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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:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/558cabbc5fbd34d4bd47acf50a1c22d44dd41b97">558cabbc</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-12-03T23:22:20+00:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix kind inference for data types. Again.
This patch fixes several aspects of kind inference for data type
declarations, especially data /instance/ declarations
Specifically
1. 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 no 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]
2. Do not look at the constructor decls of a data/newtype instance
in tcDataFamInstanceHeader. See GHC.Tc.TyCl.Instance
Note [Kind inference for data family instances]. This was a
new realisation that arose when doing (1)
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".
3. Minor improvement in kcTyClDecl, combining GADT and H98 cases
4. Fix #14111 and #8707 by allowing the header of a data instance
to affect kind inferece for the the data constructor signatures;
as described at length in Note [GADT return types] in GHC.Tc.TyCl
This led to a modest refactoring of the arguments (and argument
order) of tcConDecl/tcConDecls.
5. Fix #19000 by inverting the sense of the test in new_locs
in GHC.Tc.Solver.Canonical.canDecomposableTyConAppOK.
Rather to my surprise, CI tells us that we get quite a few compile time
perf improvements in compiler bytes-allocated. Here are the ones that
reduced more than 1%. Good news! I have no idea why.
Test Metric value New value Change
---------------------------------------------------------------------------
ManyAlternatives(normal) ghc/alloc 803792416.0 800063504.0 -0.5%
Naperian(optasm) ghc/alloc 54311984.0 52874144.0 -2.6% GOOD
PmSeriesG(normal) ghc/alloc 57119912.0 53369856.0 -6.6%
PmSeriesS(normal) ghc/alloc 71507464.0 67756248.0 -5.2%
PmSeriesT(normal) ghc/alloc 104597416.0 100846208.0 -3.6%
PmSeriesV(normal) ghc/alloc 70326360.0 66576336.0 -5.3%
T10421(normal) ghc/alloc 132567776.0 128845672.0 -2.8% GOOD
T10421a(normal) ghc/alloc 94605104.0 90858592.0 -4.0%
T10547(normal) ghc/alloc 34996968.0 33557256.0 -4.1% GOOD
T10858(normal) ghc/alloc 212086488.0 208375832.0 -1.7%
T11195(normal) ghc/alloc 310033360.0 306391248.0 -1.2%
T11276(normal) ghc/alloc 145378016.0 141657896.0 -2.6%
T11303b(normal) ghc/alloc 55148504.0 51404904.0 -6.8%
T11374(normal) ghc/alloc 243783840.0 240133008.0 -1.5%
T11822(normal) ghc/alloc 154231136.0 150490720.0 -2.4%
T12150(optasm) ghc/alloc 94489040.0 90752656.0 -4.0% GOOD
T12234(optasm) ghc/alloc 69407208.0 65659624.0 -5.4% GOOD
T12425(optasm) ghc/alloc 115122960.0 111397664.0 -3.2% GOOD
T13035(normal) ghc/alloc 118754176.0 114795136.0 -3.3% GOOD
T13253-spj(normal) ghc/alloc 168969768.0 165225400.0 -2.2% GOOD
T15630(normal) ghc/alloc 201226672.0 197491904.0 -1.9%
T16190(normal) ghc/alloc 289119984.0 285560848.0 -1.2%
T17096(normal) ghc/alloc 326080472.0 322369512.0 -1.1%
T17836b(normal) ghc/alloc 69578304.0 65830328.0 -5.4%
T17977(normal) ghc/alloc 55833520.0 52094448.0 -6.7%
T17977b(normal) ghc/alloc 50731152.0 46983088.0 -7.4%
T18140(normal) ghc/alloc 120628376.0 116879552.0 -3.1% GOOD
T18282(normal) ghc/alloc 170207168.0 166491784.0 -2.2% GOOD
T18304(normal) ghc/alloc 107596576.0 103853360.0 -3.5% GOOD
T3064(normal) ghc/alloc 209696560.0 205954384.0 -1.8%
T4801(normal) ghc/alloc 376239392.0 372505256.0 -1.0%
T5030(normal) ghc/alloc 388667176.0 384947480.0 -1.0%
T5321FD(normal) ghc/alloc 332509600.0 328779208.0 -1.1%
T5321Fun(normal) ghc/alloc 379067288.0 375338056.0 -1.0%
T5837(normal) ghc/alloc 46272360.0 42540544.0 -8.1% GOOD
T6048(optasm) ghc/alloc 99200336.0 95462744.0 -3.8% GOOD
T9020(optasm) ghc/alloc 282057000.0 278339944.0 -1.3%
T9233(normal) ghc/alloc 967401992.0 963669872.0 -0.4%
</pre>
</li>
</ul>
<h4>30 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#576dff4e64fa03683ffc5dcdd58284acdd70bc8e">
compiler/GHC/Hs/Extension.hs
</a>
</li>
<li class="file-stats">
<a href="#9355bef855426caf5f526925edf351b20f9a86c4">
compiler/GHC/Tc/Gen/HsType.hs
</a>
</li>
<li class="file-stats">
<a href="#f018e77421f495c6f75733fee4a511cfe57bebe8">
compiler/GHC/Tc/Solver/Canonical.hs
</a>
</li>
<li class="file-stats">
<a href="#83d23a46bb6cdc8b1edc16f1fd2c8f5c53e2c9ca">
compiler/GHC/Tc/TyCl.hs
</a>
</li>
<li class="file-stats">
<a href="#e63425e031ffe9350ee6b1687e506aaea75d11e1">
compiler/GHC/Tc/TyCl/Instance.hs
</a>
</li>
<li class="file-stats">
<a href="#d87dfc77856eeaef6134e28336290ddcbcf18d7d">
docs/users_guide/9.2.1-notes.rst
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</li>
<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>
<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="#f40c9b04fcb3dedd30e8d1d111028fd38a3bd533">
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testsuite/tests/indexed-types/should_compile/T14111.hs
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<li class="file-stats">
<a href="#ebaa39285a49455fd932d452d44b589c7d50f8f3">
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testsuite/tests/indexed-types/should_compile/T8707.hs
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<li class="file-stats">
<a href="#58b9bc2ffb1c7d7b545e6aada524a5d53266e95e">
testsuite/tests/indexed-types/should_compile/all.T
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</li>
<li class="file-stats">
<a href="#9ce3533e3d2bdc2ed2d290e31021207c39fd5729">
testsuite/tests/indexed-types/should_fail/T8368.stderr
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<li class="file-stats">
<a href="#022292799466b9b31e4522069903c5b0fac15e9c">
testsuite/tests/indexed-types/should_fail/T8368a.stderr
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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="#5c74fb2bdbb2042694ffd2e618b0efb408c68d8e">
testsuite/tests/th/T11145.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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<li class="file-stats">
<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">
<span class="new-file">
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testsuite/tests/typecheck/should_fail/T18891a.hs
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<li class="file-stats">
<a href="#00704c21d708b5b0eae6c68bd8d6a0559be1c753">
<span class="new-file">
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testsuite/tests/typecheck/should_fail/T18891a.stderr
</span>
</a>
</li>
<li class="file-stats">
<a href="#9d34b8cddaf28088631549895343f495bc16ad14">
testsuite/tests/typecheck/should_fail/UnliftedNewtypesFamilyKindFail2.stderr
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</li>
<li class="file-stats">
<a href="#b66ac8a3829a9ca3a4bbfecd10731b973b1e5f1a">
<span class="new-file">
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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
</a>
</li>
</ul>
<h4>Changes:</h4>
<li id="576dff4e64fa03683ffc5dcdd58284acdd70bc8e">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/558cabbc5fbd34d4bd47acf50a1c22d44dd41b97#576dff4e64fa03683ffc5dcdd58284acdd70bc8e"><strong>compiler/GHC/Hs/Extension.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="253" 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">@@ -253,9 +253,9 @@ sure that any uses of it as a field are strict.</td>
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<pre style="margin: 0;"> <span id="LC253" class="line" lang="haskell"><span class="cd">-- | Used as a data type index for the hsSyn AST; also serves</span></span>
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<pre style="margin: 0;"> <span id="LC254" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- as a singleton type for Pass</span></span>
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<pre style="margin: 0;"> <span id="LC255" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPass</span> <span class="p">(</span><span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Pass</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<td class="diff-line-num new_line old" data-linenumber="256" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC256" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">GhcP<span class="idiff left right">s</span></span></span>
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<td class="diff-line-num old old_line" data-linenumber="257" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC257" class="line" lang="haskell"> <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;">Ghc<span class="idiff left right">Rn</span></span></span>
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<pre style="margin: 0;">-<span id="LC258" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ghc<span class="idiff left right">Tc</span></span></span>
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<pre style="margin: 0;">+<span id="LC256" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">GhcP<span class="idiff left">ass</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">'Parsed</span></span></span>
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<pre style="margin: 0;">+<span id="LC257" class="line" lang="haskell"> <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;">Ghc<span class="idiff left">Pass</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">'Renamed</span></span></span>
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<pre style="margin: 0;">+<span id="LC258" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ghc<span class="idiff left">Pass</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">'Typechecked</span></span></span>
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259
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<pre style="margin: 0;"> <span id="LC259" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC260" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This really should never be entered, but the data-deriving machinery</span></span>
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261
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<pre style="margin: 0;"> <span id="LC261" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- needs the instance to exist.</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/558cabbc5fbd34d4bd47acf50a1c22d44dd41b97#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">@@ -2986,7 +2986,7 @@ bindOuterSigTKBndrs_Tv_M :: TcTyMode</td>
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<pre style="margin: 0;"> <span id="LC2986" 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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2987
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2987
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<pre style="margin: 0;"> <span id="LC2987" 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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2988
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2988
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<pre style="margin: 0;"> <span id="LC2988" 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="LC2989" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note [<span class="idiff left right">Kind-checking for GADTs] in </span>TyCl</span></span>
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<pre style="margin: 0;">+<span id="LC2989" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note [<span class="idiff left right">Using TyVarTvs for kind-checking GADTs] in GHC.Tc.</span>TyCl</span></span>
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<pre style="margin: 0;"> <span id="LC2990" 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="LC2991" 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="LC2992" 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="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -3299,8 +3299,8 @@ When we /must/ clone.</td>
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<pre style="margin: 0;"> <span id="LC3299" 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="LC3300" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3301" 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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3302
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<pre style="margin: 0;">-<span id="LC3302" 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="LC3303" 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="LC3302" 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="LC3303" 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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3304
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<pre style="margin: 0;"> <span id="LC3304" 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="LC3305" 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="LC3306" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/558cabbc5fbd34d4bd47acf50a1c22d44dd41b97#f018e77421f495c6f75733fee4a511cfe57bebe8"><strong>compiler/GHC/Tc/Solver/Canonical.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">@@ -1885,7 +1885,7 @@ canDecomposableTyConAppOK ev eq_rel tc tys1 tys2</td>
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<pre style="margin: 0;"> <span id="LC1885" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">bndr</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tyConBinders</span> <span class="n" style="color: #333;">tc</span></span>
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<pre style="margin: 0;"> <span id="LC1886" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">new_loc0</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isNamedTyConBinder</span> <span class="n" style="color: #333;">bndr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">toKindLoc</span> <span class="n" style="color: #333;">loc</span></span>
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<pre style="margin: 0;"> <span id="LC1887" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">loc</span></span>
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<pre style="margin: 0;">-<span id="LC1888" class="line" lang="haskell"> <span class="n" style="color: #333;">new_loc</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">is<span class="idiff left right">V</span>isibleTyConBinder</span> <span class="n" style="color: #333;">bndr</span></span>
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<pre style="margin: 0;">+<span id="LC1888" class="line" lang="haskell"> <span class="n" style="color: #333;">new_loc</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">is<span class="idiff left right">Inv</span>isibleTyConBinder</span> <span class="n" style="color: #333;">bndr</span></span>
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<pre style="margin: 0;"> <span id="LC1889" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">updateCtLocOrigin</span> <span class="n" style="color: #333;">new_loc0</span> <span class="n" style="color: #333;">toInvisibleOrigin</span></span>
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<pre style="margin: 0;"> <span id="LC1890" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;"> <span id="LC1891" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">new_loc0</span> <span class="p">]</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/558cabbc5fbd34d4bd47acf50a1c22d44dd41b97#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">@@ -17,7 +17,8 @@ module GHC.Tc.TyCl (</td>
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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;">-- Functions used by GHC.Tc.TyCl.Instance to check</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;">-- data/type family instance declarations</span></span>
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<pre style="margin: 0;">-<span id="LC20" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">kcConDecls</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcConDecls</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">dataDeclChecks</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkValidTyCon</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">kcConDecls</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcConDecls</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">DataDeclInfo</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">dataDeclChecks</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkValidTyCon</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcFamTyPats</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcTyFamInstEqn</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcAddTyFamInstCtxt</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcMkDataFamInstCtxt</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcAddDataFamInstCtxt</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">unravelFamInstPats</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">addConsistencyConstraints</span><span class="p">,</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -38,7 +39,7 @@ import GHC.Tc.Solver( pushLevelAndSolveEqualities, pushLevelAndSolveEqualitiesX</td>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">reportUnsolvedEqualities</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Monad</span></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Env</span></span>
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<pre style="margin: 0;">-<span id="LC41" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Unify</span><span class="p">(</span> <span class="n" style="color: #333;">emitResidualTvConstraint</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC42" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Unify</span><span class="p">(</span> <span class="n" style="color: #333;"><span class="idiff left">unifyType</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">emitResidualTvConstraint</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types.Constraint</span><span class="p">(</span> <span class="n" style="color: #333;">emptyWC</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Validity</span></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Zonk</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">@@ -130,7 +131,7 @@ Note [Check role annotations in a second pass]</td>
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<pre style="margin: 0;"> <span id="LC131" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Role inference potentially depends on the types of all of the datacons declared</span></span>
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<pre style="margin: 0;"> <span id="LC132" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in a mutually recursive group. The validity of a role annotation, in turn,</span></span>
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<pre style="margin: 0;"> <span id="LC133" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">depends on the result of role inference. Because the types of datacons might</span></span>
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<pre style="margin: 0;">-<span id="LC133" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">be ill-formed (see #7175 and Note [<span class="idiff left right">Checking GADT return typ</span>es]) we must check</span></span>
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<pre style="margin: 0;">+<span id="LC134" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">be ill-formed (see #7175 and Note [<span class="idiff left right">rejigConR</span>es]) we must check</span></span>
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<pre style="margin: 0;"> <span id="LC135" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">*all* the tycons in a group for validity before checking *any* of the roles.</span></span>
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<pre style="margin: 0;"> <span id="LC136" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Thus, we take two passes over the resulting tycons, first checking for general</span></span>
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<pre style="margin: 0;"> <span id="LC137" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">validity and then checking for valid role annotations.</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">@@ -1529,27 +1530,16 @@ kcTyClDecl :: TyClDecl GhcRn -> TcTyCon -> TcM ()</td>
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1529
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<pre style="margin: 0;"> <span id="LC1530" 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="LC1531" 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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<pre style="margin: 0;"> <span id="LC1532" class="line" lang="haskell"></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>
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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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<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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<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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1543
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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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1544
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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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1545
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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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1546
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<pre style="margin: 0;">-<span id="LC1546" class="line" lang="haskell"></span>
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1547
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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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1533
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<pre style="margin: 0;">+<span id="LC1533" 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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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_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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1550
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1535
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<pre style="margin: 0;"> <span id="LC1535" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="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="LC1536" 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="LC1537" 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="LC1538" 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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1539
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<pre style="margin: 0;">+<span id="LC1539" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (conceivably) shadowed.</span></span>
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1540
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<pre style="margin: 0;">+<span id="LC1540" 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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1541
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<pre style="margin: 0;">+<span id="LC1541" 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="LC1542" 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="LC1543" class="line" lang="haskell"> <span class="p">}</span></span>
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1544
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<pre style="margin: 0;"> <span id="LC1544" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1545" 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 +1596,12 @@ kcConGADTArgs new_or_data res_kind con_args = case con_args of</td>
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<pre style="margin: 0;"> <span id="LC1596" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1597" 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="LC1598" 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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<pre style="margin: 0;">+<span id="LC1599" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Used only in H98 case</span></span>
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1609
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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="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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<pre style="margin: 0;"> <span id="LC1601" 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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<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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<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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1615
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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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1602
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<pre style="margin: 0;">+<span id="LC1602" 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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1603
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<pre style="margin: 0;">+<span id="LC1603" 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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1604
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<pre style="margin: 0;">+<span id="LC1604" 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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1605
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<pre style="margin: 0;"> <span id="LC1605" class="line" lang="haskell"></span>
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1617
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1606
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<pre style="margin: 0;"> <span id="LC1606" 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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1618
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1607
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<pre style="margin: 0;"> <span id="LC1607" 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 +1612,69 @@ kcConDecl :: NewOrData</td>
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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="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="LC1613" 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="LC1614" 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="LC1615" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Used only in H98 case</span></span>
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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;">ConDecl</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span></span>
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<pre style="margin: 0;"> <span id="LC1617" 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="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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<pre style="margin: 0;">+<span id="LC1618" 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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<pre style="margin: 0;"> <span id="LC1619" 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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<pre style="margin: 0;"> <span id="LC1620" 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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<pre style="margin: 0;">-<span id="LC1631" 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;">dataConCtxt<span class="idiff left right">Name</span></span> <span class="p">[</span><span class="n" style="color: #333;">name</span><span class="p">])</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC1621" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addErrCtxt</span> <span class="p">(</span><span class="n" style="color: #333;">dataConCtxt</span> <span class="p">[</span><span class="n" style="color: #333;">name</span><span class="p">])</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC1622" class="line" lang="haskell"> <span class="n" style="color: #333;">discardResult</span> <span class="o" style="font-weight: 600;">$</span></span>
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1623
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<pre style="margin: 0;"> <span id="LC1623" class="line" lang="haskell"> <span class="n" style="color: #333;">bindExplicitTKBndrs_Tv</span> <span class="n" style="color: #333;">ex_tvs</span> <span class="o" style="font-weight: 600;">$</span></span>
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1634
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1624
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<pre style="margin: 0;"> <span id="LC1624" 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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1625
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<pre style="margin: 0;">+<span id="LC1625" 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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<td class="diff-line-num new_line" data-linenumber="1626" 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">
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;">-- We don't need to check the telescope here,</span></span>
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1637
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<td class="diff-line-num new_line" data-linenumber="1627" 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">
1627
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<pre style="margin: 0;"> <span id="LC1627" 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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1628
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<pre style="margin: 0;"> <span id="LC1628" class="line" lang="haskell"> <span class="p">}</span></span>
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1639
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1629
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<pre style="margin: 0;"> <span id="LC1629" 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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1630
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<pre style="margin: 0;">+<span id="LC1630" 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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1631
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<pre style="margin: 0;">+<span id="LC1631" 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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1632
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<pre style="margin: 0;">+<span id="LC1632" 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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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_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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1634
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<pre style="margin: 0;"> <span id="LC1634" 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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<td class="diff-line-num new_line old" data-linenumber="1635" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="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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1650
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<pre style="margin: 0;">-<span id="LC1650" 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;">$</span></span>
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1635
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<pre style="margin: 0;">+<span id="LC1635" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [kcConDecls: kind-checking data type decls]</span></span>
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1636
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<pre style="margin: 0;">+<span id="LC1636" class="line" lang="haskell"> <span class="n" style="color: #333;">addErrCtxt</span> <span class="p">(</span><span class="n" style="color: #333;">dataConCtxt</span> <span class="n" style="color: #333;">names</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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1651
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1637
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<pre style="margin: 0;"> <span id="LC1637" class="line" lang="haskell"> <span class="n" style="color: #333;">discardResult</span> <span class="o" style="font-weight: 600;">$</span></span>
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1652
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1638
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<pre style="margin: 0;"> <span id="LC1638" class="line" lang="haskell"> <span class="n" style="color: #333;">bindOuterSigTKBndrs_Tv</span> <span class="n" style="color: #333;">outer_bndrs</span> <span class="o" style="font-weight: 600;">$</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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1639
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<pre style="margin: 0;">+<span id="LC1639" 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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1640
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<pre style="margin: 0;"> <span id="LC1640" 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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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;">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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1642
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<pre style="margin: 0;">+<span id="LC1642" 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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1643
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<pre style="margin: 0;">+<span id="LC1643" 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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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;">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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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;">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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1646
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<pre style="margin: 0;"> <span id="LC1646" 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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1647
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<pre style="margin: 0;"> <span id="LC1647" 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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<td class="diff-line-num new_line old" data-linenumber="1648" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="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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<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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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;">{- Note [kcConDecls: kind-checking data type decls]</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;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</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;">kcConDecls is used when we are inferring the kind of the type</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;">constructor in a data type declaration. E.g.</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;"> data T f a = MkT (f a)</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;">we want to infer the kind of 'f' and 'a'. The basic plan is described</span></span>
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1654
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<pre style="margin: 0;">+<span id="LC1654" 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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1655
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<pre style="margin: 0;">+<span id="LC1655" class="line" lang="haskell"></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;">In the H98 case, for unlifted newtypes only, we need the result kind of</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;">the TyCon, to unify with the argument kind. The tycon's result kind</span></span>
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1658
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<pre style="margin: 0;">+<span id="LC1658" 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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1659
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<pre style="margin: 0;">+<span id="LC1659" class="line" lang="haskell"></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;">In the GADT case we may have this:</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;"> data T f a where</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;"> MkT :: forall g b. g b -> T g b</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;">Notice that the variables f,a, and g,b are quite distinct.</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;">Nevertheless, this decl must still influence the kind T (which is,</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;">remember Step 1, something like T :: kappa1 -> kappa2 -> Type), otherwise</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;">we'd infer the bogus kind T :: forall k1 k2. k1 -> k2 -> 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;">The data constructor type influences the kind of T simply by</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;">kind-checking the result type (T g b), which will force 'f' and 'g' 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;">have the same kinds. This is the call to</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;"> tcCheckLHsType res_ty (TheKind con_res_kind)</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;">Because this is the result type of an arrow, we know the kind must be</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;">of form (TYPE rr), and we get better error messages if we enforce that</span></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;">here (e.g. test gadt10).</span></span>
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1675
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<pre style="margin: 0;">+<span id="LC1675" class="line" lang="haskell"></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;">Note [Using TyVarTvs for kind-checking GADTs]</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;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1702
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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;">Consider</span></span>
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1703
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1679
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<pre style="margin: 0;"> <span id="LC1679" class="line" lang="haskell"></span>
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1704
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1680
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<pre style="margin: 0;"> <span id="LC1680" 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 +1684,27 @@ Consider</td>
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1708
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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;">It seems reasonable that this should be accepted. But something very strange</span></span>
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1709
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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;">is going on here: when we're kind-checking this declaration, we need to unify</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;">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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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;">MkProxy{1,2}.</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;">In effect, we are simply gathering constraints on the shape of Proxy's</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;">kind, with no skolemisation or implication constraints involved at all.</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;">The best approach we've come up with is to use TyVarTvs during 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;">kind-checking pass, rather than ordinary skolems. This is why we use</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;">the "_Tv" variant, bindOuterSigTKBndrs_Tv.</span></span>
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1695
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<pre style="margin: 0;">+<span id="LC1695" class="line" lang="haskell"></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;">Our only goal is to gather constraints on the kind of the type constructor;</span></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;">we do not certify that the data declaration is well-kinded. For example:</span></span>
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1715
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1698
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<pre style="margin: 0;"> <span id="LC1698" class="line" lang="haskell"></span>
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1716
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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 SameKind :: k -> k -> Type</span></span>
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1717
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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;"> data Bad a where</span></span>
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1718
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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;"> MkBad :: forall k1 k2 (a :: k1) (b :: k2). Bad (SameKind a b)</span></span>
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1719
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1702
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<pre style="margin: 0;"> <span id="LC1702" 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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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;">which would be accepted by kcConDecl because k1 and k2 are</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;">TyVarTvs. It is correctly rejected in the second pass, tcConDecl.</span></span>
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1705
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<pre style="margin: 0;">+<span id="LC1705" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(Test case: polykinds/TyVarTvKinds3)</span></span>
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1724
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1706
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<pre style="margin: 0;"> <span id="LC1706" 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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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;">The drawback of this approach is sometimes it will accept a definition that</span></span>
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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;">One drawback of this approach is sometimes it will accept a definition that</span></span>
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1731
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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;">a (hypothetical) declarative specification would likely reject. As a general</span></span>
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1732
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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;">rule, we don't want to allow polymorphic recursion without a CUSK. Indeed,</span></span>
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1733
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1710
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<pre style="margin: 0;"> <span id="LC1710" 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 +1723,23 @@ be rejected (without a CUSK). However, the accepted definitions are indeed</td>
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1746
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<pre style="margin: 0;"> <span id="LC1723" 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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<pre style="margin: 0;"> <span id="LC1724" 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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<pre style="margin: 0;"> <span id="LC1725" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1726" 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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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;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">+<span id="LC1728" 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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1729
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<pre style="margin: 0;">+<span id="LC1729" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">when kind checking.</span></span>
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<pre style="margin: 0;">+<span id="LC1730" class="line" lang="haskell"></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;">Consider:</span></span>
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1732
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<pre style="margin: 0;">+<span id="LC1732" 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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1733
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<pre style="margin: 0;">+<span id="LC1733" class="line" lang="haskell"></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;">When kind checking the `data T' declaration the local env contains the</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;">mappings:</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;"> T -> ATcTyCon <some initial kind></span></span>
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1737
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<pre style="margin: 0;">+<span id="LC1737" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> K -> APromotionErr</span></span>
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1738
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<pre style="margin: 0;">+<span id="LC1738" class="line" lang="haskell"></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;">APromotionErr is only used for DataCons, and only used during type checking</span></span>
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1740
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<pre style="margin: 0;">+<span id="LC1740" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in tcTyClGroup.</span></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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1742
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<pre style="margin: 0;">+<span id="LC1742" class="line" lang="haskell"></span>
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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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1750
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1744
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<pre style="margin: 0;"> <span id="LC1744" 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="LC1745" 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">@@ -2782,18 +2776,14 @@ tcDataDefn err_ctxt roles_info tc_name</td>
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2776
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<pre style="margin: 0;"> <span id="LC2776" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">isJust</span> <span class="n" style="color: #333;">mb_ksig</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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2783
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2777
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<pre style="margin: 0;"> <span id="LC2777" class="line" lang="haskell"> <span class="n" style="color: #333;">checkTc</span> <span class="p">(</span><span class="n" style="color: #333;">kind_signatures</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">badSigTyDecl</span> <span class="n" style="color: #333;">tc_name</span><span class="p">)</span></span>
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2784
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2778
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<pre style="margin: 0;"> <span id="LC2778" class="line" lang="haskell"></span>
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2785
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<pre style="margin: 0;">-<span id="LC2785" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tycon</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">fixM</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">tycon</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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2779
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<pre style="margin: 0;">+<span id="LC2779" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tycon</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">fixM</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;"><span class="idiff left right">rec_</span>tycon</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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2786
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2780
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<pre style="margin: 0;"> <span id="LC2780" class="line" lang="haskell"> <span class="p">{</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">final_bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tycon_binders</span> <span class="p">`</span><span class="n" style="color: #333;">chkAppend</span><span class="p">`</span> <span class="n" style="color: #333;">extra_bndrs</span></span>
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2787
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<pre style="margin: 0;">-<span id="LC2787" class="line" lang="haskell"> <span class="n" style="color: #333;">res_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">tycon</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyVarTys</span> <span class="p">(</span><span class="n" style="color: #333;">binderVars</span> <span class="n" style="color: #333;">final_bndrs</span><span class="p">))</span></span>
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2788
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<pre style="margin: 0;"> <span id="LC2781" class="line" lang="haskell"> <span class="n" style="color: #333;">roles</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">roles_info</span> <span class="n" style="color: #333;">tc_name</span></span>
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2789
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2782
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<pre style="margin: 0;"> <span id="LC2782" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">data_cons</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcConDecls</span></span>
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2790
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<pre style="margin: 0;">-<span id="LC2790" class="line" lang="haskell"> <span class="n" style="color: #333;">tycon</span></span>
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2791
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<pre style="margin: 0;">-<span id="LC2791" class="line" lang="haskell"> <span class="n" style="color: #333;">new_or_data</span></span>
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2792
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<pre style="margin: 0;">-<span id="LC2792" class="line" lang="haskell"> <span class="n" style="color: #333;">final_bndrs</span></span>
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2793
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<pre style="margin: 0;">-<span id="LC2793" class="line" lang="haskell"> <span class="n" style="color: #333;">final_res_kind</span></span>
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2794
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<pre style="margin: 0;">-<span id="LC2794" class="line" lang="haskell"> <span class="n" style="color: #333;">res_ty</span></span>
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2783
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<pre style="margin: 0;">+<span id="LC2783" class="line" lang="haskell"> <span class="n" style="color: #333;">new_or_data</span> <span class="kt" style="color: #458; font-weight: 600;">DDVanilla</span></span>
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2784
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<pre style="margin: 0;">+<span id="LC2784" class="line" lang="haskell"> <span class="n" style="color: #333;">rec_tycon</span> <span class="n" style="color: #333;">final_bndrs</span> <span class="n" style="color: #333;">final_res_kind</span></span>
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2795
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2785
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<pre style="margin: 0;"> <span id="LC2785" class="line" lang="haskell"> <span class="n" style="color: #333;">cons</span></span>
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2796
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<pre style="margin: 0;">-<span id="LC2796" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tc_rhs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mk_tc_rhs</span> <span class="n" style="color: #333;">hsc_src</span> <span class="n" style="color: #333;">tycon</span> <span class="n" style="color: #333;">data_cons</span></span>
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<pre style="margin: 0;">+<span id="LC2786" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tc_rhs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mk_tc_rhs</span> <span class="n" style="color: #333;">hsc_src</span> <span class="n" style="color: #333;"><span class="idiff left right">rec_</span>tycon</span> <span class="n" style="color: #333;">data_cons</span></span>
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2797
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2787
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<pre style="margin: 0;"> <span id="LC2787" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tc_rep_nm</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newTyConRepName</span> <span class="n" style="color: #333;">tc_name</span></span>
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2798
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2788
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<pre style="margin: 0;"> <span id="LC2788" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkAlgTyCon</span> <span class="n" style="color: #333;">tc_name</span></span>
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2799
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2789
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<pre style="margin: 0;"> <span id="LC2789" class="line" lang="haskell"> <span class="n" style="color: #333;">final_bndrs</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="3195" 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="3185" 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">@@ -3195,36 +3185,51 @@ consUseGadtSyntax _ = False</td>
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3195
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3185
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<pre style="margin: 0;"> <span id="LC3185" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- All constructors have same shape</span></span>
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3186
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<pre style="margin: 0;"> <span id="LC3186" class="line" lang="haskell"></span>
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3197
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3187
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<pre style="margin: 0;"> <span id="LC3187" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-----------------------------------</span></span>
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3198
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<pre style="margin: 0;">-<span id="LC3198" class="line" lang="haskell"><span class="n" style="color: #333;">tcConDecls</span> <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;">TyCon</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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3199
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<pre style="margin: 0;">-<span id="LC3199" 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;">TyConBinder</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcKind</span> <span class="c1" style="color: #998; font-style: italic;">-- binders and result kind of tycon</span></span>
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3200
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<pre style="margin: 0;">-<span id="LC3200" 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="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="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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3201
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<pre style="margin: 0;">-<span id="LC3201" class="line" lang="haskell"><span class="n" style="color: #333;">tcConDecls</span> <span class="n" style="color: #333;">rep_tycon</span> <span class="n" style="color: #333;">new_or_data</span> <span class="n" style="color: #333;">tmpl_bndrs</span> <span class="n" style="color: #333;">res_kind</span> <span class="n" style="color: #333;">res_tmpl</span></span>
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3188
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<pre style="margin: 0;">+<span id="LC3188" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">DataDeclInfo</span></span>
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3189
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<pre style="margin: 0;">+<span id="LC3189" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">DDVanilla</span> <span class="c1" style="color: #998; font-style: italic;">-- data T a b = T1 a | T2 b</span></span>
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3190
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<pre style="margin: 0;">+<span id="LC3190" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">DDInstance</span> <span class="c1" style="color: #998; font-style: italic;">-- data instance D [a] = D1 a | D2</span></span>
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3191
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<pre style="margin: 0;">+<span id="LC3191" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="c1" style="color: #998; font-style: italic;">-- The header D [a]</span></span>
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3192
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<pre style="margin: 0;">+<span id="LC3192" class="line" lang="haskell"></span>
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3193
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<pre style="margin: 0;">+<span id="LC3193" class="line" lang="haskell"><span class="n" style="color: #333;">mkDDHeaderTy</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DataDeclInfo</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyConBinder</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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3194
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<pre style="margin: 0;">+<span id="LC3194" class="line" lang="haskell"><span class="n" style="color: #333;">mkDDHeaderTy</span> <span class="n" style="color: #333;">dd_info</span> <span class="n" style="color: #333;">rep_tycon</span> <span class="n" style="color: #333;">tc_bndrs</span></span>
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3195
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<pre style="margin: 0;">+<span id="LC3195" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">dd_info</span> <span class="kr" style="font-weight: 600;">of</span></span>
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3196
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<pre style="margin: 0;">+<span id="LC3196" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DDVanilla</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">rep_tycon</span> <span class="o" style="font-weight: 600;">$</span></span>
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3197
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<pre style="margin: 0;">+<span id="LC3197" class="line" lang="haskell"> <span class="n" style="color: #333;">mkTyVarTys</span> <span class="p">(</span><span class="n" style="color: #333;">binderVars</span> <span class="n" style="color: #333;">tc_bndrs</span><span class="p">)</span></span>
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3198
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<pre style="margin: 0;">+<span id="LC3198" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DDInstance</span> <span class="n" style="color: #333;">header_ty</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">header_ty</span></span>
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3199
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<pre style="margin: 0;">+<span id="LC3199" class="line" lang="haskell"></span>
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3200
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<pre style="margin: 0;">+<span id="LC3200" class="line" lang="haskell"><span class="n" style="color: #333;">tcConDecls</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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3201
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<pre style="margin: 0;">+<span id="LC3201" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DataDeclInfo</span></span>
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3202
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<pre style="margin: 0;">+<span id="LC3202" 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;">TyCon</span> <span class="c1" style="color: #998; font-style: italic;">-- Representation TyCon</span></span>
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3203
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<pre style="margin: 0;">+<span id="LC3203" 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;">TyConBinder</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- Binders of representation TyCon</span></span>
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3204
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<pre style="margin: 0;">+<span id="LC3204" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcKind</span> <span class="c1" style="color: #998; font-style: italic;">-- Result kind</span></span>
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3205
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<pre style="margin: 0;">+<span id="LC3205" 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="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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3206
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<pre style="margin: 0;">+<span id="LC3206" class="line" lang="haskell"><span class="n" style="color: #333;">tcConDecls</span> <span class="n" style="color: #333;">new_or_data</span> <span class="n" style="color: #333;">dd_info</span> <span class="n" style="color: #333;">rep_tycon</span> <span class="n" style="color: #333;">tmpl_bndrs</span> <span class="n" style="color: #333;">res_kind</span></span>
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3202
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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="n" style="color: #333;">concatMapM</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">addLocM</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC3203" class="line" lang="haskell"> <span class="n" style="color: #333;">tcConDecl</span> <span class="n" style="color: #333;">rep_tycon</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyConTagMap</span> <span class="n" style="color: #333;">rep_tycon</span><span class="p">)</span></span>
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3204
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<pre style="margin: 0;">-<span id="LC3204" class="line" lang="haskell"> <span class="n" style="color: #333;">tmpl_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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3205
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<pre style="margin: 0;">-<span id="LC3205" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- It's important that we pay for tag allocation here, once per TyCon,</span></span>
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3206
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<pre style="margin: 0;">-<span id="LC3206" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Constructor tag allocation], fixes #14657</span></span>
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3207
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<pre style="margin: 0;">-<span id="LC3207" class="line" lang="haskell"></span>
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3208
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<pre style="margin: 0;">-<span id="LC3208" class="line" lang="haskell"><span class="n" style="color: #333;">tcConDecl</span> <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;">TyCon</span> <span class="c1" style="color: #998; font-style: italic;">-- Representation tycon. Knot-tied!</span></span>
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<pre style="margin: 0;">+<span id="LC3208" class="line" lang="haskell"> <span class="n" style="color: #333;">tcConDecl</span> <span class="n" style="color: #333;">new_or_data</span> <span class="n" style="color: #333;">dd_info</span> <span class="n" style="color: #333;">rep_tycon</span> <span class="n" style="color: #333;">tmpl_bndrs</span> <span class="n" style="color: #333;">res_kind</span></span>
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3209
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<pre style="margin: 0;">+<span id="LC3209" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mkTyConTagMap</span> <span class="n" style="color: #333;">rep_tycon</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC3210" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- mkTyConTagMap: it's important that we pay for tag allocation here,</span></span>
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<pre style="margin: 0;">+<span id="LC3211" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- once per TyCon. See Note [Constructor tag allocation], fixes #14657</span></span>
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<pre style="margin: 0;">+<span id="LC3212" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3213" class="line" lang="haskell"><span class="n" style="color: #333;">tcConDecl</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="LC3214" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DataDeclInfo</span></span>
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3215
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<pre style="margin: 0;">+<span id="LC3215" 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;">TyCon</span> <span class="c1" style="color: #998; font-style: italic;">-- Representation tycon. Knot-tied!</span></span>
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3216
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<pre style="margin: 0;">+<span id="LC3216" 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;">TyConBinder</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- Binders of representation TyCon</span></span>
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<pre style="margin: 0;">+<span id="LC3217" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcKind</span> <span class="c1" style="color: #998; font-style: italic;">-- Result kind</span></span>
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3209
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<pre style="margin: 0;"> <span id="LC3218" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">NameEnv</span> <span class="kt" style="color: #458; font-weight: 600;">ConTag</span></span>
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3210
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<pre style="margin: 0;">-<span id="LC3210" 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;">TyConBinder</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcKind</span> <span class="c1" style="color: #998; font-style: italic;">-- tycon binders and result kind</span></span>
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3211
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<pre style="margin: 0;">-<span id="LC3211" 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>
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3212
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<pre style="margin: 0;">-<span id="LC3212" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Return type template (T tys), where T is the family TyCon</span></span>
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3213
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<pre style="margin: 0;">-<span id="LC3213" 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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3214
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<pre style="margin: 0;"> <span id="LC3219" 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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3220
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<pre style="margin: 0;"> <span id="LC3220" 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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3221
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<pre style="margin: 0;"> <span id="LC3221" class="line" lang="haskell"></span>
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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;"><span class="idiff left">rep_tycon</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tag_map</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tmpl_bndrs</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">res_tmpl</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">new_or_data</span></span></span>
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3222
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<pre style="margin: 0;">+<span id="LC3222" class="line" lang="haskell"><span class="n" style="color: #333;">tcConDecl</span> <span class="n" style="color: #333;"><span class="idiff left">new_or_data</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">dd_info</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rep_tycon</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tc_bndrs</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">tag_map</span></span></span>
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3218
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3223
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<pre style="margin: 0;"> <span id="LC3223" 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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3224
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<pre style="margin: 0;"> <span id="LC3224" 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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3225
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<pre style="margin: 0;"> <span id="LC3225" 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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3221
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3226
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<pre style="margin: 0;"> <span id="LC3226" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">con_args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_args</span> <span class="p">})</span></span>
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3222
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<pre style="margin: 0;">-<span id="LC3222" 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;">dataConCtxt<span class="idiff left right">Name</span></span> <span class="p">[</span><span class="n" style="color: #333;">lname</span><span class="p">])</span> <span class="o" style="font-weight: 600;">$</span></span>
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3227
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<pre style="margin: 0;">+<span id="LC3227" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addErrCtxt</span> <span class="p">(</span><span class="n" style="color: #333;">dataConCtxt</span> <span class="p">[</span><span class="n" style="color: #333;">lname</span><span class="p">])</span> <span class="o" style="font-weight: 600;">$</span></span>
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3223
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3228
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<pre style="margin: 0;"> <span id="LC3228" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="c1" style="color: #998; font-style: italic;">-- NB: the tyvars from the declaration header are in scope</span></span>
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3229
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<pre style="margin: 0;"> <span id="LC3229" class="line" lang="haskell"></span>
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3225
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3230
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<pre style="margin: 0;"> <span id="LC3230" 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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3231
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<pre style="margin: 0;"> <span id="LC3231" 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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3232
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<pre style="margin: 0;">+<span id="LC3232" 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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3233
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<pre style="margin: 0;"> <span id="LC3233" 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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3234
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<pre style="margin: 0;"> <span id="LC3234" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- , hsq_explicit = {f,b} }</span></span>
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3235
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<pre style="margin: 0;"> <span id="LC3235" 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">@@ -3242,29 +3247,35 @@ tcConDecl rep_tycon tag_map tmpl_bndrs res_kind res_tmpl new_or_data</td>
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3242
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3247
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<pre style="margin: 0;"> <span id="LC3247" class="line" lang="haskell"> <span class="p">}</span></span>
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3248
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<pre style="margin: 0;"> <span id="LC3248" class="line" lang="haskell"></span>
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3249
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<pre style="margin: 0;"> <span id="LC3249" class="line" lang="haskell"></span>
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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;">$</span></span>
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3250
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<pre style="margin: 0;">+<span id="LC3250" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">t<span class="idiff left">c_tvs</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">binderVars</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">tc</span>_bndrs</span></span>
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3251
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<pre style="margin: 0;">+<span id="LC3251" class="line" lang="haskell"> <span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff">fake_ty</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">mkSpecForAllTys</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tc_tvs</span></span><span class="idiff right"> </span> <span class="o" style="font-weight: 600;">$</span></span>
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3247
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3252
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<pre style="margin: 0;"> <span id="LC3252" 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;">$</span></span>
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3248
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3253
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<pre style="margin: 0;"> <span id="LC3253" class="line" lang="haskell"> <span class="n" style="color: #333;">mkPhiTy</span> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;">$</span></span>
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3249
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3254
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<pre style="margin: 0;"> <span id="LC3254" 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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3255
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<pre style="margin: 0;"> <span id="LC3255" class="line" lang="haskell"> <span class="n" style="color: #333;">unitTy</span></span>
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3251
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3256
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<pre style="margin: 0;"> <span id="LC3256" 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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3257
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<pre style="margin: 0;"> <span id="LC3257" 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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<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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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;">-- 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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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;">-- and so it just creates more work to do it right. Really,</span></span>
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3255
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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;">-- we're only doing this to find the right kind variables to</span></span>
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3256
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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;">-- quantify over, and this type is fine for that purpose.</span></span>
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3262
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<pre style="margin: 0;"> <span id="LC3262" 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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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;">-- 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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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;">-- the kvs below are those kind variables entirely unmentioned by the user</span></span>
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3260
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3265
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<pre style="margin: 0;"> <span id="LC3265" 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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3266
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<pre style="margin: 0;"> <span id="LC3266" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3267" 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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3268
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<pre style="margin: 0;"> <span id="LC3268" 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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3269
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<pre style="margin: 0;">+<span id="LC3269" 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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3270
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<pre style="margin: 0;"> <span id="LC3270" 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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3271
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<pre style="margin: 0;">+<span id="LC3271" 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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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;">-- by the data constructor decl, whereas actually the</span></span>
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<pre style="margin: 0;">+<span id="LC3273" 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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3274
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<pre style="margin: 0;">+<span id="LC3274" 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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<pre style="margin: 0;">+<span id="LC3275" 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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<pre style="margin: 0;">+<span id="LC3276" 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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<pre style="margin: 0;">+<span id="LC3277" class="line" lang="haskell"></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;">-- Zonk to Types</span></span>
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3268
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3279
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<pre style="margin: 0;"> <span id="LC3279" 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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3280
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<pre style="margin: 0;"> <span id="LC3280" 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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3281
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<pre style="margin: 0;"> <span id="LC3281" 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 +3283,14 @@ tcConDecl rep_tycon tag_map tmpl_bndrs res_kind res_tmpl new_or_data</td>
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3272
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3283
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<pre style="margin: 0;"> <span id="LC3283" class="line" lang="haskell"></span>
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3273
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3284
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<pre style="margin: 0;"> <span id="LC3284" 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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3285
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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;">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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<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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3278
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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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3279
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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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3280
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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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3281
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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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3282
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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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3283
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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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3286
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<pre style="margin: 0;">+<span id="LC3286" 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="LC3287" 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="LC3288" 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="LC3289" 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="LC3290" 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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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;">-- See Note [DataCon user type variable binders] in GHC.Core.DataCon.</span></span>
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3292
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<pre style="margin: 0;">+<span id="LC3292" 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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3293
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<pre style="margin: 0;">+<span id="LC3293" class="line" lang="haskell"> <span class="n" style="color: #333;">user_res_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkDDHeaderTy</span> <span class="n" style="color: #333;">dd_info</span> <span class="n" style="color: #333;">rep_tycon</span> <span class="n" style="color: #333;">tc_bndrs</span></span>
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3284
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3294
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<pre style="margin: 0;"> <span id="LC3294" class="line" lang="haskell"></span>
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3285
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3295
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<pre style="margin: 0;"> <span id="LC3295" 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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3286
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3296
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<pre style="margin: 0;"> <span id="LC3296" 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="diff-line-num unfold js-unfold old_line" data-linenumber="3288" 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="3298" 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">@@ -3288,9 +3298,9 @@ 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="LC3298" 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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3289
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3299
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<pre style="margin: 0;"> <span id="LC3299" 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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3300
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<pre style="margin: 0;"> <span id="LC3300" 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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3291
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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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3301
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<pre style="margin: 0;">+<span id="LC3301" 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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3302
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<pre style="margin: 0;"> <span id="LC3302" 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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<pre style="margin: 0;">-<span id="LC3293" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left right">res_tmpl</span></span> <span class="n" style="color: #333;">rep_tycon</span> <span class="n" style="color: #333;">tag_map</span></span>
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3303
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<pre style="margin: 0;">+<span id="LC3303" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left right">user_res_ty</span></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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3304
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<pre style="margin: 0;"> <span id="LC3304" 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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3295
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3305
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<pre style="margin: 0;"> <span id="LC3305" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- constructor type signature into the data constructor;</span></span>
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3296
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3306
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<pre style="margin: 0;"> <span id="LC3306" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- that way checkValidDataCon can complain if it's wrong.</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">@@ -3299,14 +3309,14 @@ 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="LC3309" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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3300
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3310
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<pre style="margin: 0;"> <span id="LC3310" 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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3311
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<pre style="margin: 0;"> <span id="LC3311" 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;"><span class="idiff left">rep_tycon</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tag_map</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tmpl_bndrs</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">res_tmpl</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">new_or_data</span></span></span>
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3312
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<pre style="margin: 0;">+<span id="LC3312" class="line" lang="haskell"><span class="n" style="color: #333;">tcConDecl</span> <span class="n" style="color: #333;"><span class="idiff left">new_or_data</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">dd_info</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rep_tycon</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tc_bndrs</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">tag_map</span></span></span>
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3303
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3313
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<pre style="margin: 0;"> <span id="LC3313" 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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3304
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3314
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<pre style="margin: 0;"> <span id="LC3314" 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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3315
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<pre style="margin: 0;"> <span id="LC3315" 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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3306
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3316
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<pre style="margin: 0;"> <span id="LC3316" class="line" lang="haskell"> <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_hs_bndrs</span></span>
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3307
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3317
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<pre style="margin: 0;"> <span id="LC3317" 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;">cxt</span><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;">hs_args</span></span>
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3308
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3318
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<pre style="margin: 0;"> <span id="LC3318" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">con_res_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_res_ty</span> <span class="p">})</span></span>
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3309
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<pre style="margin: 0;">-<span id="LC3309" 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;">dataConCtxt<span class="idiff left right">Name</span></span> <span class="n" style="color: #333;">names</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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3319
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<pre style="margin: 0;">+<span id="LC3319" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addErrCtxt</span> <span class="p">(</span><span class="n" style="color: #333;">dataConCtxt</span> <span class="n" style="color: #333;">names</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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3310
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3320
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<pre style="margin: 0;"> <span id="LC3320" 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;">"tcConDecl 1 gadt"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">names</span><span class="p">)</span></span>
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3311
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3321
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<pre style="margin: 0;"> <span id="LC3321" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</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="o" style="font-weight: 600;">:</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">names</span></span>
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3312
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3322
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<pre style="margin: 0;"> <span id="LC3322" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="3317" 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="3327" 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">@@ -3317,10 +3327,23 @@ tcConDecl rep_tycon tag_map tmpl_bndrs _res_kind res_tmpl new_or_data</td>
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3317
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3327
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<pre style="margin: 0;"> <span id="LC3327" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">res_ty</span><span class="p">,</span> <span class="n" style="color: #333;">res_kind</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInferLHsTypeKind</span> <span class="n" style="color: #333;">hs_res_ty</span></span>
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3318
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3328
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<pre style="margin: 0;"> <span id="LC3328" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [GADT return kinds]</span></span>
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3319
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3329
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<pre style="margin: 0;"> <span id="LC3329" class="line" lang="haskell"></span>
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3330
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<pre style="margin: 0;">+<span id="LC3330" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- For data instances (only), ensure that the return type,</span></span>
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3331
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<pre style="margin: 0;">+<span id="LC3331" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- res_ty, is a substitution instance of the header.</span></span>
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3332
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<pre style="margin: 0;">+<span id="LC3332" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [GADT return types]</span></span>
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3333
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<pre style="margin: 0;">+<span id="LC3333" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">dd_info</span> <span class="kr" style="font-weight: 600;">of</span></span>
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3334
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<pre style="margin: 0;">+<span id="LC3334" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DDVanilla</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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3335
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<pre style="margin: 0;">+<span id="LC3335" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DDInstance</span> <span class="n" style="color: #333;">hdr_ty</span> <span class="o" style="font-weight: 600;">-></span></span>
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3336
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<pre style="margin: 0;">+<span id="LC3336" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">subst</span><span class="p">,</span> <span class="n" style="color: #333;">_meta_tvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newMetaTyVars</span> <span class="p">(</span><span class="n" style="color: #333;">binderVars</span> <span class="n" style="color: #333;">tc_bndrs</span><span class="p">)</span></span>
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3337
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<pre style="margin: 0;">+<span id="LC3337" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">head_shape</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substTy</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">hdr_ty</span></span>
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3338
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<pre style="margin: 0;">+<span id="LC3338" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">discardResult</span> <span class="o" style="font-weight: 600;">$</span></span>
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3339
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<pre style="margin: 0;">+<span id="LC3339" class="line" lang="haskell"> <span class="n" style="color: #333;">popErrCtxt</span> <span class="o" style="font-weight: 600;">$</span> <span class="c1" style="color: #998; font-style: italic;">-- Drop dataConCtxt</span></span>
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3340
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<pre style="margin: 0;">+<span id="LC3340" class="line" lang="haskell"> <span class="n" style="color: #333;">addErrCtxt</span> <span class="p">(</span><span class="n" style="color: #333;">dataConResCtxt</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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3341
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<pre style="margin: 0;">+<span id="LC3341" class="line" lang="haskell"> <span class="n" style="color: #333;">unifyType</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="n" style="color: #333;">res_ty</span> <span class="n" style="color: #333;">head_shape</span> <span class="p">}</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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3320
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3343
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<pre style="margin: 0;"> <span id="LC3343" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Datatype return kinds]</span></span>
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3321
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3344
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<pre style="margin: 0;"> <span id="LC3344" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">exp_kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">getArgExpKind</span> <span class="n" style="color: #333;">new_or_data</span> <span class="n" style="color: #333;">res_kind</span></span>
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3322
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<pre style="margin: 0;">-<span id="LC3322" class="line" lang="haskell"></span>
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3323
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3345
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<pre style="margin: 0;"> <span id="LC3345" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">btys</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcConGADTArgs</span> <span class="n" style="color: #333;">exp_kind</span> <span class="n" style="color: #333;">hs_args</span></span>
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3346
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<pre style="margin: 0;">+<span id="LC3346" class="line" lang="haskell"></span>
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3324
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3347
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<pre style="margin: 0;"> <span id="LC3347" 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;">arg_tys</span><span class="p">,</span> <span class="n" style="color: #333;">stricts</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unzip</span> <span class="n" style="color: #333;">btys</span></span>
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3325
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3348
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<pre style="margin: 0;"> <span id="LC3348" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">field_lbls</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupConstructorFields</span> <span class="n" style="color: #333;">name</span></span>
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3326
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3349
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<pre style="margin: 0;"> <span id="LC3349" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">ctxt</span><span class="p">,</span> <span class="n" style="color: #333;">arg_tys</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">,</span> <span class="n" style="color: #333;">field_lbls</span><span class="p">,</span> <span class="n" style="color: #333;">stricts</span><span class="p">)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -3343,9 +3366,10 @@ tcConDecl rep_tycon tag_map tmpl_bndrs _res_kind res_tmpl new_or_data</td>
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3343
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3366
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<pre style="margin: 0;"> <span id="LC3366" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkTcTypesToTypesX</span> <span class="n" style="color: #333;">ze</span> <span class="n" style="color: #333;">ctxt</span></span>
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3344
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3367
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<pre style="margin: 0;"> <span id="LC3367" 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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3368
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<pre style="margin: 0;"> <span id="LC3368" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC3346" 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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3347
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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;">tmpl_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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3348
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<pre style="margin: 0;">-<span id="LC3348" 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="LC3369" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">res_tmpl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkDDHeaderTy</span> <span class="n" style="color: #333;">dd_info</span> <span class="n" style="color: #333;">rep_tycon</span> <span class="n" style="color: #333;">tc_bndrs</span></span>
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<pre style="margin: 0;">+<span id="LC3370" class="line" lang="haskell"> <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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3371
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<pre style="margin: 0;">+<span id="LC3371" 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;">tc_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="LC3372" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [rejigConRes]</span></span>
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<pre style="margin: 0;"> <span id="LC3373" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3374" 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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3351
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3375
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<pre style="margin: 0;"> <span id="LC3375" class="line" lang="haskell"> <span class="n" style="color: #333;">arg_tys'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substScaledTys</span> <span class="n" style="color: #333;">arg_subst</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">@@ -3372,8 +3396,65 @@ tcConDecl rep_tycon tag_map tmpl_bndrs _res_kind res_tmpl new_or_data</td>
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3372
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3396
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<pre style="margin: 0;"> <span id="LC3396" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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3373
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3397
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<pre style="margin: 0;"> <span id="LC3397" 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="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="p">(</span><span class="n" style="color: #333;">head</span> <span class="n" style="color: #333;">names</span><span class="p">))</span></span>
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3374
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3398
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<pre style="margin: 0;"> <span id="LC3398" class="line" lang="haskell"></span>
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3375
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<pre style="margin: 0;">-<span id="LC3375" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [GADT return <span class="idiff left right">kind</span>s]</span></span>
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3399
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<pre style="margin: 0;">+<span id="LC3399" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [GADT return <span class="idiff left right">type</span>s]</span></span>
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3376
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3400
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<pre style="margin: 0;"> <span id="LC3400" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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3401
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<pre style="margin: 0;">+<span id="LC3401" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider</span></span>
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<pre style="margin: 0;">+<span id="LC3402" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data family T :: forall k. k -> Type</span></span>
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3403
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<pre style="margin: 0;">+<span id="LC3403" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data instance T (a :: Type) where</span></span>
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<pre style="margin: 0;">+<span id="LC3404" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkT :: forall b. T b</span></span>
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3405
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<pre style="margin: 0;">+<span id="LC3405" class="line" lang="haskell"></span>
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3406
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<pre style="margin: 0;">+<span id="LC3406" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">What kind does `b` have in the signature for MkT?</span></span>
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<pre style="margin: 0;">+<span id="LC3407" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Since the return type must be an instance of the type in the header,</span></span>
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3408
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<pre style="margin: 0;">+<span id="LC3408" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we must have (b :: Type), but you can't tell that by looking only at</span></span>
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<pre style="margin: 0;">+<span id="LC3409" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the type of the data constructor; you have to look at the header too.</span></span>
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<pre style="margin: 0;">+<span id="LC3410" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If you wrote it out fully, it'd look like</span></span>
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<pre style="margin: 0;">+<span id="LC3411" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data instance T @Type (a :: Type) where</span></span>
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3412
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<pre style="margin: 0;">+<span id="LC3412" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkT :: forall (b::Type). T @Type b</span></span>
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3413
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<pre style="margin: 0;">+<span id="LC3413" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3414" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We could reject the program, and expect the user to add kind</span></span>
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3415
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<pre style="margin: 0;">+<span id="LC3415" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">annotations to `MkT` to restrict the signature. But an easy, and</span></span>
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3416
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<pre style="margin: 0;">+<span id="LC3416" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">helpful alternative is this: simply instantiate the type from the</span></span>
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3417
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<pre style="margin: 0;">+<span id="LC3417" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">header with fresh unification variables, and unify with the return</span></span>
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3418
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<pre style="margin: 0;">+<span id="LC3418" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">type of `MkT`. That will force `b` to have kind `Type`. See #8707</span></span>
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3419
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<pre style="margin: 0;">+<span id="LC3419" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and #14111.</span></span>
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3420
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<pre style="margin: 0;">+<span id="LC3420" class="line" lang="haskell"></span>
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3421
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<pre style="margin: 0;">+<span id="LC3421" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Wrikles</span></span>
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3422
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<pre style="margin: 0;">+<span id="LC3422" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* At first sight it looks as though this would completely subsume the</span></span>
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3423
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<pre style="margin: 0;">+<span id="LC3423" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> return-type check in checkValidDataCon. But it does not. Suppose we</span></span>
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3424
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<pre style="margin: 0;">+<span id="LC3424" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> have</span></span>
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3425
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<pre style="margin: 0;">+<span id="LC3425" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data instance T [a] where</span></span>
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3426
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<pre style="margin: 0;">+<span id="LC3426" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkT :: T (F (Maybe a))</span></span>
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3427
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<pre style="margin: 0;">+<span id="LC3427" class="line" lang="haskell"></span>
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3428
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<pre style="margin: 0;">+<span id="LC3428" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> where F is a type function. Then maybe (F (Maybe a)) evaluates to</span></span>
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3429
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<pre style="margin: 0;">+<span id="LC3429" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [a], so unifyType will succeed. But we discard the coercion</span></span>
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3430
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<pre style="margin: 0;">+<span id="LC3430" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> returned by unifyType; and we really don't want to accept this</span></span>
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3431
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<pre style="margin: 0;">+<span id="LC3431" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> program. The check in checkValidDataCon will, however, reject it.</span></span>
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3432
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<pre style="margin: 0;">+<span id="LC3432" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> TL;DR: keep the check in checkValidDataCon.</span></span>
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3433
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<pre style="margin: 0;">+<span id="LC3433" class="line" lang="haskell"></span>
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3434
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<pre style="margin: 0;">+<span id="LC3434" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Consider a data type, rather than a data instance, declaration</span></span>
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3435
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<pre style="margin: 0;">+<span id="LC3435" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data S a where { MkS :: b -> S [b] }</span></span>
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3436
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<pre style="margin: 0;">+<span id="LC3436" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> In tcConDecl, S is knot-tied, so we don't want to unify (S alpha)</span></span>
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3437
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<pre style="margin: 0;">+<span id="LC3437" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> with (S [b]). To put it another way, unifyType should never see a</span></span>
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3438
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<pre style="margin: 0;">+<span id="LC3438" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> TcTycon. Simple solution: do *not* do the extra unifyType for</span></span>
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<pre style="margin: 0;">+<span id="LC3439" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data types (DDVanilla) only for data instances (DDInstance); in</span></span>
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<pre style="margin: 0;">+<span id="LC3440" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the latter the family constructor is not knot-tied so there is no</span></span>
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3441
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<pre style="margin: 0;">+<span id="LC3441" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> problem.</span></span>
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<pre style="margin: 0;">+<span id="LC3442" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3443" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Consider this (fromn GHC itself):</span></span>
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<pre style="margin: 0;">+<span id="LC3444" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3445" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data Pass = Parsed | ...</span></span>
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<pre style="margin: 0;">+<span id="LC3446" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data GhcPass (c :: Pass) where</span></span>
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<pre style="margin: 0;">+<span id="LC3447" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> GhcPs :: GhcPs</span></span>
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<pre style="margin: 0;">+<span id="LC3448" 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="LC3449" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type GhcPs = GhcPass 'Parsed</span></span>
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<pre style="margin: 0;">+<span id="LC3450" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3451" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Now GhcPs and GhcPass are mutually recursive. If we did unifyType</span></span>
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<pre style="margin: 0;">+<span id="LC3452" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> for datatypes like GhcPass, we would not be able to exand the type</span></span>
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<pre style="margin: 0;">+<span id="LC3453" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> synonym (it'd still be a TcTyCon). So again, we don't do uinfyType</span></span>
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<pre style="margin: 0;">+<span id="LC3454" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> for data types; we leave it to checkValidDataCon.</span></span>
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3455
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<pre style="margin: 0;">+<span id="LC3455" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3456" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [GADT return kinds]</span></span>
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3457
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<pre style="margin: 0;">+<span id="LC3457" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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3377
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3458
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<pre style="margin: 0;"> <span id="LC3458" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider</span></span>
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3459
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<pre style="margin: 0;"> <span id="LC3459" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type family Star where Star = Type</span></span>
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3379
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3460
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<pre style="margin: 0;"> <span id="LC3460" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T :: Type 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">@@ -3496,8 +3577,8 @@ For example:</td>
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<pre style="margin: 0;"> <span id="LC3577" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (:--:) :: t1 -> t2 -> T Int</span></span>
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<pre style="margin: 0;"> <span id="LC3578" class="line" lang="haskell"></span>
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3498
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3579
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<pre style="margin: 0;"> <span id="LC3579" class="line" lang="haskell"></span>
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3499
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<pre style="margin: 0;">-<span id="LC3499" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [<span class="idiff left right">Checking GADT return typ</span>es]</span></span>
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<pre style="margin: 0;">-<span id="LC3500" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~<span class="idiff left right">~~~~~~~~~~~~~~~</span></span></span>
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3580
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<pre style="margin: 0;">+<span id="LC3580" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [<span class="idiff left right">rejigConR</span>es]</span></span>
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3581
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<pre style="margin: 0;">+<span id="LC3581" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~</span></span>
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3501
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3582
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<pre style="margin: 0;"> <span id="LC3582" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">There is a delicacy around checking the return types of a datacon. The</span></span>
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3502
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3583
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<pre style="margin: 0;"> <span id="LC3583" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">central problem is dealing with a declaration like</span></span>
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3503
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3584
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<pre style="margin: 0;"> <span id="LC3584" 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">@@ -3532,9 +3613,9 @@ errors reported in one pass. See #7175, and #10836.</td>
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3532
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3613
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<pre style="margin: 0;"> <span id="LC3613" 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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3533
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3614
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<pre style="margin: 0;"> <span id="LC3614" 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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3615
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<pre style="margin: 0;"> <span id="LC3615" 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="LC3616" 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="LC3617" 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="LC3618" 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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3538
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3619
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<pre style="margin: 0;"> <span id="LC3619" 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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3620
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<pre style="margin: 0;"> <span id="LC3620" 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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3540
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3621
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<pre style="margin: 0;"> <span id="LC3621" 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="diff-line-num unfold js-unfold new_line" data-linenumber="3627" 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">@@ -3546,10 +3627,10 @@ rejigConRes :: [KnotTied TyConBinder] -> KnotTied Type -- Template for result</td>
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3546
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3627
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<pre style="margin: 0;"> <span id="LC3627" 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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3547
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3628
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<pre style="margin: 0;"> <span id="LC3628" 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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3548
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3629
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<pre style="margin: 0;"> <span id="LC3629" 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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3549
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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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3630
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<pre style="margin: 0;">+<span id="LC3630" 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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3550
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3631
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<pre style="margin: 0;"> <span id="LC3631" 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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3551
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3632
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<pre style="margin: 0;"> <span id="LC3632" 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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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;">-- 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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3633
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<pre style="margin: 0;">+<span id="LC3633" 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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3553
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3634
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<pre style="margin: 0;"> <span id="LC3634" 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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3635
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<pre style="margin: 0;"> <span id="LC3635" 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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3636
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<pre style="margin: 0;"> <span id="LC3636" 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="diff-line-num unfold js-unfold new_line" data-linenumber="3645" 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">@@ -3564,7 +3645,7 @@ rejigConRes tmpl_bndrs res_tmpl dc_tvbndrs res_ty</td>
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3564
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3645
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<pre style="margin: 0;"> <span id="LC3645" 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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3646
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<pre style="margin: 0;"> <span id="LC3646" 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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3647
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<pre style="margin: 0;"> <span id="LC3647" 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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3648
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<pre style="margin: 0;">+<span id="LC3648" 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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3568
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3649
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<pre style="margin: 0;"> <span id="LC3649" 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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3650
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<pre style="margin: 0;"> <span id="LC3650" 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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3651
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<pre style="margin: 0;"> <span id="LC3651" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="3671" 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">@@ -3590,11 +3671,11 @@ rejigConRes tmpl_bndrs res_tmpl dc_tvbndrs res_ty</td>
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3590
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3671
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<pre style="margin: 0;"> <span id="LC3671" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we must do *something*, not just crash. So we do something simple</span></span>
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3591
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3672
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<pre style="margin: 0;"> <span id="LC3672" 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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3673
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<pre style="margin: 0;"> <span id="LC3673" 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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<pre style="margin: 0;">-<span id="LC3593" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">Checking GADT return typ</span>es]</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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3674
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<pre style="margin: 0;">+<span id="LC3674" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">rejigConR</span>es]</span></span>
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3675
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<pre style="margin: 0;">+<span id="LC3675" 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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3595
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3676
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<pre style="margin: 0;"> <span id="LC3676" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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3596
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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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3597
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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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3677
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<pre style="margin: 0;">+<span id="LC3677" 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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3678
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<pre style="margin: 0;">+<span id="LC3678" 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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3598
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3679
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<pre style="margin: 0;"> <span id="LC3679" class="line" lang="haskell"></span>
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3599
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3680
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<pre style="margin: 0;"> <span id="LC3680" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [mkGADTVars]</span></span>
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3600
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3681
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<pre style="margin: 0;"> <span id="LC3681" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~</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">@@ -3634,7 +3715,7 @@ becomes</td>
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3634
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3715
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<pre style="margin: 0;"> <span id="LC3715" class="line" lang="haskell"></span>
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3635
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3716
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<pre style="margin: 0;"> <span id="LC3716" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We start off by matching (T k1 k2 a b) with (T x1 * (Proxy x1 y, z) z). We</span></span>
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3636
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3717
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<pre style="margin: 0;"> <span id="LC3717" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">know this match will succeed because of the validity check (actually done</span></span>
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3637
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<pre style="margin: 0;">-<span id="LC3637" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">later, but laziness saves us -- see Note [<span class="idiff left right">Checking GADT return typ</span>es]).</span></span>
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3718
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<pre style="margin: 0;">+<span id="LC3718" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">later, but laziness saves us -- see Note [<span class="idiff left right">rejigConR</span>es]).</span></span>
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3638
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3719
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<pre style="margin: 0;"> <span id="LC3719" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Thus, we get</span></span>
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3639
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3720
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<pre style="margin: 0;"> <span id="LC3720" class="line" lang="haskell"></span>
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3640
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3721
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<pre style="margin: 0;"> <span id="LC3721" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> subst := { k1 |-> x1, k2 |-> *, a |-> (Proxy x1 y, z), b |-> z }</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">@@ -4081,15 +4162,9 @@ checkFieldCompat fld con1 con2 res1 res2 fty1 fty2</td>
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4081
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4162
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<pre style="margin: 0;"> <span id="LC4162" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-------------------------------</span></span>
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4082
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4163
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<pre style="margin: 0;"> <span id="LC4163" class="line" lang="haskell"><span class="n" style="color: #333;">checkValidDataCon</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</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;">DataCon</span> <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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4083
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4164
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<pre style="margin: 0;"> <span id="LC4164" class="line" lang="haskell"><span class="n" style="color: #333;">checkValidDataCon</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">existential_ok</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">con</span></span>
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4084
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<pre style="margin: 0;">-<span id="LC4084" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setSrcSpan</span> <span class="p">(</span><span class="n" style="color: #333;">getSrcSpan</span> <span class="n" style="color: #333;">con</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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4085
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<pre style="margin: 0;">-<span id="LC4085" class="line" lang="haskell"> <span class="n" style="color: #333;">addErrCtxt</span> <span class="p">(</span><span class="n" style="color: #333;">dataConCtxt</span> <span class="n" style="color: #333;">con</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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4086
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<pre style="margin: 0;">-<span id="LC4086" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="c1" style="color: #998; font-style: italic;">-- Check that the return type of the data constructor</span></span>
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4087
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<pre style="margin: 0;">-<span id="LC4087" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- matches the type constructor; eg reject this:</span></span>
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4088
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<pre style="margin: 0;">-<span id="LC4088" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- data T a where { MkT :: Bogus a }</span></span>
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4089
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<pre style="margin: 0;">-<span id="LC4089" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- It's important to do this first:</span></span>
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4090
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<pre style="margin: 0;">-<span id="LC4090" 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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4091
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<pre style="margin: 0;">-<span id="LC4091" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- and c.f. Note [Check role annotations in a second pass]</span></span>
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4092
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<pre style="margin: 0;">-<span id="LC4092" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">tc_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyConTyVars</span> <span class="n" style="color: #333;">tc</span></span>
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4165
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<pre style="margin: 0;">+<span id="LC4165" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setSrcSpan</span> <span class="n" style="color: #333;">con_loc</span> <span class="o" style="font-weight: 600;">$</span></span>
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4166
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<pre style="margin: 0;">+<span id="LC4166" class="line" lang="haskell"> <span class="n" style="color: #333;">addErrCtxt</span> <span class="p">(</span><span class="n" style="color: #333;">dataConCtxt</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">con_loc</span> <span class="n" style="color: #333;">con_name</span><span class="p">])</span> <span class="o" style="font-weight: 600;">$</span></span>
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4167
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<pre style="margin: 0;">+<span id="LC4167" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">tc_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyConTyVars</span> <span class="n" style="color: #333;">tc</span></span>
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4093
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4168
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<pre style="margin: 0;"> <span id="LC4168" class="line" lang="haskell"> <span class="n" style="color: #333;">res_ty_tmpl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkFamilyTyConApp</span> <span class="n" style="color: #333;">tc</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyVarTys</span> <span class="n" style="color: #333;">tc_tvs</span><span class="p">)</span></span>
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4094
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4169
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<pre style="margin: 0;"> <span id="LC4169" class="line" lang="haskell"> <span class="n" style="color: #333;">orig_res_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dataConOrigResTy</span> <span class="n" style="color: #333;">con</span></span>
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4095
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4170
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<pre style="margin: 0;"> <span id="LC4170" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"checkValidDataCon"</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</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">@@ -4098,6 +4173,18 @@ checkValidDataCon dflags existential_ok tc con</td>
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4098
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4173
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<pre style="margin: 0;"> <span id="LC4173" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">orig_res_ty</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">tcTypeKind</span> <span class="n" style="color: #333;">orig_res_ty</span><span class="p">)])</span></span>
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4099
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4174
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<pre style="margin: 0;"> <span id="LC4174" class="line" lang="haskell"></span>
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4100
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4175
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<pre style="margin: 0;"> <span id="LC4175" class="line" lang="haskell"></span>
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4176
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<pre style="margin: 0;">+<span id="LC4176" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Check that the return type of the data constructor</span></span>
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4177
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<pre style="margin: 0;">+<span id="LC4177" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- matches the type constructor; eg reject this:</span></span>
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4178
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<pre style="margin: 0;">+<span id="LC4178" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- data T a where { MkT :: Bogus a }</span></span>
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4179
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<pre style="margin: 0;">+<span id="LC4179" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- It's important to do this first:</span></span>
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4180
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<pre style="margin: 0;">+<span id="LC4180" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- see Note [rejigCon</span></span>
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4181
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<pre style="margin: 0;">+<span id="LC4181" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- and c.f. Note [Check role annotations in a second pass]</span></span>
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4182
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<pre style="margin: 0;">+<span id="LC4182" class="line" lang="haskell"></span>
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4183
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<pre style="margin: 0;">+<span id="LC4183" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Check that the return type of the data constructor is an instance</span></span>
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4184
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<pre style="margin: 0;">+<span id="LC4184" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- of the header of the header of data decl. This checks for</span></span>
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4185
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<pre style="margin: 0;">+<span id="LC4185" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- data T a where { MkT :: S a }</span></span>
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4186
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<pre style="margin: 0;">+<span id="LC4186" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- data instance D [a] where { MkD :: D (Maybe b) }</span></span>
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4187
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<pre style="margin: 0;">+<span id="LC4187" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- see Note [GADT return types]</span></span>
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4101
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4188
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<pre style="margin: 0;"> <span id="LC4188" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">checkTc</span> <span class="p">(</span><span class="n" style="color: #333;">isJust</span> <span class="p">(</span><span class="n" style="color: #333;">tcMatchTyKi</span> <span class="n" style="color: #333;">res_ty_tmpl</span> <span class="n" style="color: #333;">orig_res_ty</span><span class="p">))</span></span>
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4102
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4189
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<pre style="margin: 0;"> <span id="LC4189" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">badDataConTyCon</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">res_ty_tmpl</span><span class="p">)</span></span>
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4103
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4190
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<pre style="margin: 0;"> <span id="LC4190" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note that checkTc aborts if it finds an error. This is</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">@@ -4205,7 +4292,9 @@ checkValidDataCon dflags existential_ok tc con</td>
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4205
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4292
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<pre style="margin: 0;"> <span id="LC4292" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">f</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">tyConBinders</span> <span class="n" style="color: #333;">f</span><span class="p">)</span> <span class="p">]</span></span>
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4206
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4293
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<pre style="margin: 0;"> <span id="LC4293" class="line" lang="haskell"> <span class="p">}</span></span>
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4207
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4294
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<pre style="margin: 0;"> <span id="LC4294" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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4208
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<pre style="margin: 0;">-<span id="LC4208" class="line" lang="haskell"> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ConArgCtxt</span> <span class="p">(</span><span class="n" style="color: #333;">dataConName</span> <span class="n" style="color: #333;">con</span><span class="p">)</span></span>
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4295
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<pre style="margin: 0;">+<span id="LC4295" class="line" lang="haskell"> <span class="n" style="color: #333;">con_name</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dataConName</span> <span class="n" style="color: #333;">con</span></span>
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4296
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<pre style="margin: 0;">+<span id="LC4296" class="line" lang="haskell"> <span class="n" style="color: #333;">con_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nameSrcSpan</span> <span class="n" style="color: #333;">con_name</span></span>
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4297
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<pre style="margin: 0;">+<span id="LC4297" class="line" lang="haskell"> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ConArgCtxt</span> <span class="n" style="color: #333;">con_name</span></span>
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4209
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4298
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<pre style="margin: 0;"> <span id="LC4298" class="line" lang="haskell"> <span class="n" style="color: #333;">is_strict</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;">case</span></span>
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4210
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4299
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<pre style="margin: 0;"> <span id="LC4299" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NoSrcStrict</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">xopt</span> <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">StrictData</span> <span class="n" style="color: #333;">dflags</span></span>
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4211
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4300
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<pre style="margin: 0;"> <span id="LC4300" class="line" lang="haskell"> <span class="n" style="color: #333;">bang</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">isSrcStrict</span> <span class="n" style="color: #333;">bang</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">@@ -4869,14 +4958,17 @@ fieldTypeMisMatch field_name con1 con2</td>
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4869
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4958
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<pre style="margin: 0;"> <span id="LC4958" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sep</span> <span class="p">[</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Constructors"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">con1</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"and"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">con2</span><span class="p">,</span></span>
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4870
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4959
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<pre style="margin: 0;"> <span id="LC4959" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"give different types for field"</span><span class="p">,</span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">field_name</span><span class="p">)]</span></span>
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4871
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4960
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<pre style="margin: 0;"> <span id="LC4960" class="line" lang="haskell"></span>
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4872
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<pre style="margin: 0;">-<span id="LC4872" class="line" lang="haskell"><span class="n" style="color: #333;">dataConCtxtName</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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4873
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<pre style="margin: 0;">-<span id="LC4873" class="line" lang="haskell"><span class="n" style="color: #333;">dataConCtxtName</span> <span class="p">[</span><span class="n" style="color: #333;">con</span><span class="p">]</span></span>
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4874
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<pre style="margin: 0;">-<span id="LC4874" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"In the definition of data constructor"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">con</span><span class="p">)</span></span>
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4875
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<pre style="margin: 0;">-<span id="LC4875" class="line" lang="haskell"><span class="n" style="color: #333;">dataConCtxtName</span> <span class="n" style="color: #333;">con</span></span>
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4876
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<pre style="margin: 0;">-<span id="LC4876" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"In the definition of data constructors"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">interpp'SP</span> <span class="n" style="color: #333;">con</span></span>
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4961
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<pre style="margin: 0;">+<span id="LC4961" class="line" lang="haskell"><span class="n" style="color: #333;">dataConCtxt</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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4962
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<pre style="margin: 0;">+<span id="LC4962" class="line" lang="haskell"><span class="n" style="color: #333;">dataConCtxt</span> <span class="n" style="color: #333;">cons</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"In the definition of data constructor"</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">plural</span> <span class="n" style="color: #333;">cons</span></span>
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4963
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<pre style="margin: 0;">+<span id="LC4963" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr_cons</span> <span class="n" style="color: #333;">cons</span></span>
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4964
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<pre style="margin: 0;">+<span id="LC4964" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC4965" class="line" lang="haskell"><span class="n" style="color: #333;">dataConResCtxt</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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4966
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<pre style="margin: 0;">+<span id="LC4966" class="line" lang="haskell"><span class="n" style="color: #333;">dataConResCtxt</span> <span class="n" style="color: #333;">cons</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"In the result type of data constructor"</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">plural</span> <span class="n" style="color: #333;">cons</span></span>
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4967
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<pre style="margin: 0;">+<span id="LC4967" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr_cons</span> <span class="n" style="color: #333;">cons</span></span>
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4968
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<pre style="margin: 0;"> <span id="LC4968" class="line" lang="haskell"></span>
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4878
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<pre style="margin: 0;">-<span id="LC4878" class="line" lang="haskell"><span class="n" style="color: #333;">dataConCtxt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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4879
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<pre style="margin: 0;">-<span id="LC4879" class="line" lang="haskell"><span class="n" style="color: #333;">dataConCtxt</span> <span class="n" style="color: #333;">con</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"In the definition of data constructor"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">con</span><span class="p">)</span></span>
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4969
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<pre style="margin: 0;">+<span id="LC4969" class="line" lang="haskell"><span class="n" style="color: #333;">ppr_cons</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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4970
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<pre style="margin: 0;">+<span id="LC4970" class="line" lang="haskell"><span class="n" style="color: #333;">ppr_cons</span> <span class="p">[</span><span class="n" style="color: #333;">con</span><span class="p">]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">con</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC4971" class="line" lang="haskell"><span class="n" style="color: #333;">ppr_cons</span> <span class="n" style="color: #333;">cons</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">interpp'SP</span> <span class="n" style="color: #333;">cons</span></span>
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4972
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<pre style="margin: 0;"> <span id="LC4972" class="line" lang="haskell"></span>
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4973
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<pre style="margin: 0;"> <span id="LC4973" class="line" lang="haskell"><span class="n" style="color: #333;">classOpCtxt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<pre style="margin: 0;"> <span id="LC4974" class="line" lang="haskell"><span class="n" style="color: #333;">classOpCtxt</span> <span class="n" style="color: #333;">sel_id</span> <span class="n" style="color: #333;">tau</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sep</span> <span class="p">[</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"When checking the class method:"</span><span class="p">,</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -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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692
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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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693
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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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693
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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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695
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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">@@ -740,8 +739,9 @@ tcDataFamInstDecl mb_clsinfo tv_skol_env</td>
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740
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739
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<pre style="margin: 0;"> <span id="LC739" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">data_cons</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcExtendTyVarEnv</span> <span class="n" style="color: #333;">qtvs</span> <span class="o" style="font-weight: 600;">$</span></span>
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741
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740
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<pre style="margin: 0;"> <span id="LC740" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- For H98 decls, the tyvars scope</span></span>
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742
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741
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<pre style="margin: 0;"> <span id="LC741" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- over the data constructors</span></span>
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743
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<pre style="margin: 0;">-<span id="LC743" class="line" lang="haskell"> <span class="n" style="color: #333;">tcConDecls</span> <span class="n" style="color: #333;">rec_rep_tc</span> <span class="n" style="color: #333;">new_or_data</span> <span class="n" style="color: #333;">ty_binders</span> <span class="n" style="color: #333;">final_res_kind</span></span>
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744
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<pre style="margin: 0;">-<span id="LC744" class="line" lang="haskell"> <span class="n" style="color: #333;">orig_res_ty</span> <span class="n" style="color: #333;">hs_cons</span></span>
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<pre style="margin: 0;">+<span id="LC742" class="line" lang="haskell"> <span class="n" style="color: #333;">tcConDecls</span> <span class="n" style="color: #333;">new_or_data</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DDInstance</span> <span class="n" style="color: #333;">orig_res_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC743" class="line" lang="haskell"> <span class="n" style="color: #333;">rec_rep_tc</span> <span class="n" style="color: #333;">ty_binders</span> <span class="n" style="color: #333;">final_res_kind</span></span>
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<pre style="margin: 0;">+<span id="LC744" class="line" lang="haskell"> <span class="n" style="color: #333;">hs_cons</span></span>
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<pre style="margin: 0;"> <span id="LC745" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC746" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rep_tc_name</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newFamInstTyConName</span> <span class="n" style="color: #333;">lfam_name</span> <span class="n" style="color: #333;">pats</span></span>
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747
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<pre style="margin: 0;"> <span id="LC747" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">axiom_name</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newFamInstAxiomName</span> <span class="n" style="color: #333;">lfam_name</span> <span class="p">[</span><span class="n" style="color: #333;">pats</span><span class="p">]</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -857,7 +857,7 @@ TyVarEnv will simply be empty, and there is nothing to worry about.</td>
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857
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857
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<pre style="margin: 0;"> <span id="LC857" class="line" lang="haskell"><span class="n" style="color: #333;">tcDataFamInstHeader</span></span>
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858
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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;">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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859
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859
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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;">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="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>
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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;">NewOrData</span></span>
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<pre style="margin: 0;"> <span id="LC862" 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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<pre style="margin: 0;"> <span id="LC863" 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="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -865,7 +865,7 @@ tcDataFamInstHeader</td>
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<pre style="margin: 0;"> <span id="LC865" 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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<pre style="margin: 0;"> <span id="LC866" 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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<pre style="margin: 0;"> <span id="LC867" 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="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;">new_or_data</span></span>
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869
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<pre style="margin: 0;"> <span id="LC869" 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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<pre style="margin: 0;"> <span id="LC870" 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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<pre style="margin: 0;"> <span id="LC871" 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 +884,8 @@ tcDataFamInstHeader mb_clsinfo fam_tc outer_bndrs fixity</td>
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<pre style="margin: 0;"> <span id="LC884" 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="LC885" 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="LC886" 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="LC887" 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="LC888" 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="LC889" class="line" lang="haskell"></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;">-- Check that the result kind of the TyCon applied to its args</span></span>
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<pre style="margin: 0;"> <span id="LC891" 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 +1049,86 @@ however, so this Note aims to describe these subtleties:</td>
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1049
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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;"> themselves. Heavy sigh. But not truly hard; that's what tcbVisibilities</span></span>
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1050
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1050
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<pre style="margin: 0;"> <span id="LC1050" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> does.</span></span>
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1051
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<pre style="margin: 0;"> <span id="LC1051" class="line" lang="haskell"></span>
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1052
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<pre style="margin: 0;">+<span id="LC1052" 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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1053
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<pre style="margin: 0;">+<span id="LC1053" 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="LC1054" 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="LC1055" 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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1056
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<pre style="margin: 0;">+<span id="LC1056" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">quite distinct from a,b.</span></span>
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1057
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<pre style="margin: 0;">+<span id="LC1057" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T a b where</span></span>
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1058
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<pre style="margin: 0;">+<span id="LC1058" 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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1059
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<pre style="margin: 0;">+<span id="LC1059" class="line" lang="haskell"></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;">Following Note [Inferring kinds for type declarations] in GHC.Tc.TyCl,</span></span>
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<pre style="margin: 0;">+<span id="LC1061" 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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1062
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<pre style="margin: 0;">+<span id="LC1062" 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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1063
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<pre style="margin: 0;">+<span id="LC1063" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> T :: (kappa1 -> type) -> kappa1 -> Type</span></span>
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1064
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<pre style="margin: 0;">+<span id="LC1064" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Then we generalise, giving</span></span>
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1065
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<pre style="margin: 0;">+<span id="LC1065" 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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1066
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<pre style="margin: 0;">+<span id="LC1066" class="line" lang="haskell"></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;">Now what about a data /instance/ decl</span></span>
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1068
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<pre style="margin: 0;">+<span id="LC1068" 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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1069
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<pre style="margin: 0;">+<span id="LC1069" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1070" 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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1071
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<pre style="margin: 0;">+<span id="LC1071" class="line" lang="haskell"></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;">No doubt here! The poly-kinded T is instantiated with k=Type, so the</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;">header really looks like</span></span>
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1074
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<pre style="margin: 0;">+<span id="LC1074" 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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1075
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<pre style="margin: 0;">+<span id="LC1075" class="line" lang="haskell"></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;">But what about this?</span></span>
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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;"> data instance T p q where</span></span>
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1078
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<pre style="margin: 0;">+<span id="LC1078" 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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1079
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<pre style="margin: 0;">+<span id="LC1079" class="line" lang="haskell"></span>
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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;">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="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;">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="1082" 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">
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;">that mean that the the /entire data instance/ is instantiated at Type,</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;">like this?</span></span>
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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;"> data instance T @Type (p :: Type->Type) (q :: Type) where</span></span>
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1085
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<pre style="margin: 0;">+<span id="LC1085" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ...</span></span>
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1086
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<pre style="margin: 0;">+<span id="LC1086" class="line" lang="haskell"></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;">Not at all! This is a /GADT/-style decl, so the kind argument might</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;">be specialised in this particular data constructor, thus:</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;"> data instance T @k (p :: k->Type) (q :: k) where</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;"> MkT :: forall (r :: Type -> Type).</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;"> r Int -> T @Type r Int</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;">(and perhaps specialised differently in some other data</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1093" 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">
1093
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<pre style="margin: 0;">+<span id="LC1093" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">constructor MkT2).</span></span>
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1094
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<pre style="margin: 0;">+<span id="LC1094" class="line" lang="haskell"></span>
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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;">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="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;">is that we have no known kind for 'data T'. We thus forbid different</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;">specialisations of T in its constructors, in an attempt to avoid</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;">inferring polymorphic recursion. In data family T, however, there is</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;">no problem with polymorphic recursion: we already /fully know/ T's</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;">kind -- that came from the family declaration, and is not influenced</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;">by the data instances -- and hence we /can/ specialise T's kind</span></span>
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1102
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<pre style="margin: 0;">+<span id="LC1102" 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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1103
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<pre style="margin: 0;">+<span id="LC1103" class="line" lang="haskell"></span>
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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;">SHORT SUMMARY: in a data instance decl, it's not clear whether kind</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;">constraints arising from the data constructors should be considered</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;">local to the (GADT) data /constructor/ or should apply to the entire</span></span>
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1107
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<pre style="margin: 0;">+<span id="LC1107" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">data instance.</span></span>
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1108
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<pre style="margin: 0;">+<span id="LC1108" class="line" lang="haskell"></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;">DESIGN CHOICE: in data/newtype family instance declarations, we ignore</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;">the /data constructor/ declarations altogether, looking only at the</span></span>
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1111
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<pre style="margin: 0;">+<span id="LC1111" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">data instance /header/.</span></span>
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1112
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<pre style="margin: 0;">+<span id="LC1112" class="line" lang="haskell"></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;">Observations:</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;">* This choice is simple to describe, as well as simple to implment.</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;"> For a data/newtype instance decl, the instance kinds are influenced</span></span>
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1116
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<pre style="margin: 0;">+<span id="LC1116" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> /only/ by the header.</span></span>
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1117
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<pre style="margin: 0;">+<span id="LC1117" class="line" lang="haskell"></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;">* We could treat Haskell-98 style data-instance decls differently, by</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;"> taking the data constructors into account, since there are no GADT</span></span>
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1120
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<pre style="margin: 0;">+<span id="LC1120" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> issues. But we don't, for simplicity, and because it means you can</span></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;"> understand the data type instance by looking only at the header.</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;">* Newtypes can be declared in GADT syntax, but they can't do GADT-style</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;"> specialisation, so like Haskell-98 definitions we could take the</span></span>
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1125
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<pre style="margin: 0;">+<span id="LC1125" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data constructors into account. Again we don't, for the same reason.</span></span>
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1126
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<pre style="margin: 0;">+<span id="LC1126" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1127" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So for now at least, we keep the simplest choice. See #18891 and !4419</span></span>
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1128
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<pre style="margin: 0;">+<span id="LC1128" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">for more discussion of this issue.</span></span>
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1129
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<pre style="margin: 0;">+<span id="LC1129" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1130" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Kind inference for data types (Xie et al) https://arxiv.org/abs/1911.06153</span></span>
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1131
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<pre style="margin: 0;">+<span id="LC1131" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">takes a slightly different approach.</span></span>
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1132
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<pre style="margin: 0;"> <span id="LC1132" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1133
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<pre style="margin: 0;"> <span id="LC1133" class="line" lang="haskell"></span>
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1134
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<pre style="margin: 0;"> <span id="LC1134" 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">@@ -14,6 +14,11 @@ Language</td>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="plaintext"> (Serrano et al, ICFP 2020). More information here: :ref:`impredicative-polymorphism`.</span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="plaintext"> This replaces the old (undefined, flaky) behaviour of the :extension:`ImpredicativeTypes` extension.</span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="plaintext">* Kind inference for data/newtype instance declarations is slightly</span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext"> more restrictive than before. See the user manual :ref:`kind-inference-data-family-instances`.</span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="plaintext"> This is a breaking change, albeit a fairly obscure one that corrects a specification bug.</span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="plaintext">Compiler</span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="plaintext">~~~~~~~~</span>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="plaintext"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/558cabbc5fbd34d4bd47acf50a1c22d44dd41b97#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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<pre style="margin: 0;">+<span id="LC134" class="line" lang="plaintext">---------------------------------</span>
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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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<pre style="margin: 0;">+<span id="LC139" class="line" lang="plaintext">For example,</span>
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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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<pre style="margin: 0;">+<span id="LC141" class="line" lang="plaintext"></span>
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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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<pre style="margin: 0;">+<span id="LC143" class="line" lang="plaintext"> p :: forall a. Proxy a</span>
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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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<pre style="margin: 0;">+<span id="LC145" class="line" lang="plaintext"></span>
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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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<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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<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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<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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<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="LC152" class="line" lang="plaintext">.. _explicit-kind-quantification:</span>
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<pre style="margin: 0;">+<span id="LC154" class="line" lang="plaintext">Explicit kind quantification</span>
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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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<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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<pre style="margin: 0;">+<span id="LC159" class="line" lang="plaintext"></span>
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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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<pre style="margin: 0;">+<span id="LC161" class="line" lang="plaintext"> f :: (forall k (a :: k). Proxy a -> ()) -> Int</span>
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<pre style="margin: 0;">+<span id="LC162" class="line" lang="plaintext"></span>
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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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<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="LC167" class="line" lang="plaintext"></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 +527,91 @@ 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="LC493" class="line" lang="plaintext">Kind inference in <span class="idiff left right">closed type familie</span>s</span>
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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="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="LC534" class="line" lang="plaintext"></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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<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 -> Type</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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<pre style="margin: 0;">+<span id="LC545" class="line" lang="plaintext"></span>
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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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<pre style="margin: 0;">+<span id="LC547" class="line" lang="plaintext"> GInt :: G Int</span>
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<pre style="margin: 0;">+<span id="LC548" class="line" lang="plaintext"> GMaybe :: G Maybe</span>
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<pre style="margin: 0;">+<span id="LC549" class="line" lang="plaintext"></span>
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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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<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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<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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<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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<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 (CUSK)</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">If you wish to see the kind indexing explicitly, you can do so by enabling :ghc-flag:`-fprint-explicit-kinds` and querying ``G`` with GHCi's :ghci-cmd:`:info` command: ::</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"> > :set -fprint-explicit-kinds</span>
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569
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<pre style="margin: 0;">+<span id="LC569" class="line" lang="plaintext"> > :info G</span>
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570
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<pre style="margin: 0;">+<span id="LC570" class="line" lang="plaintext"> type role G nominal nominal</span>
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571
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<pre style="margin: 0;">+<span id="LC571" class="line" lang="plaintext"> type G :: forall k. k -> Type</span>
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572
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<pre style="margin: 0;">+<span id="LC572" class="line" lang="plaintext"> data G @k a where</span>
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573
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<pre style="margin: 0;">+<span id="LC573" class="line" lang="plaintext"> GInt :: G @Type Int</span>
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574
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<pre style="margin: 0;">+<span id="LC574" class="line" lang="plaintext"> GMaybe :: G @(Type -> Type) Maybe</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">where you can see the GADT-like nature of the two constructors.</span>
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577
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<pre style="margin: 0;">+<span id="LC577" class="line" lang="plaintext"></span>
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578
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<pre style="margin: 0;">+<span id="LC578" class="line" lang="plaintext">.. _kind-inference-data-family-instances:</span>
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579
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<pre style="margin: 0;">+<span id="LC579" class="line" lang="plaintext"></span>
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580
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<pre style="margin: 0;">+<span id="LC580" class="line" lang="plaintext">Kind inference for data/newtype instance declarations</span>
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581
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<pre style="margin: 0;">+<span id="LC581" class="line" lang="plaintext">-----------------------------------------------------</span>
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582
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<pre style="margin: 0;">+<span id="LC582" class="line" lang="plaintext"></span>
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583
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<pre style="margin: 0;">+<span id="LC583" class="line" lang="plaintext">Consider these declarations ::</span>
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584
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<pre style="margin: 0;">+<span id="LC584" class="line" lang="plaintext"></span>
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585
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<pre style="margin: 0;">+<span id="LC585" class="line" lang="plaintext"> data family T :: forall k. (k->Type) -> k -> Type</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 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">Here ``T`` has an invisible kind argument; and perhaps it is instantiated</span>
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591
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<pre style="margin: 0;">+<span id="LC591" class="line" lang="plaintext">to ``Type`` in the instance, thus ::</span>
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592
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<pre style="margin: 0;">+<span id="LC592" class="line" lang="plaintext"></span>
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593
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<pre style="margin: 0;">+<span id="LC593" class="line" lang="plaintext"> data instance T @Type (p :: Type->Type) (q :: Type) where</span>
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594
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<pre style="margin: 0;">+<span id="LC594" class="line" lang="plaintext"> MkT :: forall r. r Int -> T r Int</span>
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595
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<pre style="margin: 0;">+<span id="LC595" class="line" lang="plaintext"></span>
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596
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<pre style="margin: 0;">+<span id="LC596" class="line" lang="plaintext">Or perhaps we intended the specialisation to be in the GADT data</span>
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597
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<pre style="margin: 0;">+<span id="LC597" class="line" lang="plaintext">constructor, thus ::</span>
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598
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<pre style="margin: 0;">+<span id="LC598" class="line" lang="plaintext"></span>
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599
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<pre style="margin: 0;">+<span id="LC599" class="line" lang="plaintext"> data instance T @k (p :: k->Type) (q :: k) where</span>
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600
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<pre style="margin: 0;">+<span id="LC600" class="line" lang="plaintext"> MkT :: forall r. r Int -> T @Type r Int</span>
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601
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<pre style="margin: 0;">+<span id="LC601" class="line" lang="plaintext"></span>
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602
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<pre style="margin: 0;">+<span id="LC602" class="line" lang="plaintext">It gets more complicated if there are multiple constructors. In</span>
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603
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<pre style="margin: 0;">+<span id="LC603" class="line" lang="plaintext">general, there is no principled way to tell which type specialisation</span>
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604
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<pre style="margin: 0;">+<span id="LC604" class="line" lang="plaintext">comes from the data instance, and which from the individual GADT data</span>
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605
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<pre style="margin: 0;">+<span id="LC605" class="line" lang="plaintext">constructors.</span>
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606
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<pre style="margin: 0;">+<span id="LC606" class="line" lang="plaintext"></span>
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607
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<pre style="margin: 0;">+<span id="LC607" class="line" lang="plaintext">So GHC implements this rule: in data/newtype instance declararations</span>
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608
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<pre style="margin: 0;">+<span id="LC608" class="line" lang="plaintext">(unlike ordinary data/newtype declarations) we do *not* look at the</span>
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609
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<pre style="margin: 0;">+<span id="LC609" class="line" lang="plaintext">constructor declarations when inferring the shape of the instance</span>
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610
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<pre style="margin: 0;">+<span id="LC610" class="line" lang="plaintext">header. The principle is that *the instantiation of the data instance</span>
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611
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<pre style="margin: 0;">+<span id="LC611" class="line" lang="plaintext">should be apparent from the header alone*. This principle makes the</span>
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612
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<pre style="margin: 0;">+<span id="LC612" class="line" lang="plaintext">program easier to understand, and avoids the swamp of complexity</span>
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613
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<pre style="margin: 0;">+<span id="LC613" class="line" lang="plaintext">indicated above.</span>
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614
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<pre style="margin: 0;"> <span id="LC614" class="line" lang="plaintext"></span>
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523
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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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524
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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="LC615" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC616" class="line" lang="plaintext">Kind inference in class instance declarations</span>
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617
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<pre style="margin: 0;"> <span id="LC617" 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 +642,8 @@ infrastructure, and it's not clear the payoff is worth it. If you want</td>
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642
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<pre style="margin: 0;"> <span id="LC642" class="line" lang="plaintext">to restrict ``b``\ 's kind in the instance above, just use a kind</span>
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556
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643
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<pre style="margin: 0;"> <span id="LC643" class="line" lang="plaintext">signature in the instance head.</span>
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557
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644
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<pre style="margin: 0;"> <span id="LC644" class="line" lang="plaintext"></span>
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558
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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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559
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<pre style="margin: 0;">-<span id="LC559" class="line" lang="plaintext">---------------------------------</span>
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560
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<pre style="margin: 0;">-<span id="LC560" class="line" lang="plaintext"></span>
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561
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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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562
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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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583
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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="LC645" class="line" lang="plaintext">Kind inference in type synonyms and type family instances</span>
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<pre style="margin: 0;">+<span id="LC646" class="line" lang="plaintext">---------------------------------------------------------</span>
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<pre style="margin: 0;"> <span id="LC647" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC648" class="line" lang="plaintext">Consider the scoping rules for type synonyms and type family instances, such as</span>
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<pre style="margin: 0;"> <span id="LC649" 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 +758,44 @@ kinds. Consequently, visible dependent quantifiers are rejected in any context</td>
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<pre style="margin: 0;"> <span id="LC758" class="line" lang="plaintext">that is unambiguously the type of a term. They are also rejected in the types</span>
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759
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<pre style="margin: 0;"> <span id="LC759" class="line" lang="plaintext">of data constructors.</span>
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<pre style="margin: 0;"> <span id="LC760" class="line" lang="plaintext"></span>
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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="LC761" 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="LC762" class="line" lang="plaintext">------------------<span class="idiff left right">--------------------</span></span>
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<pre style="margin: 0;"> <span id="LC763" 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="LC764" 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="LC765" class="line" lang="plaintext">user-supplied kind signature (:ref:`complete-kind-signatures`),</span>
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<pre style="margin: 0;">+<span id="LC766" class="line" lang="plaintext">we can relax this condition for closed</span>
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<pre style="margin: 0;">+<span id="LC767" 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="LC768" 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="LC769" class="line" lang="plaintext">closed type family.</span>
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<pre style="margin: 0;"> <span id="LC770" 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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771
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<pre style="margin: 0;">+<span id="LC771" class="line" lang="plaintext">GHC supports *kind-indexed* type families, where the family matches both</span>
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772
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<pre style="margin: 0;">+<span id="LC772" class="line" lang="plaintext">on the kind and type. GHC will *not* infer this behaviour without a</span>
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773
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<pre style="margin: 0;">+<span id="LC773" class="line" lang="plaintext">complete user-supplied kind signature or standalone kind</span>
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774
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<pre style="margin: 0;">+<span id="LC774" class="line" lang="plaintext">signature (see :ref:`standalone-kind-signatures`),</span>
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<pre style="margin: 0;">+<span id="LC775" class="line" lang="plaintext">because doing so would sometimes infer</span>
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<pre style="margin: 0;">+<span id="LC776" 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="LC777" 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="LC778" class="line" lang="plaintext">its most general in its own definition.</span>
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717
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779
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<pre style="margin: 0;"> <span id="LC779" class="line" lang="plaintext"></span>
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718
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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="LC780" class="line" lang="plaintext">For example: ::</span>
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726
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781
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<pre style="margin: 0;"> <span id="LC781" class="line" lang="plaintext"></span>
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727
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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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728
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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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729
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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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<pre style="margin: 0;">+<span id="LC782" class="line" lang="plaintext"> type family F1 a where</span>
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<pre style="margin: 0;">+<span id="LC783" class="line" lang="plaintext"> F1 True = False</span>
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<pre style="margin: 0;">+<span id="LC784" class="line" lang="plaintext"> F1 False = True</span>
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<pre style="margin: 0;">+<span id="LC785" class="line" lang="plaintext"> F1 x = x</span>
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<pre style="margin: 0;">+<span id="LC786" class="line" lang="plaintext"> -- F1 fails to compile: kind-indexing is not inferred</span>
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787
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<pre style="margin: 0;">+<span id="LC787" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC788" class="line" lang="plaintext"> type family F2 (a :: k) where</span>
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<pre style="margin: 0;">+<span id="LC789" class="line" lang="plaintext"> F2 True = False</span>
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<pre style="margin: 0;">+<span id="LC790" class="line" lang="plaintext"> F2 False = True</span>
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<pre style="margin: 0;">+<span id="LC791" class="line" lang="plaintext"> F2 x = x</span>
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<pre style="margin: 0;">+<span id="LC792" class="line" lang="plaintext"> -- F2 fails to compile: no complete signature</span>
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<pre style="margin: 0;">+<span id="LC793" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC794" class="line" lang="plaintext"> type family F3 (a :: k) :: k where</span>
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<pre style="margin: 0;">+<span id="LC795" class="line" lang="plaintext"> F3 True = False</span>
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<pre style="margin: 0;">+<span id="LC796" class="line" lang="plaintext"> F3 False = True</span>
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<pre style="margin: 0;">+<span id="LC797" class="line" lang="plaintext"> F3 x = x</span>
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<pre style="margin: 0;">+<span id="LC798" class="line" lang="plaintext"> -- OK</span>
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799
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<pre style="margin: 0;"> <span id="LC799" class="line" lang="plaintext"></span>
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800
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<pre style="margin: 0;"> <span id="LC800" class="line" lang="plaintext">Higher-rank kinds</span>
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801
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<pre style="margin: 0;"> <span id="LC801" class="line" lang="plaintext">-----------------</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/558cabbc5fbd34d4bd47acf50a1c22d44dd41b97#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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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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4
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4
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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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5
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5
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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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6
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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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<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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<pre style="margin: 0;"> <span id="LC9" class="line" lang="plaintext"> In the definition of data constructor ‘SMkFoo’</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">@@ -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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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/558cabbc5fbd34d4bd47acf50a1c22d44dd41b97#5b83e99d7c85673bbd8af817bf225cf3695013b9"><strong>testsuite/tests/deriving/should_compile/T9359.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">@@ -9,6 +9,5 @@ data Cmp a where</td>
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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="LC10" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">CmpInterval</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;">Cmp</span> <span class="n" style="color: #333;">k</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Cmp</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="LC12" 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;">CmpInterval</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">V</span> <span class="n" style="color: #333;"><span class="idiff left">c</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Sup</span></span><span class="idiff right"> </span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Starting</span> <span class="n" style="color: #333;">c</span></span>
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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="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">CmpInterval</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">V</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">c</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">))</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Sup</span></span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Starting</span> <span class="n" style="color: #333;">c</span></span>
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<pre style="margin: 0;"> <span id="LC13" 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></pre>
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<pre style="margin: 0;">-<span id="LC14" class="line" lang="haskell"></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/558cabbc5fbd34d4bd47acf50a1c22d44dd41b97#f40c9b04fcb3dedd30e8d1d111028fd38a3bd533"><strong>testsuite/tests/indexed-types/should_compile/T14111.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 MagicHash, UnboxedSums, NoImplicitPrelude #-}</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 TypeFamilies #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- {-# LANGUAGE PolyKinds #-}</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 MultiParamTypeClasses #-}</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 FunctionalDependencies #-}</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 TypeInType #-}</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 ,ExplicitNamespaces#-}</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 UnboxedTuples #-}</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;">T14111</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.Exts</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.Types</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;">Prelude</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">undefined</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;">import</span> <span class="nn" style="color: #555;">Data.Kind</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Void</span></span>
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17
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"></span>
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18
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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;">Maybe</span><span class="p">(</span><span class="n" style="color: #333;">x</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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19
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"></span>
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20
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<pre style="margin: 0;">+<span id="LC20" 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;">Maybe</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="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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21
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MaybeSum</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</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="p">(</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="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">a</span></span>
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22
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"></span>
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23
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<pre style="margin: 0;">+<span id="LC23" 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;">Maybe</span> <span class="p">(</span><span class="n" style="color: #333;">x</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;">'UnliftedRep</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="LC24" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MaybeSumU</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</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="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">x</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/558cabbc5fbd34d4bd47acf50a1c22d44dd41b97#ebaa39285a49455fd932d452d44b589c7d50f8f3"><strong>testsuite/tests/indexed-types/should_compile/T8707.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 TypeFamilies, PolyKinds, DataKinds, GADTs #-}</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;">T8707</span> <span class="kr" style="font-weight: 600;">where</span></span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Kind</span></span>
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6
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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;">SingDF</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="n" style="color: #333;">k</span><span class="p">,</span> <span class="n" style="color: #333;">k2</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">))</span></span>
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8
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Ctor</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span></span>
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9
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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;">data</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">SingDF</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</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="kr" style="font-weight: 600;">where</span></span>
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11
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SFalse</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SingDF</span> <span class="n" style="color: #333;">'</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Ctor</span><span class="p">)</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">@@ -300,3 +300,5 @@ test('T18809', normal, compile, ['-O'])</td>
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<pre style="margin: 0;"> <span id="LC300" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">CEqCanOccursCheck</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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301
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<pre style="margin: 0;"> <span id="LC301" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">GivenLoop</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="LC302" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18875</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="LC303" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T8707</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 class="s1" style="color: #d14;">-O</span><span class="p">'])</span></span>
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<pre style="margin: 0;">+<span id="LC304" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T14111</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 class="s1" style="color: #d14;">-O</span><span class="p">'])</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/558cabbc5fbd34d4bd47acf50a1c22d44dd41b97#9ce3533e3d2bdc2ed2d290e31021207c39fd5729"><strong>testsuite/tests/indexed-types/should_fail/T8368.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">T8368.hs:9:3:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> Data constructor ‘MkFam’ returns type ‘Foo’</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> instead of an instance of its parent type ‘Fam a’</span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> In the definition of data constructor ‘MkFam’</span>
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext"> In the data instance declaration for ‘Fam’</span></pre>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T8368.hs:9:3: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Couldn't match expected type ‘Fam a0’ with actual type ‘Foo’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> • In the result type of data constructor ‘MkFam’</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> In the data instance declaration for ‘Fam’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/558cabbc5fbd34d4bd47acf50a1c22d44dd41b97#022292799466b9b31e4522069903c5b0fac15e9c"><strong>testsuite/tests/indexed-types/should_fail/T8368a.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">T8368a.hs:7:3:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> Data constructor ‘MkFam’ returns type ‘Fam Bool b’</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> instead of an instance of its parent type ‘Fam Int b’</span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> In the definition of data constructor ‘MkFam’</span>
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext"> In the data instance declaration for ‘Fam’</span></pre>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T8368a.hs:7:3: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Couldn't match type ‘Bool’ with ‘Int’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> Expected: Fam Int b</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> Actual: Fam Bool b</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> • In the result type of data constructor ‘MkFam’</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> In the data instance declaration for ‘Fam’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/558cabbc5fbd34d4bd47acf50a1c22d44dd41b97#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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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/558cabbc5fbd34d4bd47acf50a1c22d44dd41b97#9cf9e43ad6ba49c6f9ba05365e796e4358376763"><strong>testsuite/tests/polykinds/T13659.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">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/558cabbc5fbd34d4bd47acf50a1c22d44dd41b97#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/558cabbc5fbd34d4bd47acf50a1c22d44dd41b97#5c74fb2bdbb2042694ffd2e618b0efb408c68d8e"><strong>testsuite/tests/th/T11145.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">T11145.hs:8:1: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • Data constructor ‘MkFuggle’ returns type ‘Fuggle</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> Int (Maybe Bool)’</span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> instead of an instance of its parent type ‘Fuggle</span>
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext"> Int (Maybe (a, b))’</span>
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<pre style="margin: 0;">-<span id="LC7" class="line" lang="plaintext"> • In the definition of data constructor ‘MkFuggle’</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Couldn't match type ‘Bool’ with ‘(a0, b0)’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> Expected: Fuggle Int (Maybe (a0, b0))</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> Actual: Fuggle Int (Maybe Bool)</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> • In the result type of data constructor ‘MkFuggle’</span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext"> In the data instance declaration for ‘Fuggle’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/558cabbc5fbd34d4bd47acf50a1c22d44dd41b97#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/558cabbc5fbd34d4bd47acf50a1c22d44dd41b97#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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<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/558cabbc5fbd34d4bd47acf50a1c22d44dd41b97#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/558cabbc5fbd34d4bd47acf50a1c22d44dd41b97#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="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="n" style="color: #333;"><span class="idiff left">a</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 class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">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/558cabbc5fbd34d4bd47acf50a1c22d44dd41b97#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">@@ -736,3 +736,4 @@ test('InstanceGivenOverlap', normal, compile, [''])</td>
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<pre style="margin: 0;"> <span id="LC736" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">InstanceGivenOverlap2</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="LC737" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">LocalGivenEqs</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="LC738" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">LocalGivenEqs2</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="LC739" 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></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/558cabbc5fbd34d4bd47acf50a1c22d44dd41b97#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="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/558cabbc5fbd34d4bd47acf50a1c22d44dd41b97#00704c21d708b5b0eae6c68bd8d6a0559be1c753"><strong>testsuite/tests/typecheck/should_fail/T18891a.stderr</strong></a>
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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/558cabbc5fbd34d4bd47acf50a1c22d44dd41b97#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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5
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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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5
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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/558cabbc5fbd34d4bd47acf50a1c22d44dd41b97#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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12
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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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19
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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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<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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23
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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/558cabbc5fbd34d4bd47acf50a1c22d44dd41b97#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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8
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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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9
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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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<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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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/558cabbc5fbd34d4bd47acf50a1c22d44dd41b97#b9e86d897a62509b0114d81d5e736630d6f68f43"><strong>testsuite/tests/typecheck/should_fail/all.T</strong></a>
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<td class="diff-line-num unfold js-unfold old_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>
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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">@@ -546,6 +546,7 @@ test('UnliftedNewtypesConstraintFamily', normal, compile_fail, [''])</td>
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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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549
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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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549
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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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551
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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="591" 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="592" 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">@@ -591,3 +592,4 @@ test('T18640c', normal, compile_fail, [''])</td>
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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;">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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592
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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;">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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594
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<pre style="margin: 0;"> <span id="LC594" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">GivenForallLoop</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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595
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<pre style="margin: 0;">+<span id="LC595" 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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