC2190" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">bad_tc</span> <span class="n" style="color: #333;">tc</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MTVU_Bad</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/911e0c4eafeaddf0eb9e42391b71e14f78fc8e30#ab33108b2030a78f4b19ab70b51200a5f2c280e1"><strong>testsuite/tests/polykinds/T18451.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 RankNTypes #-}</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 TypeInType #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">Bug</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Kind</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">Const</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">SameKind</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</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="kt" style="color: #458; font-weight: 600;">T</span> <span class="p">(</span><span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Const</span> <span class="kt" style="color: #458; font-weight: 600;">Type</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;">forall</span> <span class="p">(</span><span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">k</span><span class="p">)</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">SameKind</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/911e0c4eafeaddf0eb9e42391b71e14f78fc8e30#fe41287b9864f781d6d727f00089c261eb78d60b"><strong>testsuite/tests/polykinds/T18451.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T18451.hs:10:58: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Expected kind ‘k0’, but ‘b’ has kind ‘k’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> • In the second argument of ‘SameKind’, namely ‘b’</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> In the type ‘forall (b :: k). SameKind a b’</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> In the type declaration for ‘T’</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> • Type variable kinds:</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext"> a :: k0</span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext"> k :: Const (*) a</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/911e0c4eafeaddf0eb9e42391b71e14f78fc8e30#dd5304f6d30e3a7c90a3af1ef0bd8e1740500d74"><strong>testsuite/tests/polykinds/T18451a.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 RankNTypes #-}</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 TypeInType #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">Bug</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Kind</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Proxy</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;">type</span> <span class="kt" style="color: #458; font-weight: 600;">Const</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">a</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="n" style="color: #333;">foo</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span> <span class="p">(</span><span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Const</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="n" style="color: #333;">b</span><span class="p">)</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">Proxy</span> <span class="sc" style="color: #d14;">'[</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">a</span><span class="p">,</span> <span class="n" style="color: #333;">c</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="n" style="color: #333;">foo</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">error</span> <span class="s" style="color: #d14;">"ruk"</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/911e0c4eafeaddf0eb9e42391b71e14f78fc8e30#92083d117a500660ec3a8bc5accbc26cd1c337c1"><strong>testsuite/tests/polykinds/T18451a.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T18451a.hs:10:8: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • These kind and type variables: a b (c :: Const Type b)</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> are out of dependency order. Perhaps try this ordering:</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> (b :: k) (a :: Const (*) b) (c :: Const (*) b)</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> • In the type signature:</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> foo :: forall a b (c :: Const Type b). Proxy '[a, c]</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/911e0c4eafeaddf0eb9e42391b71e14f78fc8e30#1c8a99b4cc5649d9ddeaf15a86c43e6d7ad964ec"><strong>testsuite/tests/polykinds/T18451b.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 RankNTypes #-}</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 TypeInType #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">Bug</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Kind</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Proxy</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;">type</span> <span class="kt" style="color: #458; font-weight: 600;">Const</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">a</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="n" style="color: #333;">foo</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span> <span class="p">(</span><span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Const</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="n" style="color: #333;">b</span><span class="p">)</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">Proxy</span> <span class="sc" style="color: #d14;">'[</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">a</span><span class="p">,</span> <span class="n" style="color: #333;">c</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="n" style="color: #333;">foo</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">error</span> <span class="s" style="color: #d14;">"ruk"</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/911e0c4eafeaddf0eb9e42391b71e14f78fc8e30#21be264b935a9e9567dcaf08c32432dd9590269a"><strong>testsuite/tests/polykinds/T18451b.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T18451b.hs:10:8: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • These kind and type variables: a b (c :: Const Type b)</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> are out of dependency order. Perhaps try this ordering:</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> (b :: k) (a :: Const (*) b) (c :: Const (*) b)</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> • In the type signature:</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> foo :: forall a b (c :: Const Type b). Proxy '[a, c]</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/911e0c4eafeaddf0eb9e42391b71e14f78fc8e30#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">@@ -220,3 +220,6 @@ test('CuskFam', normal, compile, [''])</td>
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<pre style="margin: 0;"> <span id="LC220" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17841</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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221
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221
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<pre style="margin: 0;"> <span id="LC221" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17963</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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222
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<pre style="margin: 0;"> <span id="LC222" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18300</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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223
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<pre style="margin: 0;">+<span id="LC223" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18451</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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224
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<pre style="margin: 0;">+<span id="LC224" 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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225
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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;">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></pre>
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