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<h3>
Marge Bot pushed to branch master
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/716385c90f2f89ac45e256cdb7cdada1981b31ad">716385c9</a></strong>
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<span>by Ryan Scott</span>
<i>at 2020-10-14T12:04:34-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make DataKinds the sole arbiter of kind-level literals (and friends)
Previously, the use of kind-level literals, promoted tuples,
and promoted lists required enabling both `DataKinds` and
`PolyKinds`. This made sense back in a `TypeInType` world, but not so
much now that `TypeInType`'s role has been superseded. Nowadays,
`PolyKinds` only controls kind polymorphism, so let's make `DataKinds`
the thing that controls the other aspects of `TypeInType`, which include
literals, promoted tuples and promoted lists.
There are some other things that overzealously required `PolyKinds`,
which this patch fixes as well:
* Previously, using constraints in kinds (e.g., `data T :: () -> Type`)
required `PolyKinds`, despite the fact that this is orthogonal to kind
polymorphism. This now requires `DataKinds` instead.
* Previously, using kind annotations in kinds
(e.g., `data T :: (Type :: Type) -> Type`) required both `KindSignatures`
and `PolyKinds`. This doesn't make much sense, so it only requires
`KindSignatures` now.
Fixes #18831.
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<h4>6 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#892acbb198a9095c917740d3c1297b56df4e3b7e">
compiler/GHC/Rename/HsType.hs
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</li>
<li class="file-stats">
<a href="#acb4a75038c300e3a7e380e6baf0ae2be208862d">
docs/users_guide/exts/data_kinds.rst
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<li class="file-stats">
<a href="#fa050e1532c92b2ffc94692d8b368f3fefa3196d">
docs/users_guide/exts/poly_kinds.rst
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<li class="file-stats">
<a href="#a7e979e8276d5942426b8a64cea35751446ad7bf">
testsuite/tests/th/T17688b.hs
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<li class="file-stats">
<a href="#5f9e4deeec2ca72a7e1e35ea2fcba2c281fd73b5">
<span class="new-file">
+
testsuite/tests/typecheck/should_compile/T18831.hs
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<li class="file-stats">
<a href="#34fe7bf0e6fbf60effb28393399ba68666593909">
testsuite/tests/typecheck/should_compile/all.T
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<h4>Changes:</h4>
<li id="892acbb198a9095c917740d3c1297b56df4e3b7e">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/716385c90f2f89ac45e256cdb7cdada1981b31ad#892acbb198a9095c917740d3c1297b56df4e3b7e"><strong>compiler/GHC/Rename/HsType.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="441" 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">@@ -441,9 +441,9 @@ sites. This is less precise, but more accurate.</td>
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441
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441
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<pre style="margin: 0;"> <span id="LC441" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">rnHsType is here because we call it from loadInstDecl, and I didn't</span></span>
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442
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<pre style="margin: 0;"> <span id="LC442" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">want a gratuitous knot.</span></span>
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<pre style="margin: 0;"> <span id="LC443" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC444" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [QualTy in kinds]</span></span>
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<pre style="margin: 0;">+<span id="LC444" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [<span class="idiff left right">Hs</span>QualTy in kinds]</span></span>
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<pre style="margin: 0;"> <span id="LC445" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC446" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">I was wondering whether QualTy could occur only at TypeLevel. But no,</span></span>
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<pre style="margin: 0;">+<span id="LC446" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">I was wondering whether <span class="idiff left right">Hs</span>QualTy could occur only at TypeLevel. But no,</span></span>
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447
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<pre style="margin: 0;"> <span id="LC447" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we can have a qualified type in a kind too. Here is an example:</span></span>
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<pre style="margin: 0;"> <span id="LC448" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC449" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type family F a where</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="466" 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="466" 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">@@ -466,9 +466,9 @@ suitable message:</td>
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<pre style="margin: 0;"> <span id="LC466" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Expected kind: G Bool</span></span>
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<pre style="margin: 0;"> <span id="LC467" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Actual kind: F Bool</span></span>
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<pre style="margin: 0;"> <span id="LC468" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC469" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">However: in a kind, the constraints in the QualTy must all be</span></span>
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<pre style="margin: 0;">+<span id="LC469" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">However: in a kind, the constraints in the <span class="idiff left right">Hs</span>QualTy must all be</span></span>
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<pre style="margin: 0;"> <span id="LC470" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">equalities; or at least, any kinds with a class constraint are</span></span>
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<pre style="margin: 0;">-<span id="LC471" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">uninhabited.</span></span>
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<pre style="margin: 0;">+<span id="LC471" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">uninhabited.<span class="idiff left right"> See Note [Constraints in kinds] in GHC.Core.TyCo.Rep.</span></span></span>
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<pre style="margin: 0;"> <span id="LC472" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC473" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC474" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">RnTyKiEnv</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">@@ -574,7 +574,9 @@ rnHsTyKi env ty@(HsForAllTy { hst_tele = tele, hst_body = tau })</td>
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<pre style="margin: 0;"> <span id="LC574" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="p">}</span> <span class="p">}</span></span>
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575
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<pre style="margin: 0;"> <span id="LC575" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC576" class="line" lang="haskell"><span class="n" style="color: #333;">rnHsTyKi</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">ty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsQualTy</span> <span class="p">{</span> <span class="n" style="color: #333;">hst_ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lctxt</span><span class="p">,</span> <span class="n" style="color: #333;">hst_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tau</span> <span class="p">})</span></span>
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577
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<pre style="margin: 0;">-<span id="LC577" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">checkPolyKinds</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">ty</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [QualTy in kinds]</span></span>
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<pre style="margin: 0;">+<span id="LC577" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">data_kinds</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;">DataKinds</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [HsQualTy in kinds]</span></span>
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<pre style="margin: 0;">+<span id="LC578" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">data_kinds</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">isRnKindLevel</span> <span class="n" style="color: #333;">env</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC579" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">addErr</span> <span class="p">(</span><span class="n" style="color: #333;">dataKindsErr</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">ty</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC580" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">ctxt'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnTyKiContext</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">lctxt</span></span>
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581
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<pre style="margin: 0;"> <span id="LC581" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">tau'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnLHsTyKi</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">tau</span></span>
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582
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<pre style="margin: 0;"> <span id="LC582" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsQualTy</span> <span class="p">{</span> <span class="n" style="color: #333;">hst_xqual</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">noExtField</span><span class="p">,</span> <span class="n" style="color: #333;">hst_ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctxt'</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -636,9 +638,8 @@ rnHsTyKi env listTy@(HsListTy _ ty)</td>
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<pre style="margin: 0;"> <span id="LC638" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">ty'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnLHsTyKi</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">ty</span></span>
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639
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<pre style="margin: 0;"> <span id="LC639" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsListTy</span> <span class="n" style="color: #333;">noExtField</span> <span class="n" style="color: #333;">ty'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC640" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC639" class="line" lang="haskell"><span class="n" style="color: #333;">rnHsTyKi</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">t</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsKindSig</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">k</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC640" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">checkPolyKinds</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">t</span></span>
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<pre style="margin: 0;">-<span id="LC641" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">kind_sigs_ok</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;">KindSignatures</span></span>
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<pre style="margin: 0;">+<span id="LC641" class="line" lang="haskell"><span class="n" style="color: #333;">rnHsTyKi</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsKindSig</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">k</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC642" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">kind_sigs_ok</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;">KindSignatures</span></span>
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<pre style="margin: 0;"> <span id="LC643" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">unless</span> <span class="n" style="color: #333;">kind_sigs_ok</span> <span class="p">(</span><span class="n" style="color: #333;">badKindSigErr</span> <span class="p">(</span><span class="n" style="color: #333;">rtke_ctxt</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC644" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">ty'</span><span class="p">,</span> <span class="n" style="color: #333;">lhs_fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnLHsTyKi</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC645" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">k'</span><span class="p">,</span> <span class="n" style="color: #333;">sig_fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnLHsTyKi</span> <span class="p">(</span><span class="n" style="color: #333;">env</span> <span class="p">{</span> <span class="n" style="color: #333;">rtke_level</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">KindLevel</span> <span class="p">})</span> <span class="n" style="color: #333;">k</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">@@ -665,7 +666,6 @@ rnHsTyKi env tyLit@(HsTyLit _ t)</td>
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<pre style="margin: 0;"> <span id="LC666" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">data_kinds</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;">DataKinds</span></span>
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<pre style="margin: 0;"> <span id="LC667" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">unless</span> <span class="n" style="color: #333;">data_kinds</span> <span class="p">(</span><span class="n" style="color: #333;">addErr</span> <span class="p">(</span><span class="n" style="color: #333;">dataKindsErr</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">tyLit</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC668" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">negLit</span> <span class="n" style="color: #333;">t</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">addErr</span> <span class="n" style="color: #333;">negLitErr</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC668" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">checkPolyKinds</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">tyLit</span></span>
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<pre style="margin: 0;"> <span id="LC669" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsTyLit</span> <span class="n" style="color: #333;">noExtField</span> <span class="n" style="color: #333;">t</span><span class="p">,</span> <span class="n" style="color: #333;">emptyFVs</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC670" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC671" class="line" lang="haskell"> <span class="n" style="color: #333;">negLit</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsStrTy</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</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">@@ -705,15 +705,13 @@ rnHsTyKi _ (XHsType (NHsCoreTy ty))</td>
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<pre style="margin: 0;"> <span id="LC705" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- but I don't think it matters</span></span>
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<pre style="margin: 0;"> <span id="LC706" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC707" class="line" lang="haskell"><span class="n" style="color: #333;">rnHsTyKi</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">ty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsExplicitListTy</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ip</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC708" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">checkPolyKinds</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">-<span id="LC709" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">data_kinds</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;">DataKinds</span></span>
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<pre style="margin: 0;">+<span id="LC708" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">data_kinds</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;">DataKinds</span></span>
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<pre style="margin: 0;"> <span id="LC709" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">unless</span> <span class="n" style="color: #333;">data_kinds</span> <span class="p">(</span><span class="n" style="color: #333;">addErr</span> <span class="p">(</span><span class="n" style="color: #333;">dataKindsErr</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">ty</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC710" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">tys'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapFvRn</span> <span class="p">(</span><span class="n" style="color: #333;">rnLHsTyKi</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;"> <span id="LC711" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsExplicitListTy</span> <span class="n" style="color: #333;">noExtField</span> <span class="n" style="color: #333;">ip</span> <span class="n" style="color: #333;">tys'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC712" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC713" class="line" lang="haskell"><span class="n" style="color: #333;">rnHsTyKi</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">ty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsExplicitTupleTy</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC715" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">checkPolyKinds</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">-<span id="LC716" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">data_kinds</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;">DataKinds</span></span>
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<pre style="margin: 0;">+<span id="LC714" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">data_kinds</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;">DataKinds</span></span>
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<pre style="margin: 0;"> <span id="LC715" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">unless</span> <span class="n" style="color: #333;">data_kinds</span> <span class="p">(</span><span class="n" style="color: #333;">addErr</span> <span class="p">(</span><span class="n" style="color: #333;">dataKindsErr</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">ty</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC716" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">tys'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapFvRn</span> <span class="p">(</span><span class="n" style="color: #333;">rnLHsTyKi</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;"> <span id="LC717" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsExplicitTupleTy</span> <span class="n" style="color: #333;">noExtField</span> <span class="n" style="color: #333;">tys'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="p">}</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/716385c90f2f89ac45e256cdb7cdada1981b31ad#acb4a75038c300e3a7e380e6baf0ae2be208862d"><strong>docs/users_guide/exts/data_kinds.rst</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -134,6 +134,12 @@ promotion quote and the data constructor: ::</td>
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<pre style="margin: 0;"> <span id="LC134" class="line" lang="plaintext"> type S = 'A' -- ERROR: looks like a character</span>
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<pre style="margin: 0;"> <span id="LC135" class="line" lang="plaintext"> type R = ' A' -- OK: promoted `A'`</span>
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<pre style="margin: 0;"> <span id="LC136" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC137" class="line" lang="plaintext">Type-level literals</span>
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<pre style="margin: 0;">+<span id="LC138" class="line" lang="plaintext">-------------------</span>
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<pre style="margin: 0;">+<span id="LC139" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC140" class="line" lang="plaintext">:extension:`DataKinds` enables the use of numeric and string literals at the</span>
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<pre style="margin: 0;">+<span id="LC141" class="line" lang="plaintext">type level. For more information, see :ref:`type-level-literals`.</span>
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<pre style="margin: 0;">+<span id="LC142" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC143" class="line" lang="plaintext">.. _promoted-lists-and-tuples:</span>
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<pre style="margin: 0;"> <span id="LC144" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC145" class="line" lang="plaintext">Promoted list and tuple types</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">@@ -207,4 +213,27 @@ above code is valid.</td>
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<pre style="margin: 0;"> <span id="LC213" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC214" class="line" lang="plaintext">See also :ghc-ticket:`7347`.</span>
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<pre style="margin: 0;"> <span id="LC215" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC216" class="line" lang="plaintext">.. _constraints_in_kinds:</span>
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<pre style="margin: 0;">+<span id="LC217" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC218" class="line" lang="plaintext">Constraints in kinds</span>
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<pre style="margin: 0;">+<span id="LC219" class="line" lang="plaintext">--------------------</span>
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<pre style="margin: 0;">+<span id="LC220" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC221" class="line" lang="plaintext">Kinds can (with :extension:`DataKinds`) contain type constraints. However,</span>
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<pre style="margin: 0;">+<span id="LC222" class="line" lang="plaintext">only equality constraints are supported.</span>
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<pre style="margin: 0;">+<span id="LC223" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC224" class="line" lang="plaintext">Here is an example of a constrained kind: ::</span>
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<pre style="margin: 0;">+<span id="LC225" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC226" class="line" lang="plaintext"> type family IsTypeLit a where</span>
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<pre style="margin: 0;">+<span id="LC227" class="line" lang="plaintext"> IsTypeLit Nat = 'True</span>
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<pre style="margin: 0;">+<span id="LC228" class="line" lang="plaintext"> IsTypeLit Symbol = 'True</span>
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<pre style="margin: 0;">+<span id="LC229" class="line" lang="plaintext"> IsTypeLit a = 'False</span>
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<pre style="margin: 0;">+<span id="LC230" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC231" class="line" lang="plaintext"> data T :: forall a. (IsTypeLit a ~ 'True) => a -> Type where</span>
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<pre style="margin: 0;">+<span id="LC232" class="line" lang="plaintext"> MkNat :: T 42</span>
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<pre style="margin: 0;">+<span id="LC233" class="line" lang="plaintext"> MkSymbol :: T "Don't panic!"</span>
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<pre style="margin: 0;"> <span id="LC234" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC235" class="line" lang="plaintext">The declarations above are accepted. However, if we add ``MkOther :: T Int``,</span>
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<pre style="margin: 0;">+<span id="LC236" class="line" lang="plaintext">we get an error that the equality constraint is not satisfied; ``Int`` is</span>
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<pre style="margin: 0;">+<span id="LC237" class="line" lang="plaintext">not a type literal. Note that explicitly quantifying with ``forall a`` is</span>
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<pre style="margin: 0;">+<span id="LC238" class="line" lang="plaintext">necessary in order for ``T`` to typecheck</span>
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<pre style="margin: 0;">+<span id="LC239" class="line" lang="plaintext">(see :ref:`complete-kind-signatures`).</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/716385c90f2f89ac45e256cdb7cdada1981b31ad#fa050e1532c92b2ffc94692d8b368f3fefa3196d"><strong>docs/users_guide/exts/poly_kinds.rst</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -787,29 +787,6 @@ distinction). GHC does not consider ``forall k. k -> Type`` and</td>
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<pre style="margin: 0;"> <span id="LC787" class="line" lang="plaintext">``forall {k}. k -> Type`` to be equal at the kind level, and thus rejects</span>
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<pre style="margin: 0;"> <span id="LC788" class="line" lang="plaintext">``Foo Proxy`` as ill-kinded.</span>
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<pre style="margin: 0;"> <span id="LC789" class="line" lang="plaintext"></span>
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790
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<pre style="margin: 0;">-<span id="LC790" class="line" lang="plaintext">Constraints in kinds</span>
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<pre style="margin: 0;">-<span id="LC791" class="line" lang="plaintext">--------------------</span>
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<pre style="margin: 0;">-<span id="LC792" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC793" class="line" lang="plaintext">As kinds and types are the same, kinds can (with :extension:`TypeInType`)</span>
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794
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<pre style="margin: 0;">-<span id="LC794" class="line" lang="plaintext">contain type constraints. However, only equality constraints are supported.</span>
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<pre style="margin: 0;">-<span id="LC795" class="line" lang="plaintext"></span>
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796
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<pre style="margin: 0;">-<span id="LC796" class="line" lang="plaintext">Here is an example of a constrained kind: ::</span>
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<pre style="margin: 0;">-<span id="LC797" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC798" class="line" lang="plaintext"> type family IsTypeLit a where</span>
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<pre style="margin: 0;">-<span id="LC799" class="line" lang="plaintext"> IsTypeLit Nat = 'True</span>
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<pre style="margin: 0;">-<span id="LC800" class="line" lang="plaintext"> IsTypeLit Symbol = 'True</span>
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<pre style="margin: 0;">-<span id="LC801" class="line" lang="plaintext"> IsTypeLit a = 'False</span>
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<pre style="margin: 0;">-<span id="LC802" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC803" class="line" lang="plaintext"> data T :: forall a. (IsTypeLit a ~ 'True) => a -> Type where</span>
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<pre style="margin: 0;">-<span id="LC804" class="line" lang="plaintext"> MkNat :: T 42</span>
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<pre style="margin: 0;">-<span id="LC805" class="line" lang="plaintext"> MkSymbol :: T "Don't panic!"</span>
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<pre style="margin: 0;">-<span id="LC806" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC807" class="line" lang="plaintext">The declarations above are accepted. However, if we add ``MkOther :: T Int``,</span>
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<pre style="margin: 0;">-<span id="LC808" class="line" lang="plaintext">we get an error that the equality constraint is not satisfied; ``Int`` is</span>
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<pre style="margin: 0;">-<span id="LC809" class="line" lang="plaintext">not a type literal. Note that explicitly quantifying with ``forall a`` is</span>
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<pre style="margin: 0;">-<span id="LC810" class="line" lang="plaintext">necessary in order for ``T`` to typecheck</span>
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<pre style="margin: 0;">-<span id="LC811" class="line" lang="plaintext">(see :ref:`complete-kind-signatures`).</span>
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<pre style="margin: 0;">-<span id="LC812" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC790" class="line" lang="plaintext">The kind ``Type``</span>
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<pre style="margin: 0;"> <span id="LC791" class="line" lang="plaintext">-----------------</span>
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<pre style="margin: 0;"> <span id="LC792" class="line" lang="plaintext"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/716385c90f2f89ac45e256cdb7cdada1981b31ad#a7e979e8276d5942426b8a64cea35751446ad7bf"><strong>testsuite/tests/th/T17688b.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 PolyKinds #-}</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 RankNTypes #-}</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 StandaloneKindSignatures #-}</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/716385c90f2f89ac45e256cdb7cdada1981b31ad#5f9e4deeec2ca72a7e1e35ea2fcba2c281fd73b5"><strong>testsuite/tests/typecheck/should_compile/T18831.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 KindSignatures #-}</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;">T18831</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;">Data.Proxy</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">T1</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Proxy</span> <span class="mi" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span></span>
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9
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">T2</span> <span class="o" style="font-weight: 600;">::</span> <span class="nb" style="color: #0086b3;">()</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">T3</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="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>
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11
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">T4</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Proxy</span> <span class="sc" style="color: #d14;">'[</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">T</span><span class="n" style="color: #333;">ype</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="kt" style="color: #458; font-weight: 600;">Type</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">T5</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Proxy</span> <span class="sc" style="color: #d14;">'(</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">T</span><span class="n" style="color: #333;">ype</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="kt" style="color: #458; font-weight: 600;">Type</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/716385c90f2f89ac45e256cdb7cdada1981b31ad#34fe7bf0e6fbf60effb28393399ba68666593909"><strong>testsuite/tests/typecheck/should_compile/all.T</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="722" 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="722" 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">@@ -722,5 +722,6 @@ test('T18412', normal, compile, [''])</td>
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722
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<pre style="margin: 0;"> <span id="LC722" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18470</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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723
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<pre style="margin: 0;"> <span id="LC723" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18323</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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724
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<pre style="margin: 0;"> <span id="LC724" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18585</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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725
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<pre style="margin: 0;">+<span id="LC725" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18831</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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725
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<pre style="margin: 0;"> <span id="LC726" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T15942</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC727" class="line" lang="perl"></span></pre>
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