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<h3>
Simon Peyton Jones pushed to branch wip/T18891
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
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<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6f6cd8b076e4703436a3b31e4eac4a87c7cb8e7f">6f6cd8b0</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-11-25T12:49:58+00:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix kind inference for data types. Again.
This patch improves kcConDecls, when we are inferring the kind
of a data type decl.
Specifically
* In kcConDecls/kcConDecl make it clear that the tc_res_kind argument
is only used in the H98 case; and in that case there is not result
kind signature; and hence no need for the disgusting splitPiTys in
kcConDecls (now thankfully gone).
The GADT case is a bit different to before, and much nicer.
This is what fixes #18891.
See Note [kcConDecls: kind-checking data type decls]
* Do not look at the constructor decls of a data/newtype instance
in tcDataFamInstanceHeader. See new
Note [Kind inference for data family instances]
This causes a few knock-on effects in the tests suite, because
we require more information than before in the instance /header/.
New user-manual material about this in "Kind inference in data type
declarations" and "Kind inference for data/newtype instance
declarations".
* Minor improvement in kcTyClDecl, combining GADT and H98 case.
Fixes #18891
</pre>
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<h4>21 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#9355bef855426caf5f526925edf351b20f9a86c4">
compiler/GHC/Tc/Gen/HsType.hs
</a>
</li>
<li class="file-stats">
<a href="#83d23a46bb6cdc8b1edc16f1fd2c8f5c53e2c9ca">
compiler/GHC/Tc/TyCl.hs
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<li class="file-stats">
<a href="#e63425e031ffe9350ee6b1687e506aaea75d11e1">
compiler/GHC/Tc/TyCl/Instance.hs
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<li class="file-stats">
<a href="#fa050e1532c92b2ffc94692d8b368f3fefa3196d">
docs/users_guide/exts/poly_kinds.rst
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<li class="file-stats">
<a href="#05e2feaa7ccbd427e12a90d25808ead5ec587c63">
testsuite/tests/dependent/should_fail/T13780a.stderr
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<li class="file-stats">
<a href="#526bbf30531cad446c3194aa829668c9c4650b0a">
testsuite/tests/deriving/should_compile/T11416.hs
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<li class="file-stats">
<a href="#5b83e99d7c85673bbd8af817bf225cf3695013b9">
testsuite/tests/deriving/should_compile/T9359.hs
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<li class="file-stats">
<a href="#bc4ffdf271cd138b7e3e72937084080b70f4e95b">
testsuite/tests/patsyn/should_fail/T15685.stderr
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<li class="file-stats">
<a href="#9cf9e43ad6ba49c6f9ba05365e796e4358376763">
testsuite/tests/polykinds/T13659.stderr
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<li class="file-stats">
<a href="#4af4eaeded9c126e6a4ee186db90f5b886b80799">
testsuite/tests/polykinds/T16221a.stderr
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<li class="file-stats">
<a href="#963e82a98233f65b20b6eed015bb2bd423433593">
testsuite/tests/th/T9692.hs
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<li class="file-stats">
<a href="#dac489fd9971f93cf5f4c1655e3ab898e190a541">
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testsuite/tests/typecheck/should_compile/T18891.hs
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<a href="#460a0a2288242ede875741a395ec8673b7a822d0">
testsuite/tests/typecheck/should_compile/UnliftedNewtypesUnassociatedFamily.hs
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<li class="file-stats">
<a href="#8a9c9b7ef8854c111f962e63af9191c2300a6382">
testsuite/tests/typecheck/should_compile/UnliftedNewtypesUnifySig.hs
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<li class="file-stats">
<a href="#34fe7bf0e6fbf60effb28393399ba68666593909">
testsuite/tests/typecheck/should_compile/all.T
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<li class="file-stats">
<a href="#4968e845853db814d0441fbf636d7b942d6beca2">
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testsuite/tests/typecheck/should_fail/T18891a.hs
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testsuite/tests/typecheck/should_fail/T18891a.stderr
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<li class="file-stats">
<a href="#9d34b8cddaf28088631549895343f495bc16ad14">
testsuite/tests/typecheck/should_fail/UnliftedNewtypesFamilyKindFail2.stderr
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<a href="#b66ac8a3829a9ca3a4bbfecd10731b973b1e5f1a">
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testsuite/tests/typecheck/should_fail/UnliftedNewtypesUnassociatedFamilyFail.hs
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testsuite/tests/typecheck/should_fail/UnliftedNewtypesUnassociatedFamilyFail.stderr
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<li class="file-stats">
<a href="#b9e86d897a62509b0114d81d5e736630d6f68f43">
testsuite/tests/typecheck/should_fail/all.T
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<h4>Changes:</h4>
<li id="9355bef855426caf5f526925edf351b20f9a86c4">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6f6cd8b076e4703436a3b31e4eac4a87c7cb8e7f#9355bef855426caf5f526925edf351b20f9a86c4"><strong>compiler/GHC/Tc/Gen/HsType.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2981,7 +2981,7 @@ bindOuterSigTKBndrs_Tv_M :: TcTyMode</td>
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<pre style="margin: 0;"> <span id="LC2981" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</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;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsOuterSigTyVarBndrs</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">,</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2982" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Do not push level; do not make implication constraint; use Tvs</span></span>
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<pre style="margin: 0;"> <span id="LC2983" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Two major clients of this "bind-only" path are:</span></span>
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<pre style="margin: 0;">-<span id="LC2984" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note [<span class="idiff left right">Kind-checking for</span> GADTs] in TyCl</span></span>
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<pre style="margin: 0;">+<span id="LC2984" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note [<span class="idiff left right">Using TyVarTvs for kind-checking</span> GADTs] in TyCl</span></span>
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<pre style="margin: 0;"> <span id="LC2985" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note [Checking partial type signatures]</span></span>
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<pre style="margin: 0;"> <span id="LC2986" class="line" lang="haskell"><span class="n" style="color: #333;">bindOuterSigTKBndrs_Tv_M</span> <span class="n" style="color: #333;">mode</span></span>
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<pre style="margin: 0;"> <span id="LC2987" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bindOuterTKBndrsX</span> <span class="p">(</span><span class="n" style="color: #333;">smVanilla</span> <span class="p">{</span> <span class="n" style="color: #333;">sm_clone</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">,</span> <span class="n" style="color: #333;">sm_tvtv</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="3294" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="3294" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -3294,8 +3294,8 @@ When we /must/ clone.</td>
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<pre style="margin: 0;"> <span id="LC3294" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> When kind-checking T, we give (a :: kappa1). Then:</span></span>
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<pre style="margin: 0;"> <span id="LC3295" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3296" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - In kcConDecl we make a TyVarTv unification variable kappa2 for k2</span></span>
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<pre style="margin: 0;">-<span id="LC3297" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (as described in Note [<span class="idiff left right">Kind-checking for GADTs], even though this</span></span></span>
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<pre style="margin: 0;">-<span id="LC3298" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> example is an existential)</span></span>
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<pre style="margin: 0;">+<span id="LC3297" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (as described in Note [<span class="idiff left right">Using TyVarTvs for kind-checking GADTs],</span></span></span>
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<pre style="margin: 0;">+<span id="LC3298" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> e<span class="idiff left right">ven though this e</span>xample is an existential)</span></span>
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<pre style="margin: 0;"> <span id="LC3299" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - So we get (b :: kappa2) via bindExplicitTKBndrs_Tv</span></span>
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<pre style="margin: 0;"> <span id="LC3300" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - We end up unifying kappa1 := kappa2, because of the (SameKind a b)</span></span>
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<pre style="margin: 0;"> <span id="LC3301" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6f6cd8b076e4703436a3b31e4eac4a87c7cb8e7f#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">@@ -1529,27 +1529,16 @@ kcTyClDecl :: TyClDecl GhcRn -> TcTyCon -> TcM ()</td>
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<pre style="margin: 0;"> <span id="LC1529" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- result kind signature have already been dealt with</span></span>
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<pre style="margin: 0;"> <span id="LC1530" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- by inferInitialKind, so we can ignore them here.</span></span>
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1531
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<pre style="margin: 0;"> <span id="LC1531" class="line" lang="haskell"></span>
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1532
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<pre style="margin: 0;">-<span id="LC1532" class="line" lang="haskell"><span class="n" style="color: #333;">kcTyClDecl</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DataDecl</span> <span class="p">{</span> <span class="n" style="color: #333;">tcdLName</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="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">name</span><span class="p">)</span></span>
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1533
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<pre style="margin: 0;">-<span id="LC1533" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcdDataDefn</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">defn</span> <span class="p">})</span> <span class="n" style="color: #333;">tyCon</span></span>
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1534
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<pre style="margin: 0;">-<span id="LC1534" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">HsDataDefn</span> <span class="p">{</span> <span class="n" style="color: #333;">dd_cons</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cons</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="kr" 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="o" style="font-weight: 600;">:</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span></span>
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1535
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<pre style="margin: 0;">-<span id="LC1535" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">dd_ctxt</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="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span></span>
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1536
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<pre style="margin: 0;">-<span id="LC1536" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">dd_ND</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">new_or_data</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">defn</span></span>
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1537
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<pre style="margin: 0;">-<span id="LC1537" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Implementation of UnliftedNewtypes] STEP 2</span></span>
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1538
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<pre style="margin: 0;">-<span id="LC1538" class="line" lang="haskell"> <span class="n" style="color: #333;">kcConDecls</span> <span class="n" style="color: #333;">new_or_data</span> <span class="p">(</span><span class="n" style="color: #333;">tyConResKind</span> <span class="n" style="color: #333;">tyCon</span><span class="p">)</span> <span class="n" style="color: #333;">cons</span></span>
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1539
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<pre style="margin: 0;">-<span id="LC1539" class="line" lang="haskell"></span>
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1540
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<pre style="margin: 0;">-<span id="LC1540" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- hs_tvs and dd_kindSig already dealt with in inferInitialKind</span></span>
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1541
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<pre style="margin: 0;">-<span id="LC1541" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This must be a GADT-style decl,</span></span>
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1542
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<pre style="margin: 0;">-<span id="LC1542" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (see invariants of DataDefn declaration)</span></span>
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<pre style="margin: 0;">-<span id="LC1543" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- so (a) we don't need to bring the hs_tvs into scope, because the</span></span>
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<pre style="margin: 0;">-<span id="LC1544" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ConDecls bind all their own variables</span></span>
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<pre style="margin: 0;">-<span id="LC1545" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (b) dd_ctxt is not allowed for GADT-style decls, so we can ignore it</span></span>
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<pre style="margin: 0;">-<span id="LC1546" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1547" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">HsDataDefn</span> <span class="p">{</span> <span class="n" style="color: #333;">dd_ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctxt</span></span>
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1548
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<pre style="margin: 0;">-<span id="LC1548" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">dd_cons</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cons</span></span>
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1549
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<pre style="margin: 0;">-<span id="LC1549" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">dd_ND</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">new_or_data</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">defn</span></span>
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<pre style="margin: 0;">+<span id="LC1532" class="line" lang="haskell"><span class="n" style="color: #333;">kcTyClDecl</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DataDecl</span> <span class="p">{</span> <span class="n" style="color: #333;">tcdLName</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="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">name</span><span class="p">),</span> <span class="n" style="color: #333;">tcdDataDefn</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">defn</span> <span class="p">})</span> <span class="n" style="color: #333;">tycon</span></span>
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<pre style="margin: 0;">+<span id="LC1533" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">HsDataDefn</span> <span class="p">{</span> <span class="n" style="color: #333;">dd_ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctxt</span><span class="p">,</span> <span class="n" style="color: #333;">dd_cons</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cons</span><span class="p">,</span> <span class="n" style="color: #333;">dd_ND</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">new_or_data</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">defn</span></span>
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<pre style="margin: 0;"> <span id="LC1534" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bindTyClTyVars</span> <span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">-<span id="LC1551" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcHsContext</span> <span class="n" style="color: #333;">ctxt</span></span>
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1552
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<pre style="margin: 0;">-<span id="LC1552" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">kcConDecls</span> <span class="n" style="color: #333;">new_or_data</span> <span class="p">(</span><span class="n" style="color: #333;">tyConResKind</span> <span class="n" style="color: #333;">tyCon</span><span class="p">)</span> <span class="n" style="color: #333;">cons</span></span>
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<pre style="margin: 0;">+<span id="LC1535" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: binding these tyvars isn't necessary for GADTs, but it does no</span></span>
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<pre style="margin: 0;">+<span id="LC1536" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- harm. For GADTs, each data con brings its own tyvars into scope,</span></span>
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<pre style="margin: 0;">+<span id="LC1537" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- and the ones from this bindTyClTyVars are either not mentioned or</span></span>
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1538
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<pre style="margin: 0;">+<span id="LC1538" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (conceivably) shadowed.</span></span>
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1539
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<pre style="margin: 0;">+<span id="LC1539" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"kcTyClDecl"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tycon</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">tyConTyVars</span> <span class="n" style="color: #333;">tycon</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">tyConResKind</span> <span class="n" style="color: #333;">tycon</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC1540" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcHsContext</span> <span class="n" style="color: #333;">ctxt</span></span>
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<pre style="margin: 0;">+<span id="LC1541" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">kcConDecls</span> <span class="n" style="color: #333;">new_or_data</span> <span class="p">(</span><span class="n" style="color: #333;">tyConResKind</span> <span class="n" style="color: #333;">tycon</span><span class="p">)</span> <span class="n" style="color: #333;">cons</span></span>
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<pre style="margin: 0;"> <span id="LC1542" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1543" class="line" lang="haskell"></span>
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1544
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<pre style="margin: 0;"> <span id="LC1544" class="line" lang="haskell"><span class="n" style="color: #333;">kcTyClDecl</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SynDecl</span> <span class="p">{</span> <span class="n" style="color: #333;">tcdLName</span> <span class="o" style="font-weight: 600;">=</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;">name</span><span class="p">,</span> <span class="n" style="color: #333;">tcdRhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs</span> <span class="p">})</span> <span class="n" style="color: #333;">_tycon</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">@@ -1606,13 +1595,12 @@ kcConGADTArgs new_or_data res_kind con_args = case con_args of</td>
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<pre style="margin: 0;"> <span id="LC1595" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1596" class="line" lang="haskell"><span class="n" style="color: #333;">kcConDecls</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">NewOrData</span></span>
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<pre style="margin: 0;"> <span id="LC1597" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Kind</span> <span class="c1" style="color: #998; font-style: italic;">-- The result kind signature</span></span>
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1598
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<pre style="margin: 0;">+<span id="LC1598" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Used only in H98 case</span></span>
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1599
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<pre style="margin: 0;"> <span id="LC1599" 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;">LConDecl</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- The data constructors</span></span>
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1610
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1600
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<pre style="margin: 0;"> <span id="LC1600" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">-<span id="LC1611" class="line" lang="haskell"><span class="n" style="color: #333;">kcConDecls</span> <span class="n" style="color: #333;">new_or_data</span> <span class="n" style="color: #333;">res_kind</span> <span class="n" style="color: #333;">cons</span></span>
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1612
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<pre style="margin: 0;">-<span id="LC1612" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapM_</span> <span class="p">(</span><span class="n" style="color: #333;">wrapLocM_</span> <span class="p">(</span><span class="n" style="color: #333;">kcConDecl</span> <span class="n" style="color: #333;">new_or_data</span> <span class="n" style="color: #333;">final_res_kind</span><span class="p">))</span> <span class="n" style="color: #333;">cons</span></span>
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1613
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<pre style="margin: 0;">-<span id="LC1613" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC1614" class="line" lang="haskell"> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">final_res_kind</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitPiTys</span> <span class="n" style="color: #333;">res_kind</span></span>
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<pre style="margin: 0;">-<span id="LC1615" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [kcConDecls result kind]</span></span>
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<pre style="margin: 0;">+<span id="LC1601" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [kcConDecls: kind-checking data type decls]</span></span>
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<pre style="margin: 0;">+<span id="LC1602" class="line" lang="haskell"><span class="n" style="color: #333;">kcConDecls</span> <span class="n" style="color: #333;">new_or_data</span> <span class="n" style="color: #333;">tc_res_kind</span> <span class="n" style="color: #333;">cons</span></span>
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<pre style="margin: 0;">+<span id="LC1603" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapM_</span> <span class="p">(</span><span class="n" style="color: #333;">wrapLocM_</span> <span class="p">(</span><span class="n" style="color: #333;">kcConDecl</span> <span class="n" style="color: #333;">new_or_data</span> <span class="n" style="color: #333;">tc_res_kind</span><span class="p">))</span> <span class="n" style="color: #333;">cons</span></span>
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1616
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<pre style="margin: 0;"> <span id="LC1604" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1605" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Kind check a data constructor. In additional to the data constructor,</span></span>
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<pre style="margin: 0;"> <span id="LC1606" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- we also need to know about whether or not its corresponding type was</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">@@ -1623,82 +1611,69 @@ kcConDecl :: NewOrData</td>
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<pre style="margin: 0;"> <span id="LC1611" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Kind</span> <span class="c1" style="color: #998; font-style: italic;">-- Result kind of the type constructor</span></span>
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<pre style="margin: 0;"> <span id="LC1612" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Usually Type but can be TYPE UnliftedRep</span></span>
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<pre style="margin: 0;"> <span id="LC1613" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- or even TYPE r, in the case of unlifted newtype</span></span>
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<pre style="margin: 0;">+<span id="LC1614" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Used only in H98 case</span></span>
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1626
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1615
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<pre style="margin: 0;"> <span id="LC1615" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ConDecl</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span></span>
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1627
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1616
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<pre style="margin: 0;"> <span id="LC1616" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1628
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<pre style="margin: 0;">-<span id="LC1628" class="line" lang="haskell"><span class="n" style="color: #333;">kcConDecl</span> <span class="n" style="color: #333;">new_or_data</span> <span class="n" style="color: #333;">res_kind</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ConDeclH98</span></span>
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1617
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<pre style="margin: 0;">+<span id="LC1617" class="line" lang="haskell"><span class="n" style="color: #333;">kcConDecl</span> <span class="n" style="color: #333;">new_or_data</span> <span class="n" style="color: #333;"><span class="idiff left right">tc_</span>res_kind</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ConDeclH98</span></span>
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1629
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1618
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<pre style="margin: 0;"> <span id="LC1618" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">con_name</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">name</span><span class="p">,</span> <span class="n" style="color: #333;">con_ex_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ex_tvs</span></span>
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1630
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1619
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<pre style="margin: 0;"> <span id="LC1619" 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;">ex_ctxt</span><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>
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1631
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<td class="diff-line-num new_line" data-linenumber="1620" 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">
1620
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<pre style="margin: 0;"> <span id="LC1620" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addErrCtxt</span> <span class="p">(</span><span class="n" style="color: #333;">dataConCtxtName</span> <span class="p">[</span><span class="n" style="color: #333;">name</span><span class="p">])</span> <span class="o" style="font-weight: 600;">$</span></span>
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1632
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1621
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<pre style="margin: 0;"> <span id="LC1621" class="line" lang="haskell"> <span class="n" style="color: #333;">discardResult</span> <span class="o" style="font-weight: 600;">$</span></span>
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1633
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1622
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<pre style="margin: 0;"> <span id="LC1622" class="line" lang="haskell"> <span class="n" style="color: #333;">bindExplicitTKBndrs_Tv</span> <span class="n" style="color: #333;">ex_tvs</span> <span class="o" style="font-weight: 600;">$</span></span>
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1634
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1623
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<pre style="margin: 0;"> <span id="LC1623" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcHsMbContext</span> <span class="n" style="color: #333;">ex_ctxt</span></span>
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1635
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<pre style="margin: 0;">-<span id="LC1635" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">kcConH98Args</span> <span class="n" style="color: #333;">new_or_data</span> <span class="n" style="color: #333;">res_kind</span> <span class="n" style="color: #333;">args</span></span>
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1624
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<pre style="margin: 0;">+<span id="LC1624" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">kcConH98Args</span> <span class="n" style="color: #333;">new_or_data</span> <span class="n" style="color: #333;"><span class="idiff left right">tc_</span>res_kind</span> <span class="n" style="color: #333;">args</span></span>
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1636
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1625
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<pre style="margin: 0;"> <span id="LC1625" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We don't need to check the telescope here,</span></span>
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1637
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1626
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<pre style="margin: 0;"> <span id="LC1626" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- because that's done in tcConDecl</span></span>
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1638
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1627
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<pre style="margin: 0;"> <span id="LC1627" class="line" lang="haskell"> <span class="p">}</span></span>
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1639
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1628
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<pre style="margin: 0;"> <span id="LC1628" class="line" lang="haskell"></span>
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1640
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<pre style="margin: 0;">-<span id="LC1640" class="line" lang="haskell"><span class="n" style="color: #333;">kcConDecl</span> <span class="n" style="color: #333;">new_or_data</span> <span class="n" style="color: #333;">res_kind</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ConDeclGADT</span></span>
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1629
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<pre style="margin: 0;">+<span id="LC1629" class="line" lang="haskell"><span class="n" style="color: #333;">kcConDecl</span> <span class="n" style="color: #333;">new_or_data</span></span>
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1630
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<pre style="margin: 0;">+<span id="LC1630" class="line" lang="haskell"> <span class="n" style="color: #333;">_tc_res_kind</span> <span class="c1" style="color: #998; font-style: italic;">-- Not used in GADT case (and doesn't make sense)</span></span>
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1631
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<pre style="margin: 0;">+<span id="LC1631" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ConDeclGADT</span></span>
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1641
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1632
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<pre style="margin: 0;"> <span id="LC1632" 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 class="p">,</span> <span class="n" style="color: #333;">con_bndrs</span> <span class="o" style="font-weight: 600;">=</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;">outer_bndrs</span><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;">cxt</span></span>
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1642
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1633
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<pre style="margin: 0;"> <span id="LC1633" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">con_g_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 class="p">})</span></span>
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1643
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<pre style="margin: 0;">-<span id="LC1643" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- Even though the GADT-style data constructor's type is closed,</span></span>
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1644
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<pre style="margin: 0;">-<span id="LC1644" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we must still kind-check the type, because that may influence</span></span>
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1645
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<pre style="margin: 0;">-<span id="LC1645" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the inferred kind of the /type/ constructor. Example:</span></span>
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1646
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<pre style="margin: 0;">-<span id="LC1646" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- data T f a where</span></span>
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1647
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<pre style="margin: 0;">-<span id="LC1647" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- MkT :: f a -> T f a</span></span>
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1648
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<pre style="margin: 0;">-<span id="LC1648" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If we don't look at MkT we won't get the correct kind</span></span>
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1649
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<pre style="margin: 0;">-<span id="LC1649" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- for the type constructor T</span></span>
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1634
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<pre style="margin: 0;">+<span id="LC1634" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [kcConDecls: kind-checking data type decls]</span></span>
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1650
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1635
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<pre style="margin: 0;"> <span id="LC1635" class="line" lang="haskell"> <span class="n" style="color: #333;">addErrCtxt</span> <span class="p">(</span><span class="n" style="color: #333;">dataConCtxtName</span> <span class="n" style="color: #333;">names</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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1651
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1636
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<pre style="margin: 0;"> <span id="LC1636" class="line" lang="haskell"> <span class="n" style="color: #333;">discardResult</span> <span class="o" style="font-weight: 600;">$</span></span>
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1652
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1637
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<pre style="margin: 0;"> <span id="LC1637" class="line" lang="haskell"> <span class="n" style="color: #333;">bindOuterSigTKBndrs_Tv</span> <span class="n" style="color: #333;">outer_bndrs</span> <span class="o" style="font-weight: 600;">$</span></span>
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1653
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<pre style="margin: 0;">-<span id="LC1653" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Why "_Tv"? See Note [<span class="idiff left right">Kind-checking for</span> GADTs]</span></span>
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1638
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<pre style="margin: 0;">+<span id="LC1638" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Why "_Tv"? See Note [<span class="idiff left right">Using TyVarTvs for kind-checking</span> GADTs]</span></span>
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1654
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1639
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<pre style="margin: 0;"> <span id="LC1639" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcHsMbContext</span> <span class="n" style="color: #333;">cxt</span></span>
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1655
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<pre style="margin: 0;">-<span id="LC1655" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">kcConGADTArgs</span> <span class="n" style="color: #333;">new_or_data</span> <span class="n" style="color: #333;">res_kind</span> <span class="n" style="color: #333;">args</span></span>
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1656
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<pre style="margin: 0;">-<span id="LC1656" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcHsOpenType</span> <span class="n" style="color: #333;">res_ty</span></span>
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1640
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<pre style="margin: 0;">+<span id="LC1640" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"kcConDecl:GADT {"</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;">res_ty</span><span class="p">)</span></span>
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1641
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<pre style="margin: 0;">+<span id="LC1641" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">con_res_kind</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newOpenTypeKind</span></span>
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1642
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<pre style="margin: 0;">+<span id="LC1642" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcCheckLHsType</span> <span class="n" style="color: #333;">res_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TheKind</span> <span class="n" style="color: #333;">con_res_kind</span><span class="p">)</span></span>
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1643
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<pre style="margin: 0;">+<span id="LC1643" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">kcConGADTArgs</span> <span class="n" style="color: #333;">new_or_data</span> <span class="n" style="color: #333;">con_res_kind</span> <span class="n" style="color: #333;">args</span></span>
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1644
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<pre style="margin: 0;">+<span id="LC1644" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"kcConDecl:GADT }"</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;">con_res_kind</span><span class="p">)</span></span>
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1657
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1645
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<pre style="margin: 0;"> <span id="LC1645" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span> <span class="p">}</span></span>
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1658
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1646
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<pre style="margin: 0;"> <span id="LC1646" class="line" lang="haskell"></span>
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1659
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<pre style="margin: 0;">-<span id="LC1659" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [kcConDecls result kind]</span></span>
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1660
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<pre style="margin: 0;">-<span id="LC1660" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1661
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<pre style="margin: 0;">-<span id="LC1661" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We might have e.g.</span></span>
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1662
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<pre style="margin: 0;">-<span id="LC1662" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T a :: Type -> Type where ...</span></span>
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1663
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<pre style="margin: 0;">-<span id="LC1663" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">or</span></span>
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1664
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<pre style="margin: 0;">-<span id="LC1664" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> newtype instance N a :: Type -> Type where ..</span></span>
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1665
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<pre style="margin: 0;">-<span id="LC1665" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in which case, the 'res_kind' passed to kcConDecls will be</span></span>
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1666
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<pre style="margin: 0;">-<span id="LC1666" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Type->Type</span></span>
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1667
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<pre style="margin: 0;">-<span id="LC1667" class="line" lang="haskell"></span>
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1668
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<pre style="margin: 0;">-<span id="LC1668" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We must look past those arrows, or even foralls, to the Type in the</span></span>
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1669
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<pre style="margin: 0;">-<span id="LC1669" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">corner, to pass to kcConDecl c.f. #16828. Hence the splitPiTys here.</span></span>
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1670
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<pre style="margin: 0;">-<span id="LC1670" class="line" lang="haskell"></span>
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1671
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<pre style="margin: 0;">-<span id="LC1671" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">I am a bit concerned about tycons with a declaration like</span></span>
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1672
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<pre style="margin: 0;">-<span id="LC1672" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T a :: Type -> forall k. k -> Type where ...</span></span>
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1673
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<pre style="margin: 0;">-<span id="LC1673" class="line" lang="haskell"></span>
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1674
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<pre style="margin: 0;">-<span id="LC1674" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">It does not have a CUSK, so kcInferDeclHeader will make a TcTyCon</span></span>
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1675
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<pre style="margin: 0;">-<span id="LC1675" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with tyConResKind of Type -> forall k. k -> Type. Even that is fine:</span></span>
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1676
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<pre style="margin: 0;">-<span id="LC1676" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the splitPiTys will look past the forall. But I'm bothered about</span></span>
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1677
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<pre style="margin: 0;">-<span id="LC1677" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">what if the type "in the corner" mentions k? This is incredibly</span></span>
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1678
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<pre style="margin: 0;">-<span id="LC1678" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">obscure but something like this could be bad:</span></span>
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1679
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<pre style="margin: 0;">-<span id="LC1679" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T a :: Type -> foral k. k -> TYPE (F k) where ...</span></span>
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1680
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<pre style="margin: 0;">-<span id="LC1680" class="line" lang="haskell"></span>
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1681
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<pre style="margin: 0;">-<span id="LC1681" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">I bet we are not quite right here, but my brain suffered a buffer</span></span>
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1682
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<pre style="margin: 0;">-<span id="LC1682" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">overflow and I thought it best to nail the common cases right now.</span></span>
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1683
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<pre style="margin: 0;">-<span id="LC1683" class="line" lang="haskell"></span>
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1684
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<pre style="margin: 0;">-<span id="LC1684" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Recursion and promoting data constructors]</span></span>
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1685
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<pre style="margin: 0;">-<span id="LC1685" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1686
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<pre style="margin: 0;">-<span id="LC1686" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We don't want to allow promotion in a strongly connected component</span></span>
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1687
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<pre style="margin: 0;">-<span id="LC1687" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">when kind checking.</span></span>
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1688
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<pre style="margin: 0;">-<span id="LC1688" class="line" lang="haskell"></span>
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1689
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<pre style="margin: 0;">-<span id="LC1689" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider:</span></span>
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1690
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<pre style="margin: 0;">-<span id="LC1690" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T f = K (f (K Any))</span></span>
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1691
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<pre style="margin: 0;">-<span id="LC1691" class="line" lang="haskell"></span>
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1692
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<pre style="margin: 0;">-<span id="LC1692" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">When kind checking the `data T' declaration the local env contains the</span></span>
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1693
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<pre style="margin: 0;">-<span id="LC1693" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">mappings:</span></span>
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1694
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<pre style="margin: 0;">-<span id="LC1694" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> T -> ATcTyCon <some initial kind></span></span>
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1695
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<pre style="margin: 0;">-<span id="LC1695" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> K -> APromotionErr</span></span>
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1696
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<pre style="margin: 0;">-<span id="LC1696" class="line" lang="haskell"></span>
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1697
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<pre style="margin: 0;">-<span id="LC1697" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">APromotionErr is only used for DataCons, and only used during type checking</span></span>
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1698
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<pre style="margin: 0;">-<span id="LC1698" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in tcTyClGroup.</span></span>
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1699
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<pre style="margin: 0;">-<span id="LC1699" class="line" lang="haskell"></span>
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1700
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<pre style="margin: 0;">-<span id="LC1700" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Kind-checking for GADTs]</span></span>
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1701
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<pre style="margin: 0;">-<span id="LC1701" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1647
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<pre style="margin: 0;">+<span id="LC1647" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [kcConDecls: kind-checking data type decls]</span></span>
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1648
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<pre style="margin: 0;">+<span id="LC1648" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1649
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<pre style="margin: 0;">+<span id="LC1649" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">kcConDecls is used when we are inferring the kind of the type</span></span>
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1650
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<pre style="margin: 0;">+<span id="LC1650" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">constructor in a data type declaration. E.g.</span></span>
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1651
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<pre style="margin: 0;">+<span id="LC1651" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T f a = MkT (f a)</span></span>
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1652
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<pre style="margin: 0;">+<span id="LC1652" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we want to infer the kind of 'f' and 'a'. The basic plan is described</span></span>
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1653
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<pre style="margin: 0;">+<span id="LC1653" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in Note [Inferring kinds for type declarations]; here are doing Step 2.</span></span>
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1654
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<pre style="margin: 0;">+<span id="LC1654" class="line" lang="haskell"></span>
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1655
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<pre style="margin: 0;">+<span id="LC1655" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In the H98 case, for unlifted newtypes only, we need the result kind of</span></span>
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1656
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<pre style="margin: 0;">+<span id="LC1656" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the TyCon, to unify with the argument kind. The tycon's result kind</span></span>
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1657
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<pre style="margin: 0;">+<span id="LC1657" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is not used at all in the GADT case.</span></span>
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1658
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<pre style="margin: 0;">+<span id="LC1658" class="line" lang="haskell"></span>
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1659
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<pre style="margin: 0;">+<span id="LC1659" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In the GADT case we may have this:</span></span>
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1660
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<pre style="margin: 0;">+<span id="LC1660" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T f a where</span></span>
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1661
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<pre style="margin: 0;">+<span id="LC1661" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkT :: forall g b. g b -> T g b</span></span>
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1662
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<pre style="margin: 0;">+<span id="LC1662" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Notice that the variables f,a, and g,b are quite distinct.</span></span>
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1663
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<pre style="margin: 0;">+<span id="LC1663" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Nevertheless, this decl must still influence the kind T (which is,</span></span>
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1664
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<pre style="margin: 0;">+<span id="LC1664" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">remember Step 1, something like T :: kappa1 -> kappa2 -> Type), otherwise</span></span>
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1665
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<pre style="margin: 0;">+<span id="LC1665" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we'd infer the bogus kind T :: forall k1 k2. k1 -> k2 -> Type.</span></span>
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1666
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<pre style="margin: 0;">+<span id="LC1666" class="line" lang="haskell"></span>
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1667
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<pre style="margin: 0;">+<span id="LC1667" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The data constructor type influences the kind of T simply by</span></span>
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1668
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<pre style="margin: 0;">+<span id="LC1668" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">kind-checking the result type (T g b), which will force 'f' and 'g' to</span></span>
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1669
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<pre style="margin: 0;">+<span id="LC1669" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">have the same kinds. This is the call to</span></span>
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1670
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<pre style="margin: 0;">+<span id="LC1670" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> tcCheckLHsType res_ty (TheKind con_res_kind)</span></span>
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1671
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<pre style="margin: 0;">+<span id="LC1671" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Because this is the result type of an arrow, we know the kind must be</span></span>
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1672
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<pre style="margin: 0;">+<span id="LC1672" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of form (TYPE rr), and we get better error messages if we enforce that</span></span>
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1673
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<pre style="margin: 0;">+<span id="LC1673" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">here (e.g. test gadt10).</span></span>
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<pre style="margin: 0;">+<span id="LC1674" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1675" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Using TyVarTvs for kind-checking GADTs]</span></span>
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1676
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<pre style="margin: 0;">+<span id="LC1676" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1677
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<pre style="margin: 0;"> <span id="LC1677" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider</span></span>
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1703
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1678
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<pre style="margin: 0;"> <span id="LC1678" class="line" lang="haskell"></span>
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1704
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1679
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<pre style="margin: 0;"> <span id="LC1679" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data Proxy a where</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">@@ -1708,26 +1683,27 @@ Consider</td>
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1708
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1683
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<pre style="margin: 0;"> <span id="LC1683" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">It seems reasonable that this should be accepted. But something very strange</span></span>
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1709
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1684
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<pre style="margin: 0;"> <span id="LC1684" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is going on here: when we're kind-checking this declaration, we need to unify</span></span>
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1685
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<pre style="margin: 0;"> <span id="LC1685" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the kind of `a` with k and j -- even though k and j's scopes are local to the type of</span></span>
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1711
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<pre style="margin: 0;">-<span id="LC1711" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">MkProxy{1,2}. The best approach we've come up with is to use TyVarTvs during</span></span>
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1712
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<pre style="margin: 0;">-<span id="LC1712" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the kind-checking pass. First off, note that it's OK if the kind-checking pass</span></span>
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1713
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<pre style="margin: 0;">-<span id="LC1713" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is too permissive: we'll snag the problems in the type-checking pass later.</span></span>
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1714
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<pre style="margin: 0;">-<span id="LC1714" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(This extra permissiveness might happen with something like</span></span>
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<pre style="margin: 0;">+<span id="LC1686" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">MkProxy{1,2}.</span></span>
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<pre style="margin: 0;">+<span id="LC1687" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1688" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In effect, we are simply gathering constraints on the shape of Proxy's</span></span>
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1689
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<pre style="margin: 0;">+<span id="LC1689" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">kind, with no skolemisation or implication constraints involved at all.</span></span>
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1690
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<pre style="margin: 0;">+<span id="LC1690" class="line" lang="haskell"></span>
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1691
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<pre style="margin: 0;">+<span id="LC1691" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The best approach we've come up with is to use TyVarTvs during the</span></span>
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1692
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<pre style="margin: 0;">+<span id="LC1692" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">kind-checking pass, rather than ordinary skolems. This is why we use</span></span>
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1693
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<pre style="margin: 0;">+<span id="LC1693" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the "_Tv" variant, bindOuterSigTKBndrs_Tv.</span></span>
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1694
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<pre style="margin: 0;">+<span id="LC1694" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1695" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Our only goal is to gather constraints on the kind of the type constructor;</span></span>
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1696
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<pre style="margin: 0;">+<span id="LC1696" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we do not certify that the data declaration is well-kinded. For example:</span></span>
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1715
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1697
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<pre style="margin: 0;"> <span id="LC1697" class="line" lang="haskell"></span>
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1716
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1698
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<pre style="margin: 0;"> <span id="LC1698" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data SameKind :: k -> k -> Type</span></span>
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1717
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1699
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<pre style="margin: 0;"> <span id="LC1699" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data Bad a where</span></span>
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1718
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1700
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<pre style="margin: 0;"> <span id="LC1700" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkBad :: forall k1 k2 (a :: k1) (b :: k2). Bad (SameKind a b)</span></span>
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1719
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1701
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<pre style="margin: 0;"> <span id="LC1701" class="line" lang="haskell"></span>
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1720
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<pre style="margin: 0;">-<span id="LC1720" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">which would be accepted if k1 and k2 were TyVarTvs. This is correctly rejected</span></span>
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1721
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<pre style="margin: 0;">-<span id="LC1721" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in the second pass, though. Test case: polykinds/TyVarTvKinds3)</span></span>
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1722
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<pre style="margin: 0;">-<span id="LC1722" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Recall that the kind-checking pass exists solely to collect constraints</span></span>
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1723
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<pre style="margin: 0;">-<span id="LC1723" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">on the kinds and to power unification.</span></span>
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1724
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<pre style="margin: 0;">-<span id="LC1724" class="line" lang="haskell"></span>
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1725
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<pre style="margin: 0;">-<span id="LC1725" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">To achieve the use of TyVarTvs, we must be careful to use specialized functions</span></span>
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1726
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<pre style="margin: 0;">-<span id="LC1726" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that produce TyVarTvs, not ordinary skolems. This is why we need</span></span>
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1727
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<pre style="margin: 0;">-<span id="LC1727" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">kcExplicitTKBndrs and kcImplicitTKBndrs in GHC.Tc.Gen.HsType, separate from their</span></span>
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1728
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<pre style="margin: 0;">-<span id="LC1728" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">tc... variants.</span></span>
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1702
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<pre style="margin: 0;">+<span id="LC1702" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">which would be accepted by kcConDecl because k1 and k2 are</span></span>
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1703
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<pre style="margin: 0;">+<span id="LC1703" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">TyVarTvs. It is correctly rejected in the second pass, tcConDecl. Test</span></span>
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1704
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<pre style="margin: 0;">+<span id="LC1704" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">case: polykinds/TyVarTvKinds3)</span></span>
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1729
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1705
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<pre style="margin: 0;"> <span id="LC1705" class="line" lang="haskell"></span>
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1730
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<pre style="margin: 0;">-<span id="LC1730" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">Th</span>e drawback of this approach is sometimes it will accept a definition that</span></span>
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1706
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<pre style="margin: 0;">+<span id="LC1706" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">On</span>e drawback of this approach is sometimes it will accept a definition that</span></span>
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1731
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1707
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<pre style="margin: 0;"> <span id="LC1707" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">a (hypothetical) declarative specification would likely reject. As a general</span></span>
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1732
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1708
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<pre style="margin: 0;"> <span id="LC1708" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">rule, we don't want to allow polymorphic recursion without a CUSK. Indeed,</span></span>
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1733
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1709
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<pre style="margin: 0;"> <span id="LC1709" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the whole point of CUSKs is to allow polymorphic recursion. Yet, the TyVarTvs</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">@@ -1746,6 +1722,23 @@ be rejected (without a CUSK). However, the accepted definitions are indeed</td>
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1746
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1722
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<pre style="margin: 0;"> <span id="LC1722" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">well-kinded and any rejected definitions would be accepted with a CUSK,</span></span>
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1747
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1723
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<pre style="margin: 0;"> <span id="LC1723" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and so this wrinkle need not cause anyone to lose sleep.</span></span>
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1748
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1724
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<pre style="margin: 0;"> <span id="LC1724" class="line" lang="haskell"></span>
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1725
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<pre style="margin: 0;">+<span id="LC1725" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Recursion and promoting data constructors]</span></span>
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1726
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<pre style="margin: 0;">+<span id="LC1726" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1727
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<pre style="margin: 0;">+<span id="LC1727" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We don't want to allow promotion in a strongly connected component</span></span>
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1728
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<pre style="margin: 0;">+<span id="LC1728" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">when kind checking.</span></span>
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1729
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<pre style="margin: 0;">+<span id="LC1729" class="line" lang="haskell"></span>
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1730
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<pre style="margin: 0;">+<span id="LC1730" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider:</span></span>
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1731
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<pre style="margin: 0;">+<span id="LC1731" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T f = K (f (K Any))</span></span>
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1732
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<pre style="margin: 0;">+<span id="LC1732" class="line" lang="haskell"></span>
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1733
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<pre style="margin: 0;">+<span id="LC1733" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">When kind checking the `data T' declaration the local env contains the</span></span>
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1734
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<pre style="margin: 0;">+<span id="LC1734" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">mappings:</span></span>
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1735
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<pre style="margin: 0;">+<span id="LC1735" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> T -> ATcTyCon <some initial kind></span></span>
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1736
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<pre style="margin: 0;">+<span id="LC1736" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> K -> APromotionErr</span></span>
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1737
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<pre style="margin: 0;">+<span id="LC1737" class="line" lang="haskell"></span>
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1738
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<pre style="margin: 0;">+<span id="LC1738" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">APromotionErr is only used for DataCons, and only used during type checking</span></span>
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1739
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<pre style="margin: 0;">+<span id="LC1739" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in tcTyClGroup.</span></span>
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1740
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<pre style="margin: 0;">+<span id="LC1740" class="line" lang="haskell"></span>
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1741
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<pre style="margin: 0;">+<span id="LC1741" class="line" lang="haskell"></span>
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1749
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1742
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<pre style="margin: 0;"> <span id="LC1742" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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1750
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1743
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<pre style="margin: 0;"> <span id="LC1743" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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1751
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<pre style="margin: 0;"> <span id="LC1744" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">\subsection{Type checking}</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">@@ -3214,7 +3207,7 @@ tcConDecl :: KnotTied TyCon -- Representation tycon. Knot-tied!</td>
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3214
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3207
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<pre style="margin: 0;"> <span id="LC3207" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ConDecl</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span></span>
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3215
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3208
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<pre style="margin: 0;"> <span id="LC3208" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">DataCon</span><span class="p">]</span></span>
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3216
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3209
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<pre style="margin: 0;"> <span id="LC3209" class="line" lang="haskell"></span>
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3217
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<pre style="margin: 0;">-<span id="LC3217" class="line" lang="haskell"><span class="n" style="color: #333;">tcConDecl</span> <span class="n" style="color: #333;">rep_tycon</span> <span class="n" style="color: #333;">tag_map</span> <span class="n" style="color: #333;">t<span class="idiff left right">mpl</span>_bndrs</span> <span class="n" style="color: #333;">res_kind</span> <span class="n" style="color: #333;">res_tmpl</span> <span class="n" style="color: #333;">new_or_data</span></span>
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3210
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<pre style="margin: 0;">+<span id="LC3210" class="line" lang="haskell"><span class="n" style="color: #333;">tcConDecl</span> <span class="n" style="color: #333;">rep_tycon</span> <span class="n" style="color: #333;">tag_map</span> <span class="n" style="color: #333;">t<span class="idiff left right">c</span>_bndrs</span> <span class="n" style="color: #333;">res_kind</span> <span class="n" style="color: #333;">res_tmpl</span> <span class="n" style="color: #333;">new_or_data</span></span>
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3218
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3211
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<pre style="margin: 0;"> <span id="LC3211" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ConDeclH98</span> <span class="p">{</span> <span class="n" style="color: #333;">con_name</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lname</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="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">name</span><span class="p">)</span></span>
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3219
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3212
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<pre style="margin: 0;"> <span id="LC3212" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">con_ex_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">explicit_tkv_nms</span></span>
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3220
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3213
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<pre style="margin: 0;"> <span id="LC3213" 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;">hs_ctxt</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="3224" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="3217" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -3224,7 +3217,7 @@ tcConDecl rep_tycon tag_map tmpl_bndrs res_kind res_tmpl new_or_data</td>
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3224
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3217
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<pre style="margin: 0;"> <span id="LC3217" class="line" lang="haskell"></span>
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3225
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3218
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<pre style="margin: 0;"> <span id="LC3218" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Get hold of the existential type variables</span></span>
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3226
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3219
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<pre style="margin: 0;"> <span id="LC3219" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- e.g. data T a = forall k (b::k) f. MkT a (f b)</span></span>
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3227
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<pre style="margin: 0;">-<span id="LC3227" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Here t<span class="idiff left right">mpl</span>_bndrs = {a}</span></span>
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3220
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<pre style="margin: 0;">+<span id="LC3220" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Here t<span class="idiff left right">c</span>_bndrs = {a}</span></span>
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3228
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3221
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<pre style="margin: 0;"> <span id="LC3221" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- hs_qvars = HsQTvs { hsq_implicit = {k}</span></span>
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3229
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3222
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<pre style="margin: 0;"> <span id="LC3222" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- , hsq_explicit = {f,b} }</span></span>
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3230
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3223
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<pre style="margin: 0;"> <span id="LC3223" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="3235" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -3242,29 +3235,35 @@ tcConDecl rep_tycon tag_map tmpl_bndrs res_kind res_tmpl new_or_data</td>
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3242
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3235
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<pre style="margin: 0;"> <span id="LC3235" class="line" lang="haskell"> <span class="p">}</span></span>
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3243
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3236
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<pre style="margin: 0;"> <span id="LC3236" class="line" lang="haskell"></span>
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3244
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3237
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<pre style="margin: 0;"> <span id="LC3237" class="line" lang="haskell"></span>
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3245
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<pre style="margin: 0;">-<span id="LC3245" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">t<span class="idiff left">mpl_tvs</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">binderVars</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">tmpl</span>_bndrs</span></span>
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3246
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<pre style="margin: 0;">-<span id="LC3246" class="line" lang="haskell"> <span class="p"><span class="idiff left">;</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">let</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fake_ty</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">mkSpecForAllTys</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">tmpl_tvs</span></span> <span class="o" style="font-weight: 600;">$</span></span>
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3238
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<pre style="margin: 0;">+<span id="LC3238" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">t<span class="idiff left">c_tvs</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">binderVars</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">tc</span>_bndrs</span></span>
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3239
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<pre style="margin: 0;">+<span id="LC3239" class="line" lang="haskell"> <span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff">fake_ty</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">mkSpecForAllTys</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tc_tvs</span></span><span class="idiff right"> </span> <span class="o" style="font-weight: 600;">$</span></span>
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3247
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3240
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<pre style="margin: 0;"> <span id="LC3240" class="line" lang="haskell"> <span class="n" style="color: #333;">mkInvisForAllTys</span> <span class="n" style="color: #333;">exp_tvbndrs</span> <span class="o" style="font-weight: 600;">$</span></span>
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3248
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3241
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<pre style="margin: 0;"> <span id="LC3241" class="line" lang="haskell"> <span class="n" style="color: #333;">mkPhiTy</span> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;">$</span></span>
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3249
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3242
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<pre style="margin: 0;"> <span id="LC3242" class="line" lang="haskell"> <span class="n" style="color: #333;">mkVisFunTys</span> <span class="n" style="color: #333;">arg_tys</span> <span class="o" style="font-weight: 600;">$</span></span>
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3250
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3243
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<pre style="margin: 0;"> <span id="LC3243" class="line" lang="haskell"> <span class="n" style="color: #333;">unitTy</span></span>
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3251
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3244
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<pre style="margin: 0;"> <span id="LC3244" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- That type is a lie, of course. (It shouldn't end in ()!)</span></span>
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3252
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3245
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<pre style="margin: 0;"> <span id="LC3245" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- And we could construct a proper result type from the info</span></span>
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3253
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<pre style="margin: 0;">-<span id="LC3253" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- at hand. But the result would mention only the <span class="idiff left right">tmpl</span>_tvs,</span></span>
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3246
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<pre style="margin: 0;">+<span id="LC3246" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- at hand. But the result would mention only the <span class="idiff left right">univ</span>_tvs,</span></span>
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3254
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3247
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<pre style="margin: 0;"> <span id="LC3247" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- and so it just creates more work to do it right. Really,</span></span>
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3255
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3248
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<pre style="margin: 0;"> <span id="LC3248" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we're only doing this to find the right kind variables to</span></span>
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3256
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3249
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<pre style="margin: 0;"> <span id="LC3249" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- quantify over, and this type is fine for that purpose.</span></span>
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3257
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3250
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<pre style="margin: 0;"> <span id="LC3250" class="line" lang="haskell"></span>
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3258
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<pre style="margin: 0;">-<span id="LC3258" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- exp_tvs have explicit, user-written binding sites</span></span>
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3251
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<pre style="margin: 0;">+<span id="LC3251" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- exp_tv<span class="idiff left right">bndr</span>s have explicit, user-written binding sites</span></span>
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3259
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3252
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<pre style="margin: 0;"> <span id="LC3252" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the kvs below are those kind variables entirely unmentioned by the user</span></span>
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3260
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3253
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<pre style="margin: 0;"> <span id="LC3253" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- and discovered only by generalization</span></span>
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3261
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3254
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<pre style="margin: 0;"> <span id="LC3254" class="line" lang="haskell"></span>
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3262
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3255
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<pre style="margin: 0;"> <span id="LC3255" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">kvs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">kindGeneralizeAll</span> <span class="n" style="color: #333;">fake_ty</span></span>
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3263
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3256
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<pre style="margin: 0;"> <span id="LC3256" class="line" lang="haskell"></span>
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3264
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<pre style="margin: 0;">-<span id="LC3264" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">skol_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left">kvs</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">++</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">tmpl_tv</span>s</span></span>
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3257
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<pre style="margin: 0;">+<span id="LC3257" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">skol_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left">tc_tvs</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">++</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">kvs</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">++</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">binderVars</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">exp_tvbndr</span>s</span></span>
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3265
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3258
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<pre style="margin: 0;"> <span id="LC3258" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">reportUnsolvedEqualities</span> <span class="n" style="color: #333;">skol_info</span> <span class="n" style="color: #333;">skol_tvs</span> <span class="n" style="color: #333;">tclvl</span> <span class="n" style="color: #333;">wanted</span></span>
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3266
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<pre style="margin: 0;">-<span id="LC3266" class="line" lang="haskell"></span>
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3267
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<pre style="margin: 0;">-<span id="LC3267" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Zonk to Types</span></span>
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3259
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<pre style="margin: 0;">+<span id="LC3259" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The skol_info claims that all the variables are bound</span></span>
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3260
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<pre style="margin: 0;">+<span id="LC3260" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- by the data constructor decl, whereas actually the</span></span>
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3261
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<pre style="margin: 0;">+<span id="LC3261" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- univ_tvs are bound by the data type decl itself. It</span></span>
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3262
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<pre style="margin: 0;">+<span id="LC3262" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- would be better to have a doubly-nested implication.</span></span>
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3263
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<pre style="margin: 0;">+<span id="LC3263" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- But that just doesn't seem worth it.</span></span>
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3264
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<pre style="margin: 0;">+<span id="LC3264" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See test dependent/should_fail/T13780a</span></span>
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3265
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<pre style="margin: 0;">+<span id="LC3265" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3266" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Zonk to Types</span></span>
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<pre style="margin: 0;"> <span id="LC3267" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">ze</span><span class="p">,</span> <span class="n" style="color: #333;">qkvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkTyBndrs</span> <span class="n" style="color: #333;">kvs</span></span>
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3269
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3268
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<pre style="margin: 0;"> <span id="LC3268" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">ze</span><span class="p">,</span> <span class="n" style="color: #333;">user_qtvbndrs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkTyVarBindersX</span> <span class="n" style="color: #333;">ze</span> <span class="n" style="color: #333;">exp_tvbndrs</span></span>
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3270
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3269
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<pre style="margin: 0;"> <span id="LC3269" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">arg_tys</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkScaledTcTypesToTypesX</span> <span class="n" style="color: #333;">ze</span> <span class="n" style="color: #333;">arg_tys</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">@@ -3272,15 +3271,13 @@ tcConDecl rep_tycon tag_map tmpl_bndrs res_kind res_tmpl new_or_data</td>
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3272
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3271
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<pre style="margin: 0;"> <span id="LC3271" class="line" lang="haskell"></span>
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3273
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3272
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<pre style="margin: 0;"> <span id="LC3272" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Can't print univ_tvs, arg_tys etc, because we are inside the knot here</span></span>
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3274
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3273
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<pre style="margin: 0;"> <span id="LC3273" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tcConDecl 2"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">field_lbls</span><span class="p">)</span></span>
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3275
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<pre style="margin: 0;">-<span id="LC3275" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span></span>
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3276
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<pre style="margin: 0;">-<span id="LC3276" class="line" lang="haskell"> <span class="n" style="color: #333;">univ_tvbs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyConInvisTVBinders</span> <span class="n" style="color: #333;">tmpl_bndrs</span></span>
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3277
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<pre style="margin: 0;">-<span id="LC3277" class="line" lang="haskell"> <span class="n" style="color: #333;">univ_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">binderVars</span> <span class="n" style="color: #333;">univ_tvbs</span></span>
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<pre style="margin: 0;">-<span id="LC3278" class="line" lang="haskell"> <span class="n" style="color: #333;">ex_tvbs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyVarBinders</span> <span class="kt" style="color: #458; font-weight: 600;">InferredSpec</span> <span class="n" style="color: #333;">qkvs</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">user_qtvbndrs</span></span>
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<pre style="margin: 0;">-<span id="LC3279" class="line" lang="haskell"> <span class="n" style="color: #333;">ex_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">binderVars</span> <span class="n" style="color: #333;">ex_tvbs</span></span>
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<pre style="margin: 0;">-<span id="LC3280" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- For H98 datatypes, the user-written tyvar binders are precisely</span></span>
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<pre style="margin: 0;">-<span id="LC3281" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the universals followed by the existentials.</span></span>
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<pre style="margin: 0;">-<span id="LC3282" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [DataCon user type variable binders] in GHC.Core.DataCon.</span></span>
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<pre style="margin: 0;">-<span id="LC3283" class="line" lang="haskell"> <span class="n" style="color: #333;">user_tvbs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">univ_tvbs</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">ex_tvbs</span></span>
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<pre style="margin: 0;">+<span id="LC3274" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">univ_tvbs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyConInvisTVBinders</span> <span class="n" style="color: #333;">tc_bndrs</span></span>
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<pre style="margin: 0;">+<span id="LC3275" class="line" lang="haskell"> <span class="n" style="color: #333;">ex_tvbs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyVarBinders</span> <span class="kt" style="color: #458; font-weight: 600;">InferredSpec</span> <span class="n" style="color: #333;">qkvs</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">user_qtvbndrs</span></span>
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<pre style="margin: 0;">+<span id="LC3276" class="line" lang="haskell"> <span class="n" style="color: #333;">ex_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">binderVars</span> <span class="n" style="color: #333;">ex_tvbs</span></span>
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<pre style="margin: 0;">+<span id="LC3277" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- For H98 datatypes, the user-written tyvar binders are precisely</span></span>
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<pre style="margin: 0;">+<span id="LC3278" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the universals followed by the existentials.</span></span>
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<pre style="margin: 0;">+<span id="LC3279" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [DataCon user type variable binders] in GHC.Core.DataCon.</span></span>
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<pre style="margin: 0;">+<span id="LC3280" class="line" lang="haskell"> <span class="n" style="color: #333;">user_tvbs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">univ_tvbs</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">ex_tvbs</span></span>
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<pre style="margin: 0;"> <span id="LC3281" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3282" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tcConDecl 2"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">name</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC3283" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">is_infix</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcConIsInfixH98</span> <span class="n" style="color: #333;">name</span> <span class="n" style="color: #333;">hs_args</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">@@ -3288,7 +3285,7 @@ tcConDecl rep_tycon tag_map tmpl_bndrs res_kind res_tmpl new_or_data</td>
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<pre style="margin: 0;"> <span id="LC3285" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">fam_envs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcGetFamInstEnvs</span></span>
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<pre style="margin: 0;"> <span id="LC3286" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">dc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">buildDataCon</span> <span class="n" style="color: #333;">fam_envs</span> <span class="n" style="color: #333;">name</span> <span class="n" style="color: #333;">is_infix</span> <span class="n" style="color: #333;">rep_nm</span></span>
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3290
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<pre style="margin: 0;"> <span id="LC3287" class="line" lang="haskell"> <span class="n" style="color: #333;">stricts</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="n" style="color: #333;">field_lbls</span></span>
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<pre style="margin: 0;">-<span id="LC3291" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left right">univ</span>_tvs</span> <span class="n" style="color: #333;">ex_tvs</span> <span class="n" style="color: #333;">user_tvbs</span></span>
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<pre style="margin: 0;">+<span id="LC3288" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left right">tc</span>_tvs</span> <span class="n" style="color: #333;">ex_tvs</span> <span class="n" style="color: #333;">user_tvbs</span></span>
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3292
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3289
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<pre style="margin: 0;"> <span id="LC3289" class="line" lang="haskell"> <span class="p">[</span><span class="cm" style="color: #998; font-style: italic;">{- no eq_preds -}</span><span class="p">]</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">arg_tys</span></span>
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3293
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3290
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<pre style="margin: 0;"> <span id="LC3290" class="line" lang="haskell"> <span class="n" style="color: #333;">res_tmpl</span> <span class="n" style="color: #333;">rep_tycon</span> <span class="n" style="color: #333;">tag_map</span></span>
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3294
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3291
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<pre style="margin: 0;"> <span id="LC3291" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: we put data_tc, the type constructor gotten from the</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">@@ -3299,7 +3296,7 @@ tcConDecl rep_tycon tag_map tmpl_bndrs res_kind res_tmpl new_or_data</td>
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3296
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<pre style="margin: 0;"> <span id="LC3296" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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3300
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3297
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<pre style="margin: 0;"> <span id="LC3297" class="line" lang="haskell"> <span class="n" style="color: #333;">skol_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">DataConSkol</span> <span class="n" style="color: #333;">name</span></span>
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3301
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3298
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<pre style="margin: 0;"> <span id="LC3298" class="line" lang="haskell"></span>
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3302
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<pre style="margin: 0;">-<span id="LC3302" class="line" lang="haskell"><span class="n" style="color: #333;">tcConDecl</span> <span class="n" style="color: #333;">rep_tycon</span> <span class="n" style="color: #333;">tag_map</span> <span class="n" style="color: #333;">t<span class="idiff left right">mpl</span>_bndrs</span> <span class="n" style="color: #333;">_res_kind</span> <span class="n" style="color: #333;">res_tmpl</span> <span class="n" style="color: #333;">new_or_data</span></span>
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<pre style="margin: 0;">+<span id="LC3299" class="line" lang="haskell"><span class="n" style="color: #333;">tcConDecl</span> <span class="n" style="color: #333;">rep_tycon</span> <span class="n" style="color: #333;">tag_map</span> <span class="n" style="color: #333;">t<span class="idiff left right">c</span>_bndrs</span> <span class="n" style="color: #333;">_res_kind</span> <span class="n" style="color: #333;">res_tmpl</span> <span class="n" style="color: #333;">new_or_data</span></span>
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3300
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<pre style="margin: 0;"> <span id="LC3300" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: don't use res_kind here, as it's ill-scoped. Instead,</span></span>
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<pre style="margin: 0;"> <span id="LC3301" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we get the res_kind by typechecking the result type.</span></span>
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<pre style="margin: 0;"> <span id="LC3302" class="line" lang="haskell"> <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_names</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">names</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="3341" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -3344,7 +3341,7 @@ tcConDecl rep_tycon tag_map tmpl_bndrs _res_kind res_tmpl new_or_data</td>
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<pre style="margin: 0;"> <span id="LC3341" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">res_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkTcTypeToTypeX</span> <span class="n" style="color: #333;">ze</span> <span class="n" style="color: #333;">res_ty</span></span>
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3342
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<pre style="margin: 0;"> <span id="LC3342" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3343" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">univ_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">ex_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">tvbndrs'</span><span class="p">,</span> <span class="n" style="color: #333;">eq_preds</span><span class="p">,</span> <span class="n" style="color: #333;">arg_subst</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC3347" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rejigConRes</span> <span class="n" style="color: #333;">t<span class="idiff left right">mpl</span>_bndrs</span> <span class="n" style="color: #333;">res_tmpl</span> <span class="n" style="color: #333;">tvbndrs</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;">+<span id="LC3344" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rejigConRes</span> <span class="n" style="color: #333;">t<span class="idiff left right">c</span>_bndrs</span> <span class="n" style="color: #333;">res_tmpl</span> <span class="n" style="color: #333;">tvbndrs</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;"> <span id="LC3345" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Checking GADT return types]</span></span>
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<pre style="margin: 0;"> <span id="LC3346" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3347" class="line" lang="haskell"> <span class="n" style="color: #333;">ctxt'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substTys</span> <span class="n" style="color: #333;">arg_subst</span> <span class="n" style="color: #333;">ctxt</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">@@ -3532,9 +3529,9 @@ errors reported in one pass. See #7175, and #10836.</td>
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<pre style="margin: 0;"> <span id="LC3529" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- TI :: forall b1 c1. (b1 ~ c1) => b1 -> :R7T b1 c1</span></span>
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<pre style="margin: 0;"> <span id="LC3530" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- In this case orig_res_ty = T (e,e)</span></span>
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3534
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3531
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<pre style="margin: 0;"> <span id="LC3531" class="line" lang="haskell"></span>
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3535
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<pre style="margin: 0;">-<span id="LC3535" class="line" lang="haskell"><span class="n" style="color: #333;">rejigConRes</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">KnotTied</span> <span class="kt" style="color: #458; font-weight: 600;">TyConBinder</span><span class="p">]</span> <span class="o" style="font-weight: 600;"><span class="idiff left">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">KnotTied</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Type</span></span><span class="idiff right"> </span> <span class="c1" style="color: #998; font-style: italic;">-- Template for result type; e.g.</span></span>
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3536
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<pre style="margin: 0;">-<span id="LC3536" class="line" lang="haskell"> <span class="idiff left right"> </span> <span class="c1" style="color: #998; font-style: italic;">-- data instance T [a] b c ...</span></span>
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3537
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<pre style="margin: 0;">-<span id="LC3537" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- gives template ([a,b,c], T [a] b c)</span></span>
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<pre style="margin: 0;">+<span id="LC3532" class="line" lang="haskell"><span class="n" style="color: #333;">rejigConRes</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">KnotTied</span> <span class="kt" style="color: #458; font-weight: 600;">TyConBinder</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- Template for result type; e.g.</span></span>
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<pre style="margin: 0;">+<span id="LC3533" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><span class="idiff left">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">KnotTied</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Type</span></span> <span class="c1" style="color: #998; font-style: italic;">-- data instance T [a] b c ...</span></span>
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<pre style="margin: 0;">+<span id="LC3534" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="c1" style="color: #998; font-style: italic;">-- gives template ([a,b,c], T [a] b c)</span></span>
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3535
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<pre style="margin: 0;"> <span id="LC3535" 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;">InvisTVBinder</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- The constructor's type variables (both inferred and user-written)</span></span>
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3539
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<pre style="margin: 0;"> <span id="LC3536" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">KnotTied</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="c1" style="color: #998; font-style: italic;">-- res_ty</span></span>
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<pre style="margin: 0;"> <span id="LC3537" 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;">TyVar</span><span class="p">],</span> <span class="c1" style="color: #998; font-style: italic;">-- Universal</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">@@ -3546,10 +3543,10 @@ rejigConRes :: [KnotTied TyConBinder] -> KnotTied Type -- Template for result</td>
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<pre style="margin: 0;"> <span id="LC3543" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We don't check that the TyCon given in the ResTy is</span></span>
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<pre style="margin: 0;"> <span id="LC3544" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the same as the parent tycon, because checkValidDataCon will do it</span></span>
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<pre style="margin: 0;"> <span id="LC3545" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- NB: All arguments may potentially be knot-tied</span></span>
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<pre style="margin: 0;">-<span id="LC3549" class="line" lang="haskell"><span class="n" style="color: #333;">rejigConRes</span> <span class="n" style="color: #333;">t<span class="idiff left right">mpl_</span>bndrs</span> <span class="n" style="color: #333;">res_tmpl</span> <span class="n" style="color: #333;">dc_tvbndrs</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;">+<span id="LC3546" class="line" lang="haskell"><span class="n" style="color: #333;">rejigConRes</span> <span class="n" style="color: #333;">t<span class="idiff left right">c_tv</span>bndrs</span> <span class="n" style="color: #333;">res_tmpl</span> <span class="n" style="color: #333;">dc_tvbndrs</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;"> <span id="LC3547" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- E.g. data T [a] b c where</span></span>
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<pre style="margin: 0;"> <span id="LC3548" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- MkT :: forall x y z. T [(x,y)] z z</span></span>
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<pre style="margin: 0;">-<span id="LC3552" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The {a,b,c} are the t<span class="idiff left right">mpl</span>_tvs, and the {x,y,z} are the dc_tvs</span></span>
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<pre style="margin: 0;">+<span id="LC3549" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The {a,b,c} are the t<span class="idiff left right">c</span>_tvs, and the {x,y,z} are the dc_tvs</span></span>
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3550
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<pre style="margin: 0;"> <span id="LC3550" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (NB: unlike the H98 case, the dc_tvs are not all existential)</span></span>
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3554
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3551
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<pre style="margin: 0;"> <span id="LC3551" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Then we generate</span></span>
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3555
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3552
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<pre style="margin: 0;"> <span id="LC3552" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Univ tyvars Eq-spec</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">@@ -3564,7 +3561,7 @@ rejigConRes tmpl_bndrs res_tmpl dc_tvbndrs res_ty</td>
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3564
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3561
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<pre style="margin: 0;"> <span id="LC3561" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- , [], [x,y,z]</span></span>
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3565
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3562
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<pre style="margin: 0;"> <span id="LC3562" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- , [a~(x,y),b~z], <arg-subst> )</span></span>
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3566
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3563
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<pre style="margin: 0;"> <span id="LC3563" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">subst</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcMatchTy</span> <span class="n" style="color: #333;">res_tmpl</span> <span class="n" style="color: #333;">res_ty</span></span>
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3567
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<pre style="margin: 0;">-<span id="LC3567" class="line" lang="haskell"> <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;">univ_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">raw_eqs</span><span class="p">,</span> <span class="n" style="color: #333;">kind_subst</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkGADTVars</span> <span class="n" style="color: #333;">t<span class="idiff left right">mpl</span>_tvs</span> <span class="n" style="color: #333;">dc_tvs</span> <span class="n" style="color: #333;">subst</span></span>
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<pre style="margin: 0;">+<span id="LC3564" class="line" lang="haskell"> <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;">univ_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">raw_eqs</span><span class="p">,</span> <span class="n" style="color: #333;">kind_subst</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkGADTVars</span> <span class="n" style="color: #333;">t<span class="idiff left right">c</span>_tvs</span> <span class="n" style="color: #333;">dc_tvs</span> <span class="n" style="color: #333;">subst</span></span>
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<pre style="margin: 0;"> <span id="LC3565" class="line" lang="haskell"> <span class="n" style="color: #333;">raw_ex_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dc_tvs</span> <span class="p">`</span><span class="n" style="color: #333;">minusList</span><span class="p">`</span> <span class="n" style="color: #333;">univ_tvs</span></span>
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3569
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3566
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<pre style="margin: 0;"> <span id="LC3566" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">arg_subst</span><span class="p">,</span> <span class="n" style="color: #333;">substed_ex_tvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substTyVarBndrs</span> <span class="n" style="color: #333;">kind_subst</span> <span class="n" style="color: #333;">raw_ex_tvs</span></span>
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3570
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3567
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<pre style="margin: 0;"> <span id="LC3567" 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">@@ -3591,10 +3588,10 @@ rejigConRes tmpl_bndrs res_tmpl dc_tvbndrs res_ty</td>
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3591
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3588
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<pre style="margin: 0;"> <span id="LC3588" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- albeit bogus, relying on checkValidDataCon to check the</span></span>
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3592
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3589
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<pre style="margin: 0;"> <span id="LC3589" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- bad-result-type error before seeing that the other fields look odd</span></span>
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3593
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3590
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<pre style="margin: 0;"> <span id="LC3590" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Checking GADT return types]</span></span>
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3594
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<pre style="margin: 0;">-<span id="LC3594" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">t<span class="idiff left">mpl_tvs</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">dc_tvs</span></span><span class="idiff"> </span><span class="p"><span class="idiff">`</span></span><span class="n" style="color: #333;"><span class="idiff">minusList</span></span><span class="p"><span class="idiff">`</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">tmpl</span>_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">dc_tvbndrs</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span> <span class="n" style="color: #333;">emptyTCvSubst</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC3591" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">t<span class="idiff left">c_tvs</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">dc_tvs</span></span><span class="idiff"> </span><span class="p"><span class="idiff">`</span></span><span class="n" style="color: #333;"><span class="idiff">minusList</span></span><span class="p"><span class="idiff">`</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">tc</span>_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">dc_tvbndrs</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span> <span class="n" style="color: #333;">emptyTCvSubst</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC3592" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC3596" class="line" lang="haskell"> <span class="n" style="color: #333;">dc_tvs</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">binderVars</span> <span class="n" style="color: #333;">dc_tvbndrs</span></span>
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<pre style="margin: 0;">-<span id="LC3597" class="line" lang="haskell"> <span class="n" style="color: #333;">t<span class="idiff left">mpl_tvs</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">binderVars</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">tmpl_</span>bndrs</span></span>
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<pre style="margin: 0;">+<span id="LC3593" class="line" lang="haskell"> <span class="n" style="color: #333;">dc_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">binderVars</span> <span class="n" style="color: #333;">dc_tvbndrs</span></span>
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<pre style="margin: 0;">+<span id="LC3594" class="line" lang="haskell"> <span class="n" style="color: #333;">t<span class="idiff left">c_tvs</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">binderVars</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">tc_tv</span>bndrs</span></span>
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<pre style="margin: 0;"> <span id="LC3595" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3596" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [mkGADTVars]</span></span>
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<pre style="margin: 0;"> <span id="LC3597" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6f6cd8b076e4703436a3b31e4eac4a87c7cb8e7f#e63425e031ffe9350ee6b1687e506aaea75d11e1"><strong>compiler/GHC/Tc/TyCl/Instance.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -688,9 +688,8 @@ tcDataFamInstDecl mb_clsinfo tv_skol_env</td>
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<pre style="margin: 0;"> <span id="LC688" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Do /not/ check that the number of patterns = tyConArity fam_tc</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;">-- See [Arity of data families] in GHC.Core.FamInstEnv</span></span>
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<pre style="margin: 0;"> <span id="LC690" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">qtvs</span><span class="p">,</span> <span class="n" style="color: #333;">pats</span><span class="p">,</span> <span class="n" style="color: #333;">res_kind</span><span class="p">,</span> <span class="n" style="color: #333;">stupid_theta</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC691" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcDataFamInstHeader</span> <span class="n" style="color: #333;">mb_clsinfo</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">outer_bndrs</span></span>
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<pre style="margin: 0;">-<span id="LC692" class="line" lang="haskell"> <span class="n" style="color: #333;">fixity</span> <span class="n" style="color: #333;">hs_ctxt</span> <span class="n" style="color: #333;">hs_pats</span> <span class="n" style="color: #333;">m_ksig</span> <span class="n" style="color: #333;">hs_cons</span></span>
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<pre style="margin: 0;">-<span id="LC693" class="line" lang="haskell"> <span class="n" style="color: #333;">new_or_data</span></span>
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<pre style="margin: 0;">+<span id="LC691" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcDataFamInstHeader</span> <span class="n" style="color: #333;">mb_clsinfo</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">outer_bndrs</span> <span class="n" style="color: #333;">fixity</span></span>
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<pre style="margin: 0;">+<span id="LC692" class="line" lang="haskell"> <span class="n" style="color: #333;">hs_ctxt</span> <span class="n" style="color: #333;">hs_pats</span> <span class="n" style="color: #333;">m_ksig</span> <span class="n" style="color: #333;">new_or_data</span></span>
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<pre style="margin: 0;"> <span id="LC693" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC694" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Eta-reduce the axiom if possible</span></span>
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<pre style="margin: 0;"> <span id="LC695" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Quite tricky: see Note [Implementing eta reduction for data families]</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">@@ -857,7 +856,7 @@ TyVarEnv will simply be empty, and there is nothing to worry about.</td>
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857
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856
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<pre style="margin: 0;"> <span id="LC856" class="line" lang="haskell"><span class="n" style="color: #333;">tcDataFamInstHeader</span></span>
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858
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<pre style="margin: 0;"> <span id="LC857" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">AssocInstInfo</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsOuterFamEqnTyVarBndrs</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span></span>
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858
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<pre style="margin: 0;"> <span id="LC858" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LexicalFixity</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsContext</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span></span>
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860
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<pre style="margin: 0;">-<span id="LC860" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsTyPats</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</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;">LHsKind</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">)</span><span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">LConDecl</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">GhcRn</span></span><span class="p"><span class="idiff right">]</span></span></span>
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<pre style="margin: 0;">+<span id="LC859" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsTyPats</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</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;">LHsKind</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">)</span></span>
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861
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860
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<pre style="margin: 0;"> <span id="LC860" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">NewOrData</span></span>
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862
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861
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<pre style="margin: 0;"> <span id="LC861" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">],</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">Kind</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ThetaType</span><span class="p">)</span></span>
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863
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862
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<pre style="margin: 0;"> <span id="LC862" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The "header" of a data family instance is the part other than</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="864" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -865,7 +864,7 @@ tcDataFamInstHeader</td>
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865
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864
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<pre style="margin: 0;"> <span id="LC864" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- e.g. data instance D [a] :: * -> * where ...</span></span>
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866
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865
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<pre style="margin: 0;"> <span id="LC865" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Here the "header" is the bit before the "where"</span></span>
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867
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866
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<pre style="margin: 0;"> <span id="LC866" class="line" lang="haskell"><span class="n" style="color: #333;">tcDataFamInstHeader</span> <span class="n" style="color: #333;">mb_clsinfo</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">outer_bndrs</span> <span class="n" style="color: #333;">fixity</span></span>
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868
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<pre style="margin: 0;">-<span id="LC868" class="line" lang="haskell"> <span class="n" style="color: #333;">hs_ctxt</span> <span class="n" style="color: #333;">hs_pats</span> <span class="n" style="color: #333;">m_ksig</span> <span class="n" style="color: #333;"><span class="idiff left">hs_cons</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">new_or_data</span></span>
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<pre style="margin: 0;">+<span id="LC867" class="line" lang="haskell"> <span class="n" style="color: #333;">hs_ctxt</span> <span class="n" style="color: #333;">hs_pats</span> <span class="n" style="color: #333;">m_ksig</span> <span class="n" style="color: #333;">new_or_data</span></span>
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869
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868
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<pre style="margin: 0;"> <span id="LC868" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tcDataFamInstHeader {"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fam_tc</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">hs_pats</span><span class="p">)</span></span>
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870
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869
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<pre style="margin: 0;"> <span id="LC869" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">tclvl</span><span class="p">,</span> <span class="n" style="color: #333;">wanted</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">scoped_tvs</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">stupid_theta</span><span class="p">,</span> <span class="n" style="color: #333;">lhs_ty</span><span class="p">,</span> <span class="n" style="color: #333;">master_res_kind</span><span class="p">,</span> <span class="n" style="color: #333;">instance_res_kind</span><span class="p">)))</span></span>
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870
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<pre style="margin: 0;"> <span id="LC870" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pushLevelAndSolveEqualitiesX</span> <span class="s" style="color: #d14;">"tcDataFamInstHeader"</span> <span class="o" style="font-weight: 600;">$</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -884,8 +883,8 @@ tcDataFamInstHeader mb_clsinfo fam_tc outer_bndrs fixity</td>
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884
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883
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<pre style="margin: 0;"> <span id="LC883" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Add constraints from the result signature</span></span>
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<pre style="margin: 0;"> <span id="LC884" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">res_kind</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tc_kind_sig</span> <span class="n" style="color: #333;">m_ksig</span></span>
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<pre style="margin: 0;"> <span id="LC885" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC887" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">A</span>dd constraints from the data constructors</span></span>
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<pre style="margin: 0;">-<span id="LC888" class="line" lang="haskell"> <span class="p"><span class="idiff left">;</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">kcConDecls</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">new_or_data</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">res_kind</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">hs_cons</span></span></span>
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<pre style="margin: 0;">+<span id="LC886" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">Do not a</span>dd constraints from the data constructors</span></span>
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<pre style="margin: 0;">+<span id="LC887" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">-- See Note [Kind inference for data family instances]</span></span></span>
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<pre style="margin: 0;"> <span id="LC888" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC889" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Check that the result kind of the TyCon applied to its args</span></span>
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<pre style="margin: 0;"> <span id="LC890" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- is compatible with the explicit signature (or Type, if there</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">@@ -1049,6 +1048,81 @@ however, so this Note aims to describe these subtleties:</td>
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<pre style="margin: 0;"> <span id="LC1048" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> themselves. Heavy sigh. But not truly hard; that's what tcbVisibilities</span></span>
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1049
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<pre style="margin: 0;"> <span id="LC1049" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> does.</span></span>
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<pre style="margin: 0;"> <span id="LC1050" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1051" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Kind inference for data family instances]</span></span>
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<pre style="margin: 0;">+<span id="LC1052" 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="LC1053" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider this GADT-style data type declaration, where I have used</span></span>
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<pre style="margin: 0;">+<span id="LC1054" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">fresh variables in the data constructor's type, to stress that c,d are</span></span>
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<pre style="margin: 0;">+<span id="LC1055" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">quite distinct from a,b.</span></span>
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<pre style="margin: 0;">+<span id="LC1056" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T a b where</span></span>
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<pre style="margin: 0;">+<span id="LC1057" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkT :: forall c d. c d -> T c d</span></span>
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<pre style="margin: 0;">+<span id="LC1058" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1059" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Following Note [Inferring kinds for type declarations] in GHC.Tc.TyCl,</span></span>
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<pre style="margin: 0;">+<span id="LC1060" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to infer T's kind, we initially give T :: kappa, a monomorpic kind,</span></span>
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1061
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<pre style="margin: 0;">+<span id="LC1061" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">gather constraints from the header and data constructors, and conclude</span></span>
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<pre style="margin: 0;">+<span id="LC1062" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> T :: (kappa1 -> type) -> kappa1 -> Type</span></span>
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<pre style="margin: 0;">+<span id="LC1063" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Then we generalise, giving</span></span>
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<pre style="margin: 0;">+<span id="LC1064" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> T :: forall k. (k->Type) -> k -> Type</span></span>
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1065
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<pre style="margin: 0;">+<span id="LC1065" class="line" lang="haskell"></span>
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<td class="diff-line-num new new_line" data-linenumber="1066" 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">
1066
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<pre style="margin: 0;">+<span id="LC1066" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Now what about a data /instance/ decl</span></span>
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1067
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<pre style="margin: 0;">+<span id="LC1067" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data family T :: forall k. (k->Type) -> k -> Type</span></span>
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1068
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<pre style="margin: 0;">+<span id="LC1068" class="line" lang="haskell"></span>
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1069
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<pre style="margin: 0;">+<span id="LC1069" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data instance T p Int where ...</span></span>
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1070
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<pre style="margin: 0;">+<span id="LC1070" class="line" lang="haskell"></span>
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<td class="diff-line-num new new_line" data-linenumber="1071" 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">
1071
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<pre style="margin: 0;">+<span id="LC1071" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">No doubt here! The poly-kinded T is instantiated with k=Type, so the</span></span>
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1072
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<pre style="margin: 0;">+<span id="LC1072" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">header really looks like</span></span>
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1073
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<pre style="margin: 0;">+<span id="LC1073" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data instance T @Type (p :: Type->Type) Int where ...</span></span>
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1074
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<pre style="margin: 0;">+<span id="LC1074" class="line" lang="haskell"></span>
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1075
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<pre style="margin: 0;">+<span id="LC1075" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But what about this?</span></span>
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1076
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<pre style="margin: 0;">+<span id="LC1076" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data instance T p q where</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1077" 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">
1077
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<pre style="margin: 0;">+<span id="LC1077" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkT :: forall r. r Int -> T r Int</span></span>
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1078
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<pre style="margin: 0;">+<span id="LC1078" class="line" lang="haskell"></span>
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1079
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<pre style="margin: 0;">+<span id="LC1079" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So what kind do 'p' and 'q' have? No clues from the header, but from</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1080" 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">
1080
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<pre style="margin: 0;">+<span id="LC1080" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the data constructor we can clearly see that (r :: Type->Type). Does</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1081" 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">
1081
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<pre style="margin: 0;">+<span id="LC1081" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that mean that the the /entire data instance/ is instantiated at Type,</span></span>
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1082
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<pre style="margin: 0;">+<span id="LC1082" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">like this?</span></span>
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1083
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<pre style="margin: 0;">+<span id="LC1083" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data instance T @Type (p :: Type->Type) (q :: Type) where</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1084" 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">
1084
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<pre style="margin: 0;">+<span id="LC1084" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ...</span></span>
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1085
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<pre style="margin: 0;">+<span id="LC1085" class="line" lang="haskell"></span>
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<td class="diff-line-num new new_line" data-linenumber="1086" 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">
1086
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<pre style="margin: 0;">+<span id="LC1086" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Not at all! This is a /GADT/-style decl, so the kind argument might</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1087" 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">
1087
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<pre style="margin: 0;">+<span id="LC1087" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">be specialised in this particular data constructor, thus:</span></span>
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1088
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<pre style="margin: 0;">+<span id="LC1088" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data instance T @k (p :: k->Type) (q :: k) where</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1089" 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">
1089
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<pre style="margin: 0;">+<span id="LC1089" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkT :: forall (r :: Type -> Type).</span></span>
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1090
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<pre style="margin: 0;">+<span id="LC1090" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> r Int -> T @Type r Int</span></span>
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1091
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<pre style="margin: 0;">+<span id="LC1091" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(and perhaps specialised differently in some other data</span></span>
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1092
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<pre style="margin: 0;">+<span id="LC1092" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">constructor MkT2).</span></span>
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1093
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<pre style="margin: 0;">+<span id="LC1093" class="line" lang="haskell"></span>
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1094
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<pre style="margin: 0;">+<span id="LC1094" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The key difference in this case and 'data T' at the top of this Note</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1095" 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">
1095
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<pre style="margin: 0;">+<span id="LC1095" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is that we have no known kind for 'data T'. We thus forbid different</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1096" 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">
1096
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<pre style="margin: 0;">+<span id="LC1096" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">specialisations of T in its constructors, in an attempt to avoid</span></span>
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1097
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<pre style="margin: 0;">+<span id="LC1097" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">inferring polymorphic recursion. In data family T, however, there is</span></span>
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1098
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<pre style="margin: 0;">+<span id="LC1098" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">no problem with polymorphic recursion: we already /fully know/ T's</span></span>
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1099
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<pre style="margin: 0;">+<span id="LC1099" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">kind -- that came from the family declaration, and is not influenced</span></span>
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1100
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<pre style="margin: 0;">+<span id="LC1100" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">by the data instances -- and hence we /can/ specialise T's kind</span></span>
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1101
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<pre style="margin: 0;">+<span id="LC1101" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">differently in different GADT data constructors.</span></span>
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1102
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<pre style="margin: 0;">+<span id="LC1102" class="line" lang="haskell"></span>
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1103
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<pre style="margin: 0;">+<span id="LC1103" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">SHORT SUMMARY: in a data instance decl, it's not clear whether kind</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1104" 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">
1104
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<pre style="margin: 0;">+<span id="LC1104" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">constraints arising from the data constructors should be considered</span></span>
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1105
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<pre style="margin: 0;">+<span id="LC1105" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">local to the (GADT) data /constructor/ or should apply to the entire</span></span>
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1106
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<pre style="margin: 0;">+<span id="LC1106" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">data instance.</span></span>
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1107
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<pre style="margin: 0;">+<span id="LC1107" class="line" lang="haskell"></span>
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1108
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<pre style="margin: 0;">+<span id="LC1108" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">DESIGN CHOICE: in data/newtype family instance declarations, we ignore</span></span>
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1109
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<pre style="margin: 0;">+<span id="LC1109" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the /data constructor/ declarations altogether, looking only at the</span></span>
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1110
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<pre style="margin: 0;">+<span id="LC1110" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">data instance /header/.</span></span>
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1111
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<pre style="margin: 0;">+<span id="LC1111" class="line" lang="haskell"></span>
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1112
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<pre style="margin: 0;">+<span id="LC1112" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Observations:</span></span>
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1113
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<pre style="margin: 0;">+<span id="LC1113" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* This choice is simple to describe, as well as simple to implment.</span></span>
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1114
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<pre style="margin: 0;">+<span id="LC1114" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> For a data/newtype instance decl, the instance kinds are influenced</span></span>
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1115
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<pre style="margin: 0;">+<span id="LC1115" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> /only/ by the header.</span></span>
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1116
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<pre style="margin: 0;">+<span id="LC1116" class="line" lang="haskell"></span>
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1117
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<pre style="margin: 0;">+<span id="LC1117" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* We could treat Haskell-98 style data-instance decls differently, by</span></span>
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1118
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<pre style="margin: 0;">+<span id="LC1118" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> taking the data constructors into account, since there are no GADT</span></span>
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1119
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<pre style="margin: 0;">+<span id="LC1119" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> issues.</span></span>
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1120
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<pre style="margin: 0;">+<span id="LC1120" class="line" lang="haskell"></span>
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1121
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<pre style="margin: 0;">+<span id="LC1121" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Ditto newtypes, since again you can't have newtype GADTs.</span></span>
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1122
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<pre style="margin: 0;">+<span id="LC1122" class="line" lang="haskell"></span>
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1123
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<pre style="margin: 0;">+<span id="LC1123" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But for now at least, we keep the simplest choice. See #18891 and !4419</span></span>
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1124
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<pre style="margin: 0;">+<span id="LC1124" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">for more discussion of this issue.a</span></span>
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1125
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<pre style="margin: 0;">+<span id="LC1125" class="line" lang="haskell"></span>
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1052
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1126
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<pre style="margin: 0;"> <span id="LC1126" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1053
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1127
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<pre style="margin: 0;"> <span id="LC1127" class="line" lang="haskell"></span>
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1054
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1128
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<pre style="margin: 0;"> <span id="LC1128" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6f6cd8b076e4703436a3b31e4eac4a87c7cb8e7f#fa050e1532c92b2ffc94692d8b368f3fefa3196d"><strong>docs/users_guide/exts/poly_kinds.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">@@ -130,8 +130,45 @@ This rule has occasionally-surprising consequences (see</td>
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<pre style="margin: 0;"> <span id="LC130" class="line" lang="plaintext">The kind-polymorphism from the class declaration makes ``D1``</span>
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<pre style="margin: 0;"> <span id="LC131" class="line" lang="plaintext">kind-polymorphic, but not so ``D2``; and similarly ``F1``, ``F2``.</span>
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<pre style="margin: 0;"> <span id="LC132" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC133" class="line" lang="plaintext">Kind inference in type signatures</span>
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134
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<pre style="margin: 0;">+<span id="LC134" class="line" lang="plaintext">---------------------------------</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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<pre style="margin: 0;">+<span id="LC136" class="line" lang="plaintext">When kind-checking a type, GHC considers only what is written in that</span>
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<pre style="margin: 0;">+<span id="LC137" class="line" lang="plaintext">type when figuring out how to generalise the type's kind.</span>
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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">For example,</span>
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140
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<pre style="margin: 0;">+<span id="LC140" class="line" lang="plaintext">consider these definitions (with :extension:`ScopedTypeVariables`): ::</span>
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141
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<pre style="margin: 0;">+<span id="LC141" class="line" lang="plaintext"></span>
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142
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<pre style="margin: 0;">+<span id="LC142" class="line" lang="plaintext"> data Proxy a -- Proxy :: forall k. k -> Type</span>
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143
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<pre style="margin: 0;">+<span id="LC143" class="line" lang="plaintext"> p :: forall a. Proxy a</span>
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144
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<pre style="margin: 0;">+<span id="LC144" class="line" lang="plaintext"> p = Proxy :: Proxy (a :: Type)</span>
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145
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<pre style="margin: 0;">+<span id="LC145" class="line" lang="plaintext"></span>
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146
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<pre style="margin: 0;">+<span id="LC146" class="line" lang="plaintext">GHC reports an error, saying that the kind of ``a`` should be a kind variable</span>
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147
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<pre style="margin: 0;">+<span id="LC147" class="line" lang="plaintext">``k``, not ``Type``. This is because, by looking at the type signature</span>
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148
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<pre style="margin: 0;">+<span id="LC148" class="line" lang="plaintext">``forall a. Proxy a``, GHC assumes ``a``'s kind should be generalised, not</span>
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149
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<pre style="margin: 0;">+<span id="LC149" class="line" lang="plaintext">restricted to be ``Type``. The function definition is then rejected for being</span>
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150
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<pre style="margin: 0;">+<span id="LC150" class="line" lang="plaintext">more specific than its type signature.</span>
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<pre style="margin: 0;">+<span id="LC151" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC152" class="line" lang="plaintext">.. _explicit-kind-quantification:</span>
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153
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<pre style="margin: 0;">+<span id="LC153" class="line" lang="plaintext"></span>
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154
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<pre style="margin: 0;">+<span id="LC154" class="line" lang="plaintext">Explicit kind quantification</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"></span>
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157
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<pre style="margin: 0;">+<span id="LC157" class="line" lang="plaintext">Enabled by :extension:`PolyKinds`, GHC supports explicit kind quantification,</span>
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158
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<pre style="margin: 0;">+<span id="LC158" class="line" lang="plaintext">as in these examples: ::</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"> data Proxy :: forall k. k -> Type</span>
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161
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<pre style="margin: 0;">+<span id="LC161" class="line" lang="plaintext"> f :: (forall k (a :: k). Proxy a -> ()) -> Int</span>
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162
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<pre style="margin: 0;">+<span id="LC162" class="line" lang="plaintext"></span>
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163
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<pre style="margin: 0;">+<span id="LC163" class="line" lang="plaintext">Note that the second example has a ``forall`` that binds both a kind ``k`` and</span>
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164
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<pre style="margin: 0;">+<span id="LC164" class="line" lang="plaintext">a type variable ``a`` of kind ``k``. In general, there is no limit to how</span>
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<pre style="margin: 0;">+<span id="LC165" class="line" lang="plaintext">deeply nested this sort of dependency can work. However, the dependency must</span>
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<pre style="margin: 0;">+<span id="LC166" class="line" lang="plaintext">be well-scoped: ``forall (a :: k) k. ...`` is an error.</span>
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<pre style="margin: 0;"> <span id="LC169" class="line" lang="plaintext">.. _inferring-variable-order:</span>
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<pre style="margin: 0;"> <span id="LC170" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC172" class="line" lang="plaintext">Inferring the order of variables in a type/class declaration</span>
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<pre style="margin: 0;"> <span id="LC173" class="line" lang="plaintext">------------------------------------------------------------</span>
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<pre style="margin: 0;"> <span id="LC174" class="line" lang="plaintext"></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">@@ -490,41 +527,74 @@ This also applies to GADT-style data instances: ::</td>
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<pre style="margin: 0;"> <span id="LC527" class="line" lang="plaintext"> -- • In the data instance declaration for ‘T’</span>
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<pre style="margin: 0;"> <span id="LC528" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC529" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC493" class="line" lang="plaintext">Kind inference in <span class="idiff left right">closed type familie</span>s</span>
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494
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<pre style="margin: 0;">-<span id="LC494" class="line" lang="plaintext">--------------------------------------</span>
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<pre style="margin: 0;">+<span id="LC530" class="line" lang="plaintext">Kind inference in <span class="idiff left right">data type declaration</span>s</span>
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<pre style="margin: 0;">+<span id="LC531" class="line" lang="plaintext">--------------------------------------<span class="idiff left right">--</span></span>
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<pre style="margin: 0;"> <span id="LC532" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC496" class="line" lang="plaintext">Although all open type families are considered to have a complete</span>
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<pre style="margin: 0;">-<span id="LC497" class="line" lang="plaintext">user-supplied kind signature, we can relax this condition for closed</span>
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<pre style="margin: 0;">-<span id="LC498" class="line" lang="plaintext">type families, where we have equations on which to perform kind</span>
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<pre style="margin: 0;">-<span id="LC499" class="line" lang="plaintext">inference. GHC will infer kinds for the arguments and result types of a</span>
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<pre style="margin: 0;">-<span id="LC500" class="line" lang="plaintext">closed type family.</span>
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<pre style="margin: 0;">+<span id="LC533" class="line" lang="plaintext">Consider the declaration ::</span>
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<pre style="margin: 0;">-<span id="LC502" class="line" lang="plaintext">GHC supports *kind-indexed* type families, where the family matches both</span>
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503
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<pre style="margin: 0;">-<span id="LC503" class="line" lang="plaintext">on the kind and type. GHC will *not* infer this behaviour without a</span>
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<pre style="margin: 0;">-<span id="LC504" class="line" lang="plaintext">complete user-supplied kind signature, as doing so would sometimes infer</span>
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<pre style="margin: 0;">-<span id="LC505" class="line" lang="plaintext">non-principal types. Indeed, we can see kind-indexing as a form</span>
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<pre style="margin: 0;">-<span id="LC506" class="line" lang="plaintext">of polymorphic recursion, where a type is used at a kind other than</span>
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<pre style="margin: 0;">-<span id="LC507" class="line" lang="plaintext">its most general in its own definition.</span>
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<pre style="margin: 0;">+<span id="LC535" class="line" lang="plaintext"> data T1 f a = MkT1 (f a)</span>
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<pre style="margin: 0;">+<span id="LC536" class="line" lang="plaintext"> data T2 f a where</span>
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<pre style="margin: 0;">+<span id="LC537" class="line" lang="plaintext"> MkT2 :: f a -> T f a</span>
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<pre style="margin: 0;"> <span id="LC538" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC509" class="line" lang="plaintext">For example: ::</span>
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<pre style="margin: 0;">+<span id="LC539" class="line" lang="plaintext">In both cases GHC looks at the data constructor declarations to</span>
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<pre style="margin: 0;">+<span id="LC540" class="line" lang="plaintext">give constraints on the kind of ``T``, yielding ::</span>
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<pre style="margin: 0;"> <span id="LC541" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC511" class="line" lang="plaintext"> type family F1 a where</span>
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<pre style="margin: 0;">-<span id="LC512" class="line" lang="plaintext"> F1 True = False</span>
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<pre style="margin: 0;">-<span id="LC513" class="line" lang="plaintext"> F1 False = True</span>
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<pre style="margin: 0;">-<span id="LC514" class="line" lang="plaintext"> F1 x = x</span>
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<pre style="margin: 0;">-<span id="LC515" class="line" lang="plaintext"> -- F1 fails to compile: kind-indexing is not inferred</span>
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<pre style="margin: 0;">+<span id="LC542" class="line" lang="plaintext"> T1, T2 :: forall k. (k -> Type) -> k -> Typ</span>
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<pre style="margin: 0;"> <span id="LC543" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC517" class="line" lang="plaintext"> type family F2 (a :: k) where</span>
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<pre style="margin: 0;">-<span id="LC518" class="line" lang="plaintext"> F2 True = False</span>
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<pre style="margin: 0;">-<span id="LC519" class="line" lang="plaintext"> F2 False = True</span>
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<pre style="margin: 0;">-<span id="LC520" class="line" lang="plaintext"> F2 x = x</span>
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<pre style="margin: 0;">-<span id="LC521" class="line" lang="plaintext"> -- F2 fails to compile: no complete signature</span>
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<pre style="margin: 0;">+<span id="LC544" class="line" lang="plaintext">Consider the type ::</span>
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545
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<pre style="margin: 0;">+<span id="LC545" class="line" lang="plaintext"></span>
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546
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<pre style="margin: 0;">+<span id="LC546" class="line" lang="plaintext"> data G (a :: k) where</span>
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547
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<pre style="margin: 0;">+<span id="LC547" class="line" lang="plaintext"> GInt :: G Int</span>
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548
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<pre style="margin: 0;">+<span id="LC548" class="line" lang="plaintext"> GMaybe :: G Maybe</span>
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549
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<pre style="margin: 0;">+<span id="LC549" class="line" lang="plaintext"></span>
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550
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<pre style="margin: 0;">+<span id="LC550" class="line" lang="plaintext">This datatype ``G`` is GADT-like in both its kind and its type. Suppose you</span>
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551
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<pre style="margin: 0;">+<span id="LC551" class="line" lang="plaintext">have ``g :: G a``, where ``a :: k``. Then pattern matching to discover that</span>
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552
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<pre style="margin: 0;">+<span id="LC552" class="line" lang="plaintext">``g`` is in fact ``GMaybe`` tells you both that ``k ~ (Type -> Type)`` and</span>
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553
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<pre style="margin: 0;">+<span id="LC553" class="line" lang="plaintext">``a ~ Maybe``. The definition for ``G`` requires that :extension:`PolyKinds`</span>
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554
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<pre style="margin: 0;">+<span id="LC554" class="line" lang="plaintext">be in effect, but pattern-matching on ``G`` requires no extension beyond</span>
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<pre style="margin: 0;">+<span id="LC555" class="line" lang="plaintext">:extension:`GADTs`. That this works is actually a straightforward extension</span>
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<pre style="margin: 0;">+<span id="LC556" class="line" lang="plaintext">of regular GADTs and a consequence of the fact that kinds and types are the</span>
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557
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<pre style="margin: 0;">+<span id="LC557" class="line" lang="plaintext">same.</span>
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558
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<pre style="margin: 0;">+<span id="LC558" class="line" lang="plaintext"></span>
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559
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<pre style="margin: 0;">+<span id="LC559" class="line" lang="plaintext">Note that the datatype ``G`` is used at different kinds in its body, and</span>
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560
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<pre style="margin: 0;">+<span id="LC560" class="line" lang="plaintext">therefore that kind-indexed GADTs use a form of polymorphic recursion.</span>
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561
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<pre style="margin: 0;">+<span id="LC561" class="line" lang="plaintext">It is thus only possible to use this feature if you have provided a</span>
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562
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<pre style="margin: 0;">+<span id="LC562" class="line" lang="plaintext">complete user-supplied kind signature</span>
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563
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<pre style="margin: 0;">+<span id="LC563" class="line" lang="plaintext">for the datatype (:ref:`complete-kind-signatures`), or a standalone</span>
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564
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<pre style="margin: 0;">+<span id="LC564" class="line" lang="plaintext">kind signature (:ref:`standalone-kind-signatures`);</span>
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565
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<pre style="margin: 0;">+<span id="LC565" class="line" lang="plaintext">in the case of ``G`` we have a CUSK.</span>
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566
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<pre style="margin: 0;">+<span id="LC566" class="line" lang="plaintext">A more explicit declaration that fills in the invisible kind arguments would be ::</span>
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567
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<pre style="margin: 0;">+<span id="LC567" class="line" lang="plaintext"></span>
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568
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<pre style="margin: 0;">+<span id="LC568" class="line" lang="plaintext"> data G @k (a :: k) where</span>
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569
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<pre style="margin: 0;">+<span id="LC569" class="line" lang="plaintext"> GInt :: G @Type Int</span>
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570
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<pre style="margin: 0;">+<span id="LC570" class="line" lang="plaintext"> GMaybe :: G @(Type->Type) Maybe</span>
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571
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<pre style="margin: 0;">+<span id="LC571" class="line" lang="plaintext"></span>
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572
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<pre style="margin: 0;">+<span id="LC572" class="line" lang="plaintext">where you can see the GADT-like nature of the two constructors.</span>
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573
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<pre style="margin: 0;">+<span id="LC573" class="line" lang="plaintext"></span>
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574
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<pre style="margin: 0;">+<span id="LC574" class="line" lang="plaintext">Kind inference for data/newtype instance declarations</span>
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575
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<pre style="margin: 0;">+<span id="LC575" class="line" lang="plaintext">-----------------------------------------------------</span>
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576
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<pre style="margin: 0;">+<span id="LC576" class="line" lang="plaintext"></span>
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577
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<pre style="margin: 0;">+<span id="LC577" class="line" lang="plaintext">Consider these declarations ::</span>
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578
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<pre style="margin: 0;">+<span id="LC578" class="line" lang="plaintext"></span>
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579
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<pre style="margin: 0;">+<span id="LC579" class="line" lang="plaintext"> data family T :: forall k. (k->Type) -> k -> Type</span>
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580
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<pre style="margin: 0;">+<span id="LC580" class="line" lang="plaintext"></span>
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581
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<pre style="margin: 0;">+<span id="LC581" class="line" lang="plaintext"> data instance T p q where</span>
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582
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<pre style="margin: 0;">+<span id="LC582" class="line" lang="plaintext"> MkT :: forall r. r Int -> T r Int</span>
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583
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<pre style="margin: 0;">+<span id="LC583" class="line" lang="plaintext"></span>
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584
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<pre style="margin: 0;">+<span id="LC584" class="line" lang="plaintext">Here ``T`` has an invisible kind argument; and perhaps it is instantiated</span>
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585
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<pre style="margin: 0;">+<span id="LC585" class="line" lang="plaintext">to ``(Type->Type)`` in the instance, thus ::</span>
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586
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<pre style="margin: 0;">+<span id="LC586" class="line" lang="plaintext"></span>
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587
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<pre style="margin: 0;">+<span id="LC587" class="line" lang="plaintext"> data instance T @(Type->Type) p q where</span>
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588
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<pre style="margin: 0;">+<span id="LC588" class="line" lang="plaintext"> MkT :: forall r. r Int -> T r Int</span>
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589
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<pre style="margin: 0;">+<span id="LC589" class="line" lang="plaintext"></span>
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590
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<pre style="margin: 0;">+<span id="LC590" class="line" lang="plaintext">This latter form is accepted, but the former is not: in data/newtype</span>
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591
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<pre style="margin: 0;">+<span id="LC591" class="line" lang="plaintext">instance declararations (unlike ordinary data/newtype declarations)</span>
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592
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<pre style="margin: 0;">+<span id="LC592" class="line" lang="plaintext">we do *not* look at the constructor declarations. The principle is</span>
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593
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<pre style="margin: 0;">+<span id="LC593" class="line" lang="plaintext">that *the instantiation of the data instance should be apparent from the header alone*.</span>
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594
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<pre style="margin: 0;">+<span id="LC594" class="line" lang="plaintext">This principle makes the program easier to understand; but it also</span>
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595
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<pre style="margin: 0;">+<span id="LC595" class="line" lang="plaintext">avoids a swamp of complexity about which type specialisation comes from the</span>
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<pre style="margin: 0;">+<span id="LC596" class="line" lang="plaintext">data instance, and which from the individual GADT data constructors.</span>
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<pre style="margin: 0;"> <span id="LC597" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC523" class="line" lang="plaintext"> type family F3 (a :: k) :: k where</span>
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<pre style="margin: 0;">-<span id="LC524" class="line" lang="plaintext"> F3 True = False</span>
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<pre style="margin: 0;">-<span id="LC525" class="line" lang="plaintext"> F3 False = True</span>
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<pre style="margin: 0;">-<span id="LC526" class="line" lang="plaintext"> F3 x = x</span>
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<pre style="margin: 0;">-<span id="LC527" class="line" lang="plaintext"> -- OK</span>
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<pre style="margin: 0;"> <span id="LC598" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC599" class="line" lang="plaintext">Kind inference in class instance declarations</span>
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<pre style="margin: 0;"> <span id="LC600" class="line" lang="plaintext">---------------------------------------------</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">@@ -555,43 +625,8 @@ infrastructure, and it's not clear the payoff is worth it. If you want</td>
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<pre style="margin: 0;"> <span id="LC625" class="line" lang="plaintext">to restrict ``b``\ 's kind in the instance above, just use a kind</span>
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<pre style="margin: 0;"> <span id="LC626" class="line" lang="plaintext">signature in the instance head.</span>
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<pre style="margin: 0;"> <span id="LC627" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC558" class="line" lang="plaintext">Kind inference in type signatures</span>
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<pre style="margin: 0;">-<span id="LC559" class="line" lang="plaintext">---------------------------------</span>
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<pre style="margin: 0;">-<span id="LC560" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC561" class="line" lang="plaintext">When kind-checking a type, GHC considers only what is written in that</span>
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<pre style="margin: 0;">-<span id="LC562" class="line" lang="plaintext">type when figuring out how to generalise the type's kind.</span>
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<pre style="margin: 0;">-<span id="LC563" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC564" class="line" lang="plaintext">For example,</span>
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<pre style="margin: 0;">-<span id="LC565" class="line" lang="plaintext">consider these definitions (with :extension:`ScopedTypeVariables`): ::</span>
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<pre style="margin: 0;">-<span id="LC566" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC567" class="line" lang="plaintext"> data Proxy a -- Proxy :: forall k. k -> Type</span>
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<pre style="margin: 0;">-<span id="LC568" class="line" lang="plaintext"> p :: forall a. Proxy a</span>
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<pre style="margin: 0;">-<span id="LC569" class="line" lang="plaintext"> p = Proxy :: Proxy (a :: Type)</span>
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<pre style="margin: 0;">-<span id="LC570" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC571" class="line" lang="plaintext">GHC reports an error, saying that the kind of ``a`` should be a kind variable</span>
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<pre style="margin: 0;">-<span id="LC572" class="line" lang="plaintext">``k``, not ``Type``. This is because, by looking at the type signature</span>
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<pre style="margin: 0;">-<span id="LC573" class="line" lang="plaintext">``forall a. Proxy a``, GHC assumes ``a``'s kind should be generalised, not</span>
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<pre style="margin: 0;">-<span id="LC574" class="line" lang="plaintext">restricted to be ``Type``. The function definition is then rejected for being</span>
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<pre style="margin: 0;">-<span id="LC575" class="line" lang="plaintext">more specific than its type signature.</span>
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<pre style="margin: 0;">-<span id="LC576" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC577" class="line" lang="plaintext">.. _explicit-kind-quantification:</span>
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<pre style="margin: 0;">-<span id="LC578" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC579" class="line" lang="plaintext">Explicit kind quantification</span>
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<pre style="margin: 0;">-<span id="LC580" class="line" lang="plaintext">----------------------------</span>
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<pre style="margin: 0;">-<span id="LC581" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC582" class="line" lang="plaintext">Enabled by :extension:`PolyKinds`, GHC supports explicit kind quantification,</span>
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<pre style="margin: 0;">-<span id="LC583" class="line" lang="plaintext">as in these examples: ::</span>
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<pre style="margin: 0;">-<span id="LC584" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC585" class="line" lang="plaintext"> data Proxy :: forall k. k -> Type</span>
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<pre style="margin: 0;">-<span id="LC586" class="line" lang="plaintext"> f :: (forall k (a :: k). Proxy a -> ()) -> Int</span>
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<pre style="margin: 0;">-<span id="LC587" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC588" class="line" lang="plaintext">Note that the second example has a ``forall`` that binds both a kind ``k`` and</span>
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<pre style="margin: 0;">-<span id="LC589" class="line" lang="plaintext">a type variable ``a`` of kind ``k``. In general, there is no limit to how</span>
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<pre style="margin: 0;">-<span id="LC590" class="line" lang="plaintext">deeply nested this sort of dependency can work. However, the dependency must</span>
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<pre style="margin: 0;">-<span id="LC591" class="line" lang="plaintext">be well-scoped: ``forall (a :: k) k. ...`` is an error.</span>
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<pre style="margin: 0;">-<span id="LC592" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC593" class="line" lang="plaintext">Implicit quantification in type synonyms and type family instances</span>
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<pre style="margin: 0;">-<span id="LC594" class="line" lang="plaintext">------------------------------------------------------------------</span>
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<pre style="margin: 0;">+<span id="LC628" class="line" lang="plaintext">Kind inference in type synonyms and type family instances</span>
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<pre style="margin: 0;">+<span id="LC629" class="line" lang="plaintext">---------------------------------------------------------</span>
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<pre style="margin: 0;"> <span id="LC630" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC631" class="line" lang="plaintext">Consider the scoping rules for type synonyms and type family instances, such as</span>
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632
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<pre style="margin: 0;"> <span id="LC632" class="line" lang="plaintext">these::</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">@@ -706,29 +741,41 @@ kinds. Consequently, visible dependent quantifiers are rejected in any context</td>
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<pre style="margin: 0;"> <span id="LC741" class="line" lang="plaintext">that is unambiguously the type of a term. They are also rejected in the types</span>
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742
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<pre style="margin: 0;"> <span id="LC742" class="line" lang="plaintext">of data constructors.</span>
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<pre style="margin: 0;"> <span id="LC743" class="line" lang="plaintext"></span>
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709
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<pre style="margin: 0;">-<span id="LC709" class="line" lang="plaintext">Kind<span class="idiff left right">-indexed GADT</span>s</span>
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<pre style="margin: 0;">-<span id="LC710" class="line" lang="plaintext">------------------</span>
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<pre style="margin: 0;">+<span id="LC744" class="line" lang="plaintext">Kind<span class="idiff left right"> inference in closed type familie</span>s</span>
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<pre style="margin: 0;">+<span id="LC745" class="line" lang="plaintext">------------------<span class="idiff left right">--------------------</span></span>
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<pre style="margin: 0;"> <span id="LC746" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC712" class="line" lang="plaintext">Consider the type ::</span>
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<pre style="margin: 0;">+<span id="LC747" class="line" lang="plaintext">Although all open type families are considered to have a complete</span>
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<pre style="margin: 0;">+<span id="LC748" class="line" lang="plaintext">user-supplied kind signature, we can relax this condition for closed</span>
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<pre style="margin: 0;">+<span id="LC749" class="line" lang="plaintext">type families, where we have equations on which to perform kind</span>
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<pre style="margin: 0;">+<span id="LC750" class="line" lang="plaintext">inference. GHC will infer kinds for the arguments and result types of a</span>
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<pre style="margin: 0;">+<span id="LC751" class="line" lang="plaintext">closed type family.</span>
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<pre style="margin: 0;"> <span id="LC752" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC714" class="line" lang="plaintext"> data G (a :: k) where</span>
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<pre style="margin: 0;">-<span id="LC715" class="line" lang="plaintext"> GInt :: G Int</span>
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<pre style="margin: 0;">-<span id="LC716" class="line" lang="plaintext"> GMaybe :: G Maybe</span>
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<pre style="margin: 0;">+<span id="LC753" class="line" lang="plaintext">GHC supports *kind-indexed* type families, where the family matches both</span>
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<pre style="margin: 0;">+<span id="LC754" class="line" lang="plaintext">on the kind and type. GHC will *not* infer this behaviour without a</span>
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<pre style="margin: 0;">+<span id="LC755" class="line" lang="plaintext">complete user-supplied kind signature, as doing so would sometimes infer</span>
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<pre style="margin: 0;">+<span id="LC756" class="line" lang="plaintext">non-principal types. Indeed, we can see kind-indexing as a form</span>
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<pre style="margin: 0;">+<span id="LC757" class="line" lang="plaintext">of polymorphic recursion, where a type is used at a kind other than</span>
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<pre style="margin: 0;">+<span id="LC758" class="line" lang="plaintext">its most general in its own definition.</span>
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717
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759
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<pre style="margin: 0;"> <span id="LC759" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC718" class="line" lang="plaintext">This datatype ``G`` is GADT-like in both its kind and its type. Suppose you</span>
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719
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<pre style="margin: 0;">-<span id="LC719" class="line" lang="plaintext">have ``g :: G a``, where ``a :: k``. Then pattern matching to discover that</span>
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720
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<pre style="margin: 0;">-<span id="LC720" class="line" lang="plaintext">``g`` is in fact ``GMaybe`` tells you both that ``k ~ (Type -> Type)`` and</span>
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721
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<pre style="margin: 0;">-<span id="LC721" class="line" lang="plaintext">``a ~ Maybe``. The definition for ``G`` requires that :extension:`PolyKinds`</span>
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722
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<pre style="margin: 0;">-<span id="LC722" class="line" lang="plaintext">be in effect, but pattern-matching on ``G`` requires no extension beyond</span>
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723
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<pre style="margin: 0;">-<span id="LC723" class="line" lang="plaintext">:extension:`GADTs`. That this works is actually a straightforward extension</span>
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<pre style="margin: 0;">-<span id="LC724" class="line" lang="plaintext">of regular GADTs and a consequence of the fact that kinds and types are the</span>
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725
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<pre style="margin: 0;">-<span id="LC725" class="line" lang="plaintext">same.</span>
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<pre style="margin: 0;">+<span id="LC760" class="line" lang="plaintext">For example: ::</span>
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761
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<pre style="margin: 0;"> <span id="LC761" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC727" class="line" lang="plaintext">Note that the datatype ``G`` is used at different kinds in its body, and</span>
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<pre style="margin: 0;">-<span id="LC728" class="line" lang="plaintext">therefore that kind-indexed GADTs use a form of polymorphic recursion.</span>
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<pre style="margin: 0;">-<span id="LC729" class="line" lang="plaintext">It is thus only possible to use this feature if you have provided a</span>
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730
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<pre style="margin: 0;">-<span id="LC730" class="line" lang="plaintext">complete user-supplied kind signature</span>
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731
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<pre style="margin: 0;">-<span id="LC731" class="line" lang="plaintext">for the datatype (:ref:`complete-kind-signatures`).</span>
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762
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<pre style="margin: 0;">+<span id="LC762" class="line" lang="plaintext"> type family F1 a where</span>
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763
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<pre style="margin: 0;">+<span id="LC763" class="line" lang="plaintext"> F1 True = False</span>
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764
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<pre style="margin: 0;">+<span id="LC764" class="line" lang="plaintext"> F1 False = True</span>
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765
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<pre style="margin: 0;">+<span id="LC765" class="line" lang="plaintext"> F1 x = x</span>
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766
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<pre style="margin: 0;">+<span id="LC766" class="line" lang="plaintext"> -- F1 fails to compile: kind-indexing is not inferred</span>
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767
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<pre style="margin: 0;">+<span id="LC767" class="line" lang="plaintext"></span>
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768
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<pre style="margin: 0;">+<span id="LC768" class="line" lang="plaintext"> type family F2 (a :: k) where</span>
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769
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<pre style="margin: 0;">+<span id="LC769" class="line" lang="plaintext"> F2 True = False</span>
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<pre style="margin: 0;">+<span id="LC770" class="line" lang="plaintext"> F2 False = True</span>
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<pre style="margin: 0;">+<span id="LC771" class="line" lang="plaintext"> F2 x = x</span>
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<pre style="margin: 0;">+<span id="LC772" class="line" lang="plaintext"> -- F2 fails to compile: no complete signature</span>
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<pre style="margin: 0;">+<span id="LC773" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC774" class="line" lang="plaintext"> type family F3 (a :: k) :: k where</span>
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<pre style="margin: 0;">+<span id="LC775" class="line" lang="plaintext"> F3 True = False</span>
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<pre style="margin: 0;">+<span id="LC776" class="line" lang="plaintext"> F3 False = True</span>
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<pre style="margin: 0;">+<span id="LC777" class="line" lang="plaintext"> F3 x = x</span>
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<pre style="margin: 0;">+<span id="LC778" class="line" lang="plaintext"> -- OK</span>
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<pre style="margin: 0;"> <span id="LC779" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC780" class="line" lang="plaintext">Higher-rank kinds</span>
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<pre style="margin: 0;"> <span id="LC781" class="line" lang="plaintext">-----------------</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6f6cd8b076e4703436a3b31e4eac4a87c7cb8e7f#05e2feaa7ccbd427e12a90d25808ead5ec587c63"><strong>testsuite/tests/dependent/should_fail/T13780a.stderr</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">@@ -3,7 +3,7 @@ T13780a.hs:9:40: error:</td>
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3
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> • Couldn't match kind ‘a’ with ‘Bool’</span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"> Expected kind ‘Foo a’, but ‘MkFoo’ has kind ‘Foo Bool’</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> ‘a’ is a rigid type variable bound by</span>
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext"> <span class="idiff left right">a family instance declaration</span></span>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> <span class="idiff left right">the data constructor ‘SMkFoo’</span></span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext"> at T13780a.hs:9:20-31</span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="plaintext"> • In the second argument of ‘(~)’, namely ‘MkFoo’</span>
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9
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="plaintext"> In the definition of data constructor ‘SMkFoo’</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6f6cd8b076e4703436a3b31e4eac4a87c7cb8e7f#526bbf30531cad446c3194aa829668c9c4650b0a"><strong>testsuite/tests/deriving/should_compile/T11416.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">@@ -12,9 +12,11 @@ newtype T f (a :: ConstantT Type f) = T (f a)</td>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Functor</span></span>
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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="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">TFam1</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">k1</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">k2</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC15" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">TFam1</span> <span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ConstantT</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">f</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TFam1</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">TFam1</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ConstantT</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">k</span><span class="p">)</span> <span class="n" style="color: #333;">f</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TFam1</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Functor</span></span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">TFam2</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">k1</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">k2</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC19" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">TFam2</span> <span class="n" style="color: #333;">f</span> <span class="p">(</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;">ConstantT</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="n" style="color: #333;">f</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TFam2</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">TFam2</span> <span class="p">(</span><span class="n" style="color: #333;">f</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="p">)</span> <span class="p">(</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;">ConstantT</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="n" style="color: #333;">f</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TFam2</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Functor</span></span></pre>
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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">@@ -5,10 +5,12 @@ import Data.Kind (Type)</td>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Cmp</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="LC7" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Sup</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Cmp</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">-<span id="LC8" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">V</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Cmp</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">-<span id="LC9" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Show</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">--</span> V :: a -> Cmp a</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">--</span> deriving (Show, Eq)</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="cm" style="color: #998; font-style: italic;">{-</span></span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">data family CmpInterval (a :: Cmp k) (b :: Cmp k) :: Type</span></span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">data instance CmpInterval (V c) Sup = Starting c</span></span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> deriving( Show )</span></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6f6cd8b076e4703436a3b31e4eac4a87c7cb8e7f#bc4ffdf271cd138b7e3e72937084080b70f4e95b"><strong>testsuite/tests/patsyn/should_fail/T15685.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">T15685.hs:13:24: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • Could not deduce: <span class="idiff left right">a</span> ~ [k0]</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> from the context: as ~ (a<span class="idiff left right">1</span> : as1)</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Could not deduce: <span class="idiff left right">k</span> ~ [k0]</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> from the context: as ~ (a : as1)</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> bound by a pattern with constructor:</span>
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext"> Here :: forall {<span class="idiff left right">a1} (f :: a1 -> *) (a2 :: a1) (as :: [a1</span>]).</span>
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<pre style="margin: 0;">-<span id="LC7" class="line" lang="plaintext"> f a<span class="idiff left right">2 -> NS f (a2</span> : as),</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> Here :: forall {<span class="idiff left right">k} (f :: k -> *) (a :: k) (as :: [k</span>]).</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> f a<span class="idiff left right"> -> NS f (a</span> : as),</span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="plaintext"> in a pattern synonym declaration</span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="plaintext"> at T15685.hs:13:19-26</span>
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<pre style="margin: 0;">-<span id="LC10" class="line" lang="plaintext"> ‘<span class="idiff left right">a</span>’ is a rigid type variable bound by</span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext"> ‘<span class="idiff left right">k</span>’ is a rigid type variable bound by</span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="plaintext"> the inferred type of HereNil :: NS f as</span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="plaintext"> at T15685.hs:13:9-15</span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="plaintext"> Possible fix: add a type signature for ‘HereNil’</span>
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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">T13659.hs:14:<span class="idiff left right">27</span>: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • Expected <span class="idiff left right">a type, but ‘a’ has kind ‘[*]</span>’</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> • In the first argument of ‘Format’, namely ‘<span class="idiff left right">'[Int, a]</span>’</span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> In the type ‘Format <span class="idiff left right">'[Int, a]</span>’</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T13659.hs:14:<span class="idiff left right">15</span>: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Expected <span class="idiff left right">kind ‘[*]’, but ‘a’ has kind ‘*</span>’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> • In the first argument of ‘Format’, namely ‘<span class="idiff left right">a</span>’</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> In the type ‘Format <span class="idiff left right">a</span>’</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> In the definition of data constructor ‘I’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6f6cd8b076e4703436a3b31e4eac4a87c7cb8e7f#4af4eaeded9c126e6a4ee186db90f5b886b80799"><strong>testsuite/tests/polykinds/T16221a.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">T16221a.hs:6:49: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • Expected kind ‘k’, but ‘b’ has kind ‘k<span class="idiff left right">1</span>’</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> ‘k<span class="idiff left right">1</span>’ is a rigid type variable bound by</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Expected kind ‘k’, but ‘b’ has kind ‘k<span class="idiff left right">2</span>’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> ‘k<span class="idiff left right">2</span>’ is a rigid type variable bound by</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> an explicit forall k (b :: k)</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> at T16221a.hs:6:20</span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext"> ‘k’ is a rigid type variable bound by</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6f6cd8b076e4703436a3b31e4eac4a87c7cb8e7f#963e82a98233f65b20b6eed015bb2bd423433593"><strong>testsuite/tests/th/T9692.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">@@ -12,7 +12,7 @@ class C a where</td>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">F</span> <span class="n" style="color: #333;">a</span> <span class="p">(</span><span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">k</span><span class="p">)</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span></span>
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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;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="kt" style="color: #458; font-weight: 600;">Int</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="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">F</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="n" style="color: #333;"><span class="idiff left right">x</span></span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FInt</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">F</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">x</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">Type</span></span><span class="p"><span class="idiff right">)</span></span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FInt</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"><span class="o" style="font-weight: 600;">$</span><span class="p">(</span> <span class="kr" style="font-weight: 600;">do</span> <span class="n" style="color: #333;">info</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">qReify</span> <span class="p">(</span><span class="n" style="color: #333;">mkName</span> <span class="s" style="color: #d14;">"F"</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"> <span class="n" style="color: #333;">runIO</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">putStrLn</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">pprint</span> <span class="n" style="color: #333;">info</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6f6cd8b076e4703436a3b31e4eac4a87c7cb8e7f#dac489fd9971f93cf5f4c1655e3ab898e190a541"><strong>testsuite/tests/typecheck/should_compile/T18891.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, UnliftedNewtypes, StandaloneKindSignatures, RankNTypes, TypeFamilies, PolyKinds #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18891</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Exts</span><span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">TYPE</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">T2</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">k</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">T2</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;">MkT2</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">T2</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span></span>
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10
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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;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">N3</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TYPE</span> <span class="n" style="color: #333;">k</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;">MkN3</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">N3</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">N3</span> <span class="n" style="color: #333;">m</span></span>
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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;">type</span> <span class="kt" style="color: #458; font-weight: 600;">N4</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TYPE</span> <span class="n" style="color: #333;">k</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">N4</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TYPE</span> <span class="n" style="color: #333;">k</span> <span class="kr" style="font-weight: 600;">where</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;">MkN4</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">N4</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">N4</span> <span class="n" style="color: #333;">m</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6f6cd8b076e4703436a3b31e4eac4a87c7cb8e7f#460a0a2288242ede875741a395ec8673b7a822d0"><strong>testsuite/tests/typecheck/should_compile/UnliftedNewtypesUnassociatedFamily.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">@@ -4,6 +4,8 @@</td>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE PolyKinds #-}</span></span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE MagicHash #-}</span></span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE UnboxedTuples #-}</span></span>
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<pre style="margin: 0;">+<span id="LC7" 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="LC8" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE TypeApplications #-}</span></span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">UnliftedNewtypesUnassociatedFamily</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>
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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">@@ -20,7 +22,16 @@ newtype instance DFT ('TupleRep '[ 'IntRep, 'WordRep])</td>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">DFT</span> <span class="kt" style="color: #458; font-weight: 600;">'LiftedRep</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkDFT4</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">MkDFT5</span></span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">DF</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TYPE</span> <span class="p">(</span><span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">RuntimeRep</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC23" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">DF</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkDF1</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="o" style="font-weight: 600;">#</span></span>
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<pre style="margin: 0;">-<span id="LC24" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">DF</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkDF2</span> <span class="kt" style="color: #458; font-weight: 600;">Word</span><span class="o" style="font-weight: 600;">#</span></span>
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<pre style="margin: 0;">-<span id="LC25" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">DF</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkDF3</span> <span class="p">(</span><span class="o" style="font-weight: 600;">#</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="o" style="font-weight: 600;">#</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Word</span><span class="o" style="font-weight: 600;">#</span> <span class="o" style="font-weight: 600;">#</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Use a type application</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">DF</span> <span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">IntRep</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkDF1</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="o" style="font-weight: 600;">#</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Use a kind signature</span></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">DF</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TYPE</span> <span class="kt" style="color: #458; font-weight: 600;">'WordRep</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MkDF2</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Word</span><span class="o" style="font-weight: 600;">#</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DF</span></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Also uses a kind signature</span></span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">DF</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TYPE</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">'TupleRep</span> <span class="n" style="color: #333;">'</span><span class="p">[</span> <span class="kt" style="color: #458; font-weight: 600;">'IntRep</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">'WordRep</span> <span class="p">])</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MkDF3</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="o" style="font-weight: 600;">#</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="o" style="font-weight: 600;">#</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Word</span><span class="o" style="font-weight: 600;">#</span> <span class="o" style="font-weight: 600;">#</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DF</span></span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">DF</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkDF4</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">MkDF5</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6f6cd8b076e4703436a3b31e4eac4a87c7cb8e7f#8a9c9b7ef8854c111f962e63af9191c2300a6382"><strong>testsuite/tests/typecheck/should_compile/UnliftedNewtypesUnifySig.hs</strong></a>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">UnliftedNewtypesUnassociatedFamily</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>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Int</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">I</span><span class="o" style="font-weight: 600;">#</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC13" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Exts</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="o" style="font-weight: 600;">#</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">Word</span><span class="o" style="font-weight: 600;">#</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">RuntimeRep</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IntRep</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Exts</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="o" style="font-weight: 600;">#</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">Word</span><span class="o" style="font-weight: 600;">#</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">RuntimeRep</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IntRep</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">WordRep</span></span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Exts</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TYPE</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">KindOf</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TYPE</span> <span class="n" style="color: #333;">k</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">k</span></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">D</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TYPE</span> <span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TYPE</span> <span class="n" style="color: #333;">r</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="kr" style="font-weight: 600;">newtype</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">D</span> <span class="n" style="color: #333;"><span class="idiff left right">a</span></span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkWordD</span> <span class="kt" style="color: #458; font-weight: 600;">Word</span><span class="o" style="font-weight: 600;">#</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">D</span> <span class="p"><span class="idiff left">(</span></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">TYPE</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">'WordRep</span></span><span class="p"><span class="idiff right">)</span></span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkWordD</span> <span class="kt" style="color: #458; font-weight: 600;">Word</span><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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<pre style="margin: 0;">-<span id="LC22" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">D</span> <span class="n" style="color: #333;"><span class="idiff left right">a</span></span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TYPE</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">KindOf</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC23" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MkIntD</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">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">TYPE</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">'IntRep</span></span><span class="p"><span class="idiff">)</span></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">Int</span></span><span class="o" style="font-weight: 600;"><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">D</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">a</span></span></span></pre>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">D</span> <span class="p"><span class="idiff left">(</span></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">TYPE</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">'IntRep</span></span><span class="p"><span class="idiff right">)</span></span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TYPE</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">KindOf</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MkIntD</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">b</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">TYPE</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">'IntRep</span></span><span class="p"><span class="idiff">)</span></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">Int</span></span><span class="o" style="font-weight: 600;"><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">D</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">b</span></span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6f6cd8b076e4703436a3b31e4eac4a87c7cb8e7f#34fe7bf0e6fbf60effb28393399ba68666593909"><strong>testsuite/tests/typecheck/should_compile/all.T</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -728,4 +728,5 @@ test('T18831', normal, compile, [''])</td>
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<pre style="margin: 0;"> <span id="LC728" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18920</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC729" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T15942</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC730" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">ClassDefaultInHsBoot</span><span class="p">',</span> <span class="p">[</span><span class="nv" style="color: #008080;">extra_files</span><span class="p">(['</span><span class="s1" style="color: #d14;">ClassDefaultInHsBootA1.hs</span><span class="p">','</span><span class="s1" style="color: #d14;">ClassDefaultInHsBootA2.hs</span><span class="p">','</span><span class="s1" style="color: #d14;">ClassDefaultInHsBootA2.hs-boot</span><span class="p">','</span><span class="s1" style="color: #d14;">ClassDefaultInHsBootA3.hs</span><span class="p">'])],</span> <span class="nv" style="color: #008080;">multimod_compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">ClassDefaultInHsBoot</span><span class="p">',</span> <span class="p">'</span><span class="s1" style="color: #d14;">-v0</span><span class="p">'])</span></span>
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<pre style="margin: 0;">+<span id="LC731" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18891</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC732" class="line" lang="perl"></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6f6cd8b076e4703436a3b31e4eac4a87c7cb8e7f#4968e845853db814d0441fbf636d7b942d6beca2"><strong>testsuite/tests/typecheck/should_fail/T18891a.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, UnliftedNewtypes, StandaloneKindSignatures, RankNTypes, TypeFamilies, PolyKinds #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18891</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Exts</span><span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">TYPE</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">N1</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">k</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">TYPE</span> <span class="n" style="color: #333;">k</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MkN1</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">N1</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">N1</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">N2</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">k</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">TYPE</span> <span class="n" style="color: #333;">k</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">N2</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">k</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">TYPE</span> <span class="n" style="color: #333;">k</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;">MkN2</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">N2</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">N2</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6f6cd8b076e4703436a3b31e4eac4a87c7cb8e7f#00704c21d708b5b0eae6c68bd8d6a0559be1c753"><strong>testsuite/tests/typecheck/should_fail/T18891a.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">T18891a.hs:8:4: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • A newtype constructor must have a return type of form T a1 ... an</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> MkN1 :: N1 -> N1</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> • In the definition of data constructor ‘MkN1’</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> In the newtype declaration for ‘N1’</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext">T18891a.hs:12:3: error:</span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext"> • A newtype constructor must have a return type of form T a1 ... an</span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext"> MkN2 :: N2 -> N2</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext"> • In the definition of data constructor ‘MkN2’</span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext"> In the newtype declaration for ‘N2’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6f6cd8b076e4703436a3b31e4eac4a87c7cb8e7f#9d34b8cddaf28088631549895343f495bc16ad14"><strong>testsuite/tests/typecheck/should_fail/UnliftedNewtypesFamilyKindFail2.stderr</strong></a>
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<pre style="margin: 0;">-<span id="LC1" class="line" lang="plaintext">UnliftedNewtypesFamilyKindFail2.hs:12:20:</span>
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<pre style="margin: 0;">-<span id="LC2" class="line" lang="plaintext"> Expected a type, but ‘5’ has kind ‘GHC.Num.Natural.Natural’</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> In the first argument of ‘F’, namely ‘5’</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> In the newtype instance declaration for ‘F’</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">UnliftedNewtypesFamilyKindFail2.hs:12:31:</span>
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<pre style="margin: 0;">-<span id="LC7" class="line" lang="plaintext"> Expected a type, but ‘5’ has kind ‘GHC.Num.Natural.Natural’</span>
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<pre style="margin: 0;">-<span id="LC8" class="line" lang="plaintext"> In the first argument of ‘F’, namely ‘5’</span>
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<pre style="margin: 0;">-<span id="LC9" class="line" lang="plaintext"> In the type ‘(F 5)’</span>
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<pre style="margin: 0;">-<span id="LC10" class="line" lang="plaintext"> In the definition of data constructor ‘MkF’</span>
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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">UnliftedNewtypesFamilyKindFail2.hs:12:20: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Expected a type, but ‘5’ has kind ‘GHC.Num.Natural.Natural’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> • In the first argument of ‘F’, namely ‘5’</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> In the newtype instance declaration for ‘F’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6f6cd8b076e4703436a3b31e4eac4a87c7cb8e7f#b66ac8a3829a9ca3a4bbfecd10731b973b1e5f1a"><strong>testsuite/tests/typecheck/should_fail/UnliftedNewtypesUnassociatedFamilyFail.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 UnliftedNewtypes #-}</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 DataKinds #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE TypeFamilies #-}</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE PolyKinds #-}</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE MagicHash #-}</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE UnboxedTuples #-}</span></span>
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<pre style="margin: 0;">+<span id="LC7" 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="LC8" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">UnliftedNewtypesUnassociatedFamily</span> <span class="kr" style="font-weight: 600;">where</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;">import</span> <span class="nn" style="color: #555;">GHC.Int</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">I</span><span class="o" style="font-weight: 600;">#</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Word</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Word</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">W</span><span class="o" style="font-weight: 600;">#</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Exts</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="o" style="font-weight: 600;">#</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">Word</span><span class="o" style="font-weight: 600;">#</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Exts</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TYPE</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">RuntimeRep</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LiftedRep</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">IntRep</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">WordRep</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">TupleRep</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">DF</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TYPE</span> <span class="p">(</span><span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">RuntimeRep</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- All these fail: see #18891 and !4419</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Kind inference for data family instances]</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- in GHC.Tc.TyCl.Instance</span></span>
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21
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">DF</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkDF1a</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="o" style="font-weight: 600;">#</span></span>
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22
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">DF</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkDF2a</span> <span class="kt" style="color: #458; font-weight: 600;">Word</span><span class="o" style="font-weight: 600;">#</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">DF</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkDF3a</span> <span class="p">(</span><span class="o" style="font-weight: 600;">#</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="o" style="font-weight: 600;">#</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Word</span><span class="o" style="font-weight: 600;">#</span> <span class="o" style="font-weight: 600;">#</span><span class="p">)</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6f6cd8b076e4703436a3b31e4eac4a87c7cb8e7f#f7d92892f9d0ace042113231c65d6e509b3393d3"><strong>testsuite/tests/typecheck/should_fail/UnliftedNewtypesUnassociatedFamilyFail.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">UnliftedNewtypesUnassociatedFamilyFail.hs:21:30: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Expecting a lifted type, but ‘Int#’ is unlifted</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> • In the type ‘Int#’</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> In the definition of data constructor ‘MkDF1a’</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> In the newtype instance declaration for ‘DF’</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext">UnliftedNewtypesUnassociatedFamilyFail.hs:22:30: error:</span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext"> • Expecting a lifted type, but ‘Word#’ is unlifted</span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext"> • In the type ‘Word#’</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext"> In the definition of data constructor ‘MkDF2a’</span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext"> In the newtype instance declaration for ‘DF’</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="LC14" class="line" lang="plaintext">UnliftedNewtypesUnassociatedFamilyFail.hs:23:30: error:</span>
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15
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext"> • Expecting a lifted type, but ‘(# Int#, Word# #)’ is unlifted</span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="plaintext"> • In the type ‘(# Int#, Word# #)’</span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="plaintext"> In the definition of data constructor ‘MkDF3a’</span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext"> In the newtype instance declaration for ‘DF’</span></pre>
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<li id="b9e86d897a62509b0114d81d5e736630d6f68f43">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6f6cd8b076e4703436a3b31e4eac4a87c7cb8e7f#b9e86d897a62509b0114d81d5e736630d6f68f43"><strong>testsuite/tests/typecheck/should_fail/all.T</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="546" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -546,6 +546,7 @@ test('UnliftedNewtypesConstraintFamily', normal, compile_fail, [''])</td>
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546
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546
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<pre style="margin: 0;"> <span id="LC546" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">UnliftedNewtypesMismatchedKind</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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547
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547
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<pre style="margin: 0;"> <span id="LC547" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">UnliftedNewtypesMismatchedKindRecord</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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548
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548
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<pre style="margin: 0;"> <span id="LC548" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">UnliftedNewtypesMultiFieldGadt</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="LC549" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">UnliftedNewtypesUnassociatedFamilyFail</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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550
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<pre style="margin: 0;"> <span id="LC550" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T13834</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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550
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551
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<pre style="margin: 0;"> <span id="LC551" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17077</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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552
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<pre style="margin: 0;"> <span id="LC552" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T16512a</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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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="589" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="590" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -589,3 +590,4 @@ test('T18640b', normal, compile_fail, [''])</td>
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589
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590
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<pre style="margin: 0;"> <span id="LC590" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18640c</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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590
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591
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<pre style="margin: 0;"> <span id="LC591" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T10709</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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591
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592
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<pre style="margin: 0;"> <span id="LC592" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T10709b</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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593
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<pre style="margin: 0;">+<span id="LC593" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18891a</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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