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<h3>
Ryan Scott pushed to branch wip/T18191
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/448cfdfb7c50463a092d35ea48c5b1a33eee3ba0">448cfdfb</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-05-26T09:46:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make GADT constructors adhere to the forall-or-nothing rule properly
Issue #18191 revealed that the types of GADT constructors don't quite
adhere to the `forall`-or-nothing rule. This patch serves to clean up
this sad state of affairs somewhat. The main change is not in the
code itself, but in the documentation, as this patch introduces two
sections to the GHC User's Guide:
* A "Formal syntax for GADTs" section that presents a BNF-style
grammar for what is and isn't allowed in GADT constructor types.
This mostly exists to codify GHC's existing behavior, but it also
imposes a new restriction that addresses #18191: the outermost
`forall` and/or context in a GADT constructor is not allowed to be
surrounded by parentheses. Doing so would make these
`forall`s/contexts nested, and GADTs do not support nested
`forall`s/contexts at present.
* A "`forall`-or-nothing rule" section that describes exactly what
the `forall`-or-nothing rule is all about. Surprisingly, there was
no mention of this anywhere in the User's Guide up until now!
To adhere the new specification in the "Formal syntax for GADTs"
section of the User's Guide, the following code changes were made:
* `GHC.Parser.PostProcess.mkGadtDecl` no longer strips away
parentheses from the outermost `forall` and context. Instead, these
parentheses are preserved so that the renamer can check for nested
`forall`s/contexts later. See
`Note [No nested foralls or contexts in GADT constructors]` in
`GHC.Parser.PostProcess` for more details.
One nice side effect of this change is that we can get rid of the
explicit `AddAnn` tracking in `mkGadtDecl`, as we no longer need to
remember the `AddAnn`s for stripped-away parentheses.
* `GHC.Renamer.Module.rnConDecl` now checks for nested
`forall`s/contexts, rather than checking for this in the typechcker
(in `GHC.Tc.TyCl.badDataConTyCon`). For the most part, this code
was ported directly from `badDataConTyCon`, but designed to work
over `HsType`s instead of `Type`s.
One nice side effect of this change is that we are able to give a
more accurate error message for GADT constructors that use visible
dependent quantification (e.g., `MkFoo :: forall a -> a -> Foo a`),
which improves the stderr in the `T16326_Fail6` test case.
Fixes #18191.
</pre>
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<h4>20 changed files:</h4>
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<li class="file-stats">
<a href="#bf951467d4a9aa443cb109cb4c84a2891945649b">
compiler/GHC/Parser.y
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<li class="file-stats">
<a href="#446cb12ca6cefaf1c6eb79b7db643632744263c7">
compiler/GHC/Parser/PostProcess.hs
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<li class="file-stats">
<a href="#7dd1cd0f6f2164a14c83d9aa564dd32bc30e447a">
compiler/GHC/Rename/Module.hs
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<li class="file-stats">
<a href="#83d23a46bb6cdc8b1edc16f1fd2c8f5c53e2c9ca">
compiler/GHC/Tc/TyCl.hs
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<li class="file-stats">
<a href="#2eac51f9871ca0c0698aa1fc7f79c05ef8fc4a49">
compiler/GHC/ThToHs.hs
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<li class="file-stats">
<a href="#b421960e854c6cfa1e4ca830bd6a5fc6eef91168">
docs/users_guide/8.12.1-notes.rst
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<li class="file-stats">
<a href="#afd1105d8e32dc50acf9fc381b4433a3bcd009cf">
docs/users_guide/exts/explicit_forall.rst
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<li class="file-stats">
<a href="#0cc784483e34410e9b43b5cfc23ee304faba81d1">
docs/users_guide/exts/gadt_syntax.rst
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<a href="#acf377a6048463af1be7194687028ceca893b4d0">
testsuite/tests/dependent/should_fail/T16326_Fail6.stderr
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<li class="file-stats">
<a href="#6ef4f569c6fe7aa5345ba1eb75f039b06e91950b">
testsuite/tests/gadt/T12087.stderr
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<a href="#8509bb9f0f6ac1ee468886ad737f9cec2fae114e">
testsuite/tests/gadt/T14320.hs
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testsuite/tests/gadt/T14320.stderr
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<a href="#e1050500257a847cc4105b93168583a72a01cec5">
testsuite/tests/gadt/T16427.stderr
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testsuite/tests/gadt/T18191.hs
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testsuite/tests/gadt/T18191.stderr
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<a href="#c68bb340f8f227ab4ac9922422ce0177433e1dfc">
testsuite/tests/gadt/all.T
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<a href="#4a46b9f4641629031a489def4b0fc1d83d099988">
testsuite/tests/ghc-api/annotations/T10399.stdout
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<a href="#dda3d34c53662ecea8d6db93a554833039ce70a6">
testsuite/tests/ghc-api/annotations/Test10399.hs
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<a href="#f280a86ff33795996823f122b6eb9e188375d60d">
testsuite/tests/parser/should_compile/T15323.hs
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<a href="#80cef6ecfd8cfb192e74919082dee97bf5a70067">
testsuite/tests/parser/should_compile/T15323.stderr
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<h4>Changes:</h4>
<li id="bf951467d4a9aa443cb109cb4c84a2891945649b">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/448cfdfb7c50463a092d35ea48c5b1a33eee3ba0#bf951467d4a9aa443cb109cb4c84a2891945649b"><strong>compiler/GHC/Parser.y</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">@@ -2248,9 +2248,8 @@ gadt_constr :: { LConDecl GhcPs }</td>
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<pre style="margin: 0;"> <span id="LC2248" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- see Note [Difference in parsing GADT and data constructors]</span></span>
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<pre style="margin: 0;"> <span id="LC2249" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Returns a list because of: C,D :: ty</span></span>
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<pre style="margin: 0;"> <span id="LC2250" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">con_list</span> <span class="sc" style="color: #d14;">':</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">:</span><span class="sc" style="color: #d14;">' </span><span class="err" style="color: #a61717; background-color: #e3d2d2;">s</span><span class="n" style="color: #333;">igtypedoc</span></span>
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<pre style="margin: 0;">-<span id="LC2251" class="line" lang="haskell"> <span class="p">{</span><span class="o" style="font-weight: 600;">%</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">gadt</span><span class="p">,</span><span class="n" style="color: #333;">anns</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkGadtDecl</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">3</span></span>
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<pre style="margin: 0;">-<span id="LC2252" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="n" style="color: #333;">ams</span> <span class="p">(</span><span class="n" style="color: #333;">sLL</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">$></span> <span class="n" style="color: #333;">gadt</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC2253" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mu</span> <span class="kt" style="color: #458; font-weight: 600;">AnnDcolon</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">2</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">anns</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC2251" class="line" lang="haskell"> <span class="p">{</span><span class="o" style="font-weight: 600;">%</span> <span class="n" style="color: #333;">ams</span> <span class="p">(</span><span class="n" style="color: #333;">sLL</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">$></span> <span class="p">(</span><span class="n" style="color: #333;">mkGadtDecl</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">3</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC2252" class="line" lang="haskell"> <span class="p">[</span><span class="n" style="color: #333;">mu</span> <span class="kt" style="color: #458; font-weight: 600;">AnnDcolon</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">2</span><span class="p">]</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC2253" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2254" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Difference in parsing GADT and data constructors]</span></span>
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<pre style="margin: 0;"> <span id="LC2255" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<li id="446cb12ca6cefaf1c6eb79b7db643632744263c7">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/448cfdfb7c50463a092d35ea48c5b1a33eee3ba0#446cb12ca6cefaf1c6eb79b7db643632744263c7"><strong>compiler/GHC/Parser/PostProcess.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">@@ -685,30 +685,41 @@ mkConDeclH98 name mb_forall mb_cxt args</td>
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<pre style="margin: 0;"> <span id="LC685" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">con_args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;"> <span id="LC686" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">con_doc</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC687" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC688" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Construct a GADT-style data constructor from the constructor names and their</span></span>
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<pre style="margin: 0;">+<span id="LC689" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- type. Does not perform any validity checking, as that it done later in</span></span>
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<pre style="margin: 0;">+<span id="LC690" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- GHC.Rename.Module.rnConDecl.</span></span>
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<pre style="margin: 0;"> <span id="LC691" class="line" lang="haskell"><span class="n" style="color: #333;">mkGadtDecl</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">RdrName</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC692" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="c1" style="color: #998; font-style: italic;">-- Always a HsForAllTy</span></span>
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<pre style="margin: 0;">-<span id="LC690" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">ConDecl</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">GhcPs</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">AddAnn</span></span><span class="p"><span class="idiff right">])</span></span></span>
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<pre style="margin: 0;">+<span id="LC693" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">ConDecl</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">GhcPs</span></span></span>
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<pre style="margin: 0;"> <span id="LC694" class="line" lang="haskell"><span class="n" style="color: #333;">mkGadtDecl</span> <span class="n" style="color: #333;">names</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">-<span id="LC692" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ConDeclGADT</span> <span class="p">{</span> <span class="n" style="color: #333;">con_g_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">noExtField</span></span>
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<pre style="margin: 0;">-<span id="LC693" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">con_names</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">names</span></span>
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<pre style="margin: 0;">-<span id="LC694" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">con_forall</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">isLHsForAllTy</span> <span class="n" style="color: #333;">ty'</span></span>
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<pre style="margin: 0;">-<span id="LC695" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">con_qvars</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tvs</span></span>
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<pre style="margin: 0;">-<span id="LC696" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">con_mb_cxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mcxt</span></span>
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<pre style="margin: 0;">-<span id="LC697" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">con_args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">-<span id="LC698" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">con_res_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;">-<span id="LC699" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">con_doc</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC700" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">anns1</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">anns2</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC695" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ConDeclGADT</span> <span class="p">{</span> <span class="n" style="color: #333;">con_g_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">noExtField</span></span>
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<pre style="margin: 0;">+<span id="LC696" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">con_names</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">names</span></span>
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<pre style="margin: 0;">+<span id="LC697" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">con_forall</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="p">(</span><span class="n" style="color: #333;">getLoc</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;">isJust</span> <span class="n" style="color: #333;">mtvs</span></span>
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<pre style="margin: 0;">+<span id="LC698" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">con_qvars</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fromMaybe</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">mtvs</span></span>
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<pre style="margin: 0;">+<span id="LC699" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">con_mb_cxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mcxt</span></span>
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<pre style="margin: 0;">+<span id="LC700" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">con_args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">+<span id="LC701" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">con_res_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">res_ty</span></span>
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702
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<pre style="margin: 0;">+<span id="LC702" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">con_doc</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="p">}</span></span>
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703
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<pre style="margin: 0;"> <span id="LC703" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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702
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<pre style="margin: 0;">-<span id="LC702" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ty'</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">l</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">),</span><span class="n" style="color: #333;">anns1</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">peel_parens</span> <span class="n" style="color: #333;">ty</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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703
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<pre style="margin: 0;">-<span id="LC703" 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;">splitLHsForAllTyInvis</span> <span class="n" style="color: #333;">ty'</span></span>
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704
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<pre style="margin: 0;">-<span id="LC704" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mcxt</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">,</span> <span class="n" style="color: #333;">anns2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">split_rho</span> <span class="n" style="color: #333;">rho</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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705
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<pre style="margin: 0;">-<span id="LC705" class="line" lang="haskell"></span>
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706
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<pre style="margin: 0;">-<span id="LC706" class="line" lang="haskell"> <span class="n" style="color: #333;">split_rho</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsQualTy</span> <span class="p">{</span> <span class="n" style="color: #333;">hst_ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cxt</span><span class="p">,</span> <span class="n" style="color: #333;">hst_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tau</span> <span class="p">}))</span> <span class="n" style="color: #333;">ann</span></span>
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707
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<pre style="margin: 0;">-<span id="LC707" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">cxt</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">,</span> <span class="n" style="color: #333;">ann</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC708" class="line" lang="haskell"> <span class="n" style="color: #333;">split_rho</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">l</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsParTy</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ty</span><span class="p">))</span> <span class="n" style="color: #333;">ann</span></span>
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709
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<pre style="margin: 0;">-<span id="LC709" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">split_rho</span> <span class="n" style="color: #333;">ty</span> <span class="p">(</span><span class="n" style="color: #333;">ann</span><span class="o" style="font-weight: 600;">++</span><span class="n" style="color: #333;">mkParensApiAnn</span> <span class="n" style="color: #333;">l</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC710" class="line" lang="haskell"> <span class="n" style="color: #333;">split_rho</span> <span class="n" style="color: #333;">tau</span> <span class="n" style="color: #333;">ann</span></span>
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<pre style="margin: 0;">-<span id="LC711" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">,</span> <span class="n" style="color: #333;">ann</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC704" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mtvs</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;">split_sigma</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC705" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mcxt</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;">split_rho</span> <span class="n" style="color: #333;">rho</span></span>
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<pre style="margin: 0;">+<span id="LC707" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: We do not use splitLHsForAllTyInvis below, since that looks through</span></span>
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<pre style="margin: 0;">+<span id="LC708" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- parentheses...</span></span>
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<pre style="margin: 0;">+<span id="LC709" class="line" lang="haskell"> <span class="n" style="color: #333;">split_sigma</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsForAllTy</span> <span class="p">{</span> <span class="n" style="color: #333;">hst_fvf</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ForallInvis</span><span class="p">,</span> <span class="n" style="color: #333;">hst_bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bndrs</span></span>
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<pre style="margin: 0;">+<span id="LC710" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hst_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rho</span> <span class="p">}))</span></span>
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<pre style="margin: 0;">+<span id="LC711" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">bndrs</span><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="LC712" class="line" lang="haskell"> <span class="n" style="color: #333;">split_sigma</span> <span class="n" style="color: #333;">sigma</span></span>
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<pre style="margin: 0;">+<span id="LC713" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">,</span> <span class="n" style="color: #333;">sigma</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC714" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC715" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ...similarly, we do not use splitLHsQualTy below, since that also looks</span></span>
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716
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<pre style="margin: 0;">+<span id="LC716" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- through parentheses.</span></span>
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<pre style="margin: 0;">+<span id="LC717" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [No nested foralls or contexts in GADT constructors] for why</span></span>
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<pre style="margin: 0;">+<span id="LC718" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- this is important.</span></span>
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719
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<pre style="margin: 0;">+<span id="LC719" class="line" lang="haskell"> <span class="n" style="color: #333;">split_rho</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsQualTy</span> <span class="p">{</span> <span class="n" style="color: #333;">hst_ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cxt</span><span class="p">,</span> <span class="n" style="color: #333;">hst_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tau</span> <span class="p">}))</span></span>
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720
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<pre style="margin: 0;">+<span id="LC720" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">cxt</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC721" class="line" lang="haskell"> <span class="n" style="color: #333;">split_rho</span> <span class="n" style="color: #333;">tau</span></span>
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<pre style="margin: 0;">+<span id="LC722" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC723" class="line" lang="haskell"></span>
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724
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<pre style="margin: 0;"> <span id="LC724" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">args</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;">split_tau</span> <span class="n" style="color: #333;">tau</span></span>
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725
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<pre style="margin: 0;"> <span id="LC725" 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">@@ -718,10 +729,43 @@ mkGadtDecl names ty</td>
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<pre style="margin: 0;"> <span id="LC729" class="line" lang="haskell"> <span class="n" style="color: #333;">split_tau</span> <span class="n" style="color: #333;">tau</span></span>
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<pre style="margin: 0;"> <span id="LC730" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PrefixCon</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC731" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC721" class="line" lang="haskell"> <span class="n" style="color: #333;">peel_parens</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">l</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsParTy</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ty</span><span class="p">))</span> <span class="n" style="color: #333;">ann</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">peel_parens</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">-<span id="LC722" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ann</span><span class="o" style="font-weight: 600;">++</span><span class="n" style="color: #333;">mkParensApiAnn</span> <span class="n" style="color: #333;">l</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC723" class="line" lang="haskell"> <span class="n" style="color: #333;">peel_parens</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">ann</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">ty</span><span class="p">,</span> <span class="n" style="color: #333;">ann</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC724" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC732" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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<pre style="margin: 0;">+<span id="LC733" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [No nested foralls or contexts in GADT constructors]</span></span>
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<pre style="margin: 0;">+<span id="LC734" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">+<span id="LC735" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GADT constructors provide some freedom to change the order of foralls in their</span></span>
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<pre style="margin: 0;">+<span id="LC736" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">types (see Note [DataCon user type variable binders] in GHC.Core.DataCon), but</span></span>
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<pre style="margin: 0;">+<span id="LC737" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">this freedom is still limited. GADTs still require that all quantification</span></span>
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<pre style="margin: 0;">+<span id="LC738" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">occurs prenex. That is, any explicitly quantified type variables must occur at</span></span>
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<pre style="margin: 0;">+<span id="LC739" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the front of the GADT type, followed by any contexts, followed by the body of</span></span>
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<pre style="margin: 0;">+<span id="LC740" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the GADT type, in precisely that order. For instance:</span></span>
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<pre style="margin: 0;">+<span id="LC741" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC742" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T where</span></span>
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<pre style="margin: 0;">+<span id="LC743" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkT1 :: forall a b. (Eq a, Eq b) => a -> b -> T</span></span>
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<pre style="margin: 0;">+<span id="LC744" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- OK</span></span>
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<pre style="margin: 0;">+<span id="LC745" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkT2 :: forall a. Eq a => forall b. a -> b -> T</span></span>
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746
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<pre style="margin: 0;">+<span id="LC746" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- Rejected, `forall b` is nested</span></span>
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<pre style="margin: 0;">+<span id="LC747" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkT3 :: forall a b. Eq a => Eq b => a -> b -> T</span></span>
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<pre style="margin: 0;">+<span id="LC748" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- Rejected, `Eq b` is nested</span></span>
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<pre style="margin: 0;">+<span id="LC749" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkT4 :: Int -> forall a. a -> T</span></span>
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750
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<pre style="margin: 0;">+<span id="LC750" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- Rejected, `forall a` is nested</span></span>
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751
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<pre style="margin: 0;">+<span id="LC751" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkT5 :: forall a. Int -> Eq a => a -> T</span></span>
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752
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<pre style="margin: 0;">+<span id="LC752" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- Rejected, `Eq a` is nested</span></span>
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753
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<pre style="margin: 0;">+<span id="LC753" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkT6 :: (forall a. a -> T)</span></span>
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754
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<pre style="margin: 0;">+<span id="LC754" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- Rejected, `forall a` is nested due to the surrounding parentheses</span></span>
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755
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<pre style="margin: 0;">+<span id="LC755" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkT7 :: (Eq a => a -> t)</span></span>
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756
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<pre style="margin: 0;">+<span id="LC756" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- Rejected, `Eq a` is nested due to the surrounding parentheses</span></span>
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757
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<pre style="margin: 0;">+<span id="LC757" class="line" lang="haskell"></span>
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758
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<pre style="margin: 0;">+<span id="LC758" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For the full details, see the "Formal syntax for GADTs" section of the GHC</span></span>
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759
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<pre style="margin: 0;">+<span id="LC759" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">User's Guide.</span></span>
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760
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<pre style="margin: 0;">+<span id="LC760" class="line" lang="haskell"></span>
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761
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<pre style="margin: 0;">+<span id="LC761" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Because the presence of outermost parentheses can affect whether</span></span>
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762
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<pre style="margin: 0;">+<span id="LC762" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">`forall`s/contexts are nested, the parser is careful not to remove parentheses</span></span>
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763
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<pre style="margin: 0;">+<span id="LC763" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">when post-processing GADT constructors (in mkGadtDecl). Later, the renamer will</span></span>
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764
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<pre style="margin: 0;">+<span id="LC764" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">check for nested `forall`s/contexts (in GHC.Rename.Module.rnConDecl) after</span></span>
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765
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<pre style="margin: 0;">+<span id="LC765" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">it has determined what all of the argument types are.</span></span>
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766
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<pre style="margin: 0;">+<span id="LC766" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(See Note [GADT abstract syntax] in GHC.Hs.Decls for why this check must wait</span></span>
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<pre style="margin: 0;">+<span id="LC767" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">until the renamer.)</span></span>
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768
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<pre style="margin: 0;">+<span id="LC768" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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769
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<pre style="margin: 0;"> <span id="LC769" class="line" lang="haskell"></span>
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726
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770
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<pre style="margin: 0;"> <span id="LC770" class="line" lang="haskell"><span class="n" style="color: #333;">setRdrNameSpace</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">RdrName</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">NameSpace</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RdrName</span></span>
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727
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771
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<pre style="margin: 0;"> <span id="LC771" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ^ This rather gruesome function is used mainly by the parser.</span></span>
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<li id="7dd1cd0f6f2164a14c83d9aa564dd32bc30e447a">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/448cfdfb7c50463a092d35ea48c5b1a33eee3ba0#7dd1cd0f6f2164a14c83d9aa564dd32bc30e447a"><strong>compiler/GHC/Rename/Module.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">@@ -2126,16 +2126,21 @@ rnConDecl decl@(ConDeclGADT { con_names = names</td>
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2126
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2126
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<pre style="margin: 0;"> <span id="LC2126" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">new_cxt</span><span class="p">,</span> <span class="n" style="color: #333;">fvs1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnMbContext</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">mcxt</span></span>
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2127
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2127
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<pre style="margin: 0;"> <span id="LC2127" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">new_args</span><span class="p">,</span> <span class="n" style="color: #333;">fvs2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnConDeclDetails</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="p">(</span><span class="n" style="color: #333;">head</span> <span class="n" style="color: #333;">new_names</span><span class="p">))</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">args</span></span>
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2128
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2128
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<pre style="margin: 0;"> <span id="LC2128" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">new_res_ty</span><span class="p">,</span> <span class="n" style="color: #333;">fvs3</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnLHsType</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">res_ty</span></span>
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2129
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<pre style="margin: 0;">+<span id="LC2129" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">args'</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>
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<pre style="margin: 0;">+<span id="LC2130" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">args</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2131
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<pre style="margin: 0;">+<span id="LC2131" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">InfixCon</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"rnConDecl"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">names</span><span class="p">)</span></span>
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2132
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<pre style="margin: 0;">+<span id="LC2132" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">RecCon</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">new_args</span><span class="p">,</span> <span class="n" style="color: #333;">new_res_ty</span><span class="p">)</span></span>
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2133
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<pre style="margin: 0;">+<span id="LC2133" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PrefixCon</span> <span class="n" style="color: #333;">as</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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2134
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<pre style="margin: 0;">+<span id="LC2134" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- In the PrefixCon case, the parser puts the entire body of</span></span>
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2135
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<pre style="margin: 0;">+<span id="LC2135" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the constructor type, including argument types, into res_ty.</span></span>
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<pre style="margin: 0;">+<span id="LC2136" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We can properly determine what the argument types are after</span></span>
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2137
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<pre style="margin: 0;">+<span id="LC2137" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- renaming (see Note [GADT abstract syntax] in GHC.Hs.Decls),</span></span>
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2138
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<pre style="margin: 0;">+<span id="LC2138" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- so we do so by splitting new_res_ty below.</span></span>
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2139
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<pre style="margin: 0;">+<span id="LC2139" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">as</span> <span class="p">)</span></span>
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2140
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<pre style="margin: 0;">+<span id="LC2140" 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;">final_res_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">split_prefix_gadt_ty</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">new_res_ty</span></span>
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<pre style="margin: 0;">+<span id="LC2141" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PrefixCon</span> <span class="n" style="color: #333;">arg_tys</span><span class="p">,</span> <span class="n" style="color: #333;">final_res_ty</span><span class="p">)</span></span>
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2142
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<pre style="margin: 0;"> <span id="LC2142" class="line" lang="haskell"></span>
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2130
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<pre style="margin: 0;"> <span id="LC2143" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">all_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fvs1</span> <span class="p">`</span><span class="n" style="color: #333;">plusFV</span><span class="p">`</span> <span class="n" style="color: #333;">fvs2</span> <span class="p">`</span><span class="n" style="color: #333;">plusFV</span><span class="p">`</span> <span class="n" style="color: #333;">fvs3</span></span>
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2131
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<pre style="margin: 0;">-<span id="LC2131" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">args'</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty'</span><span class="p">)</span></span>
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2132
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<pre style="margin: 0;">-<span id="LC2132" 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;">args</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC2133" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">InfixCon</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"rnConDecl"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">names</span><span class="p">)</span></span>
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2134
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<pre style="margin: 0;">-<span id="LC2134" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">RecCon</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">new_args</span><span class="p">,</span> <span class="n" style="color: #333;">new_res_ty</span><span class="p">)</span></span>
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2135
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<pre style="margin: 0;">-<span id="LC2135" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PrefixCon</span> <span class="n" style="color: #333;">as</span> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">arg_tys</span><span class="p">,</span> <span class="n" style="color: #333;">final_res_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitHsFunType</span> <span class="n" style="color: #333;">new_res_ty</span></span>
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2136
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<pre style="margin: 0;">-<span id="LC2136" 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;">null</span> <span class="n" style="color: #333;">as</span> <span class="p">)</span></span>
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2137
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<pre style="margin: 0;">-<span id="LC2137" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [GADT abstract syntax] in GHC.Hs.Decls</span></span>
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2138
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<pre style="margin: 0;">-<span id="LC2138" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PrefixCon</span> <span class="n" style="color: #333;">arg_tys</span><span class="p">,</span> <span class="n" style="color: #333;">final_res_ty</span><span class="p">)</span></span>
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2139
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2144
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<pre style="margin: 0;"> <span id="LC2144" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2145" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceRn</span> <span class="s" style="color: #d14;">"rnConDecl2"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">names</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">implicit_tkvs</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">explicit_tkvs</span><span class="p">)</span></span>
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2146
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<pre style="margin: 0;"> <span id="LC2146" 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;">decl</span> <span class="p">{</span> <span class="n" style="color: #333;">con_g_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implicit_tkvs</span><span class="p">,</span> <span class="n" style="color: #333;">con_names</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">new_names</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">@@ -2143,7 +2148,42 @@ rnConDecl decl@(ConDeclGADT { con_names = names</td>
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<pre style="margin: 0;"> <span id="LC2148" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">con_args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">args'</span><span class="p">,</span> <span class="n" style="color: #333;">con_res_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">res_ty'</span></span>
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<pre style="margin: 0;"> <span id="LC2149" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">con_doc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mb_doc'</span> <span class="p">},</span></span>
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<pre style="margin: 0;"> <span id="LC2150" class="line" lang="haskell"> <span class="n" style="color: #333;">all_fvs</span><span class="p">)</span> <span class="p">}</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC2146" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2151" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC2152" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Split the body of a prefix GADT constructor type into its argument</span></span>
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<pre style="margin: 0;">+<span id="LC2153" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- and result types. Furthermore, ensure that there are no nested `forall`s</span></span>
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<pre style="margin: 0;">+<span id="LC2154" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- or contexts, per</span></span>
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<pre style="margin: 0;">+<span id="LC2155" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [No nested foralls or contexts in GADT constructors] in</span></span>
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<pre style="margin: 0;">+<span id="LC2156" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- GHC.Parser.PostProcess.</span></span>
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<pre style="margin: 0;">+<span id="LC2157" class="line" lang="haskell"> <span class="n" style="color: #333;">split_prefix_gadt_ty</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsDocContext</span></span>
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<pre style="margin: 0;">+<span id="LC2158" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span></span>
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2159
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<pre style="margin: 0;">+<span id="LC2159" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RnM</span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">)</span></span>
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2160
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<pre style="margin: 0;">+<span id="LC2160" class="line" lang="haskell"> <span class="n" style="color: #333;">split_prefix_gadt_ty</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">gadt_rho</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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2161
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<pre style="margin: 0;">+<span id="LC2161" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">split_gadt_rho</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">gadt_res_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitHsFunType</span> <span class="n" style="color: #333;">gadt_rho</span></span>
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2162
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<pre style="margin: 0;">+<span id="LC2162" class="line" lang="haskell"></span>
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2163
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<pre style="margin: 0;">+<span id="LC2163" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Check for nested `forall`s or contexts</span></span>
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2164
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<pre style="margin: 0;">+<span id="LC2164" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">gadt_res_ty</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2165
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<pre style="margin: 0;">+<span id="LC2165" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">l</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsForAllTy</span> <span class="p">{</span> <span class="n" style="color: #333;">hst_fvf</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fvf</span> <span class="p">})</span></span>
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2166
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<pre style="margin: 0;">+<span id="LC2166" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ForallVis</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">fvf</span></span>
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2167
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<pre style="margin: 0;">+<span id="LC2167" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">setSrcSpan</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">addErr</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">withHsDocContext</span> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">vcat</span></span>
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2168
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<pre style="margin: 0;">+<span id="LC2168" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Illegal visible, dependent quantification"</span> <span class="o" style="font-weight: 600;"><+></span></span>
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2169
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<pre style="margin: 0;">+<span id="LC2169" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"in the type of a term"</span></span>
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2170
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<pre style="margin: 0;">+<span id="LC2170" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"(GHC does not yet support this)"</span> <span class="p">]</span></span>
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2171
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<pre style="margin: 0;">+<span id="LC2171" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ForallInvis</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">fvf</span></span>
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2172
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<pre style="margin: 0;">+<span id="LC2172" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">nested_foralls_contexts_err</span> <span class="n" style="color: #333;">l</span> <span class="n" style="color: #333;">ctxt</span></span>
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2173
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<pre style="margin: 0;">+<span id="LC2173" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">l</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsQualTy</span> <span class="p">{})</span></span>
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2174
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<pre style="margin: 0;">+<span id="LC2174" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">nested_foralls_contexts_err</span> <span class="n" style="color: #333;">l</span> <span class="n" style="color: #333;">ctxt</span></span>
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2175
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<pre style="margin: 0;">+<span id="LC2175" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="nb" style="color: #0086b3;">()</span></span>
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2176
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<pre style="margin: 0;">+<span id="LC2176" class="line" lang="haskell"></span>
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2177
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<pre style="margin: 0;">+<span id="LC2177" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">split_gadt_rho</span></span>
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2178
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<pre style="margin: 0;">+<span id="LC2178" class="line" lang="haskell"></span>
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2179
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<pre style="margin: 0;">+<span id="LC2179" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If we are going to reject a GADT constructor type for having nested</span></span>
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2180
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<pre style="margin: 0;">+<span id="LC2180" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- `forall`s or contexts, then we can at least suggest an alternative</span></span>
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2181
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<pre style="margin: 0;">+<span id="LC2181" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- way to write the type without nesting. (#12087)</span></span>
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2182
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<pre style="margin: 0;">+<span id="LC2182" class="line" lang="haskell"> <span class="n" style="color: #333;">nested_foralls_contexts_err</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SrcSpan</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsDocContext</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RnM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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2183
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<pre style="margin: 0;">+<span id="LC2183" class="line" lang="haskell"> <span class="n" style="color: #333;">nested_foralls_contexts_err</span> <span class="n" style="color: #333;">l</span> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;">=</span></span>
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2184
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<pre style="margin: 0;">+<span id="LC2184" class="line" lang="haskell"> <span class="n" style="color: #333;">setSrcSpan</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">addErr</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">withHsDocContext</span> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;">$</span></span>
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2185
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<pre style="margin: 0;">+<span id="LC2185" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"GADT constructor type signature cannot contain nested"</span></span>
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2186
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<pre style="margin: 0;">+<span id="LC2186" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="n" style="color: #333;">forAllLit</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"s or contexts"</span></span>
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2147
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2187
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<pre style="margin: 0;"> <span id="LC2187" class="line" lang="haskell"></span>
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2148
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2188
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<pre style="margin: 0;"> <span id="LC2188" class="line" lang="haskell"><span class="n" style="color: #333;">rnMbContext</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsDocContext</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsContext</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span><span class="p">)</span></span>
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2149
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2189
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<pre style="margin: 0;"> <span id="LC2189" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RnM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsContext</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">FreeVars</span><span class="p">)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/448cfdfb7c50463a092d35ea48c5b1a33eee3ba0#83d23a46bb6cdc8b1edc16f1fd2c8f5c53e2c9ca"><strong>compiler/GHC/Tc/TyCl.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">@@ -4720,50 +4720,12 @@ noClassTyVarErr clas fam_tc</td>
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<pre style="margin: 0;"> <span id="LC4720" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC4721" class="line" lang="haskell"><span class="n" style="color: #333;">badDataConTyCon</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DataCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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4722
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4722
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<pre style="margin: 0;"> <span id="LC4722" class="line" lang="haskell"><span class="n" style="color: #333;">badDataConTyCon</span> <span class="n" style="color: #333;">data_con</span> <span class="n" style="color: #333;">res_ty_tmpl</span></span>
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4723
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<pre style="margin: 0;">-<span id="LC4723" 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="n" style="color: #333;">tvs</span> <span class="p">)</span></span>
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4724
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<pre style="margin: 0;">-<span id="LC4724" class="line" lang="haskell"> <span class="n" style="color: #333;">tcIsForAllTy</span> <span class="n" style="color: #333;">actual_res_ty</span></span>
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4725
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<pre style="margin: 0;">-<span id="LC4725" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nested_foralls_contexts_suggestion</span></span>
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4726
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<pre style="margin: 0;">-<span id="LC4726" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isJust</span> <span class="p">(</span><span class="n" style="color: #333;">tcSplitPredFunTy_maybe</span> <span class="n" style="color: #333;">actual_res_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC4727" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nested_foralls_contexts_suggestion</span></span>
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<pre style="margin: 0;">-<span id="LC4728" 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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4723
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<pre style="margin: 0;"> <span id="LC4723" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Data constructor"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">data_con</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><+></span></span>
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4730
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<td class="diff-line-num new_line" data-linenumber="4724" 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">
4724
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<pre style="margin: 0;"> <span id="LC4724" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"returns type"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">actual_res_ty</span><span class="p">))</span></span>
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<td class="diff-line-num old_line" data-linenumber="4731" 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">
4731
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<td class="diff-line-num new_line" data-linenumber="4725" 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">
4725
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<pre style="margin: 0;"> <span id="LC4725" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"instead of an instance of its parent type"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">res_ty_tmpl</span><span class="p">))</span></span>
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4732
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<td class="diff-line-num new_line" data-linenumber="4726" 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">
4726
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<pre style="margin: 0;"> <span id="LC4726" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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4733
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<td class="diff-line-num new_line" data-linenumber="4727" 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">
4727
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<pre style="margin: 0;"> <span id="LC4727" class="line" lang="haskell"> <span class="n" style="color: #333;">actual_res_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dataConOrigResTy</span> <span class="n" style="color: #333;">data_con</span></span>
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4734
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<td class="diff-line-num new_line" data-linenumber="4728" 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">
4728
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<pre style="margin: 0;"> <span id="LC4728" class="line" lang="haskell"></span>
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4735
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<td class="diff-line-num new_line old" data-linenumber="4729" 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="LC4735" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This suggestion is useful for suggesting how to correct code like what</span></span>
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<td class="diff-line-num old old_line" data-linenumber="4736" 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">
4736
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<td class="diff-line-num new_line old" data-linenumber="4729" 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="LC4736" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- was reported in #12087:</span></span>
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4737
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<pre style="margin: 0;">-<span id="LC4737" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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4738
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<td class="diff-line-num new_line old" data-linenumber="4729" 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="LC4738" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- data F a where</span></span>
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4739
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<pre style="margin: 0;">-<span id="LC4739" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- MkF :: Ord a => Eq a => a -> F a</span></span>
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4740
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<pre style="margin: 0;">-<span id="LC4740" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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4741
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<td class="diff-line-num new_line old" data-linenumber="4729" 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="LC4741" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Although nested foralls or contexts are allowed in function type</span></span>
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4742
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<pre style="margin: 0;">-<span id="LC4742" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- signatures, it is much more difficult to engineer GADT constructor type</span></span>
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4743
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<pre style="margin: 0;">-<span id="LC4743" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- signatures to allow something similar, so we error in the latter case.</span></span>
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4744
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<td class="diff-line-num new_line old" data-linenumber="4729" 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="LC4744" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Nevertheless, we can at least suggest how a user might reshuffle their</span></span>
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4745
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<pre style="margin: 0;">-<span id="LC4745" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- exotic GADT constructor type signature so that GHC will accept.</span></span>
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4746
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<pre style="margin: 0;">-<span id="LC4746" class="line" lang="haskell"> <span class="n" style="color: #333;">nested_foralls_contexts_suggestion</span> <span class="o" style="font-weight: 600;">=</span></span>
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4747
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<pre style="margin: 0;">-<span id="LC4747" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"GADT constructor type signature cannot contain nested"</span></span>
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4748
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<pre style="margin: 0;">-<span id="LC4748" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="n" style="color: #333;">forAllLit</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"s or contexts"</span></span>
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4749
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<pre style="margin: 0;">-<span id="LC4749" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$+$</span> <span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Suggestion: instead use this type signature:"</span><span class="p">)</span></span>
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<td class="diff-line-num old old_line" data-linenumber="4750" 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">
4750
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<pre style="margin: 0;">-<span id="LC4750" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">dataConName</span> <span class="n" style="color: #333;">data_con</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">suggested_ty</span><span class="p">)</span></span>
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4751
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<pre style="margin: 0;">-<span id="LC4751" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC4752" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- To construct a type that GHC would accept (suggested_ty), we:</span></span>
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4753
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<pre style="margin: 0;">-<span id="LC4753" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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4754
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<pre style="margin: 0;">-<span id="LC4754" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 1) Find the existentially quantified type variables and the class</span></span>
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4755
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<pre style="margin: 0;">-<span id="LC4755" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- predicates from the datacon. (NB: We don't need the universally</span></span>
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4756
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<pre style="margin: 0;">-<span id="LC4756" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- quantified type variables, since rejigConRes won't substitute them in</span></span>
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4757
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<pre style="margin: 0;">-<span id="LC4757" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the result type if it fails, as in this scenario.)</span></span>
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4758
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<pre style="margin: 0;">-<span id="LC4758" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 2) Split apart the return type (which is headed by a forall or a</span></span>
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4759
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<pre style="margin: 0;">-<span id="LC4759" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- context) using tcSplitNestedSigmaTys, collecting the type variables</span></span>
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4760
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<pre style="margin: 0;">-<span id="LC4760" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- and class predicates we find, as well as the rho type lurking</span></span>
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4761
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<pre style="margin: 0;">-<span id="LC4761" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- underneath the nested foralls and contexts.</span></span>
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4762
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<pre style="margin: 0;">-<span id="LC4762" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 3) Smash together the type variables and class predicates from 1) and</span></span>
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4763
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<pre style="margin: 0;">-<span id="LC4763" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 2), and prepend them to the rho type from 2).</span></span>
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<pre style="margin: 0;">-<span id="LC4764" 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;">rho</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcSplitNestedSigmaTys</span> <span class="p">(</span><span class="n" style="color: #333;">dataConUserType</span> <span class="n" style="color: #333;">data_con</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC4765" class="line" lang="haskell"> <span class="n" style="color: #333;">suggested_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkSpecSigmaTy</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">theta</span> <span class="n" style="color: #333;">rho</span></span>
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<pre style="margin: 0;">-<span id="LC4766" class="line" lang="haskell"></span>
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4729
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<pre style="margin: 0;"> <span id="LC4729" class="line" lang="haskell"><span class="n" style="color: #333;">badGadtDecl</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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4730
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<pre style="margin: 0;"> <span id="LC4730" class="line" lang="haskell"><span class="n" style="color: #333;">badGadtDecl</span> <span class="n" style="color: #333;">tc_name</span></span>
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4769
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4731
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<pre style="margin: 0;"> <span id="LC4731" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Illegal generalised algebraic data declaration for"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tc_name</span><span class="p">)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/448cfdfb7c50463a092d35ea48c5b1a33eee3ba0#2eac51f9871ca0c0698aa1fc7f79c05ef8fc4a49"><strong>compiler/GHC/ThToHs.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">@@ -619,7 +619,7 @@ cvtConstr (GadtC c strtys ty)</td>
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<pre style="margin: 0;"> <span id="LC619" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">cvt_arg</span> <span class="n" style="color: #333;">strtys</span></span>
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<pre style="margin: 0;"> <span id="LC620" class="line" lang="haskell"> <span class="p">;</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ty'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">cvtType</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC621" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">c_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mk_arr_apps</span> <span class="n" style="color: #333;">args</span> <span class="n" style="color: #333;">ty'</span></span>
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<pre style="margin: 0;">-<span id="LC622" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">returnL</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;"><span class="idiff left">fst</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">mkGadtDecl</span> <span class="n" style="color: #333;">c'</span> <span class="n" style="color: #333;">c_ty</span><span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC622" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">returnL</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkGadtDecl</span> <span class="n" style="color: #333;">c'</span> <span class="n" style="color: #333;">c_ty</span><span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC623" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC624" class="line" lang="haskell"><span class="n" style="color: #333;">cvtConstr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RecGadtC</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">_varstrtys</span> <span class="n" style="color: #333;">_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC625" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">failWith</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"RecGadtC must have at least one constructor name"</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">@@ -630,7 +630,7 @@ cvtConstr (RecGadtC c varstrtys ty)</td>
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<pre style="margin: 0;"> <span id="LC630" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rec_flds</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">cvt_id_arg</span> <span class="n" style="color: #333;">varstrtys</span></span>
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<pre style="margin: 0;"> <span id="LC631" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">rec_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">noLoc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsFunTy</span> <span class="n" style="color: #333;">noExtField</span></span>
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<pre style="margin: 0;"> <span id="LC632" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">noLoc</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">HsRecTy</span> <span class="n" style="color: #333;">noExtField</span> <span class="n" style="color: #333;">rec_flds</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="LC633" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">returnL</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;"><span class="idiff left">fst</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">mkGadtDecl</span> <span class="n" style="color: #333;">c'</span> <span class="n" style="color: #333;">rec_ty</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC633" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">returnL</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkGadtDecl</span> <span class="n" style="color: #333;">c'</span> <span class="n" style="color: #333;">rec_ty</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC634" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC635" class="line" lang="haskell"><span class="n" style="color: #333;">cvtSrcUnpackedness</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TH</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">SourceUnpackedness</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SrcUnpackedness</span></span>
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<pre style="margin: 0;"> <span id="LC636" class="line" lang="haskell"><span class="n" style="color: #333;">cvtSrcUnpackedness</span> <span class="kt" style="color: #458; font-weight: 600;">NoSourceUnpackedness</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoSrcUnpack</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">@@ -95,7 +95,28 @@ Language</td>
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<pre style="margin: 0;"> <span id="LC95" class="line" lang="plaintext"> effectively allows users to choose which variables can or can't be</span>
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<pre style="margin: 0;"> <span id="LC96" class="line" lang="plaintext"> instantiated through visible type application. More information can be found</span>
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<pre style="margin: 0;"> <span id="LC97" class="line" lang="plaintext"> here: :ref:`Manually-defining-inferred-variables`.</span>
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<pre style="margin: 0;">-<span id="LC98" class="line" lang="plaintext"> </span>
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<pre style="margin: 0;">+<span id="LC98" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC99" class="line" lang="plaintext">* GADT constructor types now properly adhere to :ref:`forall-or-nothing`. As</span>
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<pre style="margin: 0;">+<span id="LC100" class="line" lang="plaintext"> a result, GHC will now reject some GADT constructors that previous versions</span>
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<pre style="margin: 0;">+<span id="LC101" class="line" lang="plaintext"> of GHC would accept, such as the following: ::</span>
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<pre style="margin: 0;">+<span id="LC102" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC103" class="line" lang="plaintext"> data T where</span>
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<pre style="margin: 0;">+<span id="LC104" class="line" lang="plaintext"> MkT1 :: (forall a. a -> b -> T)</span>
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<pre style="margin: 0;">+<span id="LC105" class="line" lang="plaintext"> MkT2 :: (forall a. a -> T)</span>
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<pre style="margin: 0;">+<span id="LC106" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC107" class="line" lang="plaintext"> ``MkT1`` and ``MkT2`` are rejected because the lack of an outermost</span>
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<pre style="margin: 0;">+<span id="LC108" class="line" lang="plaintext"> ``forall`` triggers implicit quantification, making the explicit ``forall``s</span>
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<pre style="margin: 0;">+<span id="LC109" class="line" lang="plaintext"> nested. Furthermore, GADT constructors do not permit the use of nested</span>
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<pre style="margin: 0;">+<span id="LC110" class="line" lang="plaintext"> ``forall``s, as explained in :ref:`formal-gadt-syntax`.</span>
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<pre style="margin: 0;">+<span id="LC111" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC112" class="line" lang="plaintext"> In addition to rejecting nested ``forall``s, GHC is now more stringent about</span>
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<pre style="margin: 0;">+<span id="LC113" class="line" lang="plaintext"> rejecting uses of nested *contexts* in GADT constructors. For example, the</span>
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<pre style="margin: 0;">+<span id="LC114" class="line" lang="plaintext"> following example, which previous versions of GHC would accept, is now</span>
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<pre style="margin: 0;">+<span id="LC115" class="line" lang="plaintext"> rejected:</span>
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<pre style="margin: 0;">+<span id="LC116" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC117" class="line" lang="plaintext"> data U a where</span>
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<pre style="margin: 0;">+<span id="LC118" class="line" lang="plaintext"> MkU :: (Show a => U a)</span>
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<pre style="margin: 0;">+<span id="LC119" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC120" class="line" lang="plaintext">Compiler</span>
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<pre style="margin: 0;"> <span id="LC121" class="line" lang="plaintext">~~~~~~~~</span>
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<pre style="margin: 0;"> <span id="LC122" class="line" lang="plaintext"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/448cfdfb7c50463a092d35ea48c5b1a33eee3ba0#afd1105d8e32dc50acf9fc381b4433a3bcd009cf"><strong>docs/users_guide/exts/explicit_forall.rst</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -45,4 +45,81 @@ Notes:</td>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="plaintext"> would warn about the unused type variable `a`.</span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="plaintext">.. _forall-or-nothing:</span>
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<pre style="margin: 0;">+<span id="LC49" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC50" class="line" lang="plaintext">The ``forall``-or-nothing rule</span>
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<pre style="margin: 0;">+<span id="LC51" class="line" lang="plaintext">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span>
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<pre style="margin: 0;">+<span id="LC52" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC53" class="line" lang="plaintext">In certain forms of types, type variables obey what is known as the</span>
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<pre style="margin: 0;">+<span id="LC54" class="line" lang="plaintext">"``forall``-or-nothing" rule: if a type has an outermost, explicit</span>
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<pre style="margin: 0;">+<span id="LC55" class="line" lang="plaintext">``forall``, then all of the type variables in the type must be explicitly</span>
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<pre style="margin: 0;">+<span id="LC56" class="line" lang="plaintext">quantified. These two examples illustrate how the rule works: ::</span>
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<pre style="margin: 0;">+<span id="LC57" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC58" class="line" lang="plaintext"> f :: forall a b. a -> b -> b -- OK, `a` and `b` are explicitly bound</span>
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<pre style="margin: 0;">+<span id="LC59" class="line" lang="plaintext"> g :: forall a. a -> forall b. b -> b -- OK, `a` and `b` are explicitly bound</span>
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<pre style="margin: 0;">+<span id="LC60" class="line" lang="plaintext"> h :: forall a. a -> b -> b -- Rejected, `b` is not in scope</span>
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<pre style="margin: 0;">+<span id="LC61" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC62" class="line" lang="plaintext">The type signatures for ``f``, ``g``, and ``h`` all begin with an outermost</span>
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<pre style="margin: 0;">+<span id="LC63" class="line" lang="plaintext">``forall``, so every type variable in these signatures must be explicitly</span>
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<pre style="margin: 0;">+<span id="LC64" class="line" lang="plaintext">bound by a ``forall``. Both ``f`` and ``g`` obey the ``forall``-or-nothing</span>
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<pre style="margin: 0;">+<span id="LC65" class="line" lang="plaintext">rule, since they explicitly quantify ``a`` and ``b``. On the other hand,</span>
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<pre style="margin: 0;">+<span id="LC66" class="line" lang="plaintext">``h`` does not explicitly quantify ``b``, so GHC will reject its type</span>
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<pre style="margin: 0;">+<span id="LC67" class="line" lang="plaintext">signature for being improperly scoped.</span>
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<pre style="margin: 0;">+<span id="LC68" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC69" class="line" lang="plaintext">In places where the ``forall``-or-nothing rule takes effect, if a type does</span>
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<pre style="margin: 0;">+<span id="LC70" class="line" lang="plaintext">*not* have an outermost ``forall``, then any type variables that are not</span>
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<pre style="margin: 0;">+<span id="LC71" class="line" lang="plaintext">explicitly bound by a ``forall`` become implicitly quantified. For example: ::</span>
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<pre style="margin: 0;">+<span id="LC72" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC73" class="line" lang="plaintext"> i :: a -> b -> b -- `a` and `b` are implicitly quantified</span>
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74
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<pre style="margin: 0;">+<span id="LC74" class="line" lang="plaintext"> j :: a -> forall b. b -> b -- `a` is implicitly quantified</span>
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75
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<pre style="margin: 0;">+<span id="LC75" class="line" lang="plaintext"> k :: (forall a. a -> b -> b) -- `b` is implicitly quantified</span>
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76
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<pre style="margin: 0;">+<span id="LC76" class="line" lang="plaintext"></span>
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77
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<pre style="margin: 0;">+<span id="LC77" class="line" lang="plaintext">GHC will accept ``i``, ``j``, and ``k``'s type signatures. Note that:</span>
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78
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<pre style="margin: 0;">+<span id="LC78" class="line" lang="plaintext"></span>
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79
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<pre style="margin: 0;">+<span id="LC79" class="line" lang="plaintext">- ``j``'s signature is accepted despite its mixture of implicit and explicit</span>
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80
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<pre style="margin: 0;">+<span id="LC80" class="line" lang="plaintext"> quantification. As long as a ``forall`` is not an outermost one, it is fine</span>
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81
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<pre style="margin: 0;">+<span id="LC81" class="line" lang="plaintext"> to use it among implicitly bound type variables.</span>
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82
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<pre style="margin: 0;">+<span id="LC82" class="line" lang="plaintext">- ``k``'s signature is accepted because the outermost parentheses imply that</span>
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83
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<pre style="margin: 0;">+<span id="LC83" class="line" lang="plaintext"> the ``forall`` is not an outermost ``forall``. The ``forall``-or-nothing</span>
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84
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<pre style="margin: 0;">+<span id="LC84" class="line" lang="plaintext"> rule is one of the few places in GHC where the presence or absence of</span>
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85
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<pre style="margin: 0;">+<span id="LC85" class="line" lang="plaintext"> parentheses can be semantically significant!</span>
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86
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<pre style="margin: 0;">+<span id="LC86" class="line" lang="plaintext"></span>
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87
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<pre style="margin: 0;">+<span id="LC87" class="line" lang="plaintext">The ``forall``-or-nothing rule takes effect in the following places:</span>
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88
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<pre style="margin: 0;">+<span id="LC88" class="line" lang="plaintext"></span>
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89
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<pre style="margin: 0;">+<span id="LC89" class="line" lang="plaintext">- Type signature declarations for functions, values, and class methods</span>
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90
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<pre style="margin: 0;">+<span id="LC90" class="line" lang="plaintext">- Expression type annotations</span>
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91
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<pre style="margin: 0;">+<span id="LC91" class="line" lang="plaintext">- Instance declarations</span>
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92
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<pre style="margin: 0;">+<span id="LC92" class="line" lang="plaintext">- :ref:`class-default-signatures`</span>
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93
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<pre style="margin: 0;">+<span id="LC93" class="line" lang="plaintext">- Type signatures in a :ref:`specialize-pragma` or</span>
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94
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<pre style="margin: 0;">+<span id="LC94" class="line" lang="plaintext"> :ref:`specialize-instance-pragma`</span>
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95
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<pre style="margin: 0;">+<span id="LC95" class="line" lang="plaintext">- :ref:`standalone-kind-signatures`</span>
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96
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<pre style="margin: 0;">+<span id="LC96" class="line" lang="plaintext">- Type signatures for :ref:`gadt` constructors</span>
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97
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<pre style="margin: 0;">+<span id="LC97" class="line" lang="plaintext">- Type signatures for :ref:`pattern-synonyms`</span>
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<pre style="margin: 0;">+<span id="LC98" class="line" lang="plaintext">- :ref:`data-instance-declarations`, :ref:`type-instance-declarations`,</span>
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<pre style="margin: 0;">+<span id="LC99" class="line" lang="plaintext"> :ref:`closed-type-families`, and :ref:`assoc-inst`</span>
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<pre style="margin: 0;">+<span id="LC100" class="line" lang="plaintext">- :ref:`rewrite-rules` in which the type variables are explicitly quantified</span>
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<pre style="margin: 0;"> <span id="LC101" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC102" class="line" lang="plaintext">Notes:</span>
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<pre style="margin: 0;">+<span id="LC103" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC104" class="line" lang="plaintext">- :ref:`pattern-type-sigs` are a notable example of a place where</span>
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<pre style="margin: 0;">+<span id="LC105" class="line" lang="plaintext"> types do *not* obey the ``forall``-or-nothing rule. For example, GHC will</span>
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<pre style="margin: 0;">+<span id="LC106" class="line" lang="plaintext"> accept the following: ::</span>
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<pre style="margin: 0;">+<span id="LC107" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC108" class="line" lang="plaintext"> f (g :: forall a. a -> b) x = g x :: b</span>
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<pre style="margin: 0;">+<span id="LC109" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC110" class="line" lang="plaintext"> Furthermore, :ref:`rewrite-rules` do not obey the ``forall``-or-nothing rule</span>
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<pre style="margin: 0;">+<span id="LC111" class="line" lang="plaintext"> when their type variables are not explicitly quantified: ::</span>
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<pre style="margin: 0;">+<span id="LC112" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC113" class="line" lang="plaintext"> {-# RULES "f" forall (g :: forall a. a -> b) x. f g x = g x :: b #-}</span>
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<pre style="margin: 0;">+<span id="LC114" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC115" class="line" lang="plaintext">- GADT constructors are extra particular about their ``forall``s. In addition</span>
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<pre style="margin: 0;">+<span id="LC116" class="line" lang="plaintext"> to adhering to the ``forall``-or-nothing rule, GADT constructors also forbid</span>
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<pre style="margin: 0;">+<span id="LC117" class="line" lang="plaintext"> nested ``forall``s. For example, GHC would reject the following GADT: ::</span>
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<pre style="margin: 0;">+<span id="LC118" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC119" class="line" lang="plaintext"> data T where</span>
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<pre style="margin: 0;">+<span id="LC120" class="line" lang="plaintext"> MkT :: (forall a. a -> b -> T)</span>
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<pre style="margin: 0;">+<span id="LC121" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC122" class="line" lang="plaintext"> Because of the lack of an outermost ``forall`` in the type of ``MkT``, the</span>
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<pre style="margin: 0;">+<span id="LC123" class="line" lang="plaintext"> ``b`` would be implicitly quantified. In effect, it would be as if one had</span>
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<pre style="margin: 0;">+<span id="LC124" class="line" lang="plaintext"> written ``MkT :: forall b. (forall a. a -> b -> T)``, which contains nested</span>
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<pre style="margin: 0;">+<span id="LC125" class="line" lang="plaintext"> ``forall``s. See :ref:`formal-gadt-syntax`.</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/448cfdfb7c50463a092d35ea48c5b1a33eee3ba0#0cc784483e34410e9b43b5cfc23ee304faba81d1"><strong>docs/users_guide/exts/gadt_syntax.rst</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">@@ -103,6 +103,123 @@ implements this behaviour, odd though it is. But for GADT-style</td>
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<pre style="margin: 0;"> <span id="LC103" class="line" lang="plaintext">declarations, GHC's behaviour is much more useful, as well as much more</span>
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<pre style="margin: 0;"> <span id="LC104" class="line" lang="plaintext">intuitive.</span>
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<pre style="margin: 0;"> <span id="LC105" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC106" class="line" lang="plaintext">.. _formal-gadt-syntax:</span>
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<pre style="margin: 0;">+<span id="LC107" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC108" class="line" lang="plaintext">Formal syntax for GADTs</span>
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<pre style="margin: 0;">+<span id="LC109" class="line" lang="plaintext">~~~~~~~~~~~~~~~~~~~~~~~</span>
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<pre style="margin: 0;">+<span id="LC110" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC111" class="line" lang="plaintext">To make more precise what is and what is not permitted inside of a GADT-style</span>
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<pre style="margin: 0;">+<span id="LC112" class="line" lang="plaintext">constructor, we provide a BNF-style grammar for GADT below. Note that this</span>
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<pre style="margin: 0;">+<span id="LC113" class="line" lang="plaintext">grammar is subject to change in the future. ::</span>
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<pre style="margin: 0;">+<span id="LC114" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC115" class="line" lang="plaintext"> gadt_con ::= conids '::' opt_forall opt_ctxt gadt_body</span>
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<pre style="margin: 0;">+<span id="LC117" class="line" lang="plaintext"> conids ::= conid</span>
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<pre style="margin: 0;">+<span id="LC118" class="line" lang="plaintext"> | conid ',' conids</span>
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<pre style="margin: 0;">+<span id="LC120" class="line" lang="plaintext"> opt_forall ::= <empty></span>
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<pre style="margin: 0;">+<span id="LC121" class="line" lang="plaintext"> | 'forall' tv_bndrs '.'</span>
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<pre style="margin: 0;">+<span id="LC123" class="line" lang="plaintext"> tv_bndrs ::= <empty></span>
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<pre style="margin: 0;">+<span id="LC124" class="line" lang="plaintext"> | tv_bndr tv_bndrs</span>
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125
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<pre style="margin: 0;">+<span id="LC125" class="line" lang="plaintext"></span>
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126
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<pre style="margin: 0;">+<span id="LC126" class="line" lang="plaintext"> tv_bndr ::= tyvar</span>
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127
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<pre style="margin: 0;">+<span id="LC127" class="line" lang="plaintext"> | '(' tyvar '::' ctype ')'</span>
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128
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<pre style="margin: 0;">+<span id="LC128" class="line" lang="plaintext"></span>
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129
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<pre style="margin: 0;">+<span id="LC129" class="line" lang="plaintext"> opt_ctxt ::= <empty></span>
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130
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<pre style="margin: 0;">+<span id="LC130" class="line" lang="plaintext"> | btype '=>'</span>
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131
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<pre style="margin: 0;">+<span id="LC131" class="line" lang="plaintext"> | '(' ctxt ')' '=>'</span>
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132
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<pre style="margin: 0;">+<span id="LC132" class="line" lang="plaintext"></span>
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133
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<pre style="margin: 0;">+<span id="LC133" class="line" lang="plaintext"> ctxt ::= ctype</span>
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134
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<pre style="margin: 0;">+<span id="LC134" class="line" lang="plaintext"> | ctype ',' ctxt</span>
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135
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<pre style="margin: 0;">+<span id="LC135" class="line" lang="plaintext"></span>
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136
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<pre style="margin: 0;">+<span id="LC136" class="line" lang="plaintext"> gadt_body ::= prefix_gadt_body</span>
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137
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<pre style="margin: 0;">+<span id="LC137" class="line" lang="plaintext"> | record_gadt_body</span>
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138
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<pre style="margin: 0;">+<span id="LC138" class="line" lang="plaintext"></span>
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139
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<pre style="margin: 0;">+<span id="LC139" class="line" lang="plaintext"> prefix_gadt_body ::= '(' prefix_gadt_body ')'</span>
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140
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<pre style="margin: 0;">+<span id="LC140" class="line" lang="plaintext"> | return_type</span>
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141
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<pre style="margin: 0;">+<span id="LC141" class="line" lang="plaintext"> | opt_unpack btype '->' prefix_gadt_body</span>
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142
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<pre style="margin: 0;">+<span id="LC142" class="line" lang="plaintext"></span>
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143
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<pre style="margin: 0;">+<span id="LC143" class="line" lang="plaintext"> record_gadt_body ::= '{' fieldtypes '}' '->' return_type</span>
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144
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<pre style="margin: 0;">+<span id="LC144" class="line" lang="plaintext"></span>
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145
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<pre style="margin: 0;">+<span id="LC145" class="line" lang="plaintext"> fieldtypes ::= <empty></span>
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146
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<pre style="margin: 0;">+<span id="LC146" class="line" lang="plaintext"> | fieldnames '::' opt_unpack ctype</span>
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147
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<pre style="margin: 0;">+<span id="LC147" class="line" lang="plaintext"> | fieldnames '::' opt_unpack ctype ',' fieldtypes</span>
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148
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<pre style="margin: 0;">+<span id="LC148" class="line" lang="plaintext"></span>
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149
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<pre style="margin: 0;">+<span id="LC149" class="line" lang="plaintext"> fieldnames ::= fieldname</span>
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150
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<pre style="margin: 0;">+<span id="LC150" class="line" lang="plaintext"> | fieldname ',' fieldnames</span>
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151
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<pre style="margin: 0;">+<span id="LC151" class="line" lang="plaintext"></span>
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152
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<pre style="margin: 0;">+<span id="LC152" class="line" lang="plaintext"> opt_unpack ::= opt_bang</span>
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153
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<pre style="margin: 0;">+<span id="LC153" class="line" lang="plaintext"> : {-# UNPACK #-} opt_bang</span>
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154
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<pre style="margin: 0;">+<span id="LC154" class="line" lang="plaintext"> | {-# NOUNPACK #-} opt_bang</span>
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155
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<pre style="margin: 0;">+<span id="LC155" class="line" lang="plaintext"></span>
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156
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<pre style="margin: 0;">+<span id="LC156" class="line" lang="plaintext"> opt_bang ::= <empty></span>
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157
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<pre style="margin: 0;">+<span id="LC157" class="line" lang="plaintext"> | '!'</span>
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158
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<pre style="margin: 0;">+<span id="LC158" class="line" lang="plaintext"> | '~'</span>
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159
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<pre style="margin: 0;">+<span id="LC159" class="line" lang="plaintext"></span>
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160
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<pre style="margin: 0;">+<span id="LC160" class="line" lang="plaintext">Where:</span>
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161
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<pre style="margin: 0;">+<span id="LC161" class="line" lang="plaintext"></span>
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162
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<pre style="margin: 0;">+<span id="LC162" class="line" lang="plaintext">- ``btype`` is a type that is not allowed to have an outermost</span>
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163
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<pre style="margin: 0;">+<span id="LC163" class="line" lang="plaintext"> ``forall``/``=>`` unless it is surrounded by parentheses. For example,</span>
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164
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<pre style="margin: 0;">+<span id="LC164" class="line" lang="plaintext"> ``forall a. a`` and ``Eq a => a`` are not legal ``btype``s, but</span>
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165
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<pre style="margin: 0;">+<span id="LC165" class="line" lang="plaintext"> ``(forall a. a)`` and ``(Eq a => a)`` are legal.</span>
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166
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<pre style="margin: 0;">+<span id="LC166" class="line" lang="plaintext">- ``ctype`` is a ``btype`` that has no restrictions on an outermost</span>
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167
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<pre style="margin: 0;">+<span id="LC167" class="line" lang="plaintext"> ``forall``/``=>``, so ``forall a. a`` and ``Eq a => a`` are legal ``ctype``s.</span>
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168
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<pre style="margin: 0;">+<span id="LC168" class="line" lang="plaintext">- ``return_type`` is a type that is not allowed to have ``forall``s, ``=>``s,</span>
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169
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<pre style="margin: 0;">+<span id="LC169" class="line" lang="plaintext"> or ``->``s.</span>
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170
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<pre style="margin: 0;">+<span id="LC170" class="line" lang="plaintext"></span>
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171
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<pre style="margin: 0;">+<span id="LC171" class="line" lang="plaintext">This is a simplified grammar that does not fully delve into all of the</span>
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172
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<pre style="margin: 0;">+<span id="LC172" class="line" lang="plaintext">implementation details of GHC's parser (such as the placement of Haddock</span>
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173
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<pre style="margin: 0;">+<span id="LC173" class="line" lang="plaintext">comments), but it is sufficient to attain an understanding of what is</span>
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<td class="diff-line-num new new_line" data-linenumber="174" 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">
174
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<pre style="margin: 0;">+<span id="LC174" class="line" lang="plaintext">syntactically allowed. Some further various observations about this grammar:</span>
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175
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<pre style="margin: 0;">+<span id="LC175" class="line" lang="plaintext"></span>
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176
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<pre style="margin: 0;">+<span id="LC176" class="line" lang="plaintext">- GADT constructor types are currently not permitted to have nested ``forall``s</span>
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177
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<pre style="margin: 0;">+<span id="LC177" class="line" lang="plaintext"> or ``=>``s. (e.g., something like ``MkT :: Int -> forall a. a -> T`` would be</span>
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178
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<pre style="margin: 0;">+<span id="LC178" class="line" lang="plaintext"> rejected.) As a result, ``gadt_sig`` puts all of its quantification and</span>
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179
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<pre style="margin: 0;">+<span id="LC179" class="line" lang="plaintext"> constraints up front with ``opt_forall`` and ``opt_context``. Note that</span>
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180
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<pre style="margin: 0;">+<span id="LC180" class="line" lang="plaintext"> higher-rank ``forall``s and ``=>``s are only permitted if they do not appear</span>
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181
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<pre style="margin: 0;">+<span id="LC181" class="line" lang="plaintext"> directly to the right of a function arrow in a `prefix_gadt_body`. (e.g.,</span>
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182
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<pre style="margin: 0;">+<span id="LC182" class="line" lang="plaintext"> something like ``MkS :: Int -> (forall a. a) -> S`` is allowed, since</span>
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183
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<pre style="margin: 0;">+<span id="LC183" class="line" lang="plaintext"> parentheses separate the ``forall`` from the ``->``.)</span>
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184
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<pre style="margin: 0;">+<span id="LC184" class="line" lang="plaintext">- Furthermore, GADT constructors do not permit outermost parentheses that</span>
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185
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<pre style="margin: 0;">+<span id="LC185" class="line" lang="plaintext"> surround the ``opt_forall`` or ``opt_ctxt``, if at least one of them are</span>
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186
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<pre style="margin: 0;">+<span id="LC186" class="line" lang="plaintext"> used. For example, ``MkU :: (forall a. a -> U)`` would be rejected, since</span>
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187
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<pre style="margin: 0;">+<span id="LC187" class="line" lang="plaintext"> it would treat the ``forall`` as being nested.</span>
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188
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<pre style="margin: 0;">+<span id="LC188" class="line" lang="plaintext"></span>
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189
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<pre style="margin: 0;">+<span id="LC189" class="line" lang="plaintext"> Note that it is acceptable to use parentheses in a ``prefix_gadt_body``.</span>
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190
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<pre style="margin: 0;">+<span id="LC190" class="line" lang="plaintext"> For instance, ``MkV1 :: forall a. (a) -> (V1)`` is acceptable, as is</span>
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191
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<pre style="margin: 0;">+<span id="LC191" class="line" lang="plaintext"> ``MkV2 :: forall a. (a -> V2)``.</span>
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192
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<pre style="margin: 0;">+<span id="LC192" class="line" lang="plaintext">- The function arrows in a ``prefix_gadt_body``, as well as the function</span>
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193
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<pre style="margin: 0;">+<span id="LC193" class="line" lang="plaintext"> arrow in a ``record_gadt_body``, are required to be used infix. For</span>
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194
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<pre style="margin: 0;">+<span id="LC194" class="line" lang="plaintext"> example, ``MkA :: (->) Int A`` would be rejected.</span>
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195
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<pre style="margin: 0;">+<span id="LC195" class="line" lang="plaintext">- GHC uses the function arrows in a ``prefix_gadt_body`` and</span>
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196
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<pre style="margin: 0;">+<span id="LC196" class="line" lang="plaintext"> ``prefix_gadt_body`` to syntactically demarcate the function and result</span>
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197
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<pre style="margin: 0;">+<span id="LC197" class="line" lang="plaintext"> types. Note that GHC does not attempt to be clever about looking through</span>
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198
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<pre style="margin: 0;">+<span id="LC198" class="line" lang="plaintext"> type synonyms here. If you attempt to do this, for instance: ::</span>
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199
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<pre style="margin: 0;">+<span id="LC199" class="line" lang="plaintext"></span>
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200
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<pre style="margin: 0;">+<span id="LC200" class="line" lang="plaintext"> type C = Int -> B</span>
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201
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<pre style="margin: 0;">+<span id="LC201" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC202" class="line" lang="plaintext"> data B where</span>
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<pre style="margin: 0;">+<span id="LC203" class="line" lang="plaintext"> MkB :: C</span>
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<pre style="margin: 0;">+<span id="LC204" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC205" class="line" lang="plaintext"> Then GHC will interpret the return type of ``MkB`` to be ``C``, and since</span>
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<pre style="margin: 0;">+<span id="LC206" class="line" lang="plaintext"> GHC requires that the return type must be headed by ``B``, this will be</span>
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<pre style="margin: 0;">+<span id="LC207" class="line" lang="plaintext"> rejected. On the other hand, it is acceptable to use type synonyms within</span>
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<pre style="margin: 0;">+<span id="LC208" class="line" lang="plaintext"> the argument and result types themselves, so the following is permitted: ::</span>
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<pre style="margin: 0;">+<span id="LC209" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC210" class="line" lang="plaintext"> type B1 = Int</span>
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<pre style="margin: 0;">+<span id="LC211" class="line" lang="plaintext"> type B2 = B</span>
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<pre style="margin: 0;">+<span id="LC212" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC213" class="line" lang="plaintext"> data B where</span>
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<pre style="margin: 0;">+<span id="LC214" class="line" lang="plaintext"> MkB :: B1 -> B2</span>
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<pre style="margin: 0;">+<span id="LC215" class="line" lang="plaintext">- GHC will accept any combination of ``!``/``~`` and</span>
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<pre style="margin: 0;">+<span id="LC216" class="line" lang="plaintext"> ``{-# UNPACK #-}``/``{-# NOUNPACK #-}``, although GHC will ignore some</span>
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<pre style="margin: 0;">+<span id="LC217" class="line" lang="plaintext"> combinations. For example, GHC will produce a warning if you write</span>
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<pre style="margin: 0;">+<span id="LC218" class="line" lang="plaintext"> ``{-# UNPACK #-} ~Int`` and proceed as if you had written ``Int``.</span>
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<pre style="margin: 0;">+<span id="LC219" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC220" class="line" lang="plaintext">GADT syntax odds and ends</span>
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<pre style="margin: 0;">+<span id="LC221" class="line" lang="plaintext">~~~~~~~~~~~~~~~~~~~~~~~~~</span>
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<pre style="margin: 0;">+<span id="LC222" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC223" class="line" lang="plaintext">The rest of this section gives further details about GADT-style data</span>
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<pre style="margin: 0;"> <span id="LC224" class="line" lang="plaintext">type declarations.</span>
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<pre style="margin: 0;"> <span id="LC225" class="line" lang="plaintext"></span>
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<li id="acf377a6048463af1be7194687028ceca893b4d0">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/448cfdfb7c50463a092d35ea48c5b1a33eee3ba0#acf377a6048463af1be7194687028ceca893b4d0"><strong>testsuite/tests/dependent/should_fail/T16326_Fail6.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC2" class="line" lang="plaintext">T16326_Fail6.hs:9:3: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • GADT constructor type signature cannot contain nested ‘forall’s or contexts</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> Suggestion: instead use this type signature:</span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> MkFoo :: forall a. a -> Foo a</span>
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext"> • In the definition of data constructor ‘MkFoo’</span>
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<pre style="margin: 0;">-<span id="LC7" class="line" lang="plaintext"> In the data type declaration for ‘Foo’</span></pre>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T16326_Fail6.hs:9:12: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> Illegal visible, dependent quantification in the type of a term</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> (GHC does not yet support this)</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> In the definition of data constructor ‘MkFoo’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/448cfdfb7c50463a092d35ea48c5b1a33eee3ba0#6ef4f569c6fe7aa5345ba1eb75f039b06e91950b"><strong>testsuite/tests/gadt/T12087.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC2" class="line" lang="plaintext">T12087.hs:6:3: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • GADT constructor type signature cannot contain nested ‘forall’s or contexts</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> Suggestion: instead use this type signature:</span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> MkF1 :: forall a. (Ord a, Eq a) => a -> F1 a</span>
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext"> • In the definition of data constructor ‘MkF1’</span>
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<pre style="margin: 0;">-<span id="LC7" class="line" lang="plaintext"> In the data type declaration for ‘F1’</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T12087.hs:6:20: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> GADT constructor type signature cannot contain nested ‘forall’s or contexts</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> In the definition of data constructor ‘MkF1’</span>
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8
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC9" class="line" lang="plaintext">T12087.hs:9:3: error:</span>
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<pre style="margin: 0;">-<span id="LC10" class="line" lang="plaintext"> • GADT constructor type signature cannot contain nested ‘forall’s or contexts</span>
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<pre style="margin: 0;">-<span id="LC11" class="line" lang="plaintext"> Suggestion: instead use this type signature:</span>
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<pre style="margin: 0;">-<span id="LC12" class="line" lang="plaintext"> MkF2 :: forall a. (Ord a, Eq a) => a -> F2 a</span>
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<pre style="margin: 0;">-<span id="LC13" class="line" lang="plaintext"> • In the definition of data constructor ‘MkF2’</span>
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<pre style="margin: 0;">-<span id="LC14" class="line" lang="plaintext"> In the data type declaration for ‘F2’</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext">T12087.hs:9:25: error:</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> GADT constructor type signature cannot contain nested ‘forall’s or contexts</span>
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8
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext"> In the definition of data constructor ‘MkF2’</span>
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9
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC16" class="line" lang="plaintext">T12087.hs:12:3: error:</span>
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17
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<pre style="margin: 0;">-<span id="LC17" class="line" lang="plaintext"> • GADT constructor type signature cannot contain nested ‘forall’s or contexts</span>
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18
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<pre style="margin: 0;">-<span id="LC18" class="line" lang="plaintext"> Suggestion: instead use this type signature:</span>
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19
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<pre style="margin: 0;">-<span id="LC19" class="line" lang="plaintext"> MkF3 :: forall a b. (Eq a, Eq b) => a -> b -> F3 a</span>
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<pre style="margin: 0;">-<span id="LC20" class="line" lang="plaintext"> • In the definition of data constructor ‘MkF3’</span>
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<pre style="margin: 0;">-<span id="LC21" class="line" lang="plaintext"> In the data type declaration for ‘F3’</span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext">T12087.hs:12:34: error:</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext"> GADT constructor type signature cannot contain nested ‘forall’s or contexts</span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext"> In the definition of data constructor ‘MkF3’</span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC23" class="line" lang="plaintext">T12087.hs:15:3: error:</span>
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<pre style="margin: 0;">-<span id="LC24" class="line" lang="plaintext"> • GADT constructor type signature cannot contain nested ‘forall’s or contexts</span>
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25
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<pre style="margin: 0;">-<span id="LC25" class="line" lang="plaintext"> Suggestion: instead use this type signature:</span>
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<pre style="margin: 0;">-<span id="LC26" class="line" lang="plaintext"> MkF4 :: forall a b. (Eq a, Eq b) => a -> b -> F4 a</span>
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<pre style="margin: 0;">-<span id="LC27" class="line" lang="plaintext"> • In the definition of data constructor ‘MkF4’</span>
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<pre style="margin: 0;">-<span id="LC28" class="line" lang="plaintext"> In the data type declaration for ‘F4’</span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext">T12087.hs:15:36: error:</span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext"> GADT constructor type signature cannot contain nested ‘forall’s or contexts</span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="plaintext"> In the definition of data constructor ‘MkF4’</span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC30" class="line" lang="plaintext">T12087.hs:18:3: error:</span>
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<pre style="margin: 0;">-<span id="LC31" class="line" lang="plaintext"> • GADT constructor type signature cannot contain nested ‘forall’s or contexts</span>
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<pre style="margin: 0;">-<span id="LC32" class="line" lang="plaintext"> Suggestion: instead use this type signature:</span>
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<pre style="margin: 0;">-<span id="LC33" class="line" lang="plaintext"> MkF5 :: forall a b. Int -> Int -> a -> Int -> Int -> b -> F5 a</span>
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<pre style="margin: 0;">-<span id="LC34" class="line" lang="plaintext"> • In the definition of data constructor ‘MkF5’</span>
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<pre style="margin: 0;">-<span id="LC35" class="line" lang="plaintext"> In the data type declaration for ‘F5’</span></pre>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext">T12087.hs:18:25: error:</span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="plaintext"> GADT constructor type signature cannot contain nested ‘forall’s or contexts</span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="plaintext"> In the definition of data constructor ‘MkF5’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/448cfdfb7c50463a092d35ea48c5b1a33eee3ba0#8509bb9f0f6ac1ee468886ad737f9cec2fae114e"><strong>testsuite/tests/gadt/T14320.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">@@ -10,8 +10,8 @@ data Exp :: Type where</td>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">TypedExp</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TEGood</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="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Exp</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TypedExp</span> <span class="n" style="color: #333;">a</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC13" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The <span class="idiff left right">only difference here is that the type is wrapped in parentheses,</span></span></span>
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<pre style="margin: 0;">-<span id="LC14" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">but GHC 8.0.1 rejects this program</span></span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The <span class="idiff left right">presence of outer parentheses makes the `forall` nested, and</span></span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">GADTs do not permit nested `forall`s.</span></span></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">TypedExpToo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TEBad</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</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="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Exp</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TypedExpToo</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/448cfdfb7c50463a092d35ea48c5b1a33eee3ba0#93de4a073428e4fe5008cbc7548d0a02e940b599"><strong>testsuite/tests/gadt/T14320.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T14320.hs:17:14: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> GADT constructor type signature cannot contain nested ‘forall’s or contexts</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> In the definition of data constructor ‘TEBad’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/448cfdfb7c50463a092d35ea48c5b1a33eee3ba0#e1050500257a847cc4105b93168583a72a01cec5"><strong>testsuite/tests/gadt/T16427.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC2" class="line" lang="plaintext">T16427.hs:5:14: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • GADT constructor type signature cannot contain nested ‘forall’s or contexts</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> Suggestion: instead use this type signature:</span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> C :: forall b. Int -> b -> D</span>
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext"> • In the definition of data constructor ‘C’</span>
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<pre style="margin: 0;">-<span id="LC7" class="line" lang="plaintext"> In the data type declaration for ‘D’</span></pre>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T16427.hs:5:26: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> GADT constructor type signature cannot contain nested ‘forall’s or contexts</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> In the definition of data constructor ‘C’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/448cfdfb7c50463a092d35ea48c5b1a33eee3ba0#3f671452b7fb08de044a7961845d1cd0a3267367"><strong>testsuite/tests/gadt/T18191.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE GADTs #-}</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 RankNTypes #-}</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;">T18191</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;">T</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MkT</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</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="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">T</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">S</span> <span class="n" style="color: #333;">a</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MkS</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">S</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"></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="kt" style="color: #458; font-weight: 600;">U</span> <span class="n" style="color: #333;">a</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MkU</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Show</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;">U</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span></pre>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T18191.hs:6:11: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> GADT constructor type signature cannot contain nested ‘forall’s or contexts</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> In the definition of data constructor ‘MkT’</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext">T18191.hs:9:11: error:</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> GADT constructor type signature cannot contain nested ‘forall’s or contexts</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext"> In the definition of data constructor ‘MkS’</span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext">T18191.hs:12:11: error:</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext"> GADT constructor type signature cannot contain nested ‘forall’s or contexts</span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext"> In the definition of data constructor ‘MkU’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/448cfdfb7c50463a092d35ea48c5b1a33eee3ba0#c68bb340f8f227ab4ac9922422ce0177433e1dfc"><strong>testsuite/tests/gadt/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">@@ -113,10 +113,11 @@ test('T7558', normal, compile_fail, [''])</td>
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<pre style="margin: 0;"> <span id="LC113" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T9380</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC114" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T12087</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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115
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<pre style="margin: 0;"> <span id="LC115" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T12468</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="LC116" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T14320</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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116
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<pre style="margin: 0;">+<span id="LC116" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T14320</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 class="idiff left right">_fail</span></span><span class="p">,</span> <span class="p">[''])</span></span>
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117
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117
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<pre style="margin: 0;"> <span id="LC117" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T14719</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 class="s1" style="color: #d14;">-fdiagnostics-show-caret</span><span class="p">'])</span></span>
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118
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118
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<pre style="margin: 0;"> <span id="LC118" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T14808</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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119
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119
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<pre style="margin: 0;"> <span id="LC119" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T15009</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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120
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<pre style="margin: 0;"> <span id="LC120" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T15558</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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121
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121
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<pre style="margin: 0;"> <span id="LC121" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T16427</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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122
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122
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<pre style="margin: 0;"> <span id="LC122" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17423</span><span class="p">',</span> <span class="nv" style="color: #008080;">expect_broken</span><span class="p">(</span><span class="mi" style="color: #099;">17423</span><span class="p">),</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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123
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<pre style="margin: 0;">+<span id="LC123" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18191</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/448cfdfb7c50463a092d35ea48c5b1a33eee3ba0#4a46b9f4641629031a489def4b0fc1d83d099988"><strong>testsuite/tests/ghc-api/annotations/T10399.stdout</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -34,9 +34,9 @@</td>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="plaintext">((Test10399.hs:12:30,AnnComma), [Test10399.hs:12:30]),</span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="plaintext">((Test10399.hs:12:31-32,AnnCloseP), [Test10399.hs:12:32]),</span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="plaintext">((Test10399.hs:12:31-32,AnnOpenP), [Test10399.hs:12:31]),</span>
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<pre style="margin: 0;">-<span id="LC37" class="line" lang="plaintext">((Test10399.hs:(14,1)-(18,5<span class="idiff left right">5</span>),AnnData), [Test10399.hs:14:1-4]),</span>
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<pre style="margin: 0;">-<span id="LC38" class="line" lang="plaintext">((Test10399.hs:(14,1)-(18,5<span class="idiff left right">5</span>),AnnSemi), [Test10399.hs:20:1]),</span>
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<pre style="margin: 0;">-<span id="LC39" class="line" lang="plaintext">((Test10399.hs:(14,1)-(18,5<span class="idiff left right">5</span>),AnnWhere), [Test10399.hs:14:21-25]),</span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="plaintext">((Test10399.hs:(14,1)-(18,5<span class="idiff left right">3</span>),AnnData), [Test10399.hs:14:1-4]),</span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="plaintext">((Test10399.hs:(14,1)-(18,5<span class="idiff left right">3</span>),AnnSemi), [Test10399.hs:20:1]),</span>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="plaintext">((Test10399.hs:(14,1)-(18,5<span class="idiff left right">3</span>),AnnWhere), [Test10399.hs:14:21-25]),</span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="plaintext">((Test10399.hs:15:5-64,AnnDcolon), [Test10399.hs:15:11-12]),</span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="plaintext">((Test10399.hs:15:5-64,AnnSemi), [Test10399.hs:16:5]),</span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="plaintext">((Test10399.hs:15:14-64,AnnDot), [Test10399.hs:15:23]),</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">@@ -48,37 +48,29 @@</td>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="plaintext">((Test10399.hs:15:45-46,AnnBang), [Test10399.hs:15:45]),</span>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="plaintext">((Test10399.hs:15:45-46,AnnRarrow), [Test10399.hs:15:48-49]),</span>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="plaintext">((Test10399.hs:15:45-64,AnnRarrow), [Test10399.hs:15:48-49]),</span>
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<pre style="margin: 0;">-<span id="LC51" class="line" lang="plaintext">((Test10399.hs:(16,5)-(17,69),AnnCloseP), [Test10399.hs:17:69]),</span>
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<pre style="margin: 0;">-<span id="LC52" class="line" lang="plaintext">((Test10399.hs:(16,5)-(17,69),AnnDcolon), [Test10399.hs:16:12-13]),</span>
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<pre style="margin: 0;">-<span id="LC53" class="line" lang="plaintext">((Test10399.hs:(16,5)-(17,69),AnnOpenP), [Test10399.hs:16:27]),</span>
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<pre style="margin: 0;">-<span id="LC54" class="line" lang="plaintext">((Test10399.hs:(16,5)-(17,69),AnnSemi), [Test10399.hs:18:5]),</span>
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<pre style="margin: 0;">-<span id="LC55" class="line" lang="plaintext">((Test10399.hs:(16,15)-(17,69),AnnDot), [Test10399.hs:16:25]),</span>
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<pre style="margin: 0;">-<span id="LC56" class="line" lang="plaintext">((Test10399.hs:(16,15)-(17,69),AnnForall), [Test10399.hs:16:15-20]),</span>
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<pre style="margin: 0;">-<span id="LC57" class="line" lang="plaintext">((Test10399.hs:(16,27)-(17,69),AnnCloseP), [Test10399.hs:17:69]),</span>
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<pre style="margin: 0;">-<span id="LC58" class="line" lang="plaintext">((Test10399.hs:(16,27)-(17,69),AnnOpenP), [Test10399.hs:16:27]),</span>
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<pre style="margin: 0;">-<span id="LC59" class="line" lang="plaintext">((Test10399.hs:16:28-43,AnnCloseP), [Test10399.hs:16:43, Test10399.hs:16:43]),</span>
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<pre style="margin: 0;">-<span id="LC60" class="line" lang="plaintext">((Test10399.hs:16:28-43,AnnDarrow), [Test10399.hs:16:45-46]),</span>
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<pre style="margin: 0;">-<span id="LC61" class="line" lang="plaintext">((Test10399.hs:16:28-43,AnnOpenP), [Test10399.hs:16:28, Test10399.hs:16:28]),</span>
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<pre style="margin: 0;">-<span id="LC62" class="line" lang="plaintext">((Test10399.hs:16:30-33,AnnComma), [Test10399.hs:16:34]),</span>
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<pre style="margin: 0;">-<span id="LC63" class="line" lang="plaintext">((Test10399.hs:16:48,AnnRarrow), [Test10399.hs:16:50-51]),</span>
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<pre style="margin: 0;">-<span id="LC64" class="line" lang="plaintext">((Test10399.hs:(16,48)-(17,68),AnnRarrow), [Test10399.hs:16:50-51]),</span>
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<pre style="margin: 0;">-<span id="LC65" class="line" lang="plaintext">((Test10399.hs:16:53-66,AnnRarrow), [Test10399.hs:17:45-46]),</span>
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<pre style="margin: 0;">-<span id="LC66" class="line" lang="plaintext">((Test10399.hs:(16,53)-(17,68),AnnRarrow), [Test10399.hs:17:45-46]),</span>
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<pre style="margin: 0;">-<span id="LC67" class="line" lang="plaintext">((Test10399.hs:17:48,AnnRarrow), [Test10399.hs:17:50-51]),</span>
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<pre style="margin: 0;">-<span id="LC68" class="line" lang="plaintext">((Test10399.hs:17:48-68,AnnRarrow), [Test10399.hs:17:50-51]),</span>
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<pre style="margin: 0;">-<span id="LC69" class="line" lang="plaintext">((Test10399.hs:17:66-68,AnnCloseS), [Test10399.hs:17:68]),</span>
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<pre style="margin: 0;">-<span id="LC70" class="line" lang="plaintext">((Test10399.hs:17:66-68,AnnOpenS), [Test10399.hs:17:66]),</span>
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<pre style="margin: 0;">-<span id="LC71" class="line" lang="plaintext">((Test10399.hs:18:5-55,AnnCloseP), [Test10399.hs:18:55]),</span>
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<pre style="margin: 0;">-<span id="LC72" class="line" lang="plaintext">((Test10399.hs:18:5-55,AnnDcolon), [Test10399.hs:18:16-17]),</span>
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<pre style="margin: 0;">-<span id="LC73" class="line" lang="plaintext">((Test10399.hs:18:5-55,AnnOpenP), [Test10399.hs:18:19]),</span>
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<pre style="margin: 0;">-<span id="LC74" class="line" lang="plaintext">((Test10399.hs:18:19-55,AnnCloseP), [Test10399.hs:18:55]),</span>
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<pre style="margin: 0;">-<span id="LC75" class="line" lang="plaintext">((Test10399.hs:18:19-55,AnnOpenP), [Test10399.hs:18:19]),</span>
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<pre style="margin: 0;">-<span id="LC76" class="line" lang="plaintext">((Test10399.hs:18:20-54,AnnDot), [Test10399.hs:18:29]),</span>
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<pre style="margin: 0;">-<span id="LC77" class="line" lang="plaintext">((Test10399.hs:18:20-54,AnnForall), [Test10399.hs:18:20-25]),</span>
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<pre style="margin: 0;">-<span id="LC78" class="line" lang="plaintext">((Test10399.hs:18:31-36,AnnCloseP), [Test10399.hs:18:36]),</span>
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<pre style="margin: 0;">-<span id="LC79" class="line" lang="plaintext">((Test10399.hs:18:31-36,AnnOpenP), [Test10399.hs:18:31]),</span>
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<pre style="margin: 0;">-<span id="LC80" class="line" lang="plaintext">((Test10399.hs:18:31-36,AnnRarrow), [Test10399.hs:18:38-39]),</span>
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<pre style="margin: 0;">-<span id="LC81" class="line" lang="plaintext">((Test10399.hs:18:31-54,AnnRarrow), [Test10399.hs:18:38-39]),</span>
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51
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<pre style="margin: 0;">+<span id="LC51" class="line" lang="plaintext">((Test10399.hs:(16,5)-(17,67),AnnDcolon), [Test10399.hs:16:12-13]),</span>
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<pre style="margin: 0;">+<span id="LC52" class="line" lang="plaintext">((Test10399.hs:(16,5)-(17,67),AnnSemi), [Test10399.hs:18:5]),</span>
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53
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<pre style="margin: 0;">+<span id="LC53" class="line" lang="plaintext">((Test10399.hs:(16,15)-(17,67),AnnDot), [Test10399.hs:16:25]),</span>
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<pre style="margin: 0;">+<span id="LC54" class="line" lang="plaintext">((Test10399.hs:(16,15)-(17,67),AnnForall), [Test10399.hs:16:15-20]),</span>
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<pre style="margin: 0;">+<span id="LC55" class="line" lang="plaintext">((Test10399.hs:16:27-42,AnnCloseP), [Test10399.hs:16:42, Test10399.hs:16:42]),</span>
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56
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<pre style="margin: 0;">+<span id="LC56" class="line" lang="plaintext">((Test10399.hs:16:27-42,AnnDarrow), [Test10399.hs:16:44-45]),</span>
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57
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<pre style="margin: 0;">+<span id="LC57" class="line" lang="plaintext">((Test10399.hs:16:27-42,AnnOpenP), [Test10399.hs:16:27, Test10399.hs:16:27]),</span>
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58
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<pre style="margin: 0;">+<span id="LC58" class="line" lang="plaintext">((Test10399.hs:16:29-32,AnnComma), [Test10399.hs:16:33]),</span>
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<pre style="margin: 0;">+<span id="LC59" class="line" lang="plaintext">((Test10399.hs:16:47,AnnRarrow), [Test10399.hs:16:49-50]),</span>
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<pre style="margin: 0;">+<span id="LC60" class="line" lang="plaintext">((Test10399.hs:(16,47)-(17,67),AnnRarrow), [Test10399.hs:16:49-50]),</span>
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<pre style="margin: 0;">+<span id="LC61" class="line" lang="plaintext">((Test10399.hs:16:52-65,AnnRarrow), [Test10399.hs:17:44-45]),</span>
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<pre style="margin: 0;">+<span id="LC62" class="line" lang="plaintext">((Test10399.hs:(16,52)-(17,67),AnnRarrow), [Test10399.hs:17:44-45]),</span>
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63
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<pre style="margin: 0;">+<span id="LC63" class="line" lang="plaintext">((Test10399.hs:17:47,AnnRarrow), [Test10399.hs:17:49-50]),</span>
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64
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<pre style="margin: 0;">+<span id="LC64" class="line" lang="plaintext">((Test10399.hs:17:47-67,AnnRarrow), [Test10399.hs:17:49-50]),</span>
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65
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<pre style="margin: 0;">+<span id="LC65" class="line" lang="plaintext">((Test10399.hs:17:65-67,AnnCloseS), [Test10399.hs:17:67]),</span>
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66
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<pre style="margin: 0;">+<span id="LC66" class="line" lang="plaintext">((Test10399.hs:17:65-67,AnnOpenS), [Test10399.hs:17:65]),</span>
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67
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<pre style="margin: 0;">+<span id="LC67" class="line" lang="plaintext">((Test10399.hs:18:5-53,AnnDcolon), [Test10399.hs:18:16-17]),</span>
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68
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<pre style="margin: 0;">+<span id="LC68" class="line" lang="plaintext">((Test10399.hs:18:19-53,AnnDot), [Test10399.hs:18:28]),</span>
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69
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<pre style="margin: 0;">+<span id="LC69" class="line" lang="plaintext">((Test10399.hs:18:19-53,AnnForall), [Test10399.hs:18:19-24]),</span>
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70
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<pre style="margin: 0;">+<span id="LC70" class="line" lang="plaintext">((Test10399.hs:18:30-35,AnnCloseP), [Test10399.hs:18:35]),</span>
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<pre style="margin: 0;">+<span id="LC71" class="line" lang="plaintext">((Test10399.hs:18:30-35,AnnOpenP), [Test10399.hs:18:30]),</span>
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<pre style="margin: 0;">+<span id="LC72" class="line" lang="plaintext">((Test10399.hs:18:30-35,AnnRarrow), [Test10399.hs:18:37-38]),</span>
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<pre style="margin: 0;">+<span id="LC73" class="line" lang="plaintext">((Test10399.hs:18:30-53,AnnRarrow), [Test10399.hs:18:37-38]),</span>
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<pre style="margin: 0;"> <span id="LC74" class="line" lang="plaintext">((Test10399.hs:20:1-25,AnnCloseQ), [Test10399.hs:20:24-25]),</span>
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<pre style="margin: 0;"> <span id="LC75" class="line" lang="plaintext">((Test10399.hs:20:1-25,AnnOpen), [Test10399.hs:20:1-3]),</span>
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<pre style="margin: 0;"> <span id="LC76" class="line" lang="plaintext">((Test10399.hs:20:1-25,AnnSemi), [Test10399.hs:22:1]),</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/448cfdfb7c50463a092d35ea48c5b1a33eee3ba0#dda3d34c53662ecea8d6db93a554833039ce70a6"><strong>testsuite/tests/ghc-api/annotations/Test10399.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">@@ -13,9 +13,9 @@ mkPoli = mkBila . map ((,,(),,()) <$> P.base <*> P.pos <*> P.form)</td>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeDefault</span> <span class="n" style="color: #333;">v</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SetTo</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">v</span> <span class="o" style="font-weight: 600;">.</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span> <span class="n" style="color: #333;">v</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Show</span> <span class="n" style="color: #333;">v</span> <span class="p">)</span> <span class="o" style="font-weight: 600;">=></span> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">v</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeDefault</span> <span class="n" style="color: #333;">v</span></span>
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<pre style="margin: 0;">-<span id="LC16" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SetTo4</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">v</span> <span class="n" style="color: #333;">a</span><span class="o" style="font-weight: 600;">.</span> <span class="p">(<span class="idiff left right">(</span></span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span> <span class="n" style="color: #333;">v</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Show</span> <span class="n" style="color: #333;">v</span> <span class="p">)</span> <span class="o" style="font-weight: 600;">=></span> <span class="n" style="color: #333;">v</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeDefault</span> <span class="n" style="color: #333;">v</span></span>
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<pre style="margin: 0;">-<span id="LC17" class="line" lang="haskell"> <span class="idiff left"> </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">a</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">MaybeDefault</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="n" style="color: #333;"><span class="idiff">a</span></span><span class="p"><span class="idiff right">])</span></span></span>
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<pre style="margin: 0;">-<span id="LC18" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TestParens</span> <span class="o" style="font-weight: 600;">::</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">forall</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">v</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">.</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Eq</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">v</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="kt" style="color: #458; font-weight: 600;"><span class="idiff">MaybeDefault</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">v</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SetTo4</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">v</span> <span class="n" style="color: #333;">a</span><span class="o" style="font-weight: 600;">.</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span> <span class="n" style="color: #333;">v</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Show</span> <span class="n" style="color: #333;">v</span> <span class="p">)</span> <span class="o" style="font-weight: 600;">=></span> <span class="n" style="color: #333;">v</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeDefault</span> <span class="n" style="color: #333;">v</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><span class="idiff left">-></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">a</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">MaybeDefault</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="n" style="color: #333;"><span class="idiff">a</span></span><span class="p"><span class="idiff right">]</span></span></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TestParens</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;"><span class="idiff left">forall</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">v</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">.</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Eq</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">v</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="kt" style="color: #458; font-weight: 600;"><span class="idiff">MaybeDefault</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">v</span></span></span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"><span class="o" style="font-weight: 600;">[</span><span class="n" style="color: #333;">t</span><span class="o" style="font-weight: 600;">|</span> Map.Map T.Text $tc <span class="o" style="font-weight: 600;">|]</span></span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/448cfdfb7c50463a092d35ea48c5b1a33eee3ba0#f280a86ff33795996823f122b6eb9e188375d60d"><strong>testsuite/tests/parser/should_compile/T15323.hs</strong></a>
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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;">T15323</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;">MaybeDefault</span> <span class="n" style="color: #333;">v</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TestParens</span> <span class="o" style="font-weight: 600;">::</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">forall</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">v</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">.</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Eq</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">v</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="kt" style="color: #458; font-weight: 600;"><span class="idiff">MaybeDefault</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">v</span></span><span class="p"><span class="idiff right">)</span></span></span></pre>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TestParens</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;"><span class="idiff left">forall</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">v</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">.</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Eq</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">v</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="kt" style="color: #458; font-weight: 600;"><span class="idiff">MaybeDefault</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">v</span></span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/448cfdfb7c50463a092d35ea48c5b1a33eee3ba0#80cef6ecfd8cfb192e74919082dee97bf5a70067"><strong>testsuite/tests/parser/should_compile/T15323.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="plaintext"> {ModuleName: T15323}))</span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="plaintext"> (Nothing)</span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext"> []</span>
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<pre style="margin: 0;">-<span id="LC11" class="line" lang="plaintext"> [({ T15323.hs:(5,1)-(6,5<span class="idiff left right">6</span>) }</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext"> [({ T15323.hs:(5,1)-(6,5<span class="idiff left right">4</span>) }</span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="plaintext"> (TyClD</span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="plaintext"> (NoExtField)</span>
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14
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14
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="plaintext"> (DataDecl</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">@@ -33,60 +33,60 @@</td>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="plaintext"> [])</span>
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34
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="plaintext"> (Nothing)</span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="plaintext"> (Nothing)</span>
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<pre style="margin: 0;">-<span id="LC36" class="line" lang="plaintext"> [({ T15323.hs:6:5-5<span class="idiff left right">6</span> }</span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="plaintext"> [({ T15323.hs:6:5-5<span class="idiff left right">4</span> }</span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="plaintext"> (ConDeclGADT</span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="plaintext"> (NoExtField)</span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="plaintext"> [({ T15323.hs:6:5-14 }</span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="plaintext"> (Unqual</span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="plaintext"> {OccName: TestParens}))]</span>
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<pre style="margin: 0;">-<span id="LC42" class="line" lang="plaintext"> ({ T15323.hs:6:2<span class="idiff left right">1-55</span> }</span>
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<pre style="margin: 0;">+<span id="LC42" class="line" lang="plaintext"> ({ T15323.hs:6:2<span class="idiff left right">0-54</span> }</span>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="plaintext"> (True))</span>
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<pre style="margin: 0;">-<span id="LC44" class="line" lang="plaintext"> [({ T15323.hs:6:2<span class="idiff left right">8</span> }</span>
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<pre style="margin: 0;">+<span id="LC44" class="line" lang="plaintext"> [({ T15323.hs:6:2<span class="idiff left right">7</span> }</span>
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45
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="plaintext"> (UserTyVar</span>
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46
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="plaintext"> (NoExtField)</span>
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47
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="plaintext"> (SpecifiedSpec)</span>
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<pre style="margin: 0;">-<span id="LC48" class="line" lang="plaintext"> ({ T15323.hs:6:2<span class="idiff left right">8</span> }</span>
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="plaintext"> ({ T15323.hs:6:2<span class="idiff left right">7</span> }</span>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="plaintext"> (Unqual</span>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="plaintext"> {OccName: v}))))]</span>
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51
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="plaintext"> (Just</span>
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<pre style="margin: 0;">-<span id="LC52" class="line" lang="plaintext"> ({ T15323.hs:6:3<span class="idiff left right">2-37</span> }</span>
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<pre style="margin: 0;">-<span id="LC53" class="line" lang="plaintext"> [({ T15323.hs:6:3<span class="idiff left right">2-37</span> }</span>
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<pre style="margin: 0;">+<span id="LC52" class="line" lang="plaintext"> ({ T15323.hs:6:3<span class="idiff left right">1-36</span> }</span>
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<pre style="margin: 0;">+<span id="LC53" class="line" lang="plaintext"> [({ T15323.hs:6:3<span class="idiff left right">1-36</span> }</span>
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="plaintext"> (HsParTy</span>
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55
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="plaintext"> (NoExtField)</span>
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56
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<pre style="margin: 0;">-<span id="LC56" class="line" lang="plaintext"> ({ T15323.hs:6:3<span class="idiff left right">3-36</span> }</span>
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<pre style="margin: 0;">+<span id="LC56" class="line" lang="plaintext"> ({ T15323.hs:6:3<span class="idiff left right">2-35</span> }</span>
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57
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<pre style="margin: 0;"> <span id="LC57" class="line" lang="plaintext"> (HsAppTy</span>
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58
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58
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<pre style="margin: 0;"> <span id="LC58" class="line" lang="plaintext"> (NoExtField)</span>
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59
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<pre style="margin: 0;">-<span id="LC59" class="line" lang="plaintext"> ({ T15323.hs:6:3<span class="idiff left right">3-34</span> }</span>
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59
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<pre style="margin: 0;">+<span id="LC59" class="line" lang="plaintext"> ({ T15323.hs:6:3<span class="idiff left right">2-33</span> }</span>
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60
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60
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="plaintext"> (HsTyVar</span>
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61
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61
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<pre style="margin: 0;"> <span id="LC61" class="line" lang="plaintext"> (NoExtField)</span>
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62
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62
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<pre style="margin: 0;"> <span id="LC62" class="line" lang="plaintext"> (NotPromoted)</span>
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63
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<pre style="margin: 0;">-<span id="LC63" class="line" lang="plaintext"> ({ T15323.hs:6:3<span class="idiff left right">3-34</span> }</span>
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63
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<pre style="margin: 0;">+<span id="LC63" class="line" lang="plaintext"> ({ T15323.hs:6:3<span class="idiff left right">2-33</span> }</span>
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64
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64
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<pre style="margin: 0;"> <span id="LC64" class="line" lang="plaintext"> (Unqual</span>
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65
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65
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<pre style="margin: 0;"> <span id="LC65" class="line" lang="plaintext"> {OccName: Eq}))))</span>
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66
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<pre style="margin: 0;">-<span id="LC66" class="line" lang="plaintext"> ({ T15323.hs:6:3<span class="idiff left right">6</span> }</span>
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66
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<pre style="margin: 0;">+<span id="LC66" class="line" lang="plaintext"> ({ T15323.hs:6:3<span class="idiff left right">5</span> }</span>
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67
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67
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<pre style="margin: 0;"> <span id="LC67" class="line" lang="plaintext"> (HsTyVar</span>
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68
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68
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<pre style="margin: 0;"> <span id="LC68" class="line" lang="plaintext"> (NoExtField)</span>
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69
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69
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<pre style="margin: 0;"> <span id="LC69" class="line" lang="plaintext"> (NotPromoted)</span>
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70
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<pre style="margin: 0;">-<span id="LC70" class="line" lang="plaintext"> ({ T15323.hs:6:3<span class="idiff left right">6</span> }</span>
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70
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<pre style="margin: 0;">+<span id="LC70" class="line" lang="plaintext"> ({ T15323.hs:6:3<span class="idiff left right">5</span> }</span>
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71
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71
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="plaintext"> (Unqual</span>
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72
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72
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<pre style="margin: 0;"> <span id="LC72" class="line" lang="plaintext"> {OccName: v}))))))))]))</span>
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73
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73
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<pre style="margin: 0;"> <span id="LC73" class="line" lang="plaintext"> (PrefixCon</span>
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74
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74
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<pre style="margin: 0;"> <span id="LC74" class="line" lang="plaintext"> [])</span>
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75
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<pre style="margin: 0;">-<span id="LC75" class="line" lang="plaintext"> ({ T15323.hs:6:4<span class="idiff left right">2-55</span> }</span>
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75
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<pre style="margin: 0;">+<span id="LC75" class="line" lang="plaintext"> ({ T15323.hs:6:4<span class="idiff left right">1-54</span> }</span>
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76
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76
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<pre style="margin: 0;"> <span id="LC76" class="line" lang="plaintext"> (HsAppTy</span>
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77
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77
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<pre style="margin: 0;"> <span id="LC77" class="line" lang="plaintext"> (NoExtField)</span>
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78
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<pre style="margin: 0;">-<span id="LC78" class="line" lang="plaintext"> ({ T15323.hs:6:4<span class="idiff left right">2-53</span> }</span>
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78
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<pre style="margin: 0;">+<span id="LC78" class="line" lang="plaintext"> ({ T15323.hs:6:4<span class="idiff left right">1-52</span> }</span>
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79
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<pre style="margin: 0;"> <span id="LC79" class="line" lang="plaintext"> (HsTyVar</span>
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80
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80
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<pre style="margin: 0;"> <span id="LC80" class="line" lang="plaintext"> (NoExtField)</span>
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81
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81
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<pre style="margin: 0;"> <span id="LC81" class="line" lang="plaintext"> (NotPromoted)</span>
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82
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<pre style="margin: 0;">-<span id="LC82" class="line" lang="plaintext"> ({ T15323.hs:6:4<span class="idiff left right">2-53</span> }</span>
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82
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<pre style="margin: 0;">+<span id="LC82" class="line" lang="plaintext"> ({ T15323.hs:6:4<span class="idiff left right">1-52</span> }</span>
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83
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83
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<pre style="margin: 0;"> <span id="LC83" class="line" lang="plaintext"> (Unqual</span>
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84
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84
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<pre style="margin: 0;"> <span id="LC84" class="line" lang="plaintext"> {OccName: MaybeDefault}))))</span>
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85
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<pre style="margin: 0;">-<span id="LC85" class="line" lang="plaintext"> ({ T15323.hs:6:5<span class="idiff left right">5</span> }</span>
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<pre style="margin: 0;">+<span id="LC85" class="line" lang="plaintext"> ({ T15323.hs:6:5<span class="idiff left right">4</span> }</span>
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86
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86
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<pre style="margin: 0;"> <span id="LC86" class="line" lang="plaintext"> (HsTyVar</span>
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87
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87
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<pre style="margin: 0;"> <span id="LC87" class="line" lang="plaintext"> (NoExtField)</span>
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88
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88
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<pre style="margin: 0;"> <span id="LC88" class="line" lang="plaintext"> (NotPromoted)</span>
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89
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<pre style="margin: 0;">-<span id="LC89" class="line" lang="plaintext"> ({ T15323.hs:6:5<span class="idiff left right">5</span> }</span>
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89
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<pre style="margin: 0;">+<span id="LC89" class="line" lang="plaintext"> ({ T15323.hs:6:5<span class="idiff left right">4</span> }</span>
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90
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90
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<pre style="margin: 0;"> <span id="LC90" class="line" lang="plaintext"> (Unqual</span>
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91
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91
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<pre style="margin: 0;"> <span id="LC91" class="line" lang="plaintext"> {OccName: v}))))))</span>
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92
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92
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<pre style="margin: 0;"> <span id="LC92" class="line" lang="plaintext"> (Nothing)))]</span>
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