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<h3>
Marge Bot pushed to branch master
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/760307cf5511d970dfddf7fa4b502b4e3394b197">760307cf</a></strong>
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<span>by Artyom Kuznetsov</span>
<i>at 2020-09-19T15:52:21-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove GADT self-reference check (#11554, #12081, #12174, fixes #15942)
Reverts 430f5c84dac1eab550110d543831a70516b5cac8
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<h4>11 changed files:</h4>
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<a href="#9355bef855426caf5f526925edf351b20f9a86c4">
compiler/GHC/Tc/Gen/HsType.hs
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<a href="#6b92a10d9028241e8adc1ceee8cdad4b63e48ac0">
testsuite/tests/dependent/should_fail/T12174.hs
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testsuite/tests/dependent/should_compile/T12174.hs
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<a href="#a4ff33ccde330caaa403f371defa5ddc5ad10c84">
testsuite/tests/dependent/should_compile/all.T
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<a href="#de2534aad704f809011a98e5e6a9eaad78d68453">
testsuite/tests/dependent/should_fail/T12081.stderr
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<a href="#ab29785054df2951e0108758350ff74be5155252">
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testsuite/tests/dependent/should_fail/T12174.stderr
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<a href="#ff9e00d3839a68830e26f2566987483d69b42545">
testsuite/tests/dependent/should_fail/all.T
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<li class="file-stats">
<a href="#cf234a7e850f12504ae81d73de3dae175441d345">
testsuite/tests/polykinds/T11554.hs
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testsuite/tests/polykinds/T11554.stderr
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<a href="#37bb83d0a916288b2296ba25cdbbef228eed6484">
testsuite/tests/polykinds/all.T
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<a href="#97c29c052ebb329e68d8296b53cbceeb7d540f59">
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testsuite/tests/typecheck/should_compile/T15942.hs
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<a href="#34fe7bf0e6fbf60effb28393399ba68666593909">
testsuite/tests/typecheck/should_compile/all.T
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<h4>Changes:</h4>
<li id="9355bef855426caf5f526925edf351b20f9a86c4">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/760307cf5511d970dfddf7fa4b502b4e3394b197#9355bef855426caf5f526925edf351b20f9a86c4"><strong>compiler/GHC/Tc/Gen/HsType.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1798" 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="1798" 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">@@ -1798,11 +1798,9 @@ tcTyVar mode name -- Could be a tyvar, a tycon, or a datacon</td>
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1798
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1798
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<pre style="margin: 0;"> <span id="LC1798" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">thing</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1799
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1799
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<pre style="margin: 0;"> <span id="LC1799" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ATyVar</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">tv</span><span class="p">,</span> <span class="n" style="color: #333;">tyVarKind</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span></span>
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1800
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1800
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<pre style="margin: 0;"> <span id="LC1800" class="line" lang="haskell"></span>
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1801
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<pre style="margin: 0;">+<span id="LC1801" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Recursion through the kinds]</span></span>
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1801
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1802
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<pre style="margin: 0;"> <span id="LC1802" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ATcTyCon</span> <span class="n" style="color: #333;">tc_tc</span></span>
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1802
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<pre style="margin: 0;">-<span id="LC1802" 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="c1" style="color: #998; font-style: italic;">-- See Note [GADT kind self-reference]</span></span>
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1803
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<td class="diff-line-num new_line old" data-linenumber="1803" 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="LC1803" class="line" lang="haskell"> <span class="n" style="color: #333;">unless</span> <span class="p">(</span><span class="n" style="color: #333;">isTypeLevel</span> <span class="p">(</span><span class="n" style="color: #333;">mode_tyki</span> <span class="n" style="color: #333;">mode</span><span class="p">))</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1804" 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">
1804
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<pre style="margin: 0;">-<span id="LC1804" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">promotionErr</span> <span class="n" style="color: #333;">name</span> <span class="kt" style="color: #458; font-weight: 600;">TyConPE</span><span class="p">)</span></span>
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1805
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<pre style="margin: 0;">-<span id="LC1805" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">check_tc</span> <span class="n" style="color: #333;">tc_tc</span></span>
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<pre style="margin: 0;">+<span id="LC1803" 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;">check_tc</span> <span class="n" style="color: #333;">tc_tc</span></span>
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<pre style="margin: 0;"> <span id="LC1804" 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;">mkTyConTy</span> <span class="n" style="color: #333;">tc_tc</span><span class="p">,</span> <span class="n" style="color: #333;">tyConKind</span> <span class="n" style="color: #333;">tc_tc</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1805" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1806" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">AGlobal</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ATyCon</span> <span class="n" style="color: #333;">tc</span><span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1841" 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">@@ -1843,25 +1841,34 @@ tcTyVar mode name -- Could be a tyvar, a tycon, or a datacon</td>
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1843
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<pre style="margin: 0;"> <span id="LC1841" class="line" lang="haskell"> <span class="n" style="color: #333;">dc_theta_illegal_constraint</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">find</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">isEqPred</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1842" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1843" 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="LC1846" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [GADT kind self-reference]</span></span>
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<pre style="margin: 0;">-<span id="LC1847" 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="LC1848" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1849" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">A promoted type cannot be used in the body of that type's declaration.</span></span>
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<pre style="margin: 0;">-<span id="LC1850" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">#11554 shows this example, which made GHC loop:</span></span>
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<pre style="margin: 0;">+<span id="LC1844" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Recursion through the kinds]</span></span>
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<pre style="margin: 0;">+<span id="LC1845" 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="LC1846" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider these examples</span></span>
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<pre style="margin: 0;"> <span id="LC1847" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1852" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right"> import Data.Kind</span></span></span>
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<pre style="margin: 0;">+<span id="LC1848" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">#11554:</span></span></span>
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<pre style="margin: 0;"> <span id="LC1849" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data P (x :: k) = Q</span></span>
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<pre style="margin: 0;"> <span id="LC1850" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data A :: Type where</span></span>
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<pre style="margin: 0;">-<span id="LC1855" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> B :: forall (a :: A). P a -> A</span></span>
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<pre style="margin: 0;">+<span id="LC1851" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkA :: forall (a :: A). P a -> A</span></span>
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<pre style="margin: 0;">+<span id="LC1853" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">#12174</span></span>
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<pre style="margin: 0;">+<span id="LC1854" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data V a</span></span>
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<pre style="margin: 0;">+<span id="LC1855" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T = forall (a :: T). MkT (V a)</span></span>
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<pre style="margin: 0;">+<span id="LC1856" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1857" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The type is recursive (which is fine) but it is recursive /through the</span></span>
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<pre style="margin: 0;">+<span id="LC1858" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">kinds/. In earlier versions of GHC this caused a loop in the compiler</span></span>
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<pre style="margin: 0;">+<span id="LC1859" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(to do with knot-tying) but there is nothing fundamentally wrong with</span></span>
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<pre style="margin: 0;">+<span id="LC1860" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the code (kinds are types, and the recursive declarations are OK). But</span></span>
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<pre style="margin: 0;">+<span id="LC1861" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">it's hard to distinguish "recursion through the kinds" from "recursion</span></span>
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<pre style="margin: 0;">+<span id="LC1862" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">through the types". Consider this (also #11554):</span></span>
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1863
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<pre style="margin: 0;">+<span id="LC1863" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1864" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data PB k (x :: k) = Q</span></span>
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1865
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<pre style="margin: 0;">+<span id="LC1865" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data B :: Type where</span></span>
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<pre style="margin: 0;">+<span id="LC1866" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkB :: P B a -> B</span></span>
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1867
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<pre style="margin: 0;"> <span id="LC1867" class="line" lang="haskell"></span>
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1857
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<pre style="margin: 0;">-<span id="LC1857" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In order to check the constructor B, we need to have the promoted type A, but in</span></span>
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1858
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<pre style="margin: 0;">-<span id="LC1858" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">order to get that promoted type, B must first be checked. To prevent looping, a</span></span>
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1859
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<pre style="margin: 0;">-<span id="LC1859" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">TyConPE promotion error is given when tcTyVar checks an ATcTyCon in kind mode.</span></span>
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1860
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<pre style="margin: 0;">-<span id="LC1860" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Any ATcTyCon is a TyCon being defined in the current recursive group (see data</span></span>
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1861
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<pre style="margin: 0;">-<span id="LC1861" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">type decl for TcTyThing), and all such TyCons are illegal in kinds.</span></span>
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<pre style="margin: 0;">+<span id="LC1868" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here the occurrence of B is not obviously in a kind position.</span></span>
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1862
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1869
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<pre style="margin: 0;"> <span id="LC1869" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1863" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">#11962 proposes checking the head of a data declaration separately from</span></span></span>
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1864
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<pre style="margin: 0;">-<span id="LC1864" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">its constructors. This would allow the example above to pas</span>s.</span></span>
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<pre style="margin: 0;">+<span id="LC1870" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">So now GHC allows all these programs. #12081 and #15942 are other</span></span></span>
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<pre style="margin: 0;">+<span id="LC1871" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">example</span>s.</span></span>
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<pre style="margin: 0;"> <span id="LC1872" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1873" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Body kind of a HsForAllTy]</span></span>
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<pre style="margin: 0;"> <span id="LC1874" 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">@@ -67,3 +67,4 @@ test('T16391a', normal, compile, [''])</td>
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<pre style="margin: 0;"> <span id="LC67" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T16344b</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="LC68" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T16347</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="LC69" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18660</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="LC70" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T12174</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/760307cf5511d970dfddf7fa4b502b4e3394b197#de2534aad704f809011a98e5e6a9eaad78d68453"><strong>testsuite/tests/dependent/should_fail/T12081.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">T12081.hs:9:14: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • Type constructor ‘T’ cannot be used here</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> (it is defined and used in the same recursive group)</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Expected a type, but ‘T n’ has kind ‘Nat’</span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"> • In the kind ‘T n’</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> In the type signature: f :: (a :: T n)</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> In the class declaration for ‘C’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/760307cf5511d970dfddf7fa4b502b4e3394b197#ab29785054df2951e0108758350ff74be5155252"><strong>testsuite/tests/dependent/should_fail/T12174.stderr</strong>
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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">T12174.hs:9:23: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • Type constructor ‘T’ cannot be used here</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> (it is defined and used in the same recursive group)</span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> • In the kind ‘T’</span>
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext"> In the definition of data constructor ‘MkS’</span>
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<pre style="margin: 0;">-<span id="LC7" class="line" lang="plaintext"> In the data declaration for ‘S’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/760307cf5511d970dfddf7fa4b502b4e3394b197#ff9e00d3839a68830e26f2566987483d69b42545"><strong>testsuite/tests/dependent/should_fail/all.T</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -13,7 +13,6 @@ test('T11407', normal, compile_fail, [''])</td>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T11334b</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T11473</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T11471</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">-<span id="LC16" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T12174</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T12081</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T13135</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T13601</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/760307cf5511d970dfddf7fa4b502b4e3394b197#cf234a7e850f12504ae81d73de3dae175441d345"><strong>testsuite/tests/polykinds/T11554.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, PolyKinds, RankNTypes #-}</span></span>
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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, PolyKinds, RankNTypes<span class="idiff left right">, TypeApplications, DataKinds</span> #-}</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;">T11554</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Kind</span></span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">P</span> <span class="p">(</span><span class="n" style="color: #333;">x</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;">Q</span></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="kt" style="color: #458; font-weight: 600;">P1</span> <span class="p">(</span><span class="n" style="color: #333;">x</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;">Q1</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">A1</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">B1</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">A1</span><span class="p">)</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">P1</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;">A1</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="LC9" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">A</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC10" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">B</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">A</span><span class="p">)</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">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;">A</span></span></pre>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">P2</span> <span class="n" style="color: #333;">k</span> <span class="p">(</span><span class="n" style="color: #333;">x</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;">Q2</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="kt" style="color: #458; font-weight: 600;">A2</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">B2</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">P2</span> <span class="kt" style="color: #458; font-weight: 600;">A2</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;">A2</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"></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;">P3</span> <span class="p">(</span><span class="n" style="color: #333;">x</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;">Q3</span></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="kt" style="color: #458; font-weight: 600;">A3</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">B3</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">P3</span> <span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">A3</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;">A3</span></span></pre>
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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">T11554.hs:10:21: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • Type constructor ‘A’ cannot be used here</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> (it is defined and used in the same recursive group)</span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> • In the kind ‘A’</span>
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext"> In the definition of data constructor ‘B’</span>
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<pre style="margin: 0;">-<span id="LC7" class="line" lang="plaintext"> In the data declaration for ‘A’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/760307cf5511d970dfddf7fa4b502b4e3394b197#37bb83d0a916288b2296ba25cdbbef228eed6484"><strong>testsuite/tests/polykinds/all.T</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -148,7 +148,7 @@ test('KindVType', normal, compile_fail, [''])</td>
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<pre style="margin: 0;"> <span id="LC148" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T11821</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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149
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149
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<pre style="margin: 0;"> <span id="LC149" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T11821a</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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150
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150
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<pre style="margin: 0;"> <span id="LC150" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T11640</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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151
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<pre style="margin: 0;">-<span id="LC151" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T11554</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile<span class="idiff left right">_fail</span></span><span class="p">,</span> <span class="p">[''])</span></span>
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151
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<pre style="margin: 0;">+<span id="LC151" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T11554</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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152
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152
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<pre style="margin: 0;"> <span id="LC152" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T12055</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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153
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153
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<pre style="margin: 0;"> <span id="LC153" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T12055a</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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154
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154
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<pre style="margin: 0;"> <span id="LC154" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T12593</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/760307cf5511d970dfddf7fa4b502b4e3394b197#97c29c052ebb329e68d8296b53cbceeb7d540f59"><strong>testsuite/tests/typecheck/should_compile/T15942.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# Language DataKinds #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# Language RankNTypes #-}</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 TypeApplications #-}</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 KindSignatures #-}</span></span>
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6
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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 TypeFamilies #-}</span></span>
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7
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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 AllowAmbiguousTypes #-}</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;">module</span> <span class="nn" style="color: #555;">T15942</span> <span class="kr" style="font-weight: 600;">where</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;">import</span> <span class="nn" style="color: #555;">Data.Kind</span></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;">Data.Proxy</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">G1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">forall</span> <span class="p">(</span><span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</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="LC14" class="line" lang="haskell"></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;">Fun1</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">G1</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="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">F1</span> <span class="p">(</span><span class="n" style="color: #333;">bool</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</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="LC18" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">Not1</span> <span class="n" style="color: #333;">bool</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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19
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"> <span class="n" style="color: #333;">foo1</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Fun1</span> <span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Not1</span> <span class="n" style="color: #333;">bool</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">G2</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;">Type</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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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Fun2</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">G2</span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">F2</span> <span class="p">(</span><span class="n" style="color: #333;">bool</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</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="LC26" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">Not2</span> <span class="n" style="color: #333;">bool</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"> <span class="n" style="color: #333;">foo2</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Proxy</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;">Proxy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Not2</span> <span class="n" style="color: #333;">bool</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/760307cf5511d970dfddf7fa4b502b4e3394b197#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">@@ -722,4 +722,5 @@ test('T18412', normal, compile, [''])</td>
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<pre style="margin: 0;"> <span id="LC722" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18470</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="LC723" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18323</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="LC724" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18585</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">+<span id="LC725" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T15942</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC726" class="line" lang="perl"></span></pre>
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