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<h3>
Ryan Scott pushed to branch wip/T18939
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/e5dabf5534b55a340df10ed486fdb6afb054457d">e5dabf55</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-11-13T13:40:02-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use tcSplitForAllInvisTyVars (not tcSplitForAllTyVars) in more places
The use of `tcSplitForAllTyVars` in `tcDataFamInstHeader` was the immediate
cause of #18939, and replacing it with a new `tcSplitForAllInvisTyVars`
function (which behaves like `tcSplitForAllTyVars` but only splits invisible
type variables) fixes the issue. However, this led me to realize that _most_
uses of `tcSplitForAllTyVars` in GHC really ought to be
`tcSplitForAllInvisTyVars` instead. While I was in town, I opted to replace
most uses of `tcSplitForAllTys` with `tcSplitForAllTysInvis` to reduce the
likelihood of such bugs in the future.
I say "most uses" above since there is one notable place where we _do_ want
to use `tcSplitForAllTyVars`: in `GHC.Tc.Validity.forAllTyErr`, which produces
the "`Illegal polymorphic type`" error message if you try to use a higher-rank
`forall` without having `RankNTypes` enabled. Here, we really do want to split
all `forall`s, not just invisible ones, or we run the risk of giving an
inaccurate error message in the newly added `T18939_Fail` test case.
I debated at some length whether I wanted to name the new function
`tcSplitForAllInvisTyVars` or `tcSplitForAllTyVarsInvisible`, but in the end,
I decided that I liked the former better. For consistency's sake, I opted to
rename the existing `splitPiTysInvisible` and `splitPiTysInvisibleN` functions
to `splitInvisPiTys` and `splitPiTysInvisN`, respectively, so that they use the
same naming convention. As a consequence, this ended up requiring a `haddock`
submodule bump.
Fixes #18939.
</pre>
</li>
</ul>
<h4>15 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#84c9d3ba34173297e7d7747e02caa2e004b164fc">
compiler/GHC/Core/Type.hs
</a>
</li>
<li class="file-stats">
<a href="#9f0ddacf1490a1a7356d3b8c1b8506b1a8bc6ad4">
compiler/GHC/HsToCore/Foreign/Decl.hs
</a>
</li>
<li class="file-stats">
<a href="#8858278b4cb7284f96b29b5564bcb426de4fae70">
compiler/GHC/Runtime/Heap/Inspect.hs
</a>
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<li class="file-stats">
<a href="#9355bef855426caf5f526925edf351b20f9a86c4">
compiler/GHC/Tc/Gen/HsType.hs
</a>
</li>
<li class="file-stats">
<a href="#e63425e031ffe9350ee6b1687e506aaea75d11e1">
compiler/GHC/Tc/TyCl/Instance.hs
</a>
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<li class="file-stats">
<a href="#5d7c5ef0541bd4c1c950ecc95edf95171d20f538">
compiler/GHC/Tc/Utils/Backpack.hs
</a>
</li>
<li class="file-stats">
<a href="#59d42d45d27a766c3ef299d73c226697153b7f6e">
compiler/GHC/Tc/Utils/Instantiate.hs
</a>
</li>
<li class="file-stats">
<a href="#5461e7beeb7ae73d7c01f720cbaa3fa2c5333590">
compiler/GHC/Tc/Utils/TcType.hs
</a>
</li>
<li class="file-stats">
<a href="#1db07ed8cd9bab6b217a8f5a140176d3cb8672fd">
compiler/GHC/Tc/Validity.hs
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</li>
<li class="file-stats">
<a href="#121c5b4688f5006f4b45fc5534f3c9fc1d3ba950">
<span class="new-file">
+
testsuite/tests/typecheck/should_compile/T18939_Compile.hs
</span>
</a>
</li>
<li class="file-stats">
<a href="#34fe7bf0e6fbf60effb28393399ba68666593909">
testsuite/tests/typecheck/should_compile/all.T
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</li>
<li class="file-stats">
<a href="#056ecf30c38b10e0d1648200f6a9c72ad3b904e7">
<span class="new-file">
+
testsuite/tests/typecheck/should_fail/T18939_Fail.hs
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</a>
</li>
<li class="file-stats">
<a href="#6ec056147c93f4c1f281b11da26d7c948e350b6d">
<span class="new-file">
+
testsuite/tests/typecheck/should_fail/T18939_Fail.stderr
</span>
</a>
</li>
<li class="file-stats">
<a href="#b9e86d897a62509b0114d81d5e736630d6f68f43">
testsuite/tests/typecheck/should_fail/all.T
</a>
</li>
<li class="file-stats">
<a href="#46ddb8dda2edd2df4717a3285e83997fc812a347">
utils/haddock
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</ul>
<h4>Changes:</h4>
<li id="84c9d3ba34173297e7d7747e02caa2e004b164fc">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e5dabf5534b55a340df10ed486fdb6afb054457d#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">@@ -76,7 +76,7 @@ module GHC.Core.Type (</td>
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<pre style="margin: 0;"> <span id="LC76" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">coAxNthLHS</span><span class="p">,</span></span>
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<td class="diff-line-num old_line" data-linenumber="77" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC77" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">stripCoercionTy</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC78" class="line" lang="haskell"></span>
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<td class="diff-line-num new_line old" data-linenumber="79" 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="LC79" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">split<span class="idiff left">PiTysInvisible</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">splitPiTysInvisible</span>N</span><span class="p">,</span></span>
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<td class="diff-line-num new old_line" data-linenumber="80" 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="79" 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">
79
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<pre style="margin: 0;">+<span id="LC79" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">split<span class="idiff left">InvisPiTys</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">splitInvisPiTys</span>N</span><span class="p">,</span></span>
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<td class="diff-line-num old_line" data-linenumber="80" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC80" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">invisibleTyBndrCount</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC81" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">filterOutInvisibleTypes</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">filterOutInferredTypes</span><span class="p">,</span></span>
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<td class="diff-line-num old_line" data-linenumber="82" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC82" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">partitionInvisibleTypes</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">partitionInvisibles</span><span class="p">,</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1559" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1559" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1559,7 +1559,7 @@ splitForAllTyCoVars ty = split ty ty []</td>
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1559
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<pre style="margin: 0;"> <span id="LC1559" class="line" lang="haskell"> <span class="n" style="color: #333;">split</span> <span class="n" style="color: #333;">orig_ty</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">tvs</span> <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;">ty'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">coreView</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">split</span> <span class="n" style="color: #333;">orig_ty</span> <span class="n" style="color: #333;">ty'</span> <span class="n" style="color: #333;">tvs</span></span>
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<pre style="margin: 0;"> <span id="LC1560" class="line" lang="haskell"> <span class="n" style="color: #333;">split</span> <span class="n" style="color: #333;">orig_ty</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">reverse</span> <span class="n" style="color: #333;">tvs</span><span class="p">,</span> <span class="n" style="color: #333;">orig_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1561" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1562" class="line" lang="haskell"><span class="cd">-- | Splits the longest initial sequence of <span class="idiff left right">ForAllTys'</span> that satisfy</span></span>
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<pre style="margin: 0;">+<span id="LC1562" class="line" lang="haskell"><span class="cd">-- | Splits the longest initial sequence of <span class="idiff left right">'ForAllTy's</span> that satisfy</span></span>
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<pre style="margin: 0;"> <span id="LC1563" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @argf_pred@, returning the binders transformed by @argf_pred@</span></span>
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<pre style="margin: 0;"> <span id="LC1564" class="line" lang="haskell"><span class="n" style="color: #333;">splitSomeForAllTyCoVarBndrs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ArgFlag</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">af</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="p">([</span><span class="kt" style="color: #458; font-weight: 600;">VarBndr</span> <span class="kt" style="color: #458; font-weight: 600;">TyCoVar</span> <span class="n" style="color: #333;">af</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1565" class="line" lang="haskell"><span class="n" style="color: #333;">splitSomeForAllTyCoVarBndrs</span> <span class="n" style="color: #333;">argf_pred</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">split</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">ty</span> <span class="kt" style="color: #458; font-weight: 600;">[]</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">@@ -1716,12 +1716,12 @@ invisibleTyBndrCount :: Type -> Int</td>
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<pre style="margin: 0;"> <span id="LC1716" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Includes invisible predicate arguments; e.g. for</span></span>
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1717
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1717
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<pre style="margin: 0;"> <span id="LC1717" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- e.g. forall {k}. (k ~ *) => k -> k</span></span>
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1718
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1718
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<pre style="margin: 0;"> <span id="LC1718" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- returns 2 not 1</span></span>
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1719
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<pre style="margin: 0;">-<span id="LC1719" class="line" lang="haskell"><span class="n" style="color: #333;">invisibleTyBndrCount</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">length</span> <span class="p">(</span><span class="n" style="color: #333;">fst</span> <span class="p">(</span><span class="n" style="color: #333;">split<span class="idiff left right">PiTysInvisible</span></span> <span class="n" style="color: #333;">ty</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC1719" class="line" lang="haskell"><span class="n" style="color: #333;">invisibleTyBndrCount</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">length</span> <span class="p">(</span><span class="n" style="color: #333;">fst</span> <span class="p">(</span><span class="n" style="color: #333;">split<span class="idiff left right">InvisPiTys</span></span> <span class="n" style="color: #333;">ty</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC1720" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1721" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">Like splitPiTys, but returns only *invisible* binders, including constraints</span></span></span>
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<pre style="margin: 0;">-<span id="LC1722" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Stops at the first visible binder</span></span>
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<pre style="margin: 0;">-<span id="LC1723" class="line" lang="haskell"><span class="n" style="color: #333;">split<span class="idiff left right">PiTysInvisible</span></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="p">([</span><span class="kt" style="color: #458; font-weight: 600;">TyCoBinder</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1724" class="line" lang="haskell"><span class="n" style="color: #333;">split<span class="idiff left right">PiTysInvisible</span></span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">split</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">ty</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;">+<span id="LC1721" class="line" lang="haskell"><span class="cd">-- <span class="idiff left right">| Like 'splitPiTys', but returns only *invisible* binders, including constraints.</span></span></span>
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<pre style="margin: 0;">+<span id="LC1722" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Stops at the first visible binder<span class="idiff left right">.</span></span></span>
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<pre style="margin: 0;">+<span id="LC1723" class="line" lang="haskell"><span class="n" style="color: #333;">split<span class="idiff left right">InvisPiTys</span></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="p">([</span><span class="kt" style="color: #458; font-weight: 600;">TyCoBinder</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1724" class="line" lang="haskell"><span class="n" style="color: #333;">split<span class="idiff left right">InvisPiTys</span></span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">split</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">ty</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;"> <span id="LC1725" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1726
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<pre style="margin: 0;"> <span id="LC1726" class="line" lang="haskell"> <span class="n" style="color: #333;">split</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForAllTy</span> <span class="n" style="color: #333;">b</span> <span class="n" style="color: #333;">res</span><span class="p">)</span> <span class="n" style="color: #333;">bs</span></span>
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<pre style="margin: 0;"> <span id="LC1727" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Bndr</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">vis</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">b</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1732" 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>
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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">@@ -1732,11 +1732,11 @@ splitPiTysInvisible ty = split ty ty []</td>
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<pre style="margin: 0;"> <span id="LC1732" 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;">ty'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">coreView</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">split</span> <span class="n" style="color: #333;">orig_ty</span> <span class="n" style="color: #333;">ty'</span> <span class="n" style="color: #333;">bs</span></span>
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<pre style="margin: 0;"> <span id="LC1733" class="line" lang="haskell"> <span class="n" style="color: #333;">split</span> <span class="n" style="color: #333;">orig_ty</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">bs</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">reverse</span> <span class="n" style="color: #333;">bs</span><span class="p">,</span> <span class="n" style="color: #333;">orig_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1734" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1735" class="line" lang="haskell"><span class="n" style="color: #333;">split<span class="idiff left right">PiTysInvisible</span>N</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">TyCoBinder</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span></span>
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1736
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<pre style="margin: 0;">-<span id="LC1736" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">Same as splitPiTysInvisible</span>, but stop when</span></span>
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<pre style="margin: 0;">-<span id="LC1737" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- - you have found <span class="idiff left right">'n' TyCoBinder</span>s,</span></span>
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<pre style="margin: 0;">+<span id="LC1735" class="line" lang="haskell"><span class="n" style="color: #333;">split<span class="idiff left right">InvisPiTys</span>N</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">TyCoBinder</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1736" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">^ Same as 'splitInvisPiTys'</span>, but stop when</span></span>
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<pre style="margin: 0;">+<span id="LC1737" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- - you have found <span class="idiff left right">@n@ 'TyCoBinder'</span>s,</span></span>
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<pre style="margin: 0;"> <span id="LC1738" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- - or you run out of invisible binders</span></span>
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<pre style="margin: 0;">-<span id="LC1739" class="line" lang="haskell"><span class="n" style="color: #333;">split<span class="idiff left right">PiTysInvisible</span>N</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">split</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">ty</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;">+<span id="LC1739" class="line" lang="haskell"><span class="n" style="color: #333;">split<span class="idiff left right">InvisPiTys</span>N</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">split</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">ty</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;"> <span id="LC1740" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC1741" class="line" lang="haskell"> <span class="n" style="color: #333;">split</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">orig_ty</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">bs</span></span>
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<pre style="margin: 0;"> <span id="LC1742" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">==</span> <span class="mi" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">reverse</span> <span class="n" style="color: #333;">bs</span><span class="p">,</span> <span class="n" style="color: #333;">orig_ty</span><span class="p">)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e5dabf5534b55a340df10ed486fdb6afb054457d#9f0ddacf1490a1a7356d3b8c1b8506b1a8bc6ad4"><strong>compiler/GHC/HsToCore/Foreign/Decl.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">@@ -316,7 +316,7 @@ dsPrimCall :: Id -> Coercion -> ForeignCall</td>
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<pre style="margin: 0;"> <span id="LC316" class="line" lang="haskell"><span class="n" style="color: #333;">dsPrimCall</span> <span class="n" style="color: #333;">fn_id</span> <span class="n" style="color: #333;">co</span> <span class="n" style="color: #333;">fcall</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;"> <span id="LC317" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span></span>
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<pre style="margin: 0;"> <span id="LC318" class="line" lang="haskell"> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">coercionLKind</span> <span class="n" style="color: #333;">co</span></span>
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<pre style="margin: 0;">-<span id="LC319" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">tvs</span><span class="p">,</span> <span class="n" style="color: #333;">fun_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcSplitForAllTyVars</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC319" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">tvs</span><span class="p">,</span> <span class="n" style="color: #333;">fun_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcSplitForAll<span class="idiff left right">Invis</span>TyVars</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC320" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">arg_tys</span><span class="p">,</span> <span class="n" style="color: #333;">io_res_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcSplitFunTys</span> <span class="n" style="color: #333;">fun_ty</span></span>
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321
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<pre style="margin: 0;"> <span id="LC321" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC322" class="line" lang="haskell"> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newSysLocalsDs</span> <span class="n" style="color: #333;">arg_tys</span> <span class="c1" style="color: #998; font-style: italic;">-- no FFI levity-polymorphism</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">@@ -489,7 +489,7 @@ dsFExportDynamic id co0 cconv = do</td>
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<pre style="margin: 0;"> <span id="LC489" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC490" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC491" class="line" lang="haskell"> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">coercionLKind</span> <span class="n" style="color: #333;">co0</span></span>
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492
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<pre style="margin: 0;">-<span id="LC492" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">tvs</span><span class="p">,</span><span class="n" style="color: #333;">sans_foralls</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcSplitForAllTyVars</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC492" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">tvs</span><span class="p">,</span><span class="n" style="color: #333;">sans_foralls</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcSplitForAll<span class="idiff left right">Invis</span>TyVars</span> <span class="n" style="color: #333;">ty</span></span>
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493
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493
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<pre style="margin: 0;"> <span id="LC493" class="line" lang="haskell"> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">Scaled</span> <span class="n" style="color: #333;">arg_mult</span> <span class="n" style="color: #333;">arg_ty</span><span class="p">],</span> <span class="n" style="color: #333;">fn_res_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcSplitFunTys</span> <span class="n" style="color: #333;">sans_foralls</span></span>
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494
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<pre style="margin: 0;"> <span id="LC494" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">io_tc</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcSplitIOType_maybe</span> <span class="n" style="color: #333;">fn_res_ty</span></span>
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<pre style="margin: 0;"> <span id="LC495" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Must have an IO type; hence Just</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e5dabf5534b55a340df10ed486fdb6afb054457d#8858278b4cb7284f96b29b5564bcb426de4fae70"><strong>compiler/GHC/Runtime/Heap/Inspect.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">@@ -1389,4 +1389,4 @@ quantifyType ty = ( filter isTyVar $</td>
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<pre style="margin: 0;"> <span id="LC1389" class="line" lang="haskell"> <span class="n" style="color: #333;">tyCoVarsOfTypeWellScoped</span> <span class="n" style="color: #333;">rho</span></span>
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<pre style="margin: 0;"> <span id="LC1390" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">rho</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1391" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC1392" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">rho</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcSplitForAllTyVars</span> <span class="n" style="color: #333;">ty</span></span></pre>
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<pre style="margin: 0;">+<span id="LC1392" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">rho</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcSplitForAll<span class="idiff left right">Invis</span>TyVars</span> <span class="n" style="color: #333;">ty</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e5dabf5534b55a340df10ed486fdb6afb054457d#9355bef855426caf5f526925edf351b20f9a86c4"><strong>compiler/GHC/Tc/Gen/HsType.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">@@ -2568,13 +2568,13 @@ kcCheckDeclHeader_sig kisig name flav</td>
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<pre style="margin: 0;"> <span id="LC2568" class="line" lang="haskell"> <span class="n" style="color: #333;">split_invis</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;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">Kind</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">TyCoBinder</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">Kind</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2569" class="line" lang="haskell"> <span class="n" style="color: #333;">split_invis</span> <span class="n" style="color: #333;">sig_ki</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">=</span></span>
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2570
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<pre style="margin: 0;"> <span id="LC2570" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- instantiate all invisible binders</span></span>
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<pre style="margin: 0;">-<span id="LC2571" class="line" lang="haskell"> <span class="n" style="color: #333;">split<span class="idiff left right">PiTysInvisible</span></span> <span class="n" style="color: #333;">sig_ki</span></span>
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<pre style="margin: 0;">+<span id="LC2571" class="line" lang="haskell"> <span class="n" style="color: #333;">split<span class="idiff left right">InvisPiTys</span></span> <span class="n" style="color: #333;">sig_ki</span></span>
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2572
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<pre style="margin: 0;"> <span id="LC2572" class="line" lang="haskell"> <span class="n" style="color: #333;">split_invis</span> <span class="n" style="color: #333;">sig_ki</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">res_ki</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span></span>
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2573
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2573
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<pre style="margin: 0;"> <span id="LC2573" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- subtraction a la checkExpectedKind</span></span>
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2574
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2574
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<pre style="margin: 0;"> <span id="LC2574" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">n_res_invis_bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">invisibleTyBndrCount</span> <span class="n" style="color: #333;">res_ki</span></span>
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2575
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<pre style="margin: 0;"> <span id="LC2575" class="line" lang="haskell"> <span class="n" style="color: #333;">n_sig_invis_bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">invisibleTyBndrCount</span> <span class="n" style="color: #333;">sig_ki</span></span>
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2576
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<pre style="margin: 0;"> <span id="LC2576" class="line" lang="haskell"> <span class="n" style="color: #333;">n_inst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">n_sig_invis_bndrs</span> <span class="o" style="font-weight: 600;">-</span> <span class="n" style="color: #333;">n_res_invis_bndrs</span></span>
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2577
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<pre style="margin: 0;">-<span id="LC2577" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="n" style="color: #333;">split<span class="idiff left right">PiTysInvisible</span>N</span> <span class="n" style="color: #333;">n_inst</span> <span class="n" style="color: #333;">sig_ki</span></span>
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<pre style="margin: 0;">+<span id="LC2577" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="n" style="color: #333;">split<span class="idiff left right">InvisPiTys</span>N</span> <span class="n" style="color: #333;">n_inst</span> <span class="n" style="color: #333;">sig_ki</span></span>
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<pre style="margin: 0;"> <span id="LC2578" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2579" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- A quantifier from a kind signature zipped with a user-written binder for it.</span></span>
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<pre style="margin: 0;"> <span id="LC2580" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">ZippedBinder</span> <span class="o" style="font-weight: 600;">=</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e5dabf5534b55a340df10ed486fdb6afb054457d#e63425e031ffe9350ee6b1687e506aaea75d11e1"><strong>compiler/GHC/Tc/TyCl/Instance.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">@@ -950,7 +950,7 @@ tcDataFamInstHeader mb_clsinfo fam_tc outer_bndrs fixity</td>
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<pre style="margin: 0;"> <span id="LC950" class="line" lang="haskell"> <span class="n" style="color: #333;">tc_kind_sig</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">hs_kind</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC951" 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;">sig_kind</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcLHsKindSig</span> <span class="n" style="color: #333;">data_ctxt</span> <span class="n" style="color: #333;">hs_kind</span></span>
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<pre style="margin: 0;"> <span id="LC952" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">lvl</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getTcLevel</span></span>
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<pre style="margin: 0;">-<span id="LC953" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">tvs</span><span class="p">,</span> <span class="n" style="color: #333;">inner_kind</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcSplitForAllTyVars</span> <span class="n" style="color: #333;">sig_kind</span></span>
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<pre style="margin: 0;">+<span id="LC953" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">tvs</span><span class="p">,</span> <span class="n" style="color: #333;">inner_kind</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcSplitForAll<span class="idiff left right">Invis</span>TyVars</span> <span class="n" style="color: #333;">sig_kind</span></span>
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<pre style="margin: 0;"> <span id="LC954" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">subst</span><span class="p">,</span> <span class="n" style="color: #333;">_tvs'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInstSkolTyVarsAt</span> <span class="n" style="color: #333;">lvl</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="n" style="color: #333;">emptyTCvSubst</span> <span class="n" style="color: #333;">tvs</span></span>
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<pre style="margin: 0;"> <span id="LC955" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Perhaps surprisingly, we don't need the skolemised tvs themselves</span></span>
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<pre style="margin: 0;"> <span id="LC956" 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;">substTy</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">inner_kind</span><span class="p">)</span> <span class="p">}</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e5dabf5534b55a340df10ed486fdb6afb054457d#5d7c5ef0541bd4c1c950ecc95edf95171d20f538"><strong>compiler/GHC/Tc/Utils/Backpack.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">@@ -223,8 +223,8 @@ check_inst sig_inst = do</td>
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<pre style="margin: 0;"> <span id="LC223" class="line" lang="haskell"> <span class="n" style="color: #333;">skol_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">InstSkol</span></span>
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<pre style="margin: 0;"> <span id="LC224" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Based off of tcSplitDFunTy</span></span>
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<pre style="margin: 0;"> <span id="LC225" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">tvs</span><span class="p">,</span> <span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">pred</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">-<span id="LC226" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">tcSplitForAllTyVars</span> <span class="n" style="color: #333;">ty</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">tvs</span><span class="p">,</span> <span class="n" style="color: #333;">rho</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">-<span id="LC227" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">splitFunTys</span> <span class="n" style="color: #333;">rho</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">pred</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC226" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">tcSplitForAll<span class="idiff left right">Invis</span>TyVars</span> <span class="n" style="color: #333;">ty</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">tvs</span><span class="p">,</span> <span class="n" style="color: #333;">rho</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC227" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">splitFunTys</span> <span class="n" style="color: #333;">rho</span> <span class="idiff left right"> </span><span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">pred</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;"> <span id="LC228" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">tvs</span><span class="p">,</span> <span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">pred</span><span class="p">)</span> <span class="p">}}</span></span>
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<pre style="margin: 0;"> <span id="LC229" class="line" lang="haskell"> <span class="n" style="color: #333;">origin</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">InstProvidedOrigin</span> <span class="p">(</span><span class="n" style="color: #333;">tcg_semantic_mod</span> <span class="n" style="color: #333;">tcg_env</span><span class="p">)</span> <span class="n" style="color: #333;">sig_inst</span></span>
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<pre style="margin: 0;"> <span id="LC230" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">skol_subst</span><span class="p">,</span> <span class="n" style="color: #333;">tvs_skols</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInstSkolTyVars</span> <span class="n" style="color: #333;">tvs</span> <span class="c1" style="color: #998; font-style: italic;">-- Skolemize</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e5dabf5534b55a340df10ed486fdb6afb054457d#59d42d45d27a766c3ef299d73c226697153b7f6e"><strong>compiler/GHC/Tc/Utils/Instantiate.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">@@ -464,7 +464,7 @@ tcInstType inst_tyvars id</td>
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<pre style="margin: 0;"> <span id="LC464" class="line" lang="haskell"> <span class="n" style="color: #333;">subst'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendTCvInScopeSet</span> <span class="n" style="color: #333;">subst</span> <span class="p">(</span><span class="n" style="color: #333;">tyCoVarsOfType</span> <span class="n" style="color: #333;">rho</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC465" 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;">tv_prs</span><span class="p">,</span> <span class="n" style="color: #333;">substTheta</span> <span class="n" style="color: #333;">subst'</span> <span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">substTy</span> <span class="n" style="color: #333;">subst'</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC466" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC467" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">tyvars</span><span class="p">,</span> <span class="n" style="color: #333;">rho</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcSplitForAllTyVars</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">id</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC467" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">tyvars</span><span class="p">,</span> <span class="n" style="color: #333;">rho</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcSplitForAll<span class="idiff left right">Invis</span>TyVars</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">id</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC468" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcSplitPhiTy</span> <span class="n" style="color: #333;">rho</span></span>
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<pre style="margin: 0;"> <span id="LC469" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC470" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstTypeBndrs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">([(</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">InvisTVBinder</span><span class="p">)],</span> <span class="kt" style="color: #458; font-weight: 600;">TcThetaType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e5dabf5534b55a340df10ed486fdb6afb054457d#5461e7beeb7ae73d7c01f720cbaa3fa2c5333590"><strong>compiler/GHC/Tc/Utils/TcType.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">@@ -60,7 +60,7 @@ module GHC.Tc.Utils.TcType (</td>
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- These are important because they do not look through newtypes</span></span>
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<pre style="margin: 0;"> <span id="LC61" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">getTyVar</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC62" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcSplitForAllTyVarBinder_maybe</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC63" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcSplitForAllTyVars</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcSplitSomeForAllTyVars</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC63" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcSplitForAllTyVars</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcSplit<span class="idiff left">ForAllInvisTyVars</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">tcSplit</span>SomeForAllTyVars</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC64" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcSplitForAllReqTVBinders</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcSplitForAllInvisTVBinders</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC65" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcSplitPiTys</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcSplitPiTy_maybe</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcSplitForAllTyVarBinders</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC66" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcSplitPhiTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcSplitPredFunTy_maybe</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">@@ -1223,12 +1223,17 @@ tcSplitForAllTyVarBinder_maybe (ForAllTy tv ty) = ASSERT( isTyVarBinder tv ) Jus</td>
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<pre style="margin: 0;"> <span id="LC1223" class="line" lang="haskell"><span class="n" style="color: #333;">tcSplitForAllTyVarBinder_maybe</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<pre style="margin: 0;"> <span id="LC1224" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1225" class="line" lang="haskell"><span class="cd">-- | Like 'tcSplitPiTys', but splits off only named binders,</span></span>
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<pre style="margin: 0;">-<span id="LC1226" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- returning just the ty<span class="idiff left right">co</span>vars.</span></span>
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<pre style="margin: 0;">+<span id="LC1226" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- returning just the tyvars.</span></span>
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<pre style="margin: 0;"> <span id="LC1227" class="line" lang="haskell"><span class="n" style="color: #333;">tcSplitForAllTyVars</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="p">([</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1228" class="line" lang="haskell"><span class="n" style="color: #333;">tcSplitForAllTyVars</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC1229" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">all</span> <span class="n" style="color: #333;">isTyVar</span> <span class="p">(</span><span class="n" style="color: #333;">fst</span> <span class="n" style="color: #333;">sty</span><span class="p">)</span> <span class="p">)</span> <span class="n" style="color: #333;">sty</span></span>
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1230
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<pre style="margin: 0;"> <span id="LC1230" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">sty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitForAllTyCoVars</span> <span class="n" style="color: #333;">ty</span></span>
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1231
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<pre style="margin: 0;"> <span id="LC1231" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1232" class="line" lang="haskell"><span class="cd">-- | Like 'tcSplitForAllTyVars', but only splits 'ForAllTy's with 'Invisible'</span></span>
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<pre style="margin: 0;">+<span id="LC1233" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- type variable binders.</span></span>
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<pre style="margin: 0;">+<span id="LC1234" class="line" lang="haskell"><span class="n" style="color: #333;">tcSplitForAllInvisTyVars</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="p">([</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1235" class="line" lang="haskell"><span class="n" style="color: #333;">tcSplitForAllInvisTyVars</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcSplitSomeForAllTyVars</span> <span class="n" style="color: #333;">isInvisibleArgFlag</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC1236" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1237" class="line" lang="haskell"><span class="cd">-- | Like 'tcSplitForAllTyVars', but only splits a 'ForAllTy' if @argf_pred argf@</span></span>
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<pre style="margin: 0;"> <span id="LC1238" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- is 'True', where @argf@ is the visibility of the @ForAllTy@'s binder and</span></span>
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<pre style="margin: 0;"> <span id="LC1239" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @argf_pred@ is a predicate over visibilities provided as an argument to this</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">@@ -1284,9 +1289,11 @@ tcSplitPhiTy ty</td>
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<pre style="margin: 0;"> <span id="LC1289" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">pred</span><span class="p">,</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">split</span> <span class="n" style="color: #333;">ty</span> <span class="p">(</span><span class="n" style="color: #333;">pred</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">ts</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1290" 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="p">(</span><span class="n" style="color: #333;">reverse</span> <span class="n" style="color: #333;">ts</span><span class="p">,</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1291" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1287" class="line" lang="haskell"><span class="cd">-- | Split a sigma type into its parts.</span></span>
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<pre style="margin: 0;">+<span id="LC1292" class="line" lang="haskell"><span class="cd">-- | Split a sigma type into its parts. This only splits /invisible/ type</span></span>
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<pre style="margin: 0;">+<span id="LC1293" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- variable binders, as these are the only forms of binder that the typechecker</span></span>
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<pre style="margin: 0;">+<span id="LC1294" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- will implicitly instantiate.</span></span>
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<pre style="margin: 0;"> <span id="LC1295" class="line" lang="haskell"><span class="n" style="color: #333;">tcSplitSigmaTy</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="p">([</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">ThetaType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1289" class="line" lang="haskell"><span class="n" style="color: #333;">tcSplitSigmaTy</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">tcSplitForAllTyVars</span> <span class="n" style="color: #333;">ty</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC1296" class="line" lang="haskell"><span class="n" style="color: #333;">tcSplitSigmaTy</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">tcSplitForAll<span class="idiff left right">Invis</span>TyVars</span> <span class="n" style="color: #333;">ty</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC1297" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">tvs</span><span class="p">,</span> <span class="n" style="color: #333;">rho</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">tcSplitPhiTy</span> <span class="n" style="color: #333;">rho</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1298
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<pre style="margin: 0;"> <span id="LC1298" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">tvs</span><span class="p">,</span> <span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span></span>
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1299
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<pre style="margin: 0;"> <span id="LC1299" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1469,9 +1476,9 @@ tcSplitDFunTy :: Type -> ([TyVar], [Type], Class, [Type])</td>
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<pre style="margin: 0;"> <span id="LC1476" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the latter specifically stops at PredTy arguments,</span></span>
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1470
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1477
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<pre style="margin: 0;"> <span id="LC1477" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- and we don't want to do that here</span></span>
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1471
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1478
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<pre style="margin: 0;"> <span id="LC1478" class="line" lang="haskell"><span class="n" style="color: #333;">tcSplitDFunTy</span> <span class="n" style="color: #333;">ty</span></span>
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1472
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<pre style="margin: 0;">-<span id="LC1472" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">tcSplitForAllTyVars</span> <span class="n" style="color: #333;">ty</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">tvs</span><span class="p">,</span> <span class="n" style="color: #333;">rho</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span></span>
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1473
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<pre style="margin: 0;">-<span id="LC1473" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">splitFunTys</span> <span class="n" style="color: #333;">rho</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span></span>
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1474
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<pre style="margin: 0;">-<span id="LC1474" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">tcSplitDFunHead</span> <span class="n" style="color: #333;">tau</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">clas</span><span class="p">,</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span></span>
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1479
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<pre style="margin: 0;">+<span id="LC1479" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">tcSplitForAll<span class="idiff left right">Invis</span>TyVars</span> <span class="n" style="color: #333;">ty</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">tvs</span><span class="p">,</span> <span class="n" style="color: #333;">rho</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span></span>
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1480
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<pre style="margin: 0;">+<span id="LC1480" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">splitFunTys</span> <span class="n" style="color: #333;">rho</span> <span class="idiff left right"> </span><span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC1481" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">tcSplitDFunHead</span> <span class="n" style="color: #333;">tau</span> <span class="idiff left right"> </span><span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">clas</span><span class="p">,</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;"> <span id="LC1482" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">tvs</span><span class="p">,</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">scaledThing</span> <span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">clas</span><span class="p">,</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span> <span class="p">}}}</span></span>
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1476
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1483
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<pre style="margin: 0;"> <span id="LC1483" class="line" lang="haskell"></span>
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1477
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<pre style="margin: 0;"> <span id="LC1484" class="line" lang="haskell"><span class="n" style="color: #333;">tcSplitDFunHead</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="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Class</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">])</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1489,7 +1496,7 @@ tcSplitMethodTy :: Type -> ([TyVar], PredType, Type)</td>
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<pre style="margin: 0;"> <span id="LC1496" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- tcSplitMethodTy just peels off the outer forall and</span></span>
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1497
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<pre style="margin: 0;"> <span id="LC1497" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- that first predicate</span></span>
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<pre style="margin: 0;"> <span id="LC1498" class="line" lang="haskell"><span class="n" style="color: #333;">tcSplitMethodTy</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">-<span id="LC1492" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">sel_tyvars</span><span class="p">,</span><span class="n" style="color: #333;">sel_rho</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSplitForAllTyVars</span> <span class="n" style="color: #333;">ty</span></span>
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1499
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<pre style="margin: 0;">+<span id="LC1499" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">sel_tyvars</span><span class="p">,</span><span class="n" style="color: #333;">sel_rho</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSplitForAll<span class="idiff left right">Invis</span>TyVars</span> <span class="n" style="color: #333;">ty</span></span>
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1493
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1500
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<pre style="margin: 0;"> <span id="LC1500" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">first_pred</span><span class="p">,</span> <span class="n" style="color: #333;">local_meth_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSplitPredFunTy_maybe</span> <span class="n" style="color: #333;">sel_rho</span></span>
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1494
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1501
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<pre style="margin: 0;"> <span id="LC1501" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">sel_tyvars</span><span class="p">,</span> <span class="n" style="color: #333;">first_pred</span><span class="p">,</span> <span class="n" style="color: #333;">local_meth_ty</span><span class="p">)</span></span>
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1502
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<pre style="margin: 0;"> <span id="LC1502" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -924,7 +924,7 @@ forAllTyErr env rank ty</td>
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924
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<pre style="margin: 0;"> <span id="LC924" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">hang</span> <span class="n" style="color: #333;">herald</span> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">ppr_tidy</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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925
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925
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<pre style="margin: 0;"> <span id="LC925" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">suggestion</span> <span class="p">]</span> <span class="p">)</span></span>
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926
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926
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<pre style="margin: 0;"> <span id="LC926" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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927
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<pre style="margin: 0;">-<span id="LC927" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">tvs</span><span class="p">,</span> <span class="n" style="color: #333;">_<span class="idiff left">theta</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">_tau</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">tcSplitSigmaTy</span></span> <span class="n" style="color: #333;">ty</span></span>
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927
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<pre style="margin: 0;">+<span id="LC927" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">tvs</span><span class="p">,</span> <span class="n" style="color: #333;">_<span class="idiff left">rho</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">tcSplitForAllTyVars</span></span> <span class="n" style="color: #333;">ty</span></span>
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928
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928
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<pre style="margin: 0;"> <span id="LC928" class="line" lang="haskell"> <span class="n" style="color: #333;">herald</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Illegal qualified type:"</span></span>
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929
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929
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<pre style="margin: 0;"> <span id="LC929" 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;">text</span> <span class="s" style="color: #d14;">"Illegal polymorphic type:"</span></span>
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930
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930
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<pre style="margin: 0;"> <span id="LC930" class="line" lang="haskell"> <span class="n" style="color: #333;">suggestion</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">rank</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e5dabf5534b55a340df10ed486fdb6afb054457d#121c5b4688f5006f4b45fc5534f3c9fc1d3ba950"><strong>testsuite/tests/typecheck/should_compile/T18939_Compile.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE DataKinds #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE PolyKinds #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE RankNTypes #-}</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE StandaloneKindSignatures #-}</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE TypeFamilies #-}</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18939_Compile</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Kind</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">Hm</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</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="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Hm</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e5dabf5534b55a340df10ed486fdb6afb054457d#34fe7bf0e6fbf60effb28393399ba68666593909"><strong>testsuite/tests/typecheck/should_compile/all.T</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -726,6 +726,7 @@ test('T18323', normal, compile, [''])</td>
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<pre style="margin: 0;"> <span id="LC726" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18585</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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727
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727
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<pre style="margin: 0;"> <span id="LC727" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18831</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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728
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<pre style="margin: 0;"> <span id="LC728" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18920</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">+<span id="LC729" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18939_Compile</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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729
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730
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<pre style="margin: 0;"> <span id="LC730" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T15942</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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730
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<pre style="margin: 0;"> <span id="LC731" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">ClassDefaultInHsBoot</span><span class="p">',</span> <span class="p">[</span><span class="nv" style="color: #008080;">extra_files</span><span class="p">(['</span><span class="s1" style="color: #d14;">ClassDefaultInHsBootA1.hs</span><span class="p">','</span><span class="s1" style="color: #d14;">ClassDefaultInHsBootA2.hs</span><span class="p">','</span><span class="s1" style="color: #d14;">ClassDefaultInHsBootA2.hs-boot</span><span class="p">','</span><span class="s1" style="color: #d14;">ClassDefaultInHsBootA3.hs</span><span class="p">'])],</span> <span class="nv" style="color: #008080;">multimod_compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">ClassDefaultInHsBoot</span><span class="p">',</span> <span class="p">'</span><span class="s1" style="color: #d14;">-v0</span><span class="p">'])</span></span>
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732
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<pre style="margin: 0;"> <span id="LC732" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17186</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e5dabf5534b55a340df10ed486fdb6afb054457d#056ecf30c38b10e0d1648200f6a9c72ad3b904e7"><strong>testsuite/tests/typecheck/should_fail/T18939_Fail.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 ExplicitForAll #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE PolyKinds #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18939_Fail</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;">data</span> <span class="kt" style="color: #458; font-weight: 600;">F</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e5dabf5534b55a340df10ed486fdb6afb054457d#6ec056147c93f4c1f281b11da26d7c948e350b6d"><strong>testsuite/tests/typecheck/should_fail/T18939_Fail.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T18939_Fail.hs:5:1: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Illegal polymorphic type: forall a -> a</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> Perhaps you intended to use RankNTypes</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> • In the data type declaration for ‘F’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e5dabf5534b55a340df10ed486fdb6afb054457d#b9e86d897a62509b0114d81d5e736630d6f68f43"><strong>testsuite/tests/typecheck/should_fail/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">@@ -583,6 +583,7 @@ test('T18714', normal, compile_fail, [''])</td>
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583
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583
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<pre style="margin: 0;"> <span id="LC583" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18723a</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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584
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584
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<pre style="margin: 0;"> <span id="LC584" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18723b</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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585
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585
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<pre style="margin: 0;"> <span id="LC585" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18723c</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">+<span id="LC586" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18939_Fail</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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586
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587
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<pre style="margin: 0;"> <span id="LC587" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">too-many</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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587
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<pre style="margin: 0;"> <span id="LC588" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18640a</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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588
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589
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<pre style="margin: 0;"> <span id="LC589" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18640b</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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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e5dabf5534b55a340df10ed486fdb6afb054457d#46ddb8dda2edd2df4717a3285e83997fc812a347"><strong>utils/haddock</strong></a>
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<pre style="margin: 0;">-Subproject commit <span class="idiff left right">ad9cbad7312a64e6757c32bd9488c55ba4f2fec9</span></pre>
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<pre style="margin: 0;">+Subproject commit <span class="idiff left right">4d0498d503bd51b7d7626497580232685a2691a1</span></pre>
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