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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>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/9bbcc3be51180dcefde0c89daf8ad6f69c680b40">9bbcc3be</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-06-23T21:20:41Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor UnliftedNewtypes-relation kind signature validity checks
This fixes three infelicities related to the programs that are
(and aren't) accepted with `UnliftedNewtypes`:
* Enabling `UnliftedNewtypes` would permit newtypes to have return
kind `Id Type`, which had disastrous results (i.e., GHC panics).
* Data family declarations ending in kind `TYPE r` (for some `r`)
weren't being accepted if `UnliftedNewtypes` wasn't enabled,
despite the GHC proposal specifying otherwise.
* GHC wasn't warning about programs that _would_ typecheck if
`UnliftedNewtypes` were enabled in certain common cases.
As part of fixing these issues, I factored out the logic for checking
all of the various properties about data type/data family return
kinds into a single `checkDataKindSig` function. I also cleaned up
some of the formatting in the existing error message that gets
thrown.
Fixes #16821, fixes #16827, and fixes #16829.
</pre>
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<h4>17 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#350c4076427c611b8f14e875a4ca553041c2b847">
compiler/typecheck/TcHsType.hs
</a>
</li>
<li class="file-stats">
<a href="#4c1af4850cb90ab2963edb06b69b57e87ccdf9c1">
compiler/typecheck/TcInstDcls.hs
</a>
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<li class="file-stats">
<a href="#bdfa0cc139f61d1236abc1598c5d684b43c357f9">
compiler/typecheck/TcTyClsDecls.hs
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<li class="file-stats">
<a href="#40d93f06cdb95d1c98a6b3832d0153e59839d832">
docs/users_guide/glasgow_exts.rst
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<li class="file-stats">
<a href="#181ca453a291afedf0b5a96e0f5c660d3321807e">
<span class="new-file">
+
testsuite/tests/typecheck/should_compile/T16827.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="#798d7f02ed1104057ae5ac544e44d9da849966e7">
testsuite/tests/typecheck/should_fail/T14048a.stderr
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<li class="file-stats">
<a href="#377c6dceea298ea0d0549942bab113d6e03ff33c">
testsuite/tests/typecheck/should_fail/T14048b.stderr
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<li class="file-stats">
<a href="#9c35bde37c560379c8aab4a5c55761ddfbf0d67e">
testsuite/tests/typecheck/should_fail/T14048c.stderr
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<li class="file-stats">
<a href="#db97d2e231964bb44ec522c2e3f4dce13f8432e6">
<span class="new-file">
+
testsuite/tests/typecheck/should_fail/T16821.hs
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<li class="file-stats">
<a href="#45f25fd61df2ce92f29266cbb992a1db9c765494">
<span class="new-file">
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testsuite/tests/typecheck/should_fail/T16821.stderr
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<li class="file-stats">
<a href="#9c7f39815d593f66a627efc7e12449ea7b36eef0">
<span class="new-file">
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testsuite/tests/typecheck/should_fail/T16829a.hs
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<li class="file-stats">
<a href="#6d5a4198d0cf7ff1892d25bf2d2fc639698caede">
<span class="new-file">
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testsuite/tests/typecheck/should_fail/T16829a.stderr
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<li class="file-stats">
<a href="#acc0bec10b27de2ec2759b288880bf952660efff">
<span class="new-file">
+
testsuite/tests/typecheck/should_fail/T16829b.hs
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<li class="file-stats">
<a href="#6207baf175f494141c1d73f60473cf27438e6c23">
<span class="new-file">
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testsuite/tests/typecheck/should_fail/T16829b.stderr
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<li class="file-stats">
<a href="#c368f478faa7aa522de0316b8756b0d906bd8cdf">
testsuite/tests/typecheck/should_fail/UnliftedNewtypesConstraintFamily.stderr
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<li class="file-stats">
<a href="#b9e86d897a62509b0114d81d5e736630d6f68f43">
testsuite/tests/typecheck/should_fail/all.T
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<h4>Changes:</h4>
<li id="350c4076427c611b8f14e875a4ca553041c2b847">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/9bbcc3be51180dcefde0c89daf8ad6f69c680b40#350c4076427c611b8f14e875a4ca553041c2b847"><strong>compiler/typecheck/TcHsType.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="49" 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">@@ -49,7 +49,7 @@ module TcHsType (</td>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">kindGeneralize</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkExpectedKind_pp</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"></span>
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<td class="diff-line-num old_line" data-linenumber="51" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Sort-checking kinds</span></span>
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<pre style="margin: 0;">-<span id="LC52" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcLHsKindSig</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left right">badKindSig</span></span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC52" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcLHsKindSig</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left">checkDataKindSig</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">DataSort</span></span><span class="p"><span class="idiff">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">..</span></span><span class="p"><span class="idiff right">)</span>,</span></span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="haskell"></span>
</pre>
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Zonking and promoting</span></span>
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<td class="diff-line-num old_line" data-linenumber="55" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">zonkPromoteType</span><span class="p">,</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="105" 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="105" 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">@@ -105,7 +105,7 @@ import UniqSupply</td>
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<pre style="margin: 0;"> <span id="LC105" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Outputable</span></span>
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<pre style="margin: 0;"> <span id="LC106" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">FastString</span></span>
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<td class="diff-line-num old_line" data-linenumber="107" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC107" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">PrelNames</span> <span class="k" style="font-weight: 600;">hiding</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">wildCardName</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC108" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">DynFlags</span><span class="idiff left"> </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">WarningFlag</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">Opt_WarnPartialTypeSignatures</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">)</span></span></span>
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<td class="diff-line-num new old_line" data-linenumber="109" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC108" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">DynFlags</span></span>
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<pre style="margin: 0;"> <span id="LC109" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="k" style="font-weight: 600;">qualified</span> <span class="nn" style="color: #555;">GHC.LanguageExtensions</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">LangExt</span></span>
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<pre style="margin: 0;"> <span id="LC110" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC111" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Maybes</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">@@ -2405,12 +2405,101 @@ etaExpandAlgTyCon tc_bndrs kind</td>
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<pre style="margin: 0;"> <span id="LC2405" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">subst'</span><span class="p">,</span> <span class="n" style="color: #333;">tv'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substTyVarBndr</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tv</span></span>
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<pre style="margin: 0;"> <span id="LC2406" class="line" lang="haskell"> <span class="n" style="color: #333;">tcb</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Bndr</span> <span class="n" style="color: #333;">tv'</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NamedTCB</span> <span class="n" style="color: #333;">vis</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2407" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2408" class="line" lang="haskell"><span class="n" style="color: #333;">badKindSig</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;">Kind</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="LC2409" class="line" lang="haskell"><span class="n" style="color: #333;">badKindSig</span> <span class="n" style="color: #333;">check_for_type</span> <span class="n" style="color: #333;">kind</span></span>
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<pre style="margin: 0;">-<span id="LC2410" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">sep</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Kind signature on data type declaration has non-*"</span></span>
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<pre style="margin: 0;">-<span id="LC2411" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">check_for_type</span> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">empty</span> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"and non-variable"</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><+></span></span>
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<pre style="margin: 0;">-<span id="LC2412" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"return kind"</span> <span class="p">])</span></span>
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<pre style="margin: 0;">-<span id="LC2413" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">kind</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2408" class="line" lang="haskell"><span class="cd">-- | A description of whether something is a</span></span>
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<pre style="margin: 0;">+<span id="LC2409" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC2410" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * @data@ or @newtype@ ('DataDeclSort')</span></span>
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<pre style="margin: 0;">+<span id="LC2411" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC2412" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * @data instance@ or @newtype instance@ ('DataInstanceSort')</span></span>
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<pre style="margin: 0;">+<span id="LC2413" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC2414" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * @data family@ ('DataFamilySort')</span></span>
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<pre style="margin: 0;">+<span id="LC2415" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC2416" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- At present, this data type is only consumed by 'checkDataKindSig'.</span></span>
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<pre style="margin: 0;">+<span id="LC2417" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">DataSort</span></span>
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<pre style="margin: 0;">+<span id="LC2418" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">DataDeclSort</span> <span class="kt" style="color: #458; font-weight: 600;">NewOrData</span></span>
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2419
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<pre style="margin: 0;">+<span id="LC2419" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">DataInstanceSort</span> <span class="kt" style="color: #458; font-weight: 600;">NewOrData</span></span>
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2420
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<pre style="margin: 0;">+<span id="LC2420" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">DataFamilySort</span></span>
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2421
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<pre style="margin: 0;">+<span id="LC2421" class="line" lang="haskell"></span>
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2422
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<pre style="margin: 0;">+<span id="LC2422" class="line" lang="haskell"><span class="cd">-- | Checks that the return kind in a data declaration's kind signature is</span></span>
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2423
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<pre style="margin: 0;">+<span id="LC2423" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- permissible. There are three cases:</span></span>
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2424
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<pre style="margin: 0;">+<span id="LC2424" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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2425
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<pre style="margin: 0;">+<span id="LC2425" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If dealing with a @data@, @newtype@, @data instance@, or @newtype instance@</span></span>
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2426
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<pre style="margin: 0;">+<span id="LC2426" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- declaration, check that the return kind is @Type@.</span></span>
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2427
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<pre style="margin: 0;">+<span id="LC2427" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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2428
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<pre style="margin: 0;">+<span id="LC2428" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If the declaration is a @newtype@ or @newtype instance@ and the</span></span>
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2429
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<pre style="margin: 0;">+<span id="LC2429" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @UnliftedNewtypes@ extension is enabled, this check is slightly relaxed so</span></span>
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2430
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<pre style="margin: 0;">+<span id="LC2430" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- that a return kind of the form @TYPE r@ (for some @r@) is permitted.</span></span>
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<pre style="margin: 0;">+<span id="LC2431" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See @Note [Implementation of UnliftedNewtypes]@ in "TcTyClsDecls".</span></span>
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2432
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<pre style="margin: 0;">+<span id="LC2432" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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2433
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<pre style="margin: 0;">+<span id="LC2433" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If dealing with a @data family@ declaration, check that the return kind is</span></span>
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2434
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<pre style="margin: 0;">+<span id="LC2434" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- either of the form:</span></span>
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2435
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<pre style="margin: 0;">+<span id="LC2435" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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2436
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<pre style="margin: 0;">+<span id="LC2436" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 1. @TYPE r@ (for some @r@), or</span></span>
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2437
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<pre style="margin: 0;">+<span id="LC2437" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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2438
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<pre style="margin: 0;">+<span id="LC2438" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 2. @k@ (where @k@ is a bare kind variable; see #12369)</span></span>
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2439
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<pre style="margin: 0;">+<span id="LC2439" class="line" lang="haskell"><span class="n" style="color: #333;">checkDataKindSig</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DataSort</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Kind</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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2440
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<pre style="margin: 0;">+<span id="LC2440" class="line" lang="haskell"><span class="n" style="color: #333;">checkDataKindSig</span> <span class="n" style="color: #333;">data_sort</span> <span class="n" style="color: #333;">kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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2441
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<pre style="margin: 0;">+<span id="LC2441" class="line" lang="haskell"> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getDynFlags</span></span>
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2442
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<pre style="margin: 0;">+<span id="LC2442" class="line" lang="haskell"> <span class="n" style="color: #333;">checkTc</span> <span class="p">(</span><span class="n" style="color: #333;">is_TYPE_or_Type</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">is_kind_var</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">err_msg</span> <span class="n" style="color: #333;">dflags</span><span class="p">)</span></span>
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2443
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<pre style="margin: 0;">+<span id="LC2443" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2444
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<pre style="margin: 0;">+<span id="LC2444" class="line" lang="haskell"> <span class="n" style="color: #333;">pp_dec</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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2445
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<pre style="margin: 0;">+<span id="LC2445" class="line" lang="haskell"> <span class="n" style="color: #333;">pp_dec</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="o" style="font-weight: 600;">$</span></span>
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2446
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<pre style="margin: 0;">+<span id="LC2446" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">data_sort</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2447
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<pre style="margin: 0;">+<span id="LC2447" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DataDeclSort</span> <span class="kt" style="color: #458; font-weight: 600;">DataType</span> <span class="o" style="font-weight: 600;">-></span> <span class="s" style="color: #d14;">"data type"</span></span>
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2448
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<pre style="margin: 0;">+<span id="LC2448" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DataDeclSort</span> <span class="kt" style="color: #458; font-weight: 600;">NewType</span> <span class="o" style="font-weight: 600;">-></span> <span class="s" style="color: #d14;">"newtype"</span></span>
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2449
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<pre style="margin: 0;">+<span id="LC2449" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DataInstanceSort</span> <span class="kt" style="color: #458; font-weight: 600;">DataType</span> <span class="o" style="font-weight: 600;">-></span> <span class="s" style="color: #d14;">"data instance"</span></span>
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2450
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<pre style="margin: 0;">+<span id="LC2450" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DataInstanceSort</span> <span class="kt" style="color: #458; font-weight: 600;">NewType</span> <span class="o" style="font-weight: 600;">-></span> <span class="s" style="color: #d14;">"newtype instance"</span></span>
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2451
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<pre style="margin: 0;">+<span id="LC2451" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DataFamilySort</span> <span class="o" style="font-weight: 600;">-></span> <span class="s" style="color: #d14;">"data family"</span></span>
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2452
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<pre style="margin: 0;">+<span id="LC2452" class="line" lang="haskell"></span>
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2453
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<pre style="margin: 0;">+<span id="LC2453" class="line" lang="haskell"> <span class="n" style="color: #333;">is_newtype</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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2454
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<pre style="margin: 0;">+<span id="LC2454" class="line" lang="haskell"> <span class="n" style="color: #333;">is_newtype</span> <span class="o" style="font-weight: 600;">=</span></span>
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2455
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<pre style="margin: 0;">+<span id="LC2455" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">data_sort</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2456
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<pre style="margin: 0;">+<span id="LC2456" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DataDeclSort</span> <span class="n" style="color: #333;">new_or_data</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">new_or_data</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">NewType</span></span>
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<pre style="margin: 0;">+<span id="LC2457" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DataInstanceSort</span> <span class="n" style="color: #333;">new_or_data</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">new_or_data</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">NewType</span></span>
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<pre style="margin: 0;">+<span id="LC2458" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DataFamilySort</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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2459
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<pre style="margin: 0;">+<span id="LC2459" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2460" class="line" lang="haskell"> <span class="n" style="color: #333;">is_data_family</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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2461
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<pre style="margin: 0;">+<span id="LC2461" class="line" lang="haskell"> <span class="n" style="color: #333;">is_data_family</span> <span class="o" style="font-weight: 600;">=</span></span>
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2462
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<pre style="margin: 0;">+<span id="LC2462" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">data_sort</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC2463" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DataDeclSort</span><span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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2464
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<pre style="margin: 0;">+<span id="LC2464" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DataInstanceSort</span><span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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2465
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<pre style="margin: 0;">+<span id="LC2465" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DataFamilySort</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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2466
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<pre style="margin: 0;">+<span id="LC2466" class="line" lang="haskell"></span>
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2467
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<pre style="margin: 0;">+<span id="LC2467" class="line" lang="haskell"> <span class="n" style="color: #333;">tYPE_ok</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>
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2468
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<pre style="margin: 0;">+<span id="LC2468" class="line" lang="haskell"> <span class="n" style="color: #333;">tYPE_ok</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;">=</span></span>
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2469
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<pre style="margin: 0;">+<span id="LC2469" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">is_newtype</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;">UnliftedNewtypes</span> <span class="n" style="color: #333;">dflags</span><span class="p">)</span></span>
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2470
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<pre style="margin: 0;">+<span id="LC2470" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- With UnliftedNewtypes, we allow kinds other than Type, but they</span></span>
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2471
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<pre style="margin: 0;">+<span id="LC2471" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- must still be of the form `TYPE r` since we don't want to accept</span></span>
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2472
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<pre style="margin: 0;">+<span id="LC2472" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Constraint or Nat.</span></span>
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2473
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<pre style="margin: 0;">+<span id="LC2473" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Implementation of UnliftedNewtypes] in TcTyClsDecls.</span></span>
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2474
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<pre style="margin: 0;">+<span id="LC2474" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">is_data_family</span></span>
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<pre style="margin: 0;">+<span id="LC2475" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If this is a `data family` declaration, we don't need to check if</span></span>
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<pre style="margin: 0;">+<span id="LC2476" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- UnliftedNewtypes is enabled, since data family declarations can</span></span>
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2477
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<pre style="margin: 0;">+<span id="LC2477" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- have return kind `TYPE r` unconditionally (#16827).</span></span>
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2478
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<pre style="margin: 0;">+<span id="LC2478" class="line" lang="haskell"></span>
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2479
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<pre style="margin: 0;">+<span id="LC2479" class="line" lang="haskell"> <span class="n" style="color: #333;">is_TYPE</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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2480
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<pre style="margin: 0;">+<span id="LC2480" class="line" lang="haskell"> <span class="n" style="color: #333;">is_TYPE</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcIsRuntimeTypeKind</span> <span class="n" style="color: #333;">kind</span></span>
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2481
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<pre style="margin: 0;">+<span id="LC2481" class="line" lang="haskell"></span>
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2482
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<pre style="margin: 0;">+<span id="LC2482" class="line" lang="haskell"> <span class="n" style="color: #333;">is_TYPE_or_Type</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>
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2483
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<pre style="margin: 0;">+<span id="LC2483" class="line" lang="haskell"> <span class="n" style="color: #333;">is_TYPE_or_Type</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">tYPE_ok</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">is_TYPE</span></span>
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2484
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<pre style="margin: 0;">+<span id="LC2484" 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;">tcIsLiftedTypeKind</span> <span class="n" style="color: #333;">kind</span></span>
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2485
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<pre style="margin: 0;">+<span id="LC2485" class="line" lang="haskell"></span>
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2486
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<pre style="margin: 0;">+<span id="LC2486" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- In the particular case of a data family, permit a return kind of the</span></span>
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2487
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<pre style="margin: 0;">+<span id="LC2487" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- form `:: k` (where `k` is a bare kind variable).</span></span>
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2488
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<pre style="margin: 0;">+<span id="LC2488" class="line" lang="haskell"> <span class="n" style="color: #333;">is_kind_var</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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2489
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<pre style="margin: 0;">+<span id="LC2489" class="line" lang="haskell"> <span class="n" style="color: #333;">is_kind_var</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">is_data_family</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isJust</span> <span class="p">(</span><span class="n" style="color: #333;">tcGetCastedTyVar_maybe</span> <span class="n" style="color: #333;">kind</span><span class="p">)</span></span>
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2490
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<pre style="margin: 0;">+<span id="LC2490" 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="kt" style="color: #458; font-weight: 600;">False</span></span>
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2491
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<pre style="margin: 0;">+<span id="LC2491" class="line" lang="haskell"></span>
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2492
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<pre style="margin: 0;">+<span id="LC2492" class="line" lang="haskell"> <span class="n" style="color: #333;">err_msg</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;">SDoc</span></span>
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2493
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<pre style="margin: 0;">+<span id="LC2493" class="line" lang="haskell"> <span class="n" style="color: #333;">err_msg</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;">=</span></span>
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2494
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<pre style="margin: 0;">+<span id="LC2494" class="line" lang="haskell"> <span class="n" style="color: #333;">sep</span> <span class="p">[</span> <span class="p">(</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;">"Kind signature on"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pp_dec</span> <span class="o" style="font-weight: 600;"><+></span></span>
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2495
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<pre style="margin: 0;">+<span id="LC2495" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"declaration has non-"</span> <span class="o" style="font-weight: 600;"><></span></span>
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2496
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<pre style="margin: 0;">+<span id="LC2496" class="line" lang="haskell"> <span class="p">(</span><span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">tYPE_ok</span> <span class="n" style="color: #333;">dflags</span> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"TYPE"</span> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">liftedTypeKind</span><span class="p">)</span></span>
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2497
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<pre style="margin: 0;">+<span id="LC2497" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">is_data_family</span> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"and non-variable"</span> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">empty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><+></span></span>
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2498
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<pre style="margin: 0;">+<span id="LC2498" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"return kind"</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;">kind</span><span class="p">)</span> <span class="p">])</span></span>
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2499
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<pre style="margin: 0;">+<span id="LC2499" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">tYPE_ok</span> <span class="n" style="color: #333;">dflags</span><span class="p">)</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">is_TYPE</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">is_newtype</span> <span class="o" style="font-weight: 600;">&&</span></span>
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2500
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<pre style="margin: 0;">+<span id="LC2500" class="line" lang="haskell"> <span class="n" style="color: #333;">not</span> <span class="p">(</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;">UnliftedNewtypes</span> <span class="n" style="color: #333;">dflags</span><span class="p">)</span></span>
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2501
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<pre style="margin: 0;">+<span id="LC2501" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Perhaps you intended to use UnliftedNewtypes"</span></span>
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2502
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<pre style="margin: 0;">+<span id="LC2502" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">empty</span> <span class="p">]</span></span>
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2414
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2503
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<pre style="margin: 0;"> <span id="LC2503" class="line" lang="haskell"></span>
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2415
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2504
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<pre style="margin: 0;"> <span id="LC2504" class="line" lang="haskell"><span class="n" style="color: #333;">tcbVisibilities</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;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyConBndrVis</span><span class="p">]</span></span>
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2416
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2505
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<pre style="margin: 0;"> <span id="LC2505" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Result is in 1-1 correpondence with orig_args</span></span>
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<li id="4c1af4850cb90ab2963edb06b69b57e87ccdf9c1">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/9bbcc3be51180dcefde0c89daf8ad6f69c680b40#4c1af4850cb90ab2963edb06b69b57e87ccdf9c1"><strong>compiler/typecheck/TcInstDcls.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">@@ -687,17 +687,7 @@ tcDataFamInstDecl mb_clsinfo</td>
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<pre style="margin: 0;"> <span id="LC687" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we did it before the "extra" tvs from etaExpandAlgTyCon</span></span>
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<pre style="margin: 0;"> <span id="LC688" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- would always be eta-reduced</span></span>
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<pre style="margin: 0;"> <span id="LC689" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">extra_tcbs</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;">etaExpandAlgTyCon</span> <span class="n" style="color: #333;">full_tcbs</span> <span class="n" style="color: #333;">res_kind</span></span>
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<pre style="margin: 0;">-<span id="LC690" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">unlifted_newtypes</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">xoptM</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;">UnliftedNewtypes</span></span>
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<pre style="margin: 0;">-<span id="LC691" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">allowUnlifted</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unlifted_newtypes</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">new_or_data</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">NewType</span></span>
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<pre style="margin: 0;">-<span id="LC692" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- With UnliftedNewtypes, we allow kinds other than Type, but they</span></span>
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<pre style="margin: 0;">-<span id="LC693" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- must still be of the form `TYPE r` since we don't want to accept</span></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;">-- Constraint or Nat. See Note [Implementation of UnliftedNewtypes].</span></span>
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<pre style="margin: 0;">-<span id="LC695" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">checkTc</span></span>
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<pre style="margin: 0;">-<span id="LC696" class="line" lang="haskell"> <span class="p">(</span><span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">allowUnlifted</span></span>
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<pre style="margin: 0;">-<span id="LC697" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">tcIsRuntimeTypeKind</span> <span class="n" style="color: #333;">final_res_kind</span></span>
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<pre style="margin: 0;">-<span id="LC698" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">tcIsLiftedTypeKind</span> <span class="n" style="color: #333;">final_res_kind</span></span>
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<pre style="margin: 0;">-<span id="LC699" class="line" lang="haskell"> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC700" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">badKindSig</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="n" style="color: #333;">res_kind</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC690" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">checkDataKindSig</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DataInstanceSort</span> <span class="n" style="color: #333;">new_or_data</span><span class="p">)</span> <span class="n" style="color: #333;">final_res_kind</span></span>
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<pre style="margin: 0;"> <span id="LC691" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">extra_pats</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyVarTy</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">binderVar</span><span class="p">)</span> <span class="n" style="color: #333;">extra_tcbs</span></span>
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<pre style="margin: 0;"> <span id="LC692" class="line" lang="haskell"> <span class="n" style="color: #333;">all_pats</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pats</span> <span class="p">`</span><span class="n" style="color: #333;">chkAppend</span><span class="p">`</span> <span class="n" style="color: #333;">extra_pats</span></span>
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<pre style="margin: 0;"> <span id="LC693" 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;">mkTyConApp</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">all_pats</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">@@ -1877,15 +1877,7 @@ tcFamDecl1 parent (FamilyDecl { fdInfo = fam_info</td>
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<pre style="margin: 0;"> <span id="LC1877" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- When UnliftedNewtypes is enabled, we loosen this restriction</span></span>
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<pre style="margin: 0;"> <span id="LC1878" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- on the return kind. See Note [Implementation of UnliftedNewtypes], wrinkle (1).</span></span>
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<pre style="margin: 0;"> <span id="LC1879" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">final_res_kind</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitPiTys</span> <span class="n" style="color: #333;">res_kind</span></span>
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<pre style="margin: 0;">-<span id="LC1880" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">unlifted_newtypes</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">xoptM</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;">UnliftedNewtypes</span></span>
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<pre style="margin: 0;">-<span id="LC1881" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">checkTc</span></span>
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1882
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<pre style="margin: 0;">-<span id="LC1882" class="line" lang="haskell"> <span class="p">(</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">unlifted_newtypes</span></span>
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<pre style="margin: 0;">-<span id="LC1883" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">tcIsRuntimeTypeKind</span> <span class="n" style="color: #333;">final_res_kind</span></span>
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1884
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<pre style="margin: 0;">-<span id="LC1884" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">tcIsLiftedTypeKind</span> <span class="n" style="color: #333;">final_res_kind</span></span>
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<pre style="margin: 0;">-<span id="LC1885" class="line" lang="haskell"> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1886" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">isJust</span> <span class="p">(</span><span class="n" style="color: #333;">tcGetCastedTyVar_maybe</span> <span class="n" style="color: #333;">final_res_kind</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1887" class="line" lang="haskell"> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1888" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">badKindSig</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="n" style="color: #333;">res_kind</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1880" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">checkDataKindSig</span> <span class="kt" style="color: #458; font-weight: 600;">DataFamilySort</span> <span class="n" style="color: #333;">final_res_kind</span></span>
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<pre style="margin: 0;"> <span id="LC1881" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tc_rep_name</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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1882
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<pre style="margin: 0;"> <span id="LC1882" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">tycon</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkFamilyTyCon</span> <span class="n" style="color: #333;">tc_name</span> <span class="n" style="color: #333;">binders</span></span>
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1891
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<pre style="margin: 0;"> <span id="LC1883" class="line" lang="haskell"> <span class="n" style="color: #333;">res_kind</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">@@ -2033,15 +2025,8 @@ tcDataDefn roles_info</td>
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2025
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<pre style="margin: 0;"> <span id="LC2025" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tcg_env</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getGblEnv</span></span>
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2034
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2026
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<pre style="margin: 0;"> <span id="LC2026" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">extra_bndrs</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;">etaExpandAlgTyCon</span> <span class="n" style="color: #333;">tycon_binders</span> <span class="n" style="color: #333;">res_kind</span></span>
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2035
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2027
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<pre style="margin: 0;"> <span id="LC2027" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">hsc_src</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcg_src</span> <span class="n" style="color: #333;">tcg_env</span></span>
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2036
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<pre style="margin: 0;">-<span id="LC2036" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">unlifted_newtypes</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">xoptM</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;">UnliftedNewtypes</span></span>
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2037
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<pre style="margin: 0;">-<span id="LC2037" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">allowUnlifted</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unlifted_newtypes</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">new_or_data</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">NewType</span></span>
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2038
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<pre style="margin: 0;">-<span id="LC2038" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">unless</span> <span class="p">(</span><span class="n" style="color: #333;">mk_permissive_kind</span> <span class="n" style="color: #333;">hsc_src</span> <span class="n" style="color: #333;">cons</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">allowUnlifted</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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2039
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<pre style="margin: 0;">-<span id="LC2039" class="line" lang="haskell"> <span class="n" style="color: #333;">checkTc</span></span>
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2040
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<pre style="margin: 0;">-<span id="LC2040" class="line" lang="haskell"> <span class="p">(</span><span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">allowUnlifted</span></span>
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2041
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<pre style="margin: 0;">-<span id="LC2041" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">tcIsRuntimeTypeKind</span> <span class="n" style="color: #333;">final_res_kind</span></span>
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2042
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<pre style="margin: 0;">-<span id="LC2042" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">tcIsLiftedTypeKind</span> <span class="n" style="color: #333;">final_res_kind</span></span>
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2043
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<pre style="margin: 0;">-<span id="LC2043" class="line" lang="haskell"> <span class="p">)</span></span>
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2044
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<pre style="margin: 0;">-<span id="LC2044" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">badKindSig</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="n" style="color: #333;">res_kind</span><span class="p">)</span></span>
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2028
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<pre style="margin: 0;">+<span id="LC2028" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">unless</span> <span class="p">(</span><span class="n" style="color: #333;">mk_permissive_kind</span> <span class="n" style="color: #333;">hsc_src</span> <span class="n" style="color: #333;">cons</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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2029
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<pre style="margin: 0;">+<span id="LC2029" class="line" lang="haskell"> <span class="n" style="color: #333;">checkDataKindSig</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DataDeclSort</span> <span class="n" style="color: #333;">new_or_data</span><span class="p">)</span> <span class="n" style="color: #333;">final_res_kind</span></span>
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2045
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2030
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<pre style="margin: 0;"> <span id="LC2030" class="line" lang="haskell"></span>
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2046
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2031
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<pre style="margin: 0;"> <span id="LC2031" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">stupid_tc_theta</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pushTcLevelM_</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">solveEqualities</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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2047
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2032
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<pre style="margin: 0;"> <span id="LC2032" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">stupid_theta</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkTcTypesToTypes</span> <span class="n" style="color: #333;">stupid_tc_theta</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">@@ -2077,7 +2062,12 @@ tcDataDefn roles_info</td>
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2077
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2062
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<pre style="margin: 0;"> <span id="LC2062" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2078
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2063
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<pre style="margin: 0;"> <span id="LC2063" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Abstract data types in hsig files can have arbitrary kinds,</span></span>
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2079
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2064
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<pre style="margin: 0;"> <span id="LC2064" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- because they may be implemented by type synonyms</span></span>
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2080
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<pre style="margin: 0;">-<span id="LC2080" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (which themselves can have arbitrary kinds, not just *)</span></span>
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2065
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<pre style="margin: 0;">+<span id="LC2065" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (which themselves can have arbitrary kinds, not just *). See #13955.</span></span>
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2066
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<pre style="margin: 0;">+<span id="LC2066" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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2067
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<pre style="margin: 0;">+<span id="LC2067" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note that this is only a property that data type declarations possess,</span></span>
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2068
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<pre style="margin: 0;">+<span id="LC2068" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- so one could not have, say, a data family instance in an hsig file that</span></span>
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2069
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<pre style="margin: 0;">+<span id="LC2069" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- has kind `Bool`. Therfore, this check need only occur in the code that</span></span>
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2070
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<pre style="margin: 0;">+<span id="LC2070" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- typechecks data type declarations.</span></span>
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2071
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<pre style="margin: 0;"> <span id="LC2071" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_permissive_kind</span> <span class="kt" style="color: #458; font-weight: 600;">HsigFile</span> <span class="kt" style="color: #458; font-weight: 600;">[]</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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2082
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2072
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<pre style="margin: 0;"> <span id="LC2072" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_permissive_kind</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 class="kt" style="color: #458; font-weight: 600;">False</span></span>
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2073
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<pre style="margin: 0;"> <span id="LC2073" 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">@@ -2600,7 +2590,7 @@ tcConDecl rep_tycon tag_map tmpl_bndrs _res_kind res_tmpl new_or_data</td>
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2600
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2590
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<pre style="margin: 0;"> <span id="LC2590" 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;">tcConArgs</span> <span class="n" style="color: #333;">hs_args</span></span>
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2601
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2591
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<pre style="margin: 0;"> <span id="LC2591" 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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2602
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2592
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<pre style="margin: 0;"> <span id="LC2592" 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;">tcHsOpenType</span> <span class="n" style="color: #333;">hs_res_ty</span></span>
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2603
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<pre style="margin: 0;">-<span id="LC2603" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Implementation of <span class="idiff left right">unlifted n</span>ewtypes]</span></span>
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<pre style="margin: 0;">+<span id="LC2593" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Implementation of <span class="idiff left right">UnliftedN</span>ewtypes]</span></span>
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2604
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2594
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<pre style="margin: 0;"> <span id="LC2594" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getDynFlags</span></span>
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2595
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<pre style="margin: 0;"> <span id="LC2595" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">final_arg_tys</span> <span class="o" style="font-weight: 600;"><-</span></span>
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<pre style="margin: 0;"> <span id="LC2596" class="line" lang="haskell"> <span class="n" style="color: #333;">unifyNewtypeKind</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">new_or_data</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/9bbcc3be51180dcefde0c89daf8ad6f69c680b40#40d93f06cdb95d1c98a6b3832d0153e59839d832"><strong>docs/users_guide/glasgow_exts.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">@@ -179,7 +179,7 @@ There are some restrictions on the use of primitive types:</td>
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<pre style="margin: 0;"> <span id="LC179" class="line" lang="mosel"><span class="s1" style="color: #d14;"> newtype A = MkA Int#</span></span>
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<pre style="margin: 0;"> <span id="LC180" class="line" lang="mosel"></span>
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<pre style="margin: 0;"> <span id="LC181" class="line" lang="mosel"><span class="s1" style="color: #d14;"> However, this restriction can be relaxed by enabling</span></span>
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<pre style="margin: 0;">-<span id="LC182" class="line" lang="mosel"><span class="s1" style="color: #d14;"> :extension:`<span class="idiff left right">-X</span>UnliftedNewtypes`. The `section on unlifted newtypes</span></span>
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<pre style="margin: 0;">+<span id="LC182" class="line" lang="mosel"><span class="s1" style="color: #d14;"> :extension:`UnliftedNewtypes`. The `section on unlifted newtypes</span></span>
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<pre style="margin: 0;"> <span id="LC183" class="line" lang="mosel"><span class="s1" style="color: #d14;"> <#unlifted-newtypes>`__ details the behavior of such types.</span></span>
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<pre style="margin: 0;"> <span id="LC184" class="line" lang="mosel"></span>
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<pre style="margin: 0;"> <span id="LC185" class="line" lang="mosel"><span class="s1" style="color: #d14;">- You cannot bind a variable with an unboxed type in a *top-level*</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">@@ -375,7 +375,9 @@ Unlifted Newtypes</td>
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<pre style="margin: 0;"> <span id="LC375" class="line" lang="mosel"></span>
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<pre style="margin: 0;"> <span id="LC376" class="line" lang="mosel"><span class="s1" style="color: #d14;"> Enable the use of newtypes over types with non-lifted runtime representations.</span></span>
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<pre style="margin: 0;"> <span id="LC377" class="line" lang="mosel"></span>
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<pre style="margin: 0;">-<span id="LC378" class="line" lang="mosel"><span class="s1" style="color: #d14;">``-XUnliftedNewtypes`` relaxes the restrictions around what types can appear inside</span></span>
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<pre style="margin: 0;">+<span id="LC378" class="line" lang="mosel"><span class="s1" style="color: #d14;">GHC implements an :extension:`UnliftedNewtypes` extension as specified in</span></span>
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<pre style="margin: 0;">+<span id="LC379" class="line" lang="mosel"><span class="s1" style="color: #d14;">`this GHC proposal <https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0013-unlifted-newtypes.rst>`_.</span></span>
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<pre style="margin: 0;">+<span id="LC380" class="line" lang="mosel"><span class="s1" style="color: #d14;">:extension:`UnliftedNewtypes` relaxes the restrictions around what types can appear inside</span></span>
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<pre style="margin: 0;"> <span id="LC381" class="line" lang="mosel"><span class="s1" style="color: #d14;">of a `newtype`. For example, the type ::</span></span>
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<pre style="margin: 0;"> <span id="LC382" class="line" lang="mosel"></span>
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<pre style="margin: 0;"> <span id="LC383" class="line" lang="mosel"><span class="s1" style="color: #d14;"> newtype A = MkA Int#</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">@@ -410,28 +412,28 @@ And with `UnboxedSums <#unboxed-sums>`__ enabled ::</td>
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<pre style="margin: 0;"> <span id="LC412" class="line" lang="mosel"><span class="s1" style="color: #d14;"> newtype Maybe# :: forall (r :: RuntimeRep). TYPE r -> TYPE (SumRep '</span><span class="p">[</span><span class="n" style="color: #333;">r</span><span class="p">,</span> <span class="n" style="color: #333;">TupleRep</span> <span class="s1" style="color: #d14;">'[]]) where</span></span>
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<pre style="margin: 0;"> <span id="LC413" class="line" lang="mosel"><span class="s1" style="color: #d14;"> MkMaybe# :: forall (r :: RuntimeRep) (a :: TYPE r). (# a | (# #) #) -> Maybe# a</span></span>
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<pre style="margin: 0;"> <span id="LC414" class="line" lang="mosel"></span>
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<pre style="margin: 0;">-<span id="LC413" class="line" lang="mosel"><span class="s1" style="color: #d14;">This extension also relaxes some of the restrictions around data families.</span></span>
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<pre style="margin: 0;">-<span id="LC414" class="line" lang="mosel"><span class="s1" style="color: #d14;">It must be enabled in modules where either of the following occur:</span></span>
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<pre style="margin: 0;">-<span id="LC415" class="line" lang="mosel"></span>
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<pre style="margin: 0;">-<span id="LC416" class="line" lang="mosel"><span class="s1" style="color: #d14;">- A data family is declared with a kind other than ``Type``. Both ``Foo``</span></span>
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<pre style="margin: 0;">-<span id="LC417" class="line" lang="mosel"><span class="s1" style="color: #d14;"> and ``Bar``, defined below, fall into this category:</span></span>
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<pre style="margin: 0;">-<span id="LC418" class="line" lang="mosel"><span class="s1" style="color: #d14;"> ::</span></span>
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<pre style="margin: 0;">+<span id="LC415" class="line" lang="mosel"><span class="s1" style="color: #d14;">This extension also relaxes some of the restrictions around data family</span></span>
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<pre style="margin: 0;">+<span id="LC416" class="line" lang="mosel"><span class="s1" style="color: #d14;">instances. In particular, :extension:`UnliftedNewtypes` permits a</span></span>
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<pre style="margin: 0;">+<span id="LC417" class="line" lang="mosel"><span class="s1" style="color: #d14;">``newtype instance`` to be given a return kind of ``TYPE r``, not just</span></span>
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<pre style="margin: 0;">+<span id="LC418" class="line" lang="mosel"><span class="s1" style="color: #d14;">``Type``. For example, the following ``newtype instance`` declarations would be</span></span>
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<pre style="margin: 0;">+<span id="LC419" class="line" lang="mosel"><span class="s1" style="color: #d14;">permitted: ::</span></span>
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<pre style="margin: 0;"> <span id="LC420" class="line" lang="mosel"></span>
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<pre style="margin: 0;"> <span id="LC421" class="line" lang="mosel"><span class="s1" style="color: #d14;"> class Foo a where</span></span>
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<pre style="margin: 0;"> <span id="LC422" class="line" lang="mosel"><span class="s1" style="color: #d14;"> data FooKey a :: TYPE '</span><span class="n" style="color: #333;">IntRep</span></span>
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<pre style="margin: 0;"> <span id="LC423" class="line" lang="mosel"> <span class="n" style="color: #333;">class</span> <span class="n" style="color: #333;">Bar</span> <span class="p">(</span><span class="n" style="color: #333;">r</span> <span class="p">::</span> <span class="n" style="color: #333;">RuntimeRep</span><span class="p">)</span> <span class="n" style="color: #333;">where</span></span>
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<pre style="margin: 0;"> <span id="LC424" class="line" lang="mosel"> <span class="n" style="color: #333;">data</span> <span class="n" style="color: #333;">BarType</span> <span class="n" style="color: #333;">r</span> <span class="p">::</span> <span class="n" style="color: #333;">TYPE</span> <span class="n" style="color: #333;">r</span></span>
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<pre style="margin: 0;"> <span id="LC425" class="line" lang="mosel"></span>
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<pre style="margin: 0;">-<span id="LC425" class="line" lang="mosel"><span class="p">-</span> <span class="n" style="color: #333;">A</span> <span class="p">``</span><span class="n" style="color: #333;">newtype</span> <span class="n" style="color: #333;">instance</span><span class="p">``</span> <span class="n" style="color: #333;">is</span> <span class="n" style="color: #333;">written</span> <span class="k" style="font-weight: 600;">with</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">kind</span> <span class="n" style="color: #333;">other</span> <span class="n" style="color: #333;">than</span> <span class="p">``</span><span class="n" style="color: #333;">Type</span><span class="p">``.</span> <span class="n" style="color: #333;">The</span></span>
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<pre style="margin: 0;">-<span id="LC426" class="line" lang="mosel"> <span class="n" style="color: #333;">following</span> <span class="n" style="color: #333;">instances</span> <span class="k" style="font-weight: 600;">of</span> <span class="p">``</span><span class="n" style="color: #333;">Foo</span><span class="p">``</span> <span class="k" style="font-weight: 600;">and</span> <span class="p">``</span><span class="n" style="color: #333;">Bar</span><span class="p">``</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">defined</span> <span class="n" style="color: #333;">above</span> <span class="n" style="color: #333;">fall</span> <span class="n" style="color: #333;">into</span></span>
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<pre style="margin: 0;">-<span id="LC427" class="line" lang="mosel"> <span class="n" style="color: #333;">this</span> <span class="n" style="color: #333;">category</span><span class="p">.</span></span>
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<pre style="margin: 0;">-<span id="LC428" class="line" lang="mosel"> <span class="p">::</span></span>
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<pre style="margin: 0;">-<span id="LC429" class="line" lang="mosel"></span>
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<pre style="margin: 0;"> <span id="LC426" class="line" lang="mosel"> <span class="n" style="color: #333;">instance</span> <span class="n" style="color: #333;">Foo</span> <span class="n" style="color: #333;">Bool</span> <span class="n" style="color: #333;">where</span></span>
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<pre style="margin: 0;"> <span id="LC427" class="line" lang="mosel"> <span class="n" style="color: #333;">newtype</span> <span class="n" style="color: #333;">FooKey</span> <span class="n" style="color: #333;">Bool</span> <span class="p">=</span> <span class="n" style="color: #333;">FooKeyBoolC</span> <span class="n" style="color: #333;">Int</span><span class="p">#</span></span>
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<pre style="margin: 0;"> <span id="LC428" class="line" lang="mosel"> <span class="n" style="color: #333;">instance</span> <span class="n" style="color: #333;">Bar</span> <span class="s1" style="color: #d14;">'WordRep where</span></span>
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<pre style="margin: 0;"> <span id="LC429" class="line" lang="mosel"><span class="s1" style="color: #d14;"> newtype BarType '</span><span class="n" style="color: #333;">WordRep</span> <span class="p">=</span> <span class="n" style="color: #333;">BarTypeWordRepC</span> <span class="n" style="color: #333;">Word</span><span class="p">#</span></span>
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<pre style="margin: 0;"> <span id="LC430" class="line" lang="mosel"></span>
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<pre style="margin: 0;">+<span id="LC431" class="line" lang="mosel"><span class="n" style="color: #333;">It</span> <span class="n" style="color: #333;">is</span> <span class="n" style="color: #333;">worth</span> <span class="n" style="color: #333;">noting</span> <span class="n" style="color: #333;">that</span> <span class="p">:</span><span class="n" style="color: #333;">extension</span><span class="p">:`</span><span class="n" style="color: #333;">UnliftedNewtypes</span><span class="p">`</span> <span class="n" style="color: #333;">is</span> <span class="p">*</span><span class="k" style="font-weight: 600;">not</span><span class="p">*</span> <span class="n" style="color: #333;">required</span> <span class="k" style="font-weight: 600;">to</span> <span class="n" style="color: #333;">give</span></span>
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<pre style="margin: 0;">+<span id="LC432" class="line" lang="mosel"><span class="n" style="color: #333;">the</span> <span class="n" style="color: #333;">data</span> <span class="n" style="color: #333;">families</span> <span class="n" style="color: #333;">themselves</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">kinds</span> <span class="n" style="color: #333;">involving</span> <span class="p">``</span><span class="n" style="color: #333;">TYPE</span><span class="p">``,</span> <span class="n" style="color: #333;">such</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">the</span></span>
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<pre style="margin: 0;">+<span id="LC433" class="line" lang="mosel"><span class="p">``</span><span class="n" style="color: #333;">FooKey</span><span class="p">``</span> <span class="k" style="font-weight: 600;">and</span> <span class="p">``</span><span class="n" style="color: #333;">BarType</span><span class="p">``</span> <span class="n" style="color: #333;">examples</span> <span class="n" style="color: #333;">above</span><span class="p">.</span> <span class="n" style="color: #333;">The</span> <span class="n" style="color: #333;">extension</span> <span class="n" style="color: #333;">is</span></span>
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<pre style="margin: 0;">+<span id="LC434" class="line" lang="mosel"><span class="n" style="color: #333;">only</span> <span class="n" style="color: #333;">required</span> <span class="n" style="color: #333;">for</span> <span class="p">``</span><span class="n" style="color: #333;">newtype</span> <span class="n" style="color: #333;">instance</span><span class="p">``</span> <span class="k" style="font-weight: 600;">declarations</span><span class="p">,</span> <span class="n" style="color: #333;">such</span> <span class="k" style="font-weight: 600;">as</span> <span class="p">``</span><span class="n" style="color: #333;">FooKeyBoolC</span><span class="p">``</span></span>
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<pre style="margin: 0;">+<span id="LC435" class="line" lang="mosel"><span class="k" style="font-weight: 600;">and</span> <span class="p">``</span><span class="n" style="color: #333;">BarTypeWorkRepC</span><span class="p">``</span> <span class="n" style="color: #333;">above</span><span class="p">.</span></span>
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<pre style="margin: 0;"> <span id="LC437" class="line" lang="mosel"><span class="n" style="color: #333;">This</span> <span class="n" style="color: #333;">extension</span> <span class="n" style="color: #333;">impacts</span> <span class="n" style="color: #333;">the</span> <span class="n" style="color: #333;">determination</span> <span class="k" style="font-weight: 600;">of</span> <span class="n" style="color: #333;">whether</span> <span class="k" style="font-weight: 600;">or</span> <span class="k" style="font-weight: 600;">not</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">newtype</span> <span class="n" style="color: #333;">has</span></span>
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<pre style="margin: 0;"> <span id="LC438" class="line" lang="mosel"><span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">Complete</span> <span class="n" style="color: #333;">User</span><span class="p">-</span><span class="n" style="color: #333;">Specified</span> <span class="n" style="color: #333;">Kind</span> <span class="n" style="color: #333;">Signature</span> <span class="p">(</span><span class="n" style="color: #333;">CUSK</span><span class="p">).</span> <span class="n" style="color: #333;">The</span> <span class="n" style="color: #333;">exact</span> <span class="n" style="color: #333;">impact</span> <span class="n" style="color: #333;">is</span> <span class="n" style="color: #333;">specified</span></span>
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<pre style="margin: 0;"> <span id="LC439" class="line" lang="mosel"><span class="p">`</span><span class="n" style="color: #333;">the</span> <span class="n" style="color: #333;">section</span> <span class="n" style="color: #333;">on</span> <span class="n" style="color: #333;">CUSKs</span> <span class="p"><#</span><span class="n" style="color: #333;">complete</span><span class="p">-</span><span class="n" style="color: #333;">kind</span><span class="p">-</span><span class="n" style="color: #333;">signatures</span><span class="p">>`</span><span class="n" style="color: #333;">__</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">@@ -7650,9 +7652,26 @@ entirely optional, so that we can declare ``Array`` alternatively with ::</td>
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<pre style="margin: 0;"> <span id="LC7652" class="line" lang="mosel"><span class="s1" style="color: #d14;"> data family Array :: Type -> Type</span></span>
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<pre style="margin: 0;"> <span id="LC7653" class="line" lang="mosel"></span>
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<pre style="margin: 0;"> <span id="LC7654" class="line" lang="mosel"><span class="s1" style="color: #d14;">Unlike with ordinary data definitions, the result kind of a data family</span></span>
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<pre style="margin: 0;">-<span id="LC7653" class="line" lang="mosel"><span class="s1" style="color: #d14;">does not need to be ``Type``: it can alternatively be a kind variable</span></span>
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<pre style="margin: 0;">-<span id="LC7654" class="line" lang="mosel"><span class="s1" style="color: #d14;">(with :extension:`PolyKinds`). Data instances'</span> <span class="n" style="color: #333;">kinds</span> <span class="n" style="color: #333;">must</span> <span class="k" style="font-weight: 600;">end</span> <span class="k" style="font-weight: 600;">in</span></span>
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<pre style="margin: 0;">-<span id="LC7655" class="line" lang="mosel"><span class="p">``</span><span class="n" style="color: #333;">Type</span><span class="p">``,</span> <span class="n" style="color: #333;">however</span><span class="p">.</span></span>
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<pre style="margin: 0;">+<span id="LC7655" class="line" lang="mosel"><span class="s1" style="color: #d14;">does not need to be ``Type``. It can alternatively be:</span></span>
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<pre style="margin: 0;">+<span id="LC7656" class="line" lang="mosel"></span>
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<pre style="margin: 0;">+<span id="LC7657" class="line" lang="mosel"><span class="s1" style="color: #d14;">* Of the form ``TYPE r`` for some ``r`` (see :ref:`runtime-rep`).</span></span>
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<pre style="margin: 0;">+<span id="LC7658" class="line" lang="mosel"><span class="s1" style="color: #d14;"> For example: ::</span></span>
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<pre style="margin: 0;">+<span id="LC7659" class="line" lang="mosel"></span>
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<pre style="margin: 0;">+<span id="LC7660" class="line" lang="mosel"><span class="s1" style="color: #d14;"> data family DF1 :: TYPE IntRep</span></span>
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<pre style="margin: 0;">+<span id="LC7661" class="line" lang="mosel"><span class="s1" style="color: #d14;"> data family DF2 (r :: RuntimeRep) :: TYPE r</span></span>
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<pre style="margin: 0;">+<span id="LC7662" class="line" lang="mosel"><span class="s1" style="color: #d14;"> data family DF3 :: Type -> TYPE WordRep</span></span>
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<pre style="margin: 0;">+<span id="LC7664" class="line" lang="mosel"><span class="s1" style="color: #d14;">* A bare kind variable (with :extension:`PolyKinds` enabled).</span></span>
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<pre style="margin: 0;">+<span id="LC7665" class="line" lang="mosel"><span class="s1" style="color: #d14;"> For example: ::</span></span>
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<pre style="margin: 0;">+<span id="LC7667" class="line" lang="mosel"><span class="s1" style="color: #d14;"> data family DF4 :: k</span></span>
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<pre style="margin: 0;">+<span id="LC7668" class="line" lang="mosel"><span class="s1" style="color: #d14;"> data family DF5 (a :: k) :: k</span></span>
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<pre style="margin: 0;">+<span id="LC7669" class="line" lang="mosel"><span class="s1" style="color: #d14;"> data family DF6 :: (k -> Type) -> k</span></span>
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<pre style="margin: 0;">+<span id="LC7671" class="line" lang="mosel"><span class="s1" style="color: #d14;">Data instances'</span> <span class="n" style="color: #333;">kinds</span> <span class="n" style="color: #333;">must</span> <span class="k" style="font-weight: 600;">end</span> <span class="k" style="font-weight: 600;">in</span> <span class="p">``</span><span class="n" style="color: #333;">Type</span><span class="p">``,</span> <span class="n" style="color: #333;">however</span><span class="p">.</span> <span class="n" style="color: #333;">This</span> <span class="n" style="color: #333;">restriction</span> <span class="n" style="color: #333;">is</span></span>
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<pre style="margin: 0;">+<span id="LC7672" class="line" lang="mosel"><span class="n" style="color: #333;">slightly</span> <span class="n" style="color: #333;">relaxed</span> <span class="n" style="color: #333;">when</span> <span class="n" style="color: #333;">the</span> <span class="p">:</span><span class="n" style="color: #333;">extension</span><span class="p">:`</span><span class="n" style="color: #333;">UnliftedNewtypes</span><span class="p">`</span> <span class="n" style="color: #333;">extension</span> <span class="n" style="color: #333;">is</span> <span class="n" style="color: #333;">enabled</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC7673" class="line" lang="mosel"><span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">it</span> <span class="n" style="color: #333;">permits</span> <span class="n" style="color: #333;">a</span> <span class="p">``</span><span class="n" style="color: #333;">newtype</span> <span class="n" style="color: #333;">instance</span><span class="p">``</span><span class="s1" style="color: #d14;">'s kind to end in ``TYPE r`` for some</span></span>
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<pre style="margin: 0;">+<span id="LC7674" class="line" lang="mosel"><span class="s1" style="color: #d14;">``r``.</span></span>
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<pre style="margin: 0;"> <span id="LC7675" class="line" lang="mosel"></span>
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<pre style="margin: 0;"> <span id="LC7676" class="line" lang="mosel"><span class="s1" style="color: #d14;">.. _data-instance-declarations:</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/9bbcc3be51180dcefde0c89daf8ad6f69c680b40#181ca453a291afedf0b5a96e0f5c660d3321807e"><strong>testsuite/tests/typecheck/should_compile/T16827.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 TypeFamilies #-}</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;">T16827</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 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="LC7" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">Foo</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="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TYPE</span> <span class="sc" style="color: #d14;">'I</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">n</span><span class="n" style="color: #333;">tRep</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/9bbcc3be51180dcefde0c89daf8ad6f69c680b40#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">@@ -673,6 +673,7 @@ test('T16225', normal, compile, [''])</td>
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<pre style="margin: 0;"> <span id="LC673" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'T13951'</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="s" style="color: #d14;">''</span><span class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC674" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'T16411'</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="s" style="color: #d14;">''</span><span class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC675" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'T16609'</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="s" style="color: #d14;">''</span><span class="p">])</span></span>
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<pre style="margin: 0;">+<span id="LC676" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'T16827'</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="s" style="color: #d14;">''</span><span class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC677" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'T505'</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="s" style="color: #d14;">''</span><span class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC678" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'T12928'</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="s" style="color: #d14;">''</span><span class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC679" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'UnliftedNewtypesGnd'</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="s" style="color: #d14;">''</span><span class="p">])</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/9bbcc3be51180dcefde0c89daf8ad6f69c680b40#798d7f02ed1104057ae5ac544e44d9da849966e7"><strong>testsuite/tests/typecheck/should_fail/T14048a.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">T14048a.hs:6:1: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • Kind signature on data type declaration has non-*<span class="idiff left right"> return kind</span></span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> <span class="idiff left right"> Constraint</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Kind signature on data type declaration has non-*</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> <span class="idiff left right">return kind ‘Constraint’</span></span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> • In the data declaration for ‘Foo’</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">T14048b.hs:7:1: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • Kind signature on data type declaration has non-*</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> and non-variable return kind</span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> Constraint</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Kind signature on data family declaration has non-TYPE</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> and non-variable return kind ‘Constraint’</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> • In the data family declaration for ‘Foo’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/9bbcc3be51180dcefde0c89daf8ad6f69c680b40#9c35bde37c560379c8aab4a5c55761ddfbf0d67e"><strong>testsuite/tests/typecheck/should_fail/T14048c.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">T14048c.hs:9:1: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • Kind signature on data <span class="idiff left right">type declaration has non-* return kind</span></span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> <span class="idiff left right"> Constraint</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Kind signature on data <span class="idiff left right">instance declaration has non-*</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> <span class="idiff left right">return kind ‘Constraint’</span></span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> • In the data instance declaration for ‘Foo’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/9bbcc3be51180dcefde0c89daf8ad6f69c680b40#db97d2e231964bb44ec522c2e3f4dce13f8432e6"><strong>testsuite/tests/typecheck/should_fail/T16821.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 GADTs #-}</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 UnliftedNewtypes #-}</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T16821</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC7" 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="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;">type</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">Id</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="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;">Id</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">x</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;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</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;">MkT</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">T</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="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">T</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MkT</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkT</span> <span class="p">(</span><span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">+</span> <span class="mi" style="color: #099;">1</span><span class="p">)</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/9bbcc3be51180dcefde0c89daf8ad6f69c680b40#45f25fd61df2ce92f29266cbb992a1db9c765494"><strong>testsuite/tests/typecheck/should_fail/T16821.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T16821.hs:12:1: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Kind signature on newtype declaration has non-TYPE</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> return kind ‘Id *’</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> • In the newtype declaration for ‘T’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/9bbcc3be51180dcefde0c89daf8ad6f69c680b40#9c7f39815d593f66a627efc7e12449ea7b36eef0"><strong>testsuite/tests/typecheck/should_fail/T16829a.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 GADTs #-}</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 MagicHash #-}</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 TypeFamilies #-}</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T16829a</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC7" 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="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;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">T</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;">IntRep</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;">MkT</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="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">T</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/9bbcc3be51180dcefde0c89daf8ad6f69c680b40#6d5a4198d0cf7ff1892d25bf2d2fc639698caede"><strong>testsuite/tests/typecheck/should_fail/T16829a.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T16829a.hs:9:1: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Kind signature on newtype declaration has non-*</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> return kind ‘TYPE 'IntRep’</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> Perhaps you intended to use UnliftedNewtypes</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> • In the newtype declaration for ‘T’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/9bbcc3be51180dcefde0c89daf8ad6f69c680b40#acc0bec10b27de2ec2759b288880bf952660efff"><strong>testsuite/tests/typecheck/should_fail/T16829b.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 GADTs #-}</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 MagicHash #-}</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 TypeFamilies #-}</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T16829b</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC7" 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="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;">data</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">T</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;">IntRep</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">T</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;">IntRep</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MkT</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="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">T</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/9bbcc3be51180dcefde0c89daf8ad6f69c680b40#6207baf175f494141c1d73f60473cf27438e6c23"><strong>testsuite/tests/typecheck/should_fail/T16829b.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T16829b.hs:10:1: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Kind signature on newtype instance declaration has non-*</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> return kind ‘TYPE 'IntRep’</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> Perhaps you intended to use UnliftedNewtypes</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> • In the newtype instance declaration for ‘T’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/9bbcc3be51180dcefde0c89daf8ad6f69c680b40#c368f478faa7aa522de0316b8756b0d906bd8cdf"><strong>testsuite/tests/typecheck/should_fail/UnliftedNewtypesConstraintFamily.stderr</strong></a>
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<pre style="margin: 0;">-<span id="LC1" class="line" lang="plaintext"><span class="idiff left right">UnliftedNewtypesConstraintFamily.hs:11:1:</span></span>
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<pre style="margin: 0;">-<span id="LC2" class="line" lang="plaintext"><span class="idiff left right"> Kind signature on data type declaration has non-*</span></span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> <span class="idiff left right"> and non-variable return kind</span></span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> <span class="idiff left right"> Constraint</span></span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> In the data family declaration for ‘D’</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"><span class="idiff left right">UnliftedNewtypesConstraintFamily.hs:11:1: error:</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> <span class="idiff left right">• Kind signature on data family declaration has non-TYPE</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> <span class="idiff left right">and non-variable return kind ‘Constraint’</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> <span class="idiff left right">•</span> In the data family declaration for ‘D’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/9bbcc3be51180dcefde0c89daf8ad6f69c680b40#b9e86d897a62509b0114d81d5e736630d6f68f43"><strong>testsuite/tests/typecheck/should_fail/all.T</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -524,6 +524,9 @@ test('T15883b', normal, compile_fail, [''])</td>
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524
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<pre style="margin: 0;"> <span id="LC524" class="line" lang="perl"><span class="s" style="color: #d14;">test('</span><span class="nv" style="color: #008080;">T15883c</span><span class="s" style="color: #d14;">', normal, compile_fail, [''])</span></span>
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525
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<pre style="margin: 0;"> <span id="LC525" class="line" lang="perl"><span class="s" style="color: #d14;">test('</span><span class="nv" style="color: #008080;">T15883d</span><span class="s" style="color: #d14;">', normal, compile_fail, [''])</span></span>
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526
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526
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<pre style="margin: 0;"> <span id="LC526" class="line" lang="perl"><span class="s" style="color: #d14;">test('</span><span class="nv" style="color: #008080;">T15883e</span><span class="s" style="color: #d14;">', normal, compile_fail, [''])</span></span>
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<pre style="margin: 0;">+<span id="LC527" class="line" lang="perl"><span class="s" style="color: #d14;">test('</span><span class="nv" style="color: #008080;">T16821</span><span class="s" style="color: #d14;">', normal, compile_fail, [''])</span></span>
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<pre style="margin: 0;">+<span id="LC528" class="line" lang="perl"><span class="s" style="color: #d14;">test('</span><span class="nv" style="color: #008080;">T16829a</span><span class="s" style="color: #d14;">', normal, compile_fail, [''])</span></span>
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<pre style="margin: 0;">+<span id="LC529" class="line" lang="perl"><span class="s" style="color: #d14;">test('</span><span class="nv" style="color: #008080;">T16829b</span><span class="s" style="color: #d14;">', normal, compile_fail, [''])</span></span>
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<pre style="margin: 0;"> <span id="LC530" class="line" lang="perl"><span class="s" style="color: #d14;">test('</span><span class="nv" style="color: #008080;">UnliftedNewtypesFail</span><span class="s" style="color: #d14;">', normal, compile_fail, [''])</span></span>
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<pre style="margin: 0;"> <span id="LC531" class="line" lang="perl"><span class="s" style="color: #d14;">test('</span><span class="nv" style="color: #008080;">UnliftedNewtypesNotEnabled</span><span class="s" style="color: #d14;">', normal, compile_fail, [''])</span></span>
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529
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<pre style="margin: 0;"> <span id="LC532" class="line" lang="perl"><span class="s" style="color: #d14;">test('</span><span class="nv" style="color: #008080;">UnliftedNewtypesCoerceFail</span><span class="s" style="color: #d14;">', normal, compile_fail, [''])</span></span>
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