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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:
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<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4bf18646acbb5a59ad8716aedc32acfe2ead0f58">4bf18646</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-03T08:37:42+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve handling of data type return kinds
Following a long conversation with Richard, this patch tidies up the
handling of return kinds for data/newtype declarations (vanilla,
family, and instance).
I have substantially edited the Notes in TyCl, so they would
bear careful reading.
Fixes #18300, #18357
In GHC.Tc.Instance.Family.newFamInst we were checking some Lint-like
properties with ASSSERT. Instead Richard and I have added
a proper linter for axioms, and called it from lintGblEnv, which in
turn is called in tcRnModuleTcRnM
New tests (T18300, T18357) cause an ASSERT failure in HEAD.
</pre>
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<h4>28 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#f10ed7a2470454dfdd8691a08beba67d8b78ee70">
compiler/GHC/Core/Coercion/Axiom.hs
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<li class="file-stats">
<a href="#6fcf64907fb5bdd93082d2d1eb94e4566e735865">
compiler/GHC/Core/DataCon.hs
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<li class="file-stats">
<a href="#91648438362e5a35363d2bb7abb04016dedd7d7e">
compiler/GHC/Core/FamInstEnv.hs
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<li class="file-stats">
<a href="#36a42448a83a9d1f6df8475f03ead2eed199dd8e">
compiler/GHC/Core/Lint.hs
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<li class="file-stats">
<a href="#4aad0050db1a8a20db8bbca149111de99cb299c9">
compiler/GHC/Core/TyCon.hs
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<li class="file-stats">
<a href="#84c9d3ba34173297e7d7747e02caa2e004b164fc">
compiler/GHC/Core/Type.hs
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<a href="#9355bef855426caf5f526925edf351b20f9a86c4">
compiler/GHC/Tc/Gen/HsType.hs
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<li class="file-stats">
<a href="#07389a8f0516c26409d86f6bb651ed00759b5d4c">
compiler/GHC/Tc/Instance/Family.hs
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<a href="#e65390fa5a32c453a81a1c9a3e1c4464d155ca4a">
compiler/GHC/Tc/Module.hs
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<li class="file-stats">
<a href="#83d23a46bb6cdc8b1edc16f1fd2c8f5c53e2c9ca">
compiler/GHC/Tc/TyCl.hs
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<a href="#e63425e031ffe9350ee6b1687e506aaea75d11e1">
compiler/GHC/Tc/TyCl/Instance.hs
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<li class="file-stats">
<a href="#7dcf5b567a6cd3c9d98cf8d57323fbca1b1536e9">
compiler/GHC/Tc/Types.hs
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<a href="#59d42d45d27a766c3ef299d73c226697153b7f6e">
compiler/GHC/Tc/Utils/Instantiate.hs
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<a href="#f740374ad9d1ce333c9d2992b2feda632e24371f">
docs/core-spec/CoreLint.ott
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<li class="file-stats">
<a href="#560a2a2363bd7c0d01f90fdb07e153565ada8556">
docs/core-spec/CoreSyn.ott
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<li class="file-stats">
<a href="#7dc5395d86b92c5a2b05aa2e9c13c1635f051da8">
docs/core-spec/core-spec.mng
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<a href="#992e7eb1bd13e4d31f52ca068190ea73dba7e829">
docs/core-spec/core-spec.pdf
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<li class="file-stats">
<a href="#06c32582e3db8cd4d22527045923c480aab8dfbb">
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testsuite/tests/polykinds/T18300.hs
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<a href="#1b7bd6a45b74d0d2c4315fb30e7b443cb75d769c">
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testsuite/tests/polykinds/T18300.stderr
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<li class="file-stats">
<a href="#37bb83d0a916288b2296ba25cdbbef228eed6484">
testsuite/tests/polykinds/all.T
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<a href="#34fe7bf0e6fbf60effb28393399ba68666593909">
testsuite/tests/typecheck/should_compile/all.T
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<a href="#abeee31addce4ae0b09edade85a4762fcf3e68e8">
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testsuite/tests/typecheck/should_fail/T18357.hs
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testsuite/tests/typecheck/should_fail/T18357.stderr
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testsuite/tests/typecheck/should_fail/T18357a.hs
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testsuite/tests/typecheck/should_fail/T18357a.stderr
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<a href="#156cc2660393f1d1fc85c7add1ed2dbebe4ed154">
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testsuite/tests/typecheck/should_fail/T18357b.hs
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<a href="#fb000425d2ea4fbc52dd7bccf11fd592c30722e2">
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testsuite/tests/typecheck/should_fail/T18357b.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="f10ed7a2470454dfdd8691a08beba67d8b78ee70">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4bf18646acbb5a59ad8716aedc32acfe2ead0f58#f10ed7a2470454dfdd8691a08beba67d8b78ee70"><strong>compiler/GHC/Core/Coercion/Axiom.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="184" 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">@@ -184,9 +184,10 @@ Note [Storing compatibility]</td>
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<pre style="margin: 0;"> <span id="LC184" 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="LC185" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">During axiom application, we need to be aware of which branches are compatible</span></span>
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<td class="diff-line-num new_line" data-linenumber="186" 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="LC186" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with which others. The full explanation is in Note [Compatibility] in</span></span>
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<td class="diff-line-num old old_line" data-linenumber="187" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC187" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">FamInstEnv. (The code is placed there to avoid a dependency from CoAxiom on</span></span>
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<td class="diff-line-num old old_line" data-linenumber="188" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<td class="diff-line-num new_line old" data-linenumber="187" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC188" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the unification algorithm.) Although we could theoretically compute</span></span>
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<td class="diff-line-num old old_line" data-linenumber="189" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<td class="diff-line-num new_line old" data-linenumber="187" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC189" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">compatibility on the fly, this is silly, so we store it in a CoAxiom.</span></span>
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<td class="diff-line-num new old_line" data-linenumber="190" 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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<td class="diff-line-num new new_line" data-linenumber="187" 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="LC187" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHc.Core.FamInstEnv. (The code is placed there to avoid a dependency from</span></span>
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<td class="diff-line-num new old_line" data-linenumber="190" 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="LC188" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC.Core.Coercion.Axiom on the unification algorithm.) Although we could</span></span>
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<td class="diff-line-num new new_line" data-linenumber="189" 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="LC189" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">theoretically compute compatibility on the fly, this is silly, so we store it</span></span>
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<td class="diff-line-num new new_line" data-linenumber="190" 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="LC190" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in a CoAxiom.</span></span>
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<pre style="margin: 0;"> <span id="LC191" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC192" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Specifically, each branch refers to all other branches with which it is</span></span>
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<pre style="margin: 0;"> <span id="LC193" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">incompatible. This list might well be empty, and it will always be for the</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="233" 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="234" 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">@@ -233,8 +234,8 @@ data CoAxBranch</td>
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<pre style="margin: 0;"> <span id="LC234" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">cab_loc</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SrcSpan</span> <span class="c1" style="color: #998; font-style: italic;">-- Location of the defining equation</span></span>
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<pre style="margin: 0;"> <span id="LC235" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [CoAxiom locations]</span></span>
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235
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236
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<pre style="margin: 0;"> <span id="LC236" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cab_tvs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- Bound type variables; not necessarily fresh</span></span>
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236
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<pre style="margin: 0;">-<span id="LC236" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cab_eta_tvs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- Eta-reduced tyvars</span></span>
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237
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237
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<pre style="margin: 0;"> <span id="LC237" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [CoAxBranch type variables]</span></span>
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238
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<pre style="margin: 0;">+<span id="LC238" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cab_eta_tvs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- Eta-reduced tyvars</span></span>
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238
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<pre style="margin: 0;"> <span id="LC239" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- cab_tvs and cab_lhs may be eta-reduced; see</span></span>
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239
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240
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<pre style="margin: 0;"> <span id="LC240" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Eta reduction for data families]</span></span>
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241
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<pre style="margin: 0;"> <span id="LC241" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cab_cvs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoVar</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- Bound coercion variables</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4bf18646acbb5a59ad8716aedc32acfe2ead0f58#6fcf64907fb5bdd93082d2d1eb94e4566e735865"><strong>compiler/GHC/Core/DataCon.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">@@ -425,7 +425,7 @@ data DataCon</td>
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<pre style="margin: 0;"> <span id="LC425" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: for a data instance, the original user result type may</span></span>
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<pre style="margin: 0;"> <span id="LC426" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- differ from the DataCon's representation TyCon. Example</span></span>
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427
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<pre style="margin: 0;"> <span id="LC427" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- data instance T [a] where MkT :: a -> T [a]</span></span>
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<pre style="margin: 0;">-<span id="LC428" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The <span class="idiff left right">OrigResTy is T [a], but the dcRepTyCon might be :T123</span></span></span>
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<pre style="margin: 0;">+<span id="LC428" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The <span class="idiff left right">dcOrigResTy is T [a], but the dcRepTyCon might be R:TList</span></span></span>
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<pre style="margin: 0;"> <span id="LC429" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC430" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Now the strictness annotations and field labels of the constructor</span></span>
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<pre style="margin: 0;"> <span id="LC431" class="line" lang="haskell"> <span class="n" style="color: #333;">dcSrcBangs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">HsSrcBang</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">@@ -1576,4 +1576,3 @@ splitDataProductType_maybe ty</td>
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1576
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<pre style="margin: 0;"> <span id="LC1576" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">tycon</span><span class="p">,</span> <span class="n" style="color: #333;">ty_args</span><span class="p">,</span> <span class="n" style="color: #333;">con</span><span class="p">,</span> <span class="n" style="color: #333;">dataConInstArgTys</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">ty_args</span><span class="p">)</span></span>
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1577
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1577
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<pre style="margin: 0;"> <span id="LC1577" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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1578
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<pre style="margin: 0;"> <span id="LC1578" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span></pre>
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<pre style="margin: 0;">-<span id="LC1579" class="line" lang="haskell"></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4bf18646acbb5a59ad8716aedc32acfe2ead0f58#91648438362e5a35363d2bb7abb04016dedd7d7e"><strong>compiler/GHC/Core/FamInstEnv.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">@@ -640,16 +640,13 @@ that Note.</td>
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<pre style="margin: 0;"> <span id="LC640" class="line" lang="haskell"><span class="n" style="color: #333;">mkCoAxBranch</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- original, possibly stale, tyvars</span></span>
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<pre style="margin: 0;"> <span id="LC641" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- Extra eta tyvars</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="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoVar</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- possibly stale covars</span></span>
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<pre style="margin: 0;">-<span id="LC643" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="c1" style="color: #998; font-style: italic;">-- family/newtype TyCon (for error-checking only)</span></span>
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<pre style="margin: 0;"> <span id="LC643" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- LHS patterns</span></span>
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<pre style="margin: 0;"> <span id="LC644" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="c1" style="color: #998; font-style: italic;">-- RHS</span></span>
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<pre style="margin: 0;"> <span id="LC645" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Role</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC646" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SrcSpan</span></span>
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<pre style="margin: 0;"> <span id="LC647" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoAxBranch</span></span>
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<pre style="margin: 0;">-<span id="LC649" class="line" lang="haskell"><span class="n" style="color: #333;">mkCoAxBranch</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">eta_tvs</span> <span class="n" style="color: #333;">cvs</span> <span class="n" style="color: #333;">ax_tc</span> <span class="n" style="color: #333;">lhs</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">roles</span> <span class="n" style="color: #333;">loc</span></span>
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<pre style="margin: 0;">-<span id="LC650" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [CoAxioms are homogeneous] in "GHC.Core.Coercion.Axiom"</span></span>
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<pre style="margin: 0;">-<span id="LC651" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">typeKind</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">ax_tc</span> <span class="n" style="color: #333;">lhs</span><span class="p">)</span> <span class="p">`</span><span class="n" style="color: #333;">eqType</span><span class="p">`</span> <span class="n" style="color: #333;">typeKind</span> <span class="n" style="color: #333;">rhs</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC652" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CoAxBranch</span> <span class="p">{</span> <span class="n" style="color: #333;">cab_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tvs'</span></span>
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<pre style="margin: 0;">+<span id="LC648" class="line" lang="haskell"><span class="n" style="color: #333;">mkCoAxBranch</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">eta_tvs</span> <span class="n" style="color: #333;">cvs</span> <span class="n" style="color: #333;">lhs</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">roles</span> <span class="n" style="color: #333;">loc</span></span>
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<pre style="margin: 0;">+<span id="LC649" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CoAxBranch</span> <span class="p">{</span> <span class="n" style="color: #333;">cab_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tvs'</span></span>
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<pre style="margin: 0;"> <span id="LC650" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cab_eta_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eta_tvs'</span></span>
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<pre style="margin: 0;"> <span id="LC651" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cab_cvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cvs'</span></span>
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<pre style="margin: 0;"> <span id="LC652" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cab_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tidyTypes</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">lhs</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">@@ -703,7 +700,7 @@ mkSingleCoAxiom role ax_name tvs eta_tvs cvs fam_tc lhs_tys rhs_ty</td>
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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;">co_ax_implicit</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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<pre style="margin: 0;"> <span id="LC701" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">co_ax_branches</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unbranched</span> <span class="p">(</span><span class="n" style="color: #333;">branch</span> <span class="p">{</span> <span class="n" style="color: #333;">cab_incomps</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="p">})</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC702" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC706" class="line" lang="haskell"> <span class="n" style="color: #333;">branch</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkCoAxBranch</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">eta_tvs</span> <span class="n" style="color: #333;">cvs</span> <span class="n" style="color: #333;"><span class="idiff left">fam_tc</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">lhs_tys</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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<pre style="margin: 0;">+<span id="LC703" class="line" lang="haskell"> <span class="n" style="color: #333;">branch</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkCoAxBranch</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">eta_tvs</span> <span class="n" style="color: #333;">cvs</span> <span class="n" style="color: #333;">lhs_tys</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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<pre style="margin: 0;"> <span id="LC704" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">const</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span><span class="p">)</span> <span class="n" style="color: #333;">tvs</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC705" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">getSrcSpan</span> <span class="n" style="color: #333;">ax_name</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC706" 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">@@ -721,7 +718,7 @@ mkNewTypeCoAxiom name tycon tvs roles rhs_ty</td>
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<pre style="margin: 0;"> <span id="LC718" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">co_ax_tc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tycon</span></span>
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<pre style="margin: 0;"> <span id="LC719" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">co_ax_branches</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unbranched</span> <span class="p">(</span><span class="n" style="color: #333;">branch</span> <span class="p">{</span> <span class="n" style="color: #333;">cab_incomps</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="p">})</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC720" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC724" class="line" lang="haskell"> <span class="n" style="color: #333;">branch</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkCoAxBranch</span> <span class="n" style="color: #333;">tvs</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;"><span class="idiff left">tycon</span></span><span class="idiff right"> </span><span class="p">(</span><span class="n" style="color: #333;">mkTyVarTys</span> <span class="n" style="color: #333;">tvs</span><span class="p">)</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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<pre style="margin: 0;">+<span id="LC721" class="line" lang="haskell"> <span class="n" style="color: #333;">branch</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkCoAxBranch</span> <span class="n" style="color: #333;">tvs</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyVarTys</span> <span class="n" style="color: #333;">tvs</span><span class="p">)</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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<pre style="margin: 0;"> <span id="LC722" class="line" lang="haskell"> <span class="n" style="color: #333;">roles</span> <span class="p">(</span><span class="n" style="color: #333;">getSrcSpan</span> <span class="n" style="color: #333;">name</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC723" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC724" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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<li id="36a42448a83a9d1f6df8475f03ead2eed199dd8e">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4bf18646acbb5a59ad8716aedc32acfe2ead0f58#36a42448a83a9d1f6df8475f03ead2eed199dd8e"><strong>compiler/GHC/Core/Lint.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">@@ -8,13 +8,12 @@ See Note [Core Lint guarantee].</td>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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9
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE CPP #-}</span></span>
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<pre style="margin: 0;">-<span id="LC11" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE ViewPatterns #-}</span></span>
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<pre style="margin: 0;">-<span id="LC12" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE ScopedTypeVariables, DeriveFunctor #-}</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE ViewPatterns, ScopedTypeVariables, DeriveFunctor, MultiWayIf #-}</span></span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.Core.Lint</span> <span class="p">(</span></span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">lintCoreBindings</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lintUnfolding</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">lintPassResult</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lintInteractiveExpr</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lintExpr</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC17" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">lintAnnots</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lint<span class="idiff left right">Type</span>s</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">lintAnnots</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lint<span class="idiff left right">Axiom</span>s</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ** Debug output</span></span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">endPass</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">endPassIO</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">@@ -36,7 +35,7 @@ import GHC.Types.Literal</td>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.DataCon</span></span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Builtin.Types.Prim</span></span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Builtin.Types</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">multiplicityTy</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC39" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.TcType</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">isFloatingTy</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.TcType</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">isFloatingTy</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">isTyFamFree</span></span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">Var</span></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var.Env</span></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var.Set</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">@@ -56,9 +55,10 @@ import GHC.Types.RepType</td>
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCo.Rep</span> <span class="c1" style="color: #998; font-style: italic;">-- checks validity of types/coercions</span></span>
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCo.Subst</span></span>
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<pre style="margin: 0;"> <span id="LC57" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCo.FVs</span></span>
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<pre style="margin: 0;">-<span id="LC59" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCo.Ppr</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">pprTyVar</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC58" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCo.Ppr</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">pprTyVar</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">pprTyVars</span></span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC59" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCon</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">TyCon</span></span>
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Coercion.Axiom</span></span>
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<pre style="margin: 0;">+<span id="LC61" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Unify</span></span>
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<pre style="margin: 0;"> <span id="LC62" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Basic</span></span>
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<pre style="margin: 0;"> <span id="LC63" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Error</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">Err</span></span>
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<pre style="margin: 0;"> <span id="LC64" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.List.SetOps</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">@@ -76,7 +76,7 @@ import GHC.Driver.Session</td>
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<pre style="margin: 0;"> <span id="LC76" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Monad</span></span>
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<pre style="margin: 0;"> <span id="LC77" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Monad</span></span>
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<pre style="margin: 0;"> <span id="LC78" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Foldable</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">toList</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC79" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List.NonEmpty</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC79" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List.NonEmpty</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span><span class="p"><span class="idiff left">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">..</span></span><span class="p"><span class="idiff">),</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">groupWith</span></span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC80" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">partition</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC81" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Maybe</span></span>
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<pre style="margin: 0;"> <span id="LC82" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.Pair</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">@@ -1587,18 +1587,6 @@ lintIdBndr top_lvl bind_site id thing_inside</td>
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1587
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1587
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<pre style="margin: 0;"> <span id="LC1587" 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="LC1588" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1589
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<pre style="margin: 0;"> <span id="LC1589" class="line" lang="haskell"></span>
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1590
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<pre style="margin: 0;">-<span id="LC1590" class="line" lang="haskell"><span class="n" style="color: #333;">lintTypes</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span></span>
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1591
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<pre style="margin: 0;">-<span id="LC1591" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyCoVar</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- Treat these as in scope</span></span>
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<pre style="margin: 0;">-<span id="LC1592" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span></span>
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1593
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<pre style="margin: 0;">-<span id="LC1593" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">MsgDoc</span> <span class="c1" style="color: #998; font-style: italic;">-- Nothing => OK</span></span>
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1594
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<pre style="margin: 0;">-<span id="LC1594" class="line" lang="haskell"><span class="n" style="color: #333;">lintTypes</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">vars</span> <span class="n" style="color: #333;">tys</span></span>
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1595
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<pre style="margin: 0;">-<span id="LC1595" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isEmptyBag</span> <span class="n" style="color: #333;">errs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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1596
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<pre style="margin: 0;">-<span id="LC1596" 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;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">pprMessageBag</span> <span class="n" style="color: #333;">errs</span><span class="p">)</span></span>
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1597
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<pre style="margin: 0;">-<span id="LC1597" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1598
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<pre style="margin: 0;">-<span id="LC1598" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">_warns</span><span class="p">,</span> <span class="n" style="color: #333;">errs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">initL</span> <span class="n" style="color: #333;">dflags</span> <span class="p">(</span><span class="n" style="color: #333;">defaultLintFlags</span> <span class="n" style="color: #333;">dflags</span><span class="p">)</span> <span class="n" style="color: #333;">vars</span> <span class="n" style="color: #333;">linter</span></span>
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1599
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<pre style="margin: 0;">-<span id="LC1599" class="line" lang="haskell"> <span class="n" style="color: #333;">linter</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lintBinders</span> <span class="kt" style="color: #458; font-weight: 600;">LambdaBind</span> <span class="n" style="color: #333;">vars</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span></span>
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1600
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<pre style="margin: 0;">-<span id="LC1600" class="line" lang="haskell"> <span class="n" style="color: #333;">mapM_</span> <span class="n" style="color: #333;">lintType</span> <span class="n" style="color: #333;">tys</span></span>
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1601
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<pre style="margin: 0;">-<span id="LC1601" class="line" lang="haskell"></span>
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1602
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<pre style="margin: 0;"> <span id="LC1590" class="line" lang="haskell"><span class="n" style="color: #333;">lintValueType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LintM</span> <span class="kt" style="color: #458; font-weight: 600;">LintedType</span></span>
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<pre style="margin: 0;"> <span id="LC1591" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Types only, not kinds</span></span>
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<pre style="margin: 0;"> <span id="LC1592" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Check the type, and apply the substitution to it</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1617" 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="1605" 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">@@ -1617,7 +1605,7 @@ checkTyCon tc</td>
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1617
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1605
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<pre style="margin: 0;"> <span id="LC1605" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">checkL</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isTcTyCon</span> <span class="n" style="color: #333;">tc</span><span class="p">))</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Found TcTyCon:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tc</span><span class="p">)</span></span>
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1618
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1606
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<pre style="margin: 0;"> <span id="LC1606" class="line" lang="haskell"></span>
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1619
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1607
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<pre style="margin: 0;"> <span id="LC1607" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-------------------</span></span>
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1620
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<pre style="margin: 0;">-<span id="LC1620" class="line" lang="haskell"><span class="n" style="color: #333;">lintType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Linted</span>Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LintM</span> <span class="kt" style="color: #458; font-weight: 600;">LintedType</span></span>
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1608
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<pre style="margin: 0;">+<span id="LC1608" class="line" lang="haskell"><span class="n" style="color: #333;">lintType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LintM</span> <span class="kt" style="color: #458; font-weight: 600;">LintedType</span></span>
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1621
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1609
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<pre style="margin: 0;"> <span id="LC1609" class="line" lang="haskell"></span>
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1622
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1610
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<pre style="margin: 0;"> <span id="LC1610" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If you edit this function, you may need to update the GHC formalism</span></span>
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<pre style="margin: 0;"> <span id="LC1611" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [GHC Formalism]</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">@@ -2342,6 +2330,175 @@ lintCoercion (HoleCo h)</td>
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<pre style="margin: 0;"> <span id="LC2330" 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;">addErrL</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Unfilled coercion hole:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">h</span></span>
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<pre style="margin: 0;"> <span id="LC2331" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">lintCoercion</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoVarCo</span> <span class="p">(</span><span class="n" style="color: #333;">coHoleCoVar</span> <span class="n" style="color: #333;">h</span><span class="p">))</span> <span class="p">}</span></span>
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2332
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<pre style="margin: 0;"> <span id="LC2332" class="line" lang="haskell"></span>
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2333
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<pre style="margin: 0;">+<span id="LC2333" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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2334
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<pre style="margin: 0;">+<span id="LC2334" 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="LC2335" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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2336
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<pre style="margin: 0;">+<span id="LC2336" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Axioms</span></span>
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<pre style="margin: 0;">+<span id="LC2337" 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="LC2338" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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2339
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<pre style="margin: 0;">+<span id="LC2339" 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="LC2340" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2341" class="line" lang="haskell"><span class="n" style="color: #333;">lintAxioms</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span></span>
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<pre style="margin: 0;">+<span id="LC2342" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoAxiom</span> <span class="kt" style="color: #458; font-weight: 600;">Branched</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC2343" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">WarnsAndErrs</span></span>
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<pre style="margin: 0;">+<span id="LC2344" class="line" lang="haskell"><span class="n" style="color: #333;">lintAxioms</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">axioms</span></span>
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<pre style="margin: 0;">+<span id="LC2345" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">initL</span> <span class="n" style="color: #333;">dflags</span> <span class="p">(</span><span class="n" style="color: #333;">defaultLintFlags</span> <span class="n" style="color: #333;">dflags</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC2346" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">mapM_</span> <span class="n" style="color: #333;">lint_axiom</span> <span class="n" style="color: #333;">axioms</span></span>
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<pre style="margin: 0;">+<span id="LC2347" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">axiom_groups</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">groupWith</span> <span class="n" style="color: #333;">coAxiomTyCon</span> <span class="n" style="color: #333;">axioms</span></span>
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<pre style="margin: 0;">+<span id="LC2348" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mapM_</span> <span class="n" style="color: #333;">lint_axiom_group</span> <span class="n" style="color: #333;">axiom_groups</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC2349" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2350" class="line" lang="haskell"><span class="n" style="color: #333;">lint_axiom</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CoAxiom</span> <span class="kt" style="color: #458; font-weight: 600;">Branched</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LintM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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2351
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<pre style="margin: 0;">+<span id="LC2351" class="line" lang="haskell"><span class="n" style="color: #333;">lint_axiom</span> <span class="n" style="color: #333;">ax</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoAxiom</span> <span class="p">{</span> <span class="n" style="color: #333;">co_ax_tc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tc</span><span class="p">,</span> <span class="n" style="color: #333;">co_ax_branches</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">branches</span></span>
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2352
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<pre style="margin: 0;">+<span id="LC2352" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">co_ax_role</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ax_role</span> <span class="p">})</span></span>
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2353
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<pre style="margin: 0;">+<span id="LC2353" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addLoc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">InAxiom</span> <span class="n" style="color: #333;">ax</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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2354
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<pre style="margin: 0;">+<span id="LC2354" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">mapM_</span> <span class="p">(</span><span class="n" style="color: #333;">lint_branch</span> <span class="n" style="color: #333;">tc</span><span class="p">)</span> <span class="n" style="color: #333;">branch_list</span></span>
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2355
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<pre style="margin: 0;">+<span id="LC2355" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">extra_checks</span> <span class="p">}</span></span>
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2356
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<pre style="margin: 0;">+<span id="LC2356" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2357
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<pre style="margin: 0;">+<span id="LC2357" class="line" lang="haskell"> <span class="n" style="color: #333;">branch_list</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fromBranches</span> <span class="n" style="color: #333;">branches</span></span>
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2358
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<pre style="margin: 0;">+<span id="LC2358" class="line" lang="haskell"></span>
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2359
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<pre style="margin: 0;">+<span id="LC2359" class="line" lang="haskell"> <span class="n" style="color: #333;">extra_checks</span></span>
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2360
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<pre style="margin: 0;">+<span id="LC2360" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isNewTyCon</span> <span class="n" style="color: #333;">tc</span></span>
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2361
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<pre style="margin: 0;">+<span id="LC2361" 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="kt" style="color: #458; font-weight: 600;">CoAxBranch</span> <span class="p">{</span> <span class="n" style="color: #333;">cab_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tvs</span></span>
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2362
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<pre style="margin: 0;">+<span id="LC2362" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cab_eta_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eta_tvs</span></span>
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2363
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<pre style="margin: 0;">+<span id="LC2363" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cab_cvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cvs</span></span>
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2364
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<pre style="margin: 0;">+<span id="LC2364" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cab_roles</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">roles</span></span>
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2365
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<pre style="margin: 0;">+<span id="LC2365" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cab_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lhs_tys</span> <span class="p">}</span></span>
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2366
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<pre style="margin: 0;">+<span id="LC2366" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">branch_list</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2367
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<pre style="margin: 0;">+<span id="LC2367" class="line" lang="haskell"> <span class="p">[</span><span class="n" style="color: #333;">branch</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">branch</span></span>
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2368
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<pre style="margin: 0;">+<span id="LC2368" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">failWithL</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"multi-branch axiom with newtype"</span><span class="p">)</span></span>
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2369
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<pre style="margin: 0;">+<span id="LC2369" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ax_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkInfForAllTys</span> <span class="n" style="color: #333;">tvs</span> <span class="o" style="font-weight: 600;">$</span></span>
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2370
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<pre style="margin: 0;">+<span id="LC2370" class="line" lang="haskell"> <span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">lhs_tys</span></span>
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<pre style="margin: 0;">+<span id="LC2371" class="line" lang="haskell"> <span class="n" style="color: #333;">nt_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">takeList</span> <span class="n" style="color: #333;">tvs</span> <span class="p">(</span><span class="n" style="color: #333;">tyConTyVars</span> <span class="n" style="color: #333;">tc</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2372" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- axiom may be eta-reduced: Note [Newtype eta] in GHC.Core.TyCon</span></span>
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2373
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<pre style="margin: 0;">+<span id="LC2373" class="line" lang="haskell"> <span class="n" style="color: #333;">nt_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkInfForAllTys</span> <span class="n" style="color: #333;">nt_tvs</span> <span class="o" style="font-weight: 600;">$</span></span>
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2374
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<pre style="margin: 0;">+<span id="LC2374" class="line" lang="haskell"> <span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">tc</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyVarTys</span> <span class="n" style="color: #333;">nt_tvs</span><span class="p">)</span></span>
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2375
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<pre style="margin: 0;">+<span id="LC2375" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Newtype eta] in GHC.Core.TyCon</span></span>
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2376
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<pre style="margin: 0;">+<span id="LC2376" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">lintL</span> <span class="p">(</span><span class="n" style="color: #333;">ax_lhs</span> <span class="p">`</span><span class="n" style="color: #333;">eqType</span><span class="p">`</span> <span class="n" style="color: #333;">nt_lhs</span><span class="p">)</span></span>
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2377
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<pre style="margin: 0;">+<span id="LC2377" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Newtype axiom LHS does not match newtype definition"</span><span class="p">)</span></span>
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2378
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<pre style="margin: 0;">+<span id="LC2378" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">lintL</span> <span class="p">(</span><span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">cvs</span><span class="p">)</span></span>
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2379
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<pre style="margin: 0;">+<span id="LC2379" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Newtype axiom binds coercion variables"</span><span class="p">)</span></span>
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2380
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<pre style="margin: 0;">+<span id="LC2380" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">lintL</span> <span class="p">(</span><span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">eta_tvs</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Eta reduction for data families]</span></span>
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2381
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<pre style="margin: 0;">+<span id="LC2381" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- which is not about newtype axioms</span></span>
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2382
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<pre style="margin: 0;">+<span id="LC2382" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Newtype axiom has eta-tvs"</span><span class="p">)</span></span>
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2383
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<pre style="margin: 0;">+<span id="LC2383" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">lintL</span> <span class="p">(</span><span class="n" style="color: #333;">ax_role</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">Representational</span><span class="p">)</span></span>
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2384
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<pre style="margin: 0;">+<span id="LC2384" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Newtype axiom role not representational"</span><span class="p">)</span></span>
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2385
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<pre style="margin: 0;">+<span id="LC2385" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">lintL</span> <span class="p">(</span><span class="n" style="color: #333;">roles</span> <span class="p">`</span><span class="n" style="color: #333;">equalLength</span><span class="p">`</span> <span class="n" style="color: #333;">tvs</span><span class="p">)</span></span>
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2386
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<pre style="margin: 0;">+<span id="LC2386" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Newtype axiom roles list is the wrong length."</span> <span class="o" style="font-weight: 600;">$$</span></span>
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2387
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<pre style="margin: 0;">+<span id="LC2387" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"roles:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">sep</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">roles</span><span class="p">))</span></span>
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2388
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<pre style="margin: 0;">+<span id="LC2388" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">lintL</span> <span class="p">(</span><span class="n" style="color: #333;">roles</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">takeList</span> <span class="n" style="color: #333;">roles</span> <span class="p">(</span><span class="n" style="color: #333;">tyConRoles</span> <span class="n" style="color: #333;">tc</span><span class="p">))</span></span>
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2389
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<pre style="margin: 0;">+<span id="LC2389" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Newtype axiom roles do not match newtype tycon's."</span></span>
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2390
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<pre style="margin: 0;">+<span id="LC2390" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"axiom roles:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">sep</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">roles</span><span class="p">)</span></span>
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2391
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<pre style="margin: 0;">+<span id="LC2391" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"tycon roles:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">sep</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">tyConRoles</span> <span class="n" style="color: #333;">tc</span><span class="p">))</span> <span class="p">])</span></span>
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2392
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<pre style="margin: 0;">+<span id="LC2392" class="line" lang="haskell"> <span class="p">}</span></span>
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2393
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<pre style="margin: 0;">+<span id="LC2393" class="line" lang="haskell"></span>
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2394
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<pre style="margin: 0;">+<span id="LC2394" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isFamilyTyCon</span> <span class="n" style="color: #333;">tc</span></span>
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2395
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<pre style="margin: 0;">+<span id="LC2395" 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="kr" style="font-weight: 600;">if</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTypeFamilyTyCon</span> <span class="n" style="color: #333;">tc</span></span>
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2396
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<pre style="margin: 0;">+<span id="LC2396" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">lintL</span> <span class="p">(</span><span class="n" style="color: #333;">ax_role</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span><span class="p">)</span></span>
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2397
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<pre style="margin: 0;">+<span id="LC2397" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"type family axiom is not nominal"</span><span class="p">)</span></span>
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2398
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<pre style="margin: 0;">+<span id="LC2398" class="line" lang="haskell"></span>
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2399
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<pre style="margin: 0;">+<span id="LC2399" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isDataFamilyTyCon</span> <span class="n" style="color: #333;">tc</span></span>
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2400
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<pre style="margin: 0;">+<span id="LC2400" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">lintL</span> <span class="p">(</span><span class="n" style="color: #333;">ax_role</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">Representational</span><span class="p">)</span></span>
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2401
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<pre style="margin: 0;">+<span id="LC2401" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"data family axiom is not representational"</span><span class="p">)</span></span>
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2402
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<pre style="margin: 0;">+<span id="LC2402" class="line" lang="haskell"></span>
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2403
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<pre style="margin: 0;">+<span id="LC2403" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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2404
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<pre style="margin: 0;">+<span id="LC2404" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addErrL</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"A family TyCon is neither a type family nor a data family:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tc</span><span class="p">)</span></span>
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2405
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<pre style="margin: 0;">+<span id="LC2405" class="line" lang="haskell"></span>
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2406
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<pre style="margin: 0;">+<span id="LC2406" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mapM_</span> <span class="p">(</span><span class="n" style="color: #333;">lint_family_branch</span> <span class="n" style="color: #333;">tc</span><span class="p">)</span> <span class="n" style="color: #333;">branch_list</span> <span class="p">}</span></span>
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2407
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<pre style="margin: 0;">+<span id="LC2407" class="line" lang="haskell"></span>
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2408
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<pre style="margin: 0;">+<span id="LC2408" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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2409
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<pre style="margin: 0;">+<span id="LC2409" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addErrL</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Axiom tycon is neither a newtype nor a family."</span><span class="p">)</span></span>
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2410
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<pre style="margin: 0;">+<span id="LC2410" class="line" lang="haskell"></span>
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2411
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<pre style="margin: 0;">+<span id="LC2411" class="line" lang="haskell"><span class="n" style="color: #333;">lint_branch</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoAxBranch</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LintM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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2412
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<pre style="margin: 0;">+<span id="LC2412" class="line" lang="haskell"><span class="n" style="color: #333;">lint_branch</span> <span class="n" style="color: #333;">ax_tc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoAxBranch</span> <span class="p">{</span> <span class="n" style="color: #333;">cab_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tvs</span><span class="p">,</span> <span class="n" style="color: #333;">cab_cvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cvs</span></span>
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2413
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<pre style="margin: 0;">+<span id="LC2413" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cab_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lhs_args</span><span class="p">,</span> <span class="n" style="color: #333;">cab_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs</span> <span class="p">})</span></span>
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2414
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<pre style="margin: 0;">+<span id="LC2414" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lintBinders</span> <span class="kt" style="color: #458; font-weight: 600;">LambdaBind</span> <span class="p">(</span><span class="n" style="color: #333;">tvs</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">cvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span></span>
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2415
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<pre style="margin: 0;">+<span id="LC2415" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">ax_tc</span> <span class="n" style="color: #333;">lhs_args</span></span>
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2416
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<pre style="margin: 0;">+<span id="LC2416" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">lhs'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lintType</span> <span class="n" style="color: #333;">lhs</span></span>
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2417
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<pre style="margin: 0;">+<span id="LC2417" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rhs'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lintType</span> <span class="n" style="color: #333;">rhs</span></span>
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2418
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<pre style="margin: 0;">+<span id="LC2418" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">lhs_kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">typeKind</span> <span class="n" style="color: #333;">lhs'</span></span>
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2419
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<pre style="margin: 0;">+<span id="LC2419" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">typeKind</span> <span class="n" style="color: #333;">rhs'</span></span>
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2420
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<pre style="margin: 0;">+<span id="LC2420" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">lintL</span> <span class="p">(</span><span class="n" style="color: #333;">lhs_kind</span> <span class="p">`</span><span class="n" style="color: #333;">eqType</span><span class="p">`</span> <span class="n" style="color: #333;">rhs_kind</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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2421
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<pre style="margin: 0;">+<span id="LC2421" class="line" lang="haskell"> <span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Inhomogeneous axiom"</span><span class="p">)</span></span>
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2422
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<pre style="margin: 0;">+<span id="LC2422" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"lhs:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">lhs</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">lhs_kind</span> <span class="o" style="font-weight: 600;">$$</span></span>
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2423
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<pre style="margin: 0;">+<span id="LC2423" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"rhs:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">rhs</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">rhs_kind</span><span class="p">)</span> <span class="p">}</span></span>
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2424
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<pre style="margin: 0;">+<span id="LC2424" class="line" lang="haskell"></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;">-- these checks do not apply to newtype axioms</span></span>
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2426
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<pre style="margin: 0;">+<span id="LC2426" class="line" lang="haskell"><span class="n" style="color: #333;">lint_family_branch</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoAxBranch</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LintM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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2427
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<pre style="margin: 0;">+<span id="LC2427" class="line" lang="haskell"><span class="n" style="color: #333;">lint_family_branch</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">br</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoAxBranch</span> <span class="p">{</span> <span class="n" style="color: #333;">cab_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tvs</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2428" 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">
2428
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<pre style="margin: 0;">+<span id="LC2428" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cab_eta_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eta_tvs</span></span>
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2429
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<pre style="margin: 0;">+<span id="LC2429" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cab_cvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cvs</span></span>
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2430
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<pre style="margin: 0;">+<span id="LC2430" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cab_roles</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">roles</span></span>
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2431
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<pre style="margin: 0;">+<span id="LC2431" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cab_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lhs</span></span>
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2432
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<pre style="margin: 0;">+<span id="LC2432" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cab_incomps</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">incomps</span> <span class="p">})</span></span>
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2433
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<pre style="margin: 0;">+<span id="LC2433" 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;">lintL</span> <span class="p">(</span><span class="n" style="color: #333;">isDataFamilyTyCon</span> <span class="n" style="color: #333;">fam_tc</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">eta_tvs</span><span class="p">)</span></span>
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2434
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<pre style="margin: 0;">+<span id="LC2434" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Type family axiom has eta-tvs"</span><span class="p">)</span></span>
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2435
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<pre style="margin: 0;">+<span id="LC2435" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">lintL</span> <span class="p">(</span><span class="n" style="color: #333;">all</span> <span class="p">(`</span><span class="n" style="color: #333;">elemVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">tyCoVarsOfTypes</span> <span class="n" style="color: #333;">lhs</span><span class="p">)</span> <span class="n" style="color: #333;">tvs</span><span class="p">)</span></span>
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2436
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<pre style="margin: 0;">+<span id="LC2436" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Quantified variable in family axiom unused in LHS"</span><span class="p">)</span></span>
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2437
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<pre style="margin: 0;">+<span id="LC2437" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">lintL</span> <span class="p">(</span><span class="n" style="color: #333;">all</span> <span class="n" style="color: #333;">isTyFamFree</span> <span class="n" style="color: #333;">lhs</span><span class="p">)</span></span>
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2438
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<pre style="margin: 0;">+<span id="LC2438" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Type family application on LHS of family axiom"</span><span class="p">)</span></span>
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2439
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<pre style="margin: 0;">+<span id="LC2439" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">lintL</span> <span class="p">(</span><span class="n" style="color: #333;">all</span> <span class="p">(</span><span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span><span class="p">)</span> <span class="n" style="color: #333;">roles</span><span class="p">)</span></span>
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2440
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<pre style="margin: 0;">+<span id="LC2440" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Non-nominal role in family axiom"</span> <span class="o" style="font-weight: 600;">$$</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;">text</span> <span class="s" style="color: #d14;">"roles:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">sep</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">roles</span><span class="p">))</span></span>
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2442
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<pre style="margin: 0;">+<span id="LC2442" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">lintL</span> <span class="p">(</span><span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">cvs</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="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Coercion variables bound in family axiom"</span><span class="p">)</span></span>
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2444
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<pre style="margin: 0;">+<span id="LC2444" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">forM_</span> <span class="n" style="color: #333;">incomps</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">br'</span> <span class="o" style="font-weight: 600;">-></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;">lintL</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">compatible_branches</span> <span class="n" style="color: #333;">br</span> <span class="n" style="color: #333;">br'</span><span class="p">))</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="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Incorrect incompatible branch:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">br'</span> <span class="p">}</span></span>
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2447
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<pre style="margin: 0;">+<span id="LC2447" class="line" lang="haskell"></span>
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2448
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<pre style="margin: 0;">+<span id="LC2448" class="line" lang="haskell"><span class="n" style="color: #333;">lint_axiom_group</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoAxiom</span> <span class="kt" style="color: #458; font-weight: 600;">Branched</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LintM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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2449
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<pre style="margin: 0;">+<span id="LC2449" class="line" lang="haskell"><span class="n" style="color: #333;">lint_axiom_group</span> <span class="p">(</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;">[]</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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2450
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<pre style="margin: 0;">+<span id="LC2450" class="line" lang="haskell"><span class="n" style="color: #333;">lint_axiom_group</span> <span class="p">(</span><span class="n" style="color: #333;">ax</span> <span class="o" style="font-weight: 600;">:|</span> <span class="n" style="color: #333;">axs</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2451" 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;">lintL</span> <span class="p">(</span><span class="n" style="color: #333;">isOpenFamilyTyCon</span> <span class="n" style="color: #333;">tc</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2452" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Non-open-family with multiple axioms"</span><span class="p">)</span></span>
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2453
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<pre style="margin: 0;">+<span id="LC2453" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">all_pairs</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span> <span class="p">(</span><span class="n" style="color: #333;">ax1</span><span class="p">,</span> <span class="n" style="color: #333;">ax2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">ax1</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">all_axs</span></span>
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<pre style="margin: 0;">+<span id="LC2454" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ax2</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">all_axs</span> <span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC2455" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mapM_</span> <span class="p">(</span><span class="n" style="color: #333;">lint_axiom_pair</span> <span class="n" style="color: #333;">tc</span><span class="p">)</span> <span class="n" style="color: #333;">all_pairs</span> <span class="p">}</span></span>
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2456
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<pre style="margin: 0;">+<span id="LC2456" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2457
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<pre style="margin: 0;">+<span id="LC2457" class="line" lang="haskell"> <span class="n" style="color: #333;">all_axs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ax</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">axs</span></span>
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2458
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<pre style="margin: 0;">+<span id="LC2458" class="line" lang="haskell"> <span class="n" style="color: #333;">tc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">coAxiomTyCon</span> <span class="n" style="color: #333;">ax</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;">lint_axiom_pair</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;">CoAxiom</span> <span class="kt" style="color: #458; font-weight: 600;">Branched</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">CoAxiom</span> <span class="kt" style="color: #458; font-weight: 600;">Branched</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LintM</span> <span class="nb" style="color: #0086b3;">()</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;">lint_axiom_pair</span> <span class="n" style="color: #333;">tc</span> <span class="p">(</span><span class="n" style="color: #333;">ax1</span><span class="p">,</span> <span class="n" style="color: #333;">ax2</span><span class="p">)</span></span>
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2462
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<pre style="margin: 0;">+<span id="LC2462" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">br1</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoAxBranch</span> <span class="p">{</span> <span class="n" style="color: #333;">cab_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tvs1</span></span>
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2463
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<pre style="margin: 0;">+<span id="LC2463" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cab_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lhs1</span></span>
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2464
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<pre style="margin: 0;">+<span id="LC2464" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cab_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs1</span> <span class="p">})</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">coAxiomSingleBranch_maybe</span> <span class="n" style="color: #333;">ax1</span></span>
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2465
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<pre style="margin: 0;">+<span id="LC2465" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">br2</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoAxBranch</span> <span class="p">{</span> <span class="n" style="color: #333;">cab_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tvs2</span></span>
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2466
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<pre style="margin: 0;">+<span id="LC2466" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cab_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lhs2</span></span>
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2467
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<pre style="margin: 0;">+<span id="LC2467" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cab_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs2</span> <span class="p">})</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">coAxiomSingleBranch_maybe</span> <span class="n" style="color: #333;">ax2</span></span>
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2468
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<pre style="margin: 0;">+<span id="LC2468" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lintL</span> <span class="p">(</span><span class="n" style="color: #333;">compatible_branches</span> <span class="n" style="color: #333;">br1</span> <span class="n" style="color: #333;">br2</span><span class="p">)</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="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">hsep</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Axioms"</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ax1</span><span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"and"</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ax2</span></span>
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<pre style="margin: 0;">+<span id="LC2470" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"are incompatible"</span> <span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC2471" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"tvs1 ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pprTyVars</span> <span class="n" style="color: #333;">tvs1</span></span>
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<pre style="margin: 0;">+<span id="LC2472" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"lhs1 ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">lhs1</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2473" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"rhs1 ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">rhs1</span></span>
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2474
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<pre style="margin: 0;">+<span id="LC2474" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"tvs2 ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pprTyVars</span> <span class="n" style="color: #333;">tvs2</span></span>
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2475
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<pre style="margin: 0;">+<span id="LC2475" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"lhs2 ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">lhs2</span><span class="p">)</span></span>
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2476
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<pre style="margin: 0;">+<span id="LC2476" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"rhs2 ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">rhs2</span> <span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC2477" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2478" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;">+<span id="LC2479" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addErrL</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Open type family axiom has more than one branch: either"</span> <span class="o" style="font-weight: 600;"><+></span></span>
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<pre style="margin: 0;">+<span id="LC2480" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ax1</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"or"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ax2</span><span class="p">)</span></span>
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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;">compatible_branches</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CoAxBranch</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoAxBranch</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC2483" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- True <=> branches are compatible. See Note [Compatibility] in GHC.Core.FamInstEnv.</span></span>
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2484
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<pre style="margin: 0;">+<span id="LC2484" class="line" lang="haskell"><span class="n" style="color: #333;">compatible_branches</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoAxBranch</span> <span class="p">{</span> <span class="n" style="color: #333;">cab_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tvs1</span></span>
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<pre style="margin: 0;">+<span id="LC2485" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cab_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lhs1</span></span>
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<pre style="margin: 0;">+<span id="LC2486" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cab_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs1</span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC2487" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoAxBranch</span> <span class="p">{</span> <span class="n" style="color: #333;">cab_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tvs2</span></span>
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<pre style="margin: 0;">+<span id="LC2488" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cab_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lhs2</span></span>
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<pre style="margin: 0;">+<span id="LC2489" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cab_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs2</span> <span class="p">})</span></span>
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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="c1" style="color: #998; font-style: italic;">-- we need to freshen ax2 w.r.t. ax1</span></span>
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<pre style="margin: 0;">+<span id="LC2491" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- do this by pretending tvs1 are in scope when processing tvs2</span></span>
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<pre style="margin: 0;">+<span id="LC2492" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">in_scope</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkInScopeSet</span> <span class="p">(</span><span class="n" style="color: #333;">mkVarSet</span> <span class="n" style="color: #333;">tvs1</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2493" class="line" lang="haskell"> <span class="n" style="color: #333;">subst0</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkEmptyTCvSubst</span> <span class="n" style="color: #333;">in_scope</span></span>
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<pre style="margin: 0;">+<span id="LC2494" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">subst</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substTyVarBndrs</span> <span class="n" style="color: #333;">subst0</span> <span class="n" style="color: #333;">tvs2</span></span>
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<pre style="margin: 0;">+<span id="LC2495" class="line" lang="haskell"> <span class="n" style="color: #333;">lhs2'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substTys</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">lhs2</span></span>
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<pre style="margin: 0;">+<span id="LC2496" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs2'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substTy</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">rhs2</span></span>
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<pre style="margin: 0;">+<span id="LC2497" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span></span>
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<pre style="margin: 0;">+<span id="LC2498" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">tcUnifyTys</span> <span class="p">(</span><span class="n" style="color: #333;">const</span> <span class="kt" style="color: #458; font-weight: 600;">BindMe</span><span class="p">)</span> <span class="n" style="color: #333;">lhs1</span> <span class="n" style="color: #333;">lhs2'</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC2499" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">unifying_subst</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">substTy</span> <span class="n" style="color: #333;">unifying_subst</span> <span class="n" style="color: #333;">rhs1</span> <span class="p">`</span><span class="n" style="color: #333;">eqType</span><span class="p">`</span></span>
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<pre style="margin: 0;">+<span id="LC2500" class="line" lang="haskell"> <span class="n" style="color: #333;">substTy</span> <span class="n" style="color: #333;">unifying_subst</span> <span class="n" style="color: #333;">rhs2'</span></span>
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<pre style="margin: 0;">+<span id="LC2501" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</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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<pre style="margin: 0;"> <span id="LC2502" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2503" 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="LC2504" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2539,6 +2696,7 @@ data LintLocInfo</td>
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<pre style="margin: 0;"> <span id="LC2696" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">TopLevelBindings</span></span>
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<pre style="margin: 0;"> <span id="LC2697" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">InType</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="c1" style="color: #998; font-style: italic;">-- Inside a type</span></span>
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<pre style="margin: 0;"> <span id="LC2698" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">InCo</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="c1" style="color: #998; font-style: italic;">-- Inside a coercion</span></span>
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<pre style="margin: 0;">+<span id="LC2699" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">InAxiom</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoAxiom</span> <span class="kt" style="color: #458; font-weight: 600;">Branched</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Inside a CoAxiom</span></span>
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<pre style="margin: 0;"> <span id="LC2700" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2701" class="line" lang="haskell"><span class="n" style="color: #333;">initL</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;">LintFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Var</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC2702" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LintM</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;">WarnsAndErrs</span> <span class="c1" style="color: #998; font-style: italic;">-- Warnings and errors</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">@@ -2822,6 +2980,34 @@ dumpLoc (InType ty)</td>
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2822
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2980
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<pre style="margin: 0;"> <span id="LC2980" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">noSrcLoc</span><span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"In the type"</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;">ty</span><span class="p">))</span></span>
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2823
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2981
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<pre style="margin: 0;"> <span id="LC2981" class="line" lang="haskell"><span class="n" style="color: #333;">dumpLoc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">InCo</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>
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2824
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2982
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<pre style="margin: 0;"> <span id="LC2982" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">noSrcLoc</span><span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"In the coercion"</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;">co</span><span class="p">))</span></span>
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2983
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<pre style="margin: 0;">+<span id="LC2983" class="line" lang="haskell"><span class="n" style="color: #333;">dumpLoc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">InAxiom</span> <span class="n" style="color: #333;">ax</span><span class="p">)</span></span>
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2984
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<pre style="margin: 0;">+<span id="LC2984" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">getSrcLoc</span> <span class="n" style="color: #333;">ax_name</span><span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"In the coercion axiom"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ax_name</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pp_ax</span><span class="p">)</span></span>
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2985
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<pre style="margin: 0;">+<span id="LC2985" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2986
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<pre style="margin: 0;">+<span id="LC2986" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CoAxiom</span> <span class="p">{</span> <span class="n" style="color: #333;">co_ax_name</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ax_name</span></span>
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2987
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<pre style="margin: 0;">+<span id="LC2987" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">co_ax_tc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tc</span></span>
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2988
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<pre style="margin: 0;">+<span id="LC2988" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">co_ax_role</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ax_role</span></span>
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2989
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<pre style="margin: 0;">+<span id="LC2989" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">co_ax_branches</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">branches</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ax</span></span>
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2990
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<pre style="margin: 0;">+<span id="LC2990" class="line" lang="haskell"> <span class="n" style="color: #333;">branch_list</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fromBranches</span> <span class="n" style="color: #333;">branches</span></span>
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2991
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<pre style="margin: 0;">+<span id="LC2991" class="line" lang="haskell"></span>
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2992
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<pre style="margin: 0;">+<span id="LC2992" class="line" lang="haskell"> <span class="n" style="color: #333;">pp_ax</span></span>
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2993
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<pre style="margin: 0;">+<span id="LC2993" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">[</span><span class="n" style="color: #333;">branch</span><span class="p">]</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">branch_list</span></span>
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2994
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<pre style="margin: 0;">+<span id="LC2994" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pp_branch</span> <span class="n" style="color: #333;">branch</span></span>
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2995
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<pre style="margin: 0;">+<span id="LC2995" class="line" lang="haskell"></span>
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2996
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<pre style="margin: 0;">+<span id="LC2996" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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2997
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<pre style="margin: 0;">+<span id="LC2997" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">braces</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">vcat</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">pp_branch</span> <span class="n" style="color: #333;">branch_list</span><span class="p">)</span></span>
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2998
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<pre style="margin: 0;">+<span id="LC2998" class="line" lang="haskell"></span>
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2999
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<pre style="margin: 0;">+<span id="LC2999" class="line" lang="haskell"> <span class="n" style="color: #333;">pp_branch</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoAxBranch</span> <span class="p">{</span> <span class="n" style="color: #333;">cab_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tvs</span></span>
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3000
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<pre style="margin: 0;">+<span id="LC3000" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cab_cvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cvs</span></span>
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3001
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<pre style="margin: 0;">+<span id="LC3001" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cab_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lhs_tys</span></span>
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3002
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<pre style="margin: 0;">+<span id="LC3002" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cab_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="p">})</span></span>
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<td class="diff-line-num new new_line" data-linenumber="3003" 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">
3003
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<pre style="margin: 0;">+<span id="LC3003" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sep</span> <span class="p">[</span> <span class="n" style="color: #333;">brackets</span> <span class="p">(</span><span class="n" style="color: #333;">pprWithCommas</span> <span class="n" style="color: #333;">pprTyVar</span> <span class="p">(</span><span class="n" style="color: #333;">tvs</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">cvs</span><span class="p">))</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">dot</span></span>
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<td class="diff-line-num new new_line" data-linenumber="3004" 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">
3004
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<pre style="margin: 0;">+<span id="LC3004" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">lhs_tys</span><span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="3005" 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">
3005
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<pre style="margin: 0;">+<span id="LC3005" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"~_"</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">pp_role</span> <span class="n" style="color: #333;">ax_role</span></span>
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<td class="diff-line-num new new_line" data-linenumber="3006" 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">
3006
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<pre style="margin: 0;">+<span id="LC3006" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="p">]</span></span>
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3007
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<pre style="margin: 0;">+<span id="LC3007" class="line" lang="haskell"></span>
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3008
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<pre style="margin: 0;">+<span id="LC3008" class="line" lang="haskell"> <span class="n" style="color: #333;">pp_role</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"N"</span></span>
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3009
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<pre style="margin: 0;">+<span id="LC3009" class="line" lang="haskell"> <span class="n" style="color: #333;">pp_role</span> <span class="kt" style="color: #458; font-weight: 600;">Representational</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"R"</span></span>
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3010
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<pre style="margin: 0;">+<span id="LC3010" class="line" lang="haskell"> <span class="n" style="color: #333;">pp_role</span> <span class="kt" style="color: #458; font-weight: 600;">Phantom</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"P"</span></span>
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3011
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<pre style="margin: 0;"> <span id="LC3011" class="line" lang="haskell"></span>
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2826
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3012
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<pre style="margin: 0;"> <span id="LC3012" class="line" lang="haskell"><span class="n" style="color: #333;">pp_binders</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Var</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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2827
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3013
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<pre style="margin: 0;"> <span id="LC3013" class="line" lang="haskell"><span class="n" style="color: #333;">pp_binders</span> <span class="n" style="color: #333;">bs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sep</span> <span class="p">(</span><span class="n" style="color: #333;">punctuate</span> <span class="n" style="color: #333;">comma</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">pp_binder</span> <span class="n" style="color: #333;">bs</span><span class="p">))</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4bf18646acbb5a59ad8716aedc32acfe2ead0f58#4aad0050db1a8a20db8bbca149111de99cb299c9"><strong>compiler/GHC/Core/TyCon.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">@@ -293,7 +293,14 @@ See also Note [Wrappers for data instance tycons] in GHC.Types.Id.Make</td>
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293
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<pre style="margin: 0;"> <span id="LC293" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Indeed the latter type is unknown to the programmer.</span></span>
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294
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294
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<pre style="margin: 0;"> <span id="LC294" class="line" lang="haskell"></span>
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295
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295
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<pre style="margin: 0;"> <span id="LC295" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - There *is* an instance for (T Int) in the type-family instance</span></span>
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296
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<pre style="margin: 0;">-<span id="LC296" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> environment, but it is only used for overlap checking</span></span>
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296
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<pre style="margin: 0;">+<span id="LC296" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> environment, but it is looked up (via tcLookupDataFamilyInst)</span></span>
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297
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<pre style="margin: 0;">+<span id="LC297" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in can_eq_nc (via tcTopNormaliseNewTypeTF_maybe) when trying to</span></span>
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298
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<pre style="margin: 0;">+<span id="LC298" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> solve representational equalities like</span></span>
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299
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<pre style="margin: 0;">+<span id="LC299" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> T Int ~R# Bool</span></span>
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300
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<pre style="margin: 0;">+<span id="LC300" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Here we look up (T Int), convert it to R:TInt, and then unwrap the</span></span>
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301
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<pre style="margin: 0;">+<span id="LC301" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> newtype R:TInt.</span></span>
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302
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<pre style="margin: 0;">+<span id="LC302" class="line" lang="haskell"></span>
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303
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<pre style="margin: 0;">+<span id="LC303" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> It is also looked up in reduceTyFamApp_maybe.</span></span>
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297
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304
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<pre style="margin: 0;"> <span id="LC304" class="line" lang="haskell"></span>
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298
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305
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<pre style="margin: 0;"> <span id="LC305" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - It's fine to have T in the LHS of a type function:</span></span>
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299
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306
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<pre style="margin: 0;"> <span id="LC306" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type instance F (T a) = [a]</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">@@ -1251,34 +1258,21 @@ example,</td>
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<pre style="margin: 0;"> <span id="LC1258" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1259" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> newtype T a = MkT (a -> a)</span></span>
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1253
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<pre style="margin: 0;"> <span id="LC1260" class="line" lang="haskell"></span>
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1254
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<pre style="margin: 0;">-<span id="LC1254" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the NewTyCon for T will contain nt_co = CoT where CoT t : T t ~ t -> t.</span></span>
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1255
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<pre style="margin: 0;">-<span id="LC1255" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1256" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In the case that the right hand side is a type application</span></span>
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1257
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<pre style="margin: 0;">-<span id="LC1257" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">ending with the same type variables as the left hand side, we</span></span>
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<pre style="margin: 0;">-<span id="LC1258" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">"eta-contract" the coercion. So if we had</span></span>
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1259
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<pre style="margin: 0;">-<span id="LC1259" class="line" lang="haskell"></span>
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1260
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<pre style="margin: 0;">-<span id="LC1260" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> newtype S a = MkT [a]</span></span>
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1261
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<pre style="margin: 0;">-<span id="LC1261" class="line" lang="haskell"></span>
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1262
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<pre style="margin: 0;">-<span id="LC1262" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">then we would generate the arity 0 axiom CoS : S ~ []. The</span></span>
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1263
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<pre style="margin: 0;">-<span id="LC1263" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">primary reason we do this is to make newtype deriving cleaner.</span></span>
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<pre style="margin: 0;">+<span id="LC1261" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the NewTyCon for T will contain nt_co = CoT where CoT :: forall a. T a ~ a -> a.</span></span>
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<pre style="margin: 0;"> <span id="LC1262" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1265" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In the paper we'd write</span></span>
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<pre style="margin: 0;">-<span id="LC1266" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> axiom CoT : (forall t. T t) ~ (forall t. [t])</span></span>
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<pre style="margin: 0;">-<span id="LC1267" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and then when we used CoT at a particular type, s, we'd say</span></span>
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<pre style="margin: 0;">-<span id="LC1268" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> CoT @ s</span></span>
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<pre style="margin: 0;">-<span id="LC1269" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">which encodes as (TyConApp instCoercionTyCon [TyConApp CoT [], s])</span></span>
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<pre style="margin: 0;">+<span id="LC1263" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We might also eta-contract the axiom: see Note [Newtype eta].</span></span>
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<pre style="margin: 0;"> <span id="LC1264" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1265" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Newtype eta]</span></span>
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<pre style="margin: 0;"> <span id="LC1266" 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="LC1267" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider</span></span>
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<pre style="margin: 0;"> <span id="LC1268" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> newtype Parser a = MkParser (IO a) deriving Monad</span></span>
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<pre style="margin: 0;">-<span id="LC1275" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Are these two types equal (t<span class="idiff left right">o Core</span>)?</span></span>
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<pre style="margin: 0;">+<span id="LC1269" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Are these two types equal (t<span class="idiff left right">hat is, does a coercion exist between them</span>)?</span></span>
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<pre style="margin: 0;"> <span id="LC1270" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Monad Parser</span></span>
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<pre style="margin: 0;"> <span id="LC1271" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Monad IO</span></span>
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<pre style="margin: 0;"> <span id="LC1272" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">which we need to make the derived instance for Monad Parser.</span></span>
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<pre style="margin: 0;"> <span id="LC1273" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1274" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Well, yes. But to see that easily we eta-reduce the RHS type of</span></span>
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<pre style="margin: 0;">-<span id="LC1281" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Parser, in this case to <span class="idiff left right">([], Froogle)</span>, so that even unsaturated applications</span></span>
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<pre style="margin: 0;">+<span id="LC1275" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Parser, in this case to <span class="idiff left right">IO</span>, so that even unsaturated applications</span></span>
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<pre style="margin: 0;"> <span id="LC1276" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of Parser will work right. This eta reduction is done when the type</span></span>
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<pre style="margin: 0;"> <span id="LC1277" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">constructor is built, and cached in NewTyCon.</span></span>
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<pre style="margin: 0;"> <span id="LC1278" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4bf18646acbb5a59ad8716aedc32acfe2ead0f58#84c9d3ba34173297e7d7747e02caa2e004b164fc"><strong>compiler/GHC/Core/Type.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">@@ -70,7 +70,6 @@ module GHC.Core.Type (</td>
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<pre style="margin: 0;"> <span id="LC70" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">getRuntimeRep_maybe</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">kindRep_maybe</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">kindRep</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC72" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkCastTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkCoercionTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">splitCastTy_maybe</span><span class="p">,</span></span>
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73
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<pre style="margin: 0;">-<span id="LC73" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">discardCast</span><span class="p">,</span></span>
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74
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<pre style="margin: 0;"> <span id="LC73" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC74" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">userTypeError_maybe</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pprUserTypeErrorTy</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC75" 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">@@ -1402,20 +1401,6 @@ tyConBindersTyCoBinders = map to_tyb</td>
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1402
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1401
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<pre style="margin: 0;"> <span id="LC1401" class="line" lang="haskell"> <span class="n" style="color: #333;">to_tyb</span> <span class="p">(</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 class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Named</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Bndr</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">vis</span><span class="p">)</span></span>
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1403
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1402
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<pre style="margin: 0;"> <span id="LC1402" class="line" lang="haskell"> <span class="n" style="color: #333;">to_tyb</span> <span class="p">(</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;">AnonTCB</span> <span class="n" style="color: #333;">af</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Anon</span> <span class="n" style="color: #333;">af</span> <span class="p">(</span><span class="n" style="color: #333;">tymult</span> <span class="p">(</span><span class="n" style="color: #333;">varType</span> <span class="n" style="color: #333;">tv</span><span class="p">))</span></span>
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1404
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<pre style="margin: 0;"> <span id="LC1403" class="line" lang="haskell"></span>
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1405
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<pre style="margin: 0;">-<span id="LC1405" class="line" lang="haskell"><span class="cd">-- | Drop the cast on a type, if any. If there is no</span></span>
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1406
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<pre style="margin: 0;">-<span id="LC1406" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- cast, just return the original type. This is rarely what</span></span>
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1407
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<pre style="margin: 0;">-<span id="LC1407" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- you want. The CastTy data constructor (in "GHC.Core.TyCo.Rep") has the</span></span>
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1408
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<pre style="margin: 0;">-<span id="LC1408" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- invariant that another CastTy is not inside. See the</span></span>
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1409
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<pre style="margin: 0;">-<span id="LC1409" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- data constructor for a full description of this invariant.</span></span>
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1410
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<pre style="margin: 0;">-<span id="LC1410" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Since CastTy cannot be nested, the result of discardCast</span></span>
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1411
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<pre style="margin: 0;">-<span id="LC1411" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- cannot be a CastTy.</span></span>
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1412
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<pre style="margin: 0;">-<span id="LC1412" class="line" lang="haskell"><span class="n" style="color: #333;">discardCast</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span></span>
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1413
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<pre style="margin: 0;">-<span id="LC1413" class="line" lang="haskell"><span class="n" style="color: #333;">discardCast</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CastTy</span> <span class="n" style="color: #333;">ty</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;">ASSERT</span><span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isCastTy</span> <span class="n" style="color: #333;">ty</span><span class="p">))</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">-<span id="LC1414" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC1415" class="line" lang="haskell"> <span class="n" style="color: #333;">isCastTy</span> <span class="kt" style="color: #458; font-weight: 600;">CastTy</span><span class="p">{}</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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<pre style="margin: 0;">-<span id="LC1416" class="line" lang="haskell"> <span class="n" style="color: #333;">isCastTy</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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<pre style="margin: 0;">-<span id="LC1417" class="line" lang="haskell"><span class="n" style="color: #333;">discardCast</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">-<span id="LC1418" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1404" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1405" 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="LC1406" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">--------------------------------------------------------------------</span></span>
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<li id="9355bef855426caf5f526925edf351b20f9a86c4">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4bf18646acbb5a59ad8716aedc32acfe2ead0f58#9355bef855426caf5f526925edf351b20f9a86c4"><strong>compiler/GHC/Tc/Gen/HsType.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -46,7 +46,8 @@ module GHC.Tc.Gen.HsType (</td>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcNamedWildCardBinders</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcHsLiftedType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcHsOpenType</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcHsLiftedTypeNC</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcHsOpenTypeNC</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC49" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcInferLHsType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcInferLHsTypeUnsaturated</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcCheckLHsType</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC49" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcInferLHsTypeKind</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcInferLHsType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcInferLHsTypeUnsaturated</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC50" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcCheckLHsType</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcHsMbContext</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcHsContext</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcLHsPredType</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;">failIfEmitsConstraints</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">solveEqualities</span><span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">-- useful re-export</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">@@ -77,6 +78,7 @@ import GHC.Tc.Types.Origin</td>
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<pre style="margin: 0;"> <span id="LC78" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Predicate</span></span>
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<pre style="margin: 0;"> <span id="LC79" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types.Constraint</span></span>
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<pre style="margin: 0;"> <span id="LC80" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Env</span></span>
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<pre style="margin: 0;">+<span id="LC81" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Instantiate</span><span class="p">(</span> <span class="n" style="color: #333;">tcInstInvisibleTyBinders</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC82" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.TcMType</span></span>
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<pre style="margin: 0;"> <span id="LC83" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Validity</span></span>
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84
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<pre style="margin: 0;"> <span id="LC84" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Unify</span></span>
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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">@@ -87,7 +89,7 @@ import GHC.Core.TyCo.Rep</td>
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89
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<pre style="margin: 0;"> <span id="LC89" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCo.Ppr</span></span>
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90
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<pre style="margin: 0;"> <span id="LC90" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Errors</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">reportAllUnsolved</span> <span class="p">)</span></span>
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89
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91
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<pre style="margin: 0;"> <span id="LC91" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.TcType</span></span>
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<pre style="margin: 0;">-<span id="LC90" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Instantiate</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">tcInstInvisibleTyBinders</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcInstInvisibleTyBinder</span> <span class="p">)</span></span>
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92
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<pre style="margin: 0;">+<span id="LC92" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Instantiate</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">tcInstInvisibleTyBinders<span class="idiff left right">N</span></span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcInstInvisibleTyBinder</span> <span class="p">)</span></span>
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91
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<pre style="margin: 0;"> <span id="LC93" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Type</span></span>
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<pre style="margin: 0;"> <span id="LC94" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Builtin.Types.Prim</span></span>
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<pre style="margin: 0;"> <span id="LC95" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Name.Env</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">@@ -617,12 +619,11 @@ tcHsOpenType, tcHsLiftedType,</td>
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<pre style="margin: 0;"> <span id="LC619" class="line" lang="haskell"> <span class="n" style="color: #333;">tcHsOpenTypeNC</span><span class="p">,</span> <span class="n" style="color: #333;">tcHsLiftedTypeNC</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span></span>
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618
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620
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<pre style="margin: 0;"> <span id="LC620" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Used for type signatures</span></span>
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619
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621
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<pre style="margin: 0;"> <span id="LC621" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Do not do validity checking</span></span>
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<pre style="margin: 0;">-<span id="LC620" class="line" lang="haskell"><span class="n" style="color: #333;">tcHsOpenType</span> <span class="n" style="color: #333;"><span class="idiff left">ty</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">addTypeCtxt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tcHsOpenTypeNC</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">-<span id="LC621" class="line" lang="haskell"><span class="n" style="color: #333;">tcHsLiftedType</span> <span class="n" style="color: #333;"><span class="idiff left">ty</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">addTypeCtxt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tcHsLiftedTypeNC</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC622" class="line" lang="haskell"><span class="n" style="color: #333;">tcHsOpenType</span> <span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff">hs_ty</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">addTypeCtxt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">hs_ty</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tcHsOpenTypeNC</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">hs_</span>ty</span></span>
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<pre style="margin: 0;">+<span id="LC623" class="line" lang="haskell"><span class="n" style="color: #333;">tcHsLiftedType</span> <span class="n" style="color: #333;"><span class="idiff left">hs_ty</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">addTypeCtxt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">hs_ty</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tcHsLiftedTypeNC</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">hs_</span>ty</span></span>
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<pre style="margin: 0;"> <span id="LC624" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC623" class="line" lang="haskell"><span class="n" style="color: #333;">tcHsOpenTypeNC</span> <span class="n" style="color: #333;">ty</span> <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;">ek</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newOpenTypeKind</span></span>
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<pre style="margin: 0;">-<span id="LC624" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tcLHsType</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">ek</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC625" class="line" lang="haskell"><span class="n" style="color: #333;">tcHsLiftedTypeNC</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcLHsType</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">liftedTypeKind</span></span>
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<pre style="margin: 0;">+<span id="LC625" class="line" lang="haskell"><span class="n" style="color: #333;">tcHsOpenTypeNC</span> <span class="n" style="color: #333;">hs_ty</span> <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;">ek</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newOpenTypeKind</span><span class="p">;</span> <span class="n" style="color: #333;">tcLHsType</span> <span class="n" style="color: #333;">hs_ty</span> <span class="n" style="color: #333;">ek</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC626" class="line" lang="haskell"><span class="n" style="color: #333;">tcHsLiftedTypeNC</span> <span class="n" style="color: #333;">hs_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcLHsType</span> <span class="n" style="color: #333;">hs_ty</span> <span class="n" style="color: #333;">liftedTypeKind</span></span>
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<pre style="margin: 0;"> <span id="LC627" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC628" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Like tcHsType, but takes an expected kind</span></span>
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<pre style="margin: 0;"> <span id="LC629" class="line" lang="haskell"><span class="n" style="color: #333;">tcCheckLHsType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ContextKind</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</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">@@ -632,15 +633,24 @@ tcCheckLHsType hs_ty exp_kind</td>
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<pre style="margin: 0;"> <span id="LC633" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tcLHsType</span> <span class="n" style="color: #333;">hs_ty</span> <span class="n" style="color: #333;">ek</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC634" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC635" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferLHsType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span></span>
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<pre style="margin: 0;">-<span id="LC635" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Called from outside: set the context</span></span>
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<pre style="margin: 0;"> <span id="LC636" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferLHsType</span> <span class="n" style="color: #333;">hs_ty</span></span>
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<pre style="margin: 0;">-<span id="LC637" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addTypeCtxt</span> <span class="n" style="color: #333;">hs_ty</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC638" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">ty</span><span class="p">,</span> <span class="n" style="color: #333;">_kind</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tc_infer_lhs_type</span> <span class="p">(</span><span class="n" style="color: #333;">mkMode</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span><span class="p">)</span> <span class="n" style="color: #333;">hs_ty</span></span>
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<pre style="margin: 0;">+<span id="LC637" 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="p">(</span><span class="n" style="color: #333;">ty</span><span class="p">,</span><span class="n" style="color: #333;">_kind</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInferLHsTypeKind</span> <span class="n" style="color: #333;">hs_ty</span></span>
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<pre style="margin: 0;"> <span id="LC638" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">ty</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC639" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC640" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferLHsTypeKind</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcKind</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC641" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Called from outside: set the context</span></span>
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<pre style="margin: 0;">+<span id="LC642" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Eagerly instantiate any trailing invisible binders</span></span>
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<pre style="margin: 0;">+<span id="LC643" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferLHsTypeKind</span> <span class="n" style="color: #333;">lhs_ty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">hs_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC644" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addTypeCtxt</span> <span class="n" style="color: #333;">lhs_ty</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC645" class="line" lang="haskell"> <span class="n" style="color: #333;">setSrcSpan</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">$</span> <span class="c1" style="color: #998; font-style: italic;">-- Cover the tcInstInvisibleTyBinders</span></span>
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<pre style="margin: 0;">+<span id="LC646" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">res_ty</span><span class="p">,</span> <span class="n" style="color: #333;">res_kind</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tc_infer_hs_type</span> <span class="p">(</span><span class="n" style="color: #333;">mkMode</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span><span class="p">)</span> <span class="n" style="color: #333;">hs_ty</span></span>
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<pre style="margin: 0;">+<span id="LC647" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tcInstInvisibleTyBinders</span> <span class="n" style="color: #333;">res_ty</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="LC648" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Do not always instantiate eagerly in types]</span></span>
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<pre style="margin: 0;">+<span id="LC649" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC650" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Used to check the argument of GHCi :kind</span></span>
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<pre style="margin: 0;"> <span id="LC651" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Allow and report wildcards, e.g. :kind T _</span></span>
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<pre style="margin: 0;"> <span id="LC652" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Do not saturate family applications: see Note [Dealing with :kind]</span></span>
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<pre style="margin: 0;">+<span id="LC653" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Does not instantiate eagerly; See Note [Do not always instantiate eagerly in types]</span></span>
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<pre style="margin: 0;"> <span id="LC654" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferLHsTypeUnsaturated</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcKind</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC655" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferLHsTypeUnsaturated</span> <span class="n" style="color: #333;">hs_ty</span></span>
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<pre style="margin: 0;"> <span id="LC656" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addTypeCtxt</span> <span class="n" style="color: #333;">hs_ty</span> <span class="o" style="font-weight: 600;">$</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -674,6 +684,19 @@ to switch off saturation.</td>
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<pre style="margin: 0;"> <span id="LC684" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So tcInferLHsTypeUnsaturated does a little special case for top level</span></span>
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<pre style="margin: 0;"> <span id="LC685" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">applications. Actually the common case is a bare variable, as above.</span></span>
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<pre style="margin: 0;"> <span id="LC686" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC687" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Do not always instantiate eagerly in types]</span></span>
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<pre style="margin: 0;">+<span id="LC688" 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="LC689" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Terms are eagerly instantiated. This means that if you say</span></span>
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<pre style="margin: 0;">+<span id="LC690" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC691" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> x = id</span></span>
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692
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<pre style="margin: 0;">+<span id="LC692" class="line" lang="haskell"></span>
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693
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<pre style="margin: 0;">+<span id="LC693" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">then `id` gets instantiated to have type alpha -> alpha. The variable</span></span>
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<pre style="margin: 0;">+<span id="LC694" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">alpha is then unconstrained and regeneralized. But we cannot do this</span></span>
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<pre style="margin: 0;">+<span id="LC695" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in types, as we have no type-level lambda. So, when we are sure</span></span>
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<pre style="margin: 0;">+<span id="LC696" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that we will not want to regeneralize later -- because we are done</span></span>
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<pre style="margin: 0;">+<span id="LC697" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">checking a type, for example -- we can instantiate. But we do not</span></span>
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<pre style="margin: 0;">+<span id="LC698" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">instantiate at variables, nor do we in tcInferLHsTypeUnsaturated,</span></span>
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<pre style="margin: 0;">+<span id="LC699" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">which is used by :kind in GHCi.</span></span>
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700
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<pre style="margin: 0;"> <span id="LC700" class="line" lang="haskell"></span>
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701
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<pre style="margin: 0;"> <span id="LC701" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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679
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702
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<pre style="margin: 0;"> <span id="LC702" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1648,14 +1671,14 @@ saturateFamApp :: TcType -> TcKind -> TcM (TcType, TcKind)</td>
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1671
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<pre style="margin: 0;"> <span id="LC1671" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- tcTypeKind ty = kind</span></span>
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1649
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1672
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<pre style="margin: 0;"> <span id="LC1672" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1650
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1673
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<pre style="margin: 0;"> <span id="LC1673" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If 'ty' is an unsaturated family application with trailing</span></span>
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1651
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<pre style="margin: 0;">-<span id="LC1651" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- invisible arguments, instant<span class="idiff left right">t</span>iate them.</span></span>
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1674
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<pre style="margin: 0;">+<span id="LC1674" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- invisible arguments, instantiate them.</span></span>
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1652
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1675
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<pre style="margin: 0;"> <span id="LC1675" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [saturateFamApp]</span></span>
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1653
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1676
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<pre style="margin: 0;"> <span id="LC1676" class="line" lang="haskell"></span>
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1654
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1677
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<pre style="margin: 0;"> <span id="LC1677" class="line" lang="haskell"><span class="n" style="color: #333;">saturateFamApp</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">kind</span></span>
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1655
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1678
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<pre style="margin: 0;"> <span id="LC1678" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">tc</span><span class="p">,</span> <span class="n" style="color: #333;">args</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSplitTyConApp_maybe</span> <span class="n" style="color: #333;">ty</span></span>
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1656
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1679
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<pre style="margin: 0;"> <span id="LC1679" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">mustBeSaturated</span> <span class="n" style="color: #333;">tc</span></span>
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1657
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1680
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<pre style="margin: 0;"> <span id="LC1680" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">n_to_inst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyConArity</span> <span class="n" style="color: #333;">tc</span> <span class="o" style="font-weight: 600;">-</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">args</span></span>
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1658
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<td class="diff-line-num new_line old" data-linenumber="1681" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1658" 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="p">(</span><span class="n" style="color: #333;">extra_args</span><span class="p">,</span> <span class="n" style="color: #333;">ki'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInstInvisibleTyBinders</span> <span class="n" style="color: #333;">n_to_inst</span> <span class="n" style="color: #333;">kind</span></span>
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1681
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<pre style="margin: 0;">+<span id="LC1681" 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="p">(</span><span class="n" style="color: #333;">extra_args</span><span class="p">,</span> <span class="n" style="color: #333;">ki'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInstInvisibleTyBinders<span class="idiff left right">N</span></span> <span class="n" style="color: #333;">n_to_inst</span> <span class="n" style="color: #333;">kind</span></span>
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1659
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1682
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<pre style="margin: 0;"> <span id="LC1682" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">ty</span> <span class="p">`</span><span class="n" style="color: #333;">mkTcAppTys</span><span class="p">`</span> <span class="n" style="color: #333;">extra_args</span><span class="p">,</span> <span class="n" style="color: #333;">ki'</span><span class="p">)</span> <span class="p">}</span></span>
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1660
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<td class="diff-line-num new_line" data-linenumber="1683" 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">
1683
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<pre style="margin: 0;"> <span id="LC1683" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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1661
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1684
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<pre style="margin: 0;"> <span id="LC1684" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">ty</span><span class="p">,</span> <span class="n" style="color: #333;">kind</span><span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1712" 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="1735" 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">@@ -1712,7 +1735,7 @@ checkExpectedKind :: HasDebugCallStack</td>
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1712
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1735
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<pre style="margin: 0;"> <span id="LC1735" class="line" lang="haskell"><span class="n" style="color: #333;">checkExpectedKind</span> <span class="n" style="color: #333;">hs_ty</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">act_kind</span> <span class="n" style="color: #333;">exp_kind</span></span>
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1713
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1736
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<pre style="margin: 0;"> <span id="LC1736" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"checkExpectedKind"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">act_kind</span><span class="p">)</span></span>
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1714
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1737
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<pre style="margin: 0;"> <span id="LC1737" class="line" lang="haskell"></span>
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1715
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<pre style="margin: 0;">-<span id="LC1715" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">new_args</span><span class="p">,</span> <span class="n" style="color: #333;">act_kind'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInstInvisibleTyBinders</span> <span class="n" style="color: #333;">n_to_inst</span> <span class="n" style="color: #333;">act_kind</span></span>
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1738
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<pre style="margin: 0;">+<span id="LC1738" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">new_args</span><span class="p">,</span> <span class="n" style="color: #333;">act_kind'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInstInvisibleTyBinders<span class="idiff left right">N</span></span> <span class="n" style="color: #333;">n_to_inst</span> <span class="n" style="color: #333;">act_kind</span></span>
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1716
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1739
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<pre style="margin: 0;"> <span id="LC1739" class="line" lang="haskell"></span>
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1717
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1740
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<pre style="margin: 0;"> <span id="LC1740" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">origin</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TypeEqOrigin</span> <span class="p">{</span> <span class="n" style="color: #333;">uo_actual</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">act_kind'</span></span>
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1718
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1741
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<pre style="margin: 0;"> <span id="LC1741" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">uo_expected</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">exp_kind</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1763" 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="1786" 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">@@ -1763,6 +1786,7 @@ tc_lhs_pred mode pred = tc_lhs_type mode pred constraintKind</td>
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1763
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1786
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<pre style="margin: 0;"> <span id="LC1786" class="line" lang="haskell"><span class="n" style="color: #333;">tcTyVar</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyMode</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcKind</span><span class="p">)</span></span>
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1764
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1787
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<pre style="margin: 0;"> <span id="LC1787" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Type checking recursive type and class declarations]</span></span>
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1765
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1788
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<pre style="margin: 0;"> <span id="LC1788" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- in GHC.Tc.TyCl</span></span>
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1789
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<pre style="margin: 0;">+<span id="LC1789" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This does not instantiate. See Note [Do not always instantiate eagerly in types]</span></span>
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1766
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<pre style="margin: 0;"> <span id="LC1790" class="line" lang="haskell"><span class="n" style="color: #333;">tcTyVar</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">name</span> <span class="c1" style="color: #998; font-style: italic;">-- Could be a tyvar, a tycon, or a datacon</span></span>
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<pre style="margin: 0;"> <span id="LC1791" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"lk1"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">name</span><span class="p">)</span></span>
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1792
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<pre style="margin: 0;"> <span id="LC1792" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">thing</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcLookup</span> <span class="n" style="color: #333;">name</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">@@ -3293,12 +3317,18 @@ data DataSort</td>
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3293
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3317
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<pre style="margin: 0;"> <span id="LC3317" 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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3294
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3318
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<pre style="margin: 0;"> <span id="LC3318" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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3295
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3319
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<pre style="margin: 0;"> <span id="LC3319" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See also Note [Datatype return kinds] in "GHC.Tc.TyCl"</span></span>
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3296
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<pre style="margin: 0;">-<span id="LC3296" 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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3297
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<pre style="margin: 0;">-<span id="LC3297" 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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3298
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<pre style="margin: 0;">-<span id="LC3298" 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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3299
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<pre style="margin: 0;">-<span id="LC3299" class="line" lang="haskell"> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"checkDataKindSig"</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="LC3300" 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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<pre style="margin: 0;">+<span id="LC3320" 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="c1" style="color: #998; font-style: italic;">-- any arguments in the kind are stripped off</span></span>
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<pre style="margin: 0;">+<span id="LC3321" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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3322
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<pre style="margin: 0;">+<span id="LC3322" 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>
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3323
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<pre style="margin: 0;">+<span id="LC3323" 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;">dflags</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getDynFlags</span></span>
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3324
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<pre style="margin: 0;">+<span id="LC3324" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"checkDataKindSig"</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="LC3325" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">checkTc</span> <span class="p">(</span><span class="n" style="color: #333;">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>
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<pre style="margin: 0;">+<span id="LC3326" class="line" lang="haskell"> <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 class="p">}</span></span>
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3327
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<pre style="margin: 0;"> <span id="LC3327" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC3328" class="line" lang="haskell"> <span class="n" style="color: #333;">res_kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">snd</span> <span class="p">(</span><span class="n" style="color: #333;">tcSplitPiTys</span> <span class="n" style="color: #333;">kind</span><span class="p">)</span></span>
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3329
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<pre style="margin: 0;">+<span id="LC3329" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Look for the result kind after</span></span>
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3330
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<pre style="margin: 0;">+<span id="LC3330" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- peeling off any foralls and arrows</span></span>
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3331
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<pre style="margin: 0;">+<span id="LC3331" class="line" lang="haskell"></span>
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3302
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3332
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<pre style="margin: 0;"> <span id="LC3332" 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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<pre style="margin: 0;"> <span id="LC3333" 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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3304
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3334
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<pre style="margin: 0;"> <span id="LC3334" 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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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -3335,16 +3365,19 @@ checkDataKindSig data_sort kind = do</td>
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3335
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3365
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<pre style="margin: 0;"> <span id="LC3365" 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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3366
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<pre style="margin: 0;"> <span id="LC3366" class="line" lang="haskell"></span>
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3337
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3367
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<pre style="margin: 0;"> <span id="LC3367" 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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<pre style="margin: 0;">-<span id="LC3338" 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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<pre style="margin: 0;">+<span id="LC3368" 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;">res_kind</span></span>
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<pre style="margin: 0;">+<span id="LC3369" class="line" lang="haskell"></span>
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3370
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<pre style="margin: 0;">+<span id="LC3370" 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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<pre style="margin: 0;">+<span id="LC3371" 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;">tcIsLiftedTypeKind</span> <span class="n" style="color: #333;">res_kind</span></span>
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3339
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<pre style="margin: 0;"> <span id="LC3372" class="line" lang="haskell"></span>
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3340
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3373
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<pre style="margin: 0;"> <span id="LC3373" 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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3341
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3374
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<pre style="margin: 0;"> <span id="LC3374" 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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3342
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<pre style="margin: 0;">-<span id="LC3342" 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;"><span class="idiff left">tcIsLiftedTypeKind</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">kind</span></span></span>
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<pre style="margin: 0;">+<span id="LC3375" 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;"><span class="idiff left right">is_Type</span></span></span>
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3343
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3376
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<pre style="margin: 0;"> <span id="LC3376" class="line" lang="haskell"></span>
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3344
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3377
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<pre style="margin: 0;"> <span id="LC3377" 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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3345
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3378
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<pre style="margin: 0;"> <span id="LC3378" 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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<pre style="margin: 0;"> <span id="LC3379" 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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3347
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<pre style="margin: 0;">-<span id="LC3347" 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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3380
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<pre style="margin: 0;">+<span id="LC3380" 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;"><span class="idiff left right">res_</span>kind</span><span class="p">)</span></span>
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3348
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3381
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<pre style="margin: 0;"> <span id="LC3381" 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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3349
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3382
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<pre style="margin: 0;"> <span id="LC3382" class="line" lang="haskell"></span>
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3383
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<pre style="margin: 0;"> <span id="LC3383" 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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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="3386" 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">@@ -3353,7 +3386,7 @@ checkDataKindSig data_sort kind = do</td>
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3353
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3386
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<pre style="margin: 0;"> <span id="LC3386" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"has non-"</span> <span class="o" style="font-weight: 600;"><></span></span>
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3354
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3387
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<pre style="margin: 0;"> <span id="LC3387" 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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3355
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3388
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<pre style="margin: 0;"> <span id="LC3388" 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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3356
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<pre style="margin: 0;">-<span id="LC3356" 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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<pre style="margin: 0;">+<span id="LC3389" 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;"><span class="idiff left right">res_</span>kind</span><span class="p">)</span> <span class="p">])</span></span>
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3357
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<pre style="margin: 0;"> <span id="LC3390" 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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3358
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3391
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<pre style="margin: 0;"> <span id="LC3391" 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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3359
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3392
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<pre style="margin: 0;"> <span id="LC3392" 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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<li id="07389a8f0516c26409d86f6bb651ed00759b5d4c">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4bf18646acbb5a59ad8716aedc32acfe2ead0f58#07389a8f0516c26409d86f6bb651ed00759b5d4c"><strong>compiler/GHC/Tc/Instance/Family.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">@@ -18,7 +18,6 @@ import GHC.Driver.Types</td>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.FamInstEnv</span></span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.InstEnv</span><span class="p">(</span> <span class="n" style="color: #333;">roughMatchTcs</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Coercion</span></span>
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<pre style="margin: 0;">-<span id="LC21" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Lint</span></span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types.Evidence</span></span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Iface.Load</span></span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Monad</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -162,34 +161,13 @@ addressed yet.</td>
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<pre style="margin: 0;"> <span id="LC161" class="line" lang="haskell"><span class="n" style="color: #333;">newFamInst</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FamFlavor</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoAxiom</span> <span class="kt" style="color: #458; font-weight: 600;">Unbranched</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">FamInst</span></span>
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<pre style="margin: 0;"> <span id="LC162" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Freshen the type variables of the FamInst branches</span></span>
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<pre style="margin: 0;"> <span id="LC163" class="line" lang="haskell"><span class="n" style="color: #333;">newFamInst</span> <span class="n" style="color: #333;">flavor</span> <span class="n" style="color: #333;">axiom</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoAxiom</span> <span class="p">{</span> <span class="n" style="color: #333;">co_ax_tc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fam_tc</span> <span class="p">})</span></span>
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<pre style="margin: 0;">-<span id="LC165" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT2</span><span class="p">(</span> <span class="n" style="color: #333;">tyCoVarsOfTypes</span> <span class="n" style="color: #333;">lhs</span> <span class="p">`</span><span class="n" style="color: #333;">subVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">tcv_set</span><span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"lhs"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pp_ax</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC166" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ASSERT2</span><span class="p">(</span> <span class="n" style="color: #333;">lhs_kind</span> <span class="p">`</span><span class="n" style="color: #333;">eqType</span><span class="p">`</span> <span class="n" style="color: #333;">rhs_kind</span><span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"kind"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pp_ax</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">lhs_kind</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">rhs_kind</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC167" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We used to have an assertion that the tyvars of the RHS were bound</span></span>
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<pre style="margin: 0;">-<span id="LC168" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- by tcv_set, but in error situations like F Int = a that isn't</span></span>
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<pre style="margin: 0;">-<span id="LC169" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- true; a later check in checkValidFamInst rejects it</span></span>
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<pre style="margin: 0;">-<span id="LC170" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">subst</span><span class="p">,</span> <span class="n" style="color: #333;">tvs'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">freshenTyVarBndrs</span> <span class="n" style="color: #333;">tvs</span></span>
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<pre style="margin: 0;">+<span id="LC164" 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>
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<pre style="margin: 0;">+<span id="LC165" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Freshen the type variables</span></span>
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<pre style="margin: 0;">+<span id="LC166" 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;">tvs'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">freshenTyVarBndrs</span> <span class="n" style="color: #333;">tvs</span></span>
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<pre style="margin: 0;"> <span id="LC167" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">subst</span><span class="p">,</span> <span class="n" style="color: #333;">cvs'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">freshenCoVarBndrsX</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">cvs</span></span>
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<pre style="margin: 0;">-<span id="LC172" 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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<pre style="margin: 0;"> <span id="LC168" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">lhs'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substTys</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">lhs</span></span>
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<pre style="margin: 0;"> <span id="LC169" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substTy</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;">-<span id="LC175" class="line" lang="haskell"> <span class="n" style="color: #333;">tcvs'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tvs'</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">cvs'</span></span>
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<pre style="margin: 0;">-<span id="LC176" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">ifErrsM</span> <span class="p">(</span><span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="c1" style="color: #998; font-style: italic;">-- Don't lint when there are errors, because</span></span>
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177
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<pre style="margin: 0;">-<span id="LC177" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- errors might mean TcTyCons.</span></span>
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178
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<pre style="margin: 0;">-<span id="LC178" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Recover from validity error] in GHC.Tc.TyCl</span></span>
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179
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<pre style="margin: 0;">-<span id="LC179" class="line" lang="haskell"> <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">gopt</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_DoCoreLinting</span> <span class="n" style="color: #333;">dflags</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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180
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<pre style="margin: 0;">-<span id="LC180" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Check that the types involved in this instance are well formed.</span></span>
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181
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<pre style="margin: 0;">-<span id="LC181" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Do /not/ expand type synonyms, for the reasons discussed in</span></span>
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182
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<pre style="margin: 0;">-<span id="LC182" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Linting type synonym applications].</span></span>
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183
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<pre style="margin: 0;">-<span id="LC183" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lintTypes</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">tcvs'</span> <span class="p">(</span><span class="n" style="color: #333;">rhs'</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">lhs'</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span></span>
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184
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<pre style="margin: 0;">-<span id="LC184" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="nb" style="color: #0086b3;">()</span></span>
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185
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<pre style="margin: 0;">-<span id="LC185" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">fail_msg</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"Core Lint error in newFamInst"</span> <span class="o" style="font-weight: 600;">$</span></span>
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186
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<pre style="margin: 0;">-<span id="LC186" class="line" lang="haskell"> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">fail_msg</span></span>
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187
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<pre style="margin: 0;">-<span id="LC187" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fam_tc</span></span>
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188
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<pre style="margin: 0;">-<span id="LC188" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">subst</span></span>
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189
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<pre style="margin: 0;">-<span id="LC189" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tvs'</span></span>
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190
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<pre style="margin: 0;">-<span id="LC190" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cvs'</span></span>
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191
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<pre style="margin: 0;">-<span id="LC191" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">lhs'</span></span>
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192
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<pre style="margin: 0;">-<span id="LC192" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">rhs'</span> <span class="p">]</span></span>
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170
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<pre style="margin: 0;">+<span id="LC170" class="line" lang="haskell"></span>
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193
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171
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<pre style="margin: 0;"> <span id="LC171" 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;">FamInst</span> <span class="p">{</span> <span class="n" style="color: #333;">fi_fam</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyConName</span> <span class="n" style="color: #333;">fam_tc</span></span>
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194
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172
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<pre style="margin: 0;"> <span id="LC172" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fi_flavor</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">flavor</span></span>
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195
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173
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<pre style="margin: 0;"> <span id="LC173" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fi_tcs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">roughMatchTcs</span> <span class="n" style="color: #333;">lhs</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">@@ -199,10 +177,6 @@ newFamInst flavor axiom@(CoAxiom { co_ax_tc = fam_tc })</td>
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199
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<pre style="margin: 0;"> <span id="LC177" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fi_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs'</span></span>
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200
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<pre style="margin: 0;"> <span id="LC178" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fi_axiom</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">axiom</span> <span class="p">})</span> <span class="p">}</span></span>
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201
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179
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<pre style="margin: 0;"> <span id="LC179" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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202
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<pre style="margin: 0;">-<span id="LC202" class="line" lang="haskell"> <span class="n" style="color: #333;">lhs_kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcTypeKind</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">lhs</span><span class="p">)</span></span>
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203
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<pre style="margin: 0;">-<span id="LC203" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcTypeKind</span> <span class="n" style="color: #333;">rhs</span></span>
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204
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<pre style="margin: 0;">-<span id="LC204" class="line" lang="haskell"> <span class="n" style="color: #333;">tcv_set</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkVarSet</span> <span class="p">(</span><span class="n" style="color: #333;">tvs</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">cvs</span><span class="p">)</span></span>
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205
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<pre style="margin: 0;">-<span id="LC205" class="line" lang="haskell"> <span class="n" style="color: #333;">pp_ax</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprCoAxiom</span> <span class="n" style="color: #333;">axiom</span></span>
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206
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<pre style="margin: 0;"> <span id="LC180" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CoAxBranch</span> <span class="p">{</span> <span class="n" style="color: #333;">cab_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tvs</span></span>
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207
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<pre style="margin: 0;"> <span id="LC181" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cab_cvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cvs</span></span>
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<pre style="margin: 0;"> <span id="LC182" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cab_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lhs</span></span>
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<li id="e65390fa5a32c453a81a1c9a3e1c4464d155ca4a">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4bf18646acbb5a59ad8716aedc32acfe2ead0f58#e65390fa5a32c453a81a1c9a3e1c4464d155ca4a"><strong>compiler/GHC/Tc/Module.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">@@ -268,6 +268,14 @@ tcRnModuleTcRnM hsc_env mod_sum</td>
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268
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<pre style="margin: 0;"> <span id="LC268" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">tcRnHsBootDecls</span> <span class="n" style="color: #333;">hsc_src</span> <span class="n" style="color: #333;">local_decls</span></span>
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<pre style="margin: 0;"> <span id="LC269" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="cp" style="color: #999; font-weight: 600;">{-# SCC "tcRnSrcDecls" #-}</span></span>
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<pre style="margin: 0;"> <span id="LC270" class="line" lang="haskell"> <span class="n" style="color: #333;">tcRnSrcDecls</span> <span class="n" style="color: #333;">explicit_mod_hdr</span> <span class="n" style="color: #333;">local_decls</span> <span class="n" style="color: #333;">export_ies</span></span>
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271
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<pre style="margin: 0;">+<span id="LC271" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC272" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">whenM</span> <span class="p">(</span><span class="n" style="color: #333;">goptM</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_DoCoreLinting</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC273" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">warns</span><span class="p">,</span> <span class="n" style="color: #333;">errs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lintGblEnv</span> <span class="p">(</span><span class="n" style="color: #333;">hsc_dflags</span> <span class="n" style="color: #333;">hsc_env</span><span class="p">)</span> <span class="n" style="color: #333;">tcg_env</span></span>
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<pre style="margin: 0;">+<span id="LC274" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mapBagM_</span> <span class="p">(</span><span class="n" style="color: #333;">addWarn</span> <span class="kt" style="color: #458; font-weight: 600;">NoReason</span><span class="p">)</span> <span class="n" style="color: #333;">warns</span></span>
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<pre style="margin: 0;">+<span id="LC275" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mapBagM_</span> <span class="n" style="color: #333;">addErr</span> <span class="n" style="color: #333;">errs</span></span>
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<pre style="margin: 0;">+<span id="LC276" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">failIfErrsM</span> <span class="p">}</span> <span class="c1" style="color: #998; font-style: italic;">-- if we have a lint error, we're only</span></span>
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<pre style="margin: 0;">+<span id="LC277" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- going to get in deeper trouble by proceeding</span></span>
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<pre style="margin: 0;">+<span id="LC278" class="line" lang="haskell"></span>
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279
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<pre style="margin: 0;"> <span id="LC279" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">setGblEnv</span> <span class="n" style="color: #333;">tcg_env</span></span>
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272
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280
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<pre style="margin: 0;"> <span id="LC280" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="c1" style="color: #998; font-style: italic;">-- Process the export list</span></span>
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273
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281
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<pre style="margin: 0;"> <span id="LC281" class="line" lang="haskell"> <span class="n" style="color: #333;">traceRn</span> <span class="s" style="color: #d14;">"rn4a: before exports"</span> <span class="n" style="color: #333;">empty</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2904" 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">@@ -2896,7 +2904,7 @@ pprTcGblEnv (TcGblEnv { tcg_type_env = type_env,</td>
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2896
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2904
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<pre style="margin: 0;"> <span id="LC2904" class="line" lang="haskell"> <span class="n" style="color: #333;">pprUFM</span> <span class="p">(</span><span class="n" style="color: #333;">imp_dep_mods</span> <span class="n" style="color: #333;">imports</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">sort</span><span class="p">)</span></span>
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2897
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2905
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<pre style="margin: 0;"> <span id="LC2905" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Dependent packages:"</span> <span class="o" style="font-weight: 600;"><+></span></span>
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2898
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2906
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<pre style="margin: 0;"> <span id="LC2906" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">S</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">toList</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">imp_dep_pkgs</span> <span class="n" style="color: #333;">imports</span><span class="p">)]</span></span>
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2899
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<pre style="margin: 0;">-<span id="LC2899" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;"><span class="idiff left right">where</span></span> <span class="c1" style="color: #998; font-style: italic;">-- The use of sort is just to reduce unnecessary</span></span>
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2907
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<pre style="margin: 0;">+<span id="LC2907" class="line" lang="haskell"> <span class="idiff left right"> </span> <span class="c1" style="color: #998; font-style: italic;">-- The use of sort is just to reduce unnecessary</span></span>
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2900
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2908
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<pre style="margin: 0;"> <span id="LC2908" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- wobbling in testsuite output</span></span>
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2901
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2909
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<pre style="margin: 0;"> <span id="LC2909" class="line" lang="haskell"></span>
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2902
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2910
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<pre style="margin: 0;"> <span id="LC2910" class="line" lang="haskell"><span class="n" style="color: #333;">ppr_rules</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LRuleDecl</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4bf18646acbb5a59ad8716aedc32acfe2ead0f58#83d23a46bb6cdc8b1edc16f1fd2c8f5c53e2c9ca"><strong>compiler/GHC/Tc/TyCl.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1791,6 +1791,272 @@ and take the wired-in information. That avoids complications.</td>
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1791
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<pre style="margin: 0;"> <span id="LC1791" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">e.g. the need to make the data constructor worker name for</span></span>
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1792
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1792
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<pre style="margin: 0;"> <span id="LC1792" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a constraint tuple match the wired-in one</span></span>
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1793
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<pre style="margin: 0;"> <span id="LC1793" class="line" lang="haskell"></span>
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1794
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<pre style="margin: 0;">+<span id="LC1794" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Datatype return kinds]</span></span>
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<pre style="margin: 0;">+<span id="LC1795" 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="LC1796" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">There are several poorly lit corners around datatype/newtype return kinds.</span></span>
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<pre style="margin: 0;">+<span id="LC1797" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This Note explains these. We cover data/newtype families and instances</span></span>
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<pre style="margin: 0;">+<span id="LC1798" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in Note [Data family/instance return kinds].</span></span>
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<pre style="margin: 0;">+<span id="LC1799" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1800" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">data T a :: <kind> where ... -- See Point DT4</span></span>
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<pre style="margin: 0;">+<span id="LC1801" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">newtype T a :: <kind> where ... -- See Point DT5</span></span>
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1802
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<pre style="margin: 0;">+<span id="LC1802" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1803" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">DT1 Where this applies: Only GADT syntax for data/newtype/instance declarations</span></span>
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1804
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<pre style="margin: 0;">+<span id="LC1804" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> can have declared return kinds. This Note does not apply to Haskell98</span></span>
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1805
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<pre style="margin: 0;">+<span id="LC1805" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> syntax.</span></span>
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<pre style="margin: 0;">+<span id="LC1806" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1807" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">DT2 Where these kinds come from: The return kind is part of the TyCon kind, gotten either</span></span>
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<pre style="margin: 0;">+<span id="LC1808" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> by checkInitialKind (standalone kind signature / CUSK) or</span></span>
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<pre style="margin: 0;">+<span id="LC1809" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> inferInitialKind. It is extracted by bindTyClTyVars in tcTyClDecl1. It is</span></span>
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<pre style="margin: 0;">+<span id="LC1810" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> then passed to tcDataDefn.</span></span>
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<pre style="margin: 0;">+<span id="LC1811" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1812" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">DT3 Eta-expansion: Any forall-bound variables and function arguments in a result kind</span></span>
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<pre style="margin: 0;">+<span id="LC1813" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> become parameters to the type. That is, when we say</span></span>
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<pre style="margin: 0;">+<span id="LC1814" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1815" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T a :: Type -> Type where ...</span></span>
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<pre style="margin: 0;">+<span id="LC1816" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1817" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> we really mean for T to have two parameters. The second parameter</span></span>
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<pre style="margin: 0;">+<span id="LC1818" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> is produced by processing the return kind in etaExpandAlgTyCon,</span></span>
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<pre style="margin: 0;">+<span id="LC1819" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> called in tcDataDefn.</span></span>
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<pre style="margin: 0;">+<span id="LC1820" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1821" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> See also Note [TyConBinders for the result kind signatures of a data type]</span></span>
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<pre style="margin: 0;">+<span id="LC1822" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in GHC.Tc.Gen.HsType.</span></span>
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1823
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<pre style="margin: 0;">+<span id="LC1823" class="line" lang="haskell"></span>
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1824
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<pre style="margin: 0;">+<span id="LC1824" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">DT4 Datatype return kind restriction: A data type return kind must end</span></span>
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1825
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<pre style="margin: 0;">+<span id="LC1825" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in a type that, after type-synonym expansion, yields `TYPE LiftedRep`. By</span></span>
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1826
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<pre style="margin: 0;">+<span id="LC1826" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> "end in", we mean we strip any foralls and function arguments off before</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1827" 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">
1827
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<pre style="margin: 0;">+<span id="LC1827" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> checking.</span></span>
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1828
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<pre style="margin: 0;">+<span id="LC1828" class="line" lang="haskell"></span>
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1829
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<pre style="margin: 0;">+<span id="LC1829" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Examples:</span></span>
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1830
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<pre style="margin: 0;">+<span id="LC1830" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T1 :: Type -- good</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1831" 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">
1831
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<pre style="margin: 0;">+<span id="LC1831" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T2 :: Bool -> Type -- good</span></span>
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1832
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<pre style="margin: 0;">+<span id="LC1832" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T3 :: Bool -> forall k. Type -- strange, but still accepted</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1833" 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">
1833
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<pre style="margin: 0;">+<span id="LC1833" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T4 :: forall k. k -> Type -- good</span></span>
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1834
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<pre style="margin: 0;">+<span id="LC1834" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T5 :: Bool -- bad</span></span>
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1835
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<pre style="margin: 0;">+<span id="LC1835" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T6 :: Type -> Bool -- bad</span></span>
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1836
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<pre style="margin: 0;">+<span id="LC1836" class="line" lang="haskell"></span>
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1837
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<pre style="margin: 0;">+<span id="LC1837" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Exactly the same applies to data instance (but not data family)</span></span>
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1838
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<pre style="margin: 0;">+<span id="LC1838" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> declarations. Examples</span></span>
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1839
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<pre style="margin: 0;">+<span id="LC1839" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data instance D1 :: Type -- good</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1840" 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">
1840
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<pre style="margin: 0;">+<span id="LC1840" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data instance D2 :: Bool -> Type -- good</span></span>
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1841
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<pre style="margin: 0;">+<span id="LC1841" class="line" lang="haskell"></span>
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1842
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<pre style="margin: 0;">+<span id="LC1842" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We can "look through" type synonyms</span></span>
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1843
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<pre style="margin: 0;">+<span id="LC1843" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type Star = Type</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1844" 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">
1844
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<pre style="margin: 0;">+<span id="LC1844" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T7 :: Bool -> Star -- good (synonym expansion ok)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1845" 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">
1845
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<pre style="margin: 0;">+<span id="LC1845" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type Arrow = (->)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1846" 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">
1846
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<pre style="margin: 0;">+<span id="LC1846" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T8 :: Arrow Bool Type -- good (ditto)</span></span>
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1847
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<pre style="margin: 0;">+<span id="LC1847" class="line" lang="haskell"></span>
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1848
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<pre style="margin: 0;">+<span id="LC1848" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> But we specifically do *not* do type family reduction here.</span></span>
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1849
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<pre style="margin: 0;">+<span id="LC1849" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type family ARROW where</span></span>
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1850
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<pre style="margin: 0;">+<span id="LC1850" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ARROW = (->)</span></span>
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1851
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<pre style="margin: 0;">+<span id="LC1851" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T9 :: ARROW Bool Type -- bad</span></span>
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1852
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<pre style="margin: 0;">+<span id="LC1852" class="line" lang="haskell"></span>
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1853
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<pre style="margin: 0;">+<span id="LC1853" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type family F a where</span></span>
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1854
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<pre style="margin: 0;">+<span id="LC1854" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> F Int = Bool</span></span>
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1855
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<pre style="margin: 0;">+<span id="LC1855" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> F Bool = Type</span></span>
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1856
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<pre style="margin: 0;">+<span id="LC1856" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T10 :: Bool -> F Bool -- bad</span></span>
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1857
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<pre style="margin: 0;">+<span id="LC1857" class="line" lang="haskell"></span>
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1858
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<pre style="margin: 0;">+<span id="LC1858" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The /principle/ here is that in the TyCon for a data type or data instance,</span></span>
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1859
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<pre style="margin: 0;">+<span id="LC1859" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> we must be able to lay out all the type-variable binders, one by one, until</span></span>
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1860
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<pre style="margin: 0;">+<span id="LC1860" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> we reach (TYPE xx). There is no place for a cast here. We could add one,</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1861" 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">
1861
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<pre style="margin: 0;">+<span id="LC1861" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> but let's not!</span></span>
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1862
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<pre style="margin: 0;">+<span id="LC1862" class="line" lang="haskell"></span>
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1863
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<pre style="margin: 0;">+<span id="LC1863" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> This check is done in checkDataKindSig. For data declarations, this</span></span>
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1864
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<pre style="margin: 0;">+<span id="LC1864" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> call is in tcDataDefn; for data instances, this call is in tcDataFamInstDecl.</span></span>
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1865
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<pre style="margin: 0;">+<span id="LC1865" class="line" lang="haskell"></span>
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1866
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<pre style="margin: 0;">+<span id="LC1866" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">DT5 Newtype return kind restriction.</span></span>
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1867
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<pre style="margin: 0;">+<span id="LC1867" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> If -XUnliftedNewtypes is not on, then newtypes are treated just</span></span>
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1868
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<pre style="margin: 0;">+<span id="LC1868" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> like datatypes --- see (4) above.</span></span>
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1869
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<pre style="margin: 0;">+<span id="LC1869" class="line" lang="haskell"></span>
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1870
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<pre style="margin: 0;">+<span id="LC1870" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> If -XUnliftedNewtypes is on, then a newtype return kind must end in</span></span>
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1871
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<pre style="margin: 0;">+<span id="LC1871" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> TYPE xyz, for some xyz (after type synonym expansion). The "xyz"</span></span>
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1872
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<pre style="margin: 0;">+<span id="LC1872" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> may include type families, but the TYPE part must be visible</span></span>
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1873
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<pre style="margin: 0;">+<span id="LC1873" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> /without/ expanding type families (only synonyms).</span></span>
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1874
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<pre style="margin: 0;">+<span id="LC1874" class="line" lang="haskell"></span>
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1875
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<pre style="margin: 0;">+<span id="LC1875" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> This kind is unified with the kind of the representation type (the</span></span>
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1876
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<pre style="margin: 0;">+<span id="LC1876" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type of the one argument to the one constructor). See also steps</span></span>
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1877
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<pre style="margin: 0;">+<span id="LC1877" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (2) and (3) of Note [Implementation of UnliftedNewtypes].</span></span>
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1878
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<pre style="margin: 0;">+<span id="LC1878" class="line" lang="haskell"></span>
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1879
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<pre style="margin: 0;">+<span id="LC1879" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The checks are done in the same places as for datatypes.</span></span>
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1880
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<pre style="margin: 0;">+<span id="LC1880" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Examples (assume -XUnliftedNewtypes):</span></span>
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1881
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<pre style="margin: 0;">+<span id="LC1881" class="line" lang="haskell"></span>
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1882
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<pre style="margin: 0;">+<span id="LC1882" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> newtype N1 :: Type -- good</span></span>
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1883
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<pre style="margin: 0;">+<span id="LC1883" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> newtype N2 :: Bool -> Type -- good</span></span>
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1884
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<pre style="margin: 0;">+<span id="LC1884" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> newtype N3 :: forall r. Bool -> TYPE r -- good</span></span>
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1885
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<pre style="margin: 0;">+<span id="LC1885" class="line" lang="haskell"></span>
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1886
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<pre style="margin: 0;">+<span id="LC1886" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type family F (t :: Type) :: RuntimeRep</span></span>
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1887
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<pre style="margin: 0;">+<span id="LC1887" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> newtype N4 :: forall t -> TYPE (F t) -- good</span></span>
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1888
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<pre style="margin: 0;">+<span id="LC1888" class="line" lang="haskell"></span>
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1889
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<pre style="margin: 0;">+<span id="LC1889" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type family STAR where</span></span>
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1890
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<pre style="margin: 0;">+<span id="LC1890" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> STAR = Type</span></span>
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1891
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<pre style="margin: 0;">+<span id="LC1891" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> newtype N5 :: Bool -> STAR -- bad</span></span>
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1892
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<pre style="margin: 0;">+<span id="LC1892" class="line" lang="haskell"></span>
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1893
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<pre style="margin: 0;">+<span id="LC1893" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Data family/instance return kinds]</span></span>
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1894
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<pre style="margin: 0;">+<span id="LC1894" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1895
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<pre style="margin: 0;">+<span id="LC1895" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Within this note, understand "instance" to mean data or newtype</span></span>
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1896
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<pre style="margin: 0;">+<span id="LC1896" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">instance, and understand "family" to mean data family. No type</span></span>
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1897
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<pre style="margin: 0;">+<span id="LC1897" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">families or classes here. Some examples:</span></span>
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1898
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<pre style="margin: 0;">+<span id="LC1898" class="line" lang="haskell"></span>
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1899
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<pre style="margin: 0;">+<span id="LC1899" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">data family T a :: <kind> -- See Point DF56</span></span>
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1900
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<pre style="margin: 0;">+<span id="LC1900" class="line" lang="haskell"></span>
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1901
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<pre style="margin: 0;">+<span id="LC1901" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">data instance T [a] :: <kind> where ... -- See Point DF2</span></span>
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1902
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<pre style="margin: 0;">+<span id="LC1902" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">newtype instance T [a] :: <kind> where ... -- See Point DF2</span></span>
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1903
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<pre style="margin: 0;">+<span id="LC1903" class="line" lang="haskell"></span>
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1904
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<pre style="margin: 0;">+<span id="LC1904" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here is the Plan for Data Families:</span></span>
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1905
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<pre style="margin: 0;">+<span id="LC1905" class="line" lang="haskell"></span>
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1906
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<pre style="margin: 0;">+<span id="LC1906" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">DF0 Where these kinds come from:</span></span>
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1907
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<pre style="margin: 0;">+<span id="LC1907" class="line" lang="haskell"></span>
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1908
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<pre style="margin: 0;">+<span id="LC1908" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Families: The return kind is either written in a standalone signature</span></span>
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1909
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<pre style="margin: 0;">+<span id="LC1909" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> or extracted from a family declaration in getInitialKind.</span></span>
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1910
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<pre style="margin: 0;">+<span id="LC1910" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> If a family declaration is missing a result kind, it is assumed to be</span></span>
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1911
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<pre style="margin: 0;">+<span id="LC1911" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Type. This assumption is in getInitialKind for CUSKs or</span></span>
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1912
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<pre style="margin: 0;">+<span id="LC1912" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> get_fam_decl_initial_kind for non-signature & non-CUSK cases.</span></span>
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1913
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<pre style="margin: 0;">+<span id="LC1913" class="line" lang="haskell"></span>
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1914
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<pre style="margin: 0;">+<span id="LC1914" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Instances: The data family already has a known kind. The return kind</span></span>
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1915
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<pre style="margin: 0;">+<span id="LC1915" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> of an instance is then calculated by applying the data family tycon</span></span>
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1916
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<pre style="margin: 0;">+<span id="LC1916" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> to the patterns provided, as computed by the typeKind lhs_ty in the</span></span>
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1917
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<pre style="margin: 0;">+<span id="LC1917" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> end of tcDataFamInstHeader. In the case of an instance written in GADT</span></span>
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1918
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<pre style="margin: 0;">+<span id="LC1918" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> syntax, there are potentially *two* return kinds: the one computed from</span></span>
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1919
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<pre style="margin: 0;">+<span id="LC1919" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> applying the data family tycon to the patterns, and the one given by</span></span>
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1920
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<pre style="margin: 0;">+<span id="LC1920" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the user. This second kind is checked by the tc_kind_sig function within</span></span>
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1921
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<pre style="margin: 0;">+<span id="LC1921" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> tcDataFamInstHeader. See also DF3, below.</span></span>
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1922
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<pre style="margin: 0;">+<span id="LC1922" class="line" lang="haskell"></span>
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1923
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<pre style="margin: 0;">+<span id="LC1923" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">DF1 In a data/newtype instance, we treat the kind of the /data family/,</span></span>
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1924
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<pre style="margin: 0;">+<span id="LC1924" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> once instantiated, as the "master kind" for the representation</span></span>
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1925
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<pre style="margin: 0;">+<span id="LC1925" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> TyCon. For example:</span></span>
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1926
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<pre style="margin: 0;">+<span id="LC1926" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data family T1 :: Type -> Type -> Type</span></span>
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1927
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<pre style="margin: 0;">+<span id="LC1927" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data instance T1 Int :: F Bool -> Type where ...</span></span>
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1928
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<pre style="margin: 0;">+<span id="LC1928" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The "master kind" for the representation TyCon R:T1Int comes</span></span>
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1929
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<pre style="margin: 0;">+<span id="LC1929" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> from T1, not from the signature on the data instance. It is as</span></span>
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1930
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<pre style="margin: 0;">+<span id="LC1930" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> if we declared</span></span>
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1931
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<pre style="margin: 0;">+<span id="LC1931" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data R:T1Int :: Type -> Type where ...</span></span>
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1932
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<pre style="margin: 0;">+<span id="LC1932" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> See Note [Liberalising data family return kinds] for an alternative</span></span>
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1933
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<pre style="margin: 0;">+<span id="LC1933" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> plan. But this current plan is simple, and ensures that all instances</span></span>
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1934
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<pre style="margin: 0;">+<span id="LC1934" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> are simple instantiations of the master, without strange casts.</span></span>
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1935
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<pre style="margin: 0;">+<span id="LC1935" class="line" lang="haskell"></span>
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1936
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<pre style="margin: 0;">+<span id="LC1936" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> An example with non-trivial instantiation:</span></span>
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1937
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<pre style="margin: 0;">+<span id="LC1937" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data family T2 :: forall k. Type -> k</span></span>
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1938
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<pre style="margin: 0;">+<span id="LC1938" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data instance T2 :: Type -> Type -> Type where ...</span></span>
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1939
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<pre style="margin: 0;">+<span id="LC1939" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Here 'k' gets instantiated with (Type -> Type), driven by</span></span>
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1940
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<pre style="margin: 0;">+<span id="LC1940" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the signature on the 'data instance'. (See also DT3 of</span></span>
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1941
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<pre style="margin: 0;">+<span id="LC1941" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Note [Datatype return kinds] about eta-expansion, which applies here,</span></span>
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1942
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<pre style="margin: 0;">+<span id="LC1942" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> too; see tcDataFamInstDecl's call of etaExpandAlgTyCon.)</span></span>
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1943
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<pre style="margin: 0;">+<span id="LC1943" class="line" lang="haskell"></span>
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1944
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<pre style="margin: 0;">+<span id="LC1944" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> A newtype example:</span></span>
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1945
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<pre style="margin: 0;">+<span id="LC1945" class="line" lang="haskell"></span>
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1946
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<pre style="margin: 0;">+<span id="LC1946" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data Color = Red | Blue</span></span>
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1947
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<pre style="margin: 0;">+<span id="LC1947" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type family Interpret (x :: Color) :: RuntimeRep where</span></span>
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1948
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<pre style="margin: 0;">+<span id="LC1948" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Interpret 'Red = 'IntRep</span></span>
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1949
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<pre style="margin: 0;">+<span id="LC1949" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Interpret 'Blue = 'WordRep</span></span>
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1950
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<pre style="margin: 0;">+<span id="LC1950" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data family Foo (x :: Color) :: TYPE (Interpret x)</span></span>
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1951
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<pre style="margin: 0;">+<span id="LC1951" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> newtype instance Foo 'Red :: TYPE IntRep where</span></span>
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1952
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<pre style="margin: 0;">+<span id="LC1952" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> FooRedC :: Int# -> Foo 'Red</span></span>
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1953
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<pre style="margin: 0;">+<span id="LC1953" class="line" lang="haskell"></span>
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1954
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<pre style="margin: 0;">+<span id="LC1954" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Here we get that Foo 'Red :: TYPE (Interpret Red), and our</span></span>
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1955
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<pre style="margin: 0;">+<span id="LC1955" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> representation newtype looks like</span></span>
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1956
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<pre style="margin: 0;">+<span id="LC1956" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> newtype R:FooRed :: TYPE (Interpret Red) where</span></span>
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1957
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<pre style="margin: 0;">+<span id="LC1957" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> FooRedC :: Int# -> R:FooRed</span></span>
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1958
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<pre style="margin: 0;">+<span id="LC1958" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Remember: the master kind comes from the /family/ tycon.</span></span>
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1959
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<pre style="margin: 0;">+<span id="LC1959" class="line" lang="haskell"></span>
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1960
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<pre style="margin: 0;">+<span id="LC1960" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">DF2 /After/ this instantiation, the return kind of the master kind</span></span>
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1961
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<pre style="margin: 0;">+<span id="LC1961" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> must obey the usual rules for data/newtype return kinds (DT4, DT5)</span></span>
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1962
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<pre style="margin: 0;">+<span id="LC1962" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> of Note [Datatype return kinds]. Examples:</span></span>
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1963
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<pre style="margin: 0;">+<span id="LC1963" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data family T3 k :: k</span></span>
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1964
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<pre style="margin: 0;">+<span id="LC1964" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data instance T3 Type where ... -- OK</span></span>
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1965
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<pre style="margin: 0;">+<span id="LC1965" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data instance T3 (Type->Type) where ... -- OK</span></span>
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1966
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<pre style="margin: 0;">+<span id="LC1966" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data instance T3 (F Int) where ... -- Not OK</span></span>
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1967
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<pre style="margin: 0;">+<span id="LC1967" class="line" lang="haskell"></span>
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<td class="diff-line-num new new_line" data-linenumber="1968" 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">
1968
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<pre style="margin: 0;">+<span id="LC1968" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">DF3 Any kind signatures on the data/newtype instance are checked for</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1969" 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">
1969
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<pre style="margin: 0;">+<span id="LC1969" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> equality with the master kind (and hence may guide instantiation)</span></span>
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1970
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<pre style="margin: 0;">+<span id="LC1970" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> but are otherwise ignored. So in the T1 example above, we check</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1971" 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">
1971
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<pre style="margin: 0;">+<span id="LC1971" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> that (F Int ~ Type) by unification; but otherwise ignore the</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1972" 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">
1972
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<pre style="margin: 0;">+<span id="LC1972" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> user-supplied signature from the /family/ not the /instance/.</span></span>
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1973
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<pre style="margin: 0;">+<span id="LC1973" class="line" lang="haskell"></span>
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<td class="diff-line-num new new_line" data-linenumber="1974" 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">
1974
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<pre style="margin: 0;">+<span id="LC1974" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We must be sure to instantiate any trailing invisible binders</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1975" 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">
1975
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<pre style="margin: 0;">+<span id="LC1975" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> before doing this unification. See the call to tcInstInvisibleBinders</span></span>
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1976
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<pre style="margin: 0;">+<span id="LC1976" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in tcDataFamInstHeader. For example:</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1977" 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">
1977
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<pre style="margin: 0;">+<span id="LC1977" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data family D :: forall k. k</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1978" 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">
1978
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<pre style="margin: 0;">+<span id="LC1978" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data instance D :: Type -- forall k. k <: Type</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1979" 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">
1979
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<pre style="margin: 0;">+<span id="LC1979" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data instance D :: Type -> Type -- forall k. k <: Type -> Type</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1980" 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">
1980
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<pre style="margin: 0;">+<span id="LC1980" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- NB: these do not overlap</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1981" 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">
1981
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<pre style="margin: 0;">+<span id="LC1981" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> we must instantiate D before unifying with the signature in the</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1982" 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">
1982
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<pre style="margin: 0;">+<span id="LC1982" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data instance declaration</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1983" 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">
1983
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<pre style="margin: 0;">+<span id="LC1983" class="line" lang="haskell"></span>
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<td class="diff-line-num new new_line" data-linenumber="1984" 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">
1984
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<pre style="margin: 0;">+<span id="LC1984" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">DF4 We also (redundantly) check that any user-specified return kind</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1985" 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">
1985
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<pre style="margin: 0;">+<span id="LC1985" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> signature in the data instance also obeys DT4/DT5. For example we</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1986" 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">
1986
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<pre style="margin: 0;">+<span id="LC1986" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> reject</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1987" 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">
1987
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<pre style="margin: 0;">+<span id="LC1987" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data family T1 :: Type -> Type -> Type</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1988" 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">
1988
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<pre style="margin: 0;">+<span id="LC1988" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data instance T1 Int :: Type -> F Int</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1989" 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">
1989
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<pre style="margin: 0;">+<span id="LC1989" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> even if (F Int ~ Type). We could omit this check, because we</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1990" 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">
1990
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<pre style="margin: 0;">+<span id="LC1990" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> use the master kind; but it seems more uniform to check it, again</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1991" 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">
1991
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<pre style="margin: 0;">+<span id="LC1991" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> with checkDataKindSig.</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1992" 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">
1992
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<pre style="margin: 0;">+<span id="LC1992" class="line" lang="haskell"></span>
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<td class="diff-line-num new new_line" data-linenumber="1993" 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">
1993
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<pre style="margin: 0;">+<span id="LC1993" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">DF5 Data /family/ return kind restrictions. Consider</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1994" 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">
1994
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<pre style="margin: 0;">+<span id="LC1994" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data family D8 a :: F a</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1995" 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">
1995
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<pre style="margin: 0;">+<span id="LC1995" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> where F is a type family. No data/newtype instance can instantiate</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1996" 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">
1996
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<pre style="margin: 0;">+<span id="LC1996" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> this so that it obeys the rules of DT4 or DT5. So GHC proactively</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1997" 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">
1997
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<pre style="margin: 0;">+<span id="LC1997" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> rejects the data /family/ declaration if it can never satisfy (DT4)/(DT5).</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1998" 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">
1998
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<pre style="margin: 0;">+<span id="LC1998" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Remember that a data family supports both data and newtype instances.</span></span>
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1999
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<pre style="margin: 0;">+<span id="LC1999" class="line" lang="haskell"></span>
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2000
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<pre style="margin: 0;">+<span id="LC2000" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> More precisely, the return kind of a data family must be either</span></span>
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2001
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<pre style="margin: 0;">+<span id="LC2001" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * TYPE xyz (for some type xyz) or</span></span>
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2002
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<pre style="margin: 0;">+<span id="LC2002" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * a kind variable</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2003" 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">
2003
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<pre style="margin: 0;">+<span id="LC2003" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Only in these cases can a data/newtype instance possibly satisfy (DT4)/(DT5).</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2004" 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">
2004
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<pre style="margin: 0;">+<span id="LC2004" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> This is checked by the call to checkDataKindSig in tcFamDecl1. Examples:</span></span>
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2005
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<pre style="margin: 0;">+<span id="LC2005" class="line" lang="haskell"></span>
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<td class="diff-line-num new new_line" data-linenumber="2006" 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">
2006
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<pre style="margin: 0;">+<span id="LC2006" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data family D1 :: Type -- good</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2007" 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">
2007
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<pre style="margin: 0;">+<span id="LC2007" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data family D2 :: Bool -> Type -- good</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2008" 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">
2008
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<pre style="margin: 0;">+<span id="LC2008" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data family D3 k :: k -- good</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2009" 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">
2009
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<pre style="margin: 0;">+<span id="LC2009" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data family D4 :: forall k -> k -- good</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2010" 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">
2010
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<pre style="margin: 0;">+<span id="LC2010" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data family D5 :: forall k. k -> k -- good</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2011" 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">
2011
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<pre style="margin: 0;">+<span id="LC2011" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data family D6 :: forall r. TYPE r -- good</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2012" 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">
2012
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<pre style="margin: 0;">+<span id="LC2012" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data family D7 :: Bool -> STAR -- bad (see STAR from point 5)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2013" 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">
2013
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<pre style="margin: 0;">+<span id="LC2013" class="line" lang="haskell"></span>
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<td class="diff-line-num new new_line" data-linenumber="2014" 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">
2014
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<pre style="margin: 0;">+<span id="LC2014" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">DF6 Two return kinds for instances: If an instance has two return kinds,</span></span>
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2015
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<pre style="margin: 0;">+<span id="LC2015" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> one from the family declaration and one from the instance declaration</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2016" 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">
2016
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<pre style="margin: 0;">+<span id="LC2016" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (see point DF3 above), they are unified. More accurately, we make sure</span></span>
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2017
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<pre style="margin: 0;">+<span id="LC2017" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> that the kind of the applied data family is a subkind of the user-written</span></span>
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2018
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<pre style="margin: 0;">+<span id="LC2018" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> kind. GHC.Tc.Gen.HsType.checkExpectedKind normally does this check for types, but</span></span>
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2019
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<pre style="margin: 0;">+<span id="LC2019" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> that's overkill for our needs here. Instead, we just instantiate any</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2020" 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">
2020
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<pre style="margin: 0;">+<span id="LC2020" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> invisible binders in the (instantiated) kind of the data family</span></span>
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2021
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<pre style="margin: 0;">+<span id="LC2021" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (called lhs_kind in tcDataFamInstHeader) with tcInstInvisibleTyBinders</span></span>
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2022
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<pre style="margin: 0;">+<span id="LC2022" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> and then unify the resulting kind with the kind written by the user.</span></span>
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2023
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<pre style="margin: 0;">+<span id="LC2023" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> This unification naturally produces a coercion, which we can drop, as</span></span>
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2024
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<pre style="margin: 0;">+<span id="LC2024" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the kind annotation on the instance is redundant (except perhaps for</span></span>
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2025
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<pre style="margin: 0;">+<span id="LC2025" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> effects of unification).</span></span>
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2026
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<pre style="margin: 0;">+<span id="LC2026" class="line" lang="haskell"></span>
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2027
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<pre style="margin: 0;">+<span id="LC2027" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> This all is Wrinkle (3) in Note [Implementation of UnliftedNewtypes].</span></span>
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2028
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<pre style="margin: 0;">+<span id="LC2028" class="line" lang="haskell"></span>
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2029
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<pre style="margin: 0;">+<span id="LC2029" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Liberalising data family return kinds]</span></span>
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2030
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<pre style="margin: 0;">+<span id="LC2030" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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2031
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<pre style="margin: 0;">+<span id="LC2031" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Could we allow this?</span></span>
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2032
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<pre style="margin: 0;">+<span id="LC2032" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type family F a where { F Int = Type }</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2033" 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">
2033
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<pre style="margin: 0;">+<span id="LC2033" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data family T a :: F a</span></span>
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2034
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<pre style="margin: 0;">+<span id="LC2034" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data instance T Int where</span></span>
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2035
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<pre style="margin: 0;">+<span id="LC2035" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkT :: T Int</span></span>
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2036
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<pre style="margin: 0;">+<span id="LC2036" class="line" lang="haskell"></span>
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2037
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<pre style="margin: 0;">+<span id="LC2037" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In the 'data instance', T Int :: F Int, and F Int = Type, so all seems</span></span>
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2038
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<pre style="margin: 0;">+<span id="LC2038" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">well. But there are lots of complications:</span></span>
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2039
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<pre style="margin: 0;">+<span id="LC2039" class="line" lang="haskell"></span>
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2040
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<pre style="margin: 0;">+<span id="LC2040" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* The representation constructor R:TInt presumably has kind Type.</span></span>
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2041
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<pre style="margin: 0;">+<span id="LC2041" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> So the axiom connecting the two would have to look like</span></span>
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2042
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<pre style="margin: 0;">+<span id="LC2042" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> axTInt :: T Int ~ R:TInt |> sym axFInt</span></span>
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2043
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<pre style="margin: 0;">+<span id="LC2043" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> and that doesn't match expectation in DataFamInstTyCon</span></span>
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2044
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<pre style="margin: 0;">+<span id="LC2044" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in AlgTyConFlav</span></span>
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2045
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<pre style="margin: 0;">+<span id="LC2045" class="line" lang="haskell"></span>
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2046
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<pre style="margin: 0;">+<span id="LC2046" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* The wrapper can't have type</span></span>
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2047
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<pre style="margin: 0;">+<span id="LC2047" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> $WMkT :: Int -> T Int</span></span>
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2048
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<pre style="margin: 0;">+<span id="LC2048" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> because T Int has the wrong kind. It would have to be</span></span>
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2049
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<pre style="margin: 0;">+<span id="LC2049" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> $WMkT :: Int -> (T Int) |> axFInt</span></span>
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2050
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<pre style="margin: 0;">+<span id="LC2050" class="line" lang="haskell"></span>
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2051
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<pre style="margin: 0;">+<span id="LC2051" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* The code for $WMkT would also be more complicated, needing</span></span>
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2052
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<pre style="margin: 0;">+<span id="LC2052" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> two coherence coercions. Try it!</span></span>
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2053
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<pre style="margin: 0;">+<span id="LC2053" class="line" lang="haskell"></span>
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2054
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<pre style="margin: 0;">+<span id="LC2054" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Code for pattern matching would be complicated in an</span></span>
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2055
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<pre style="margin: 0;">+<span id="LC2055" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> exactly dual way.</span></span>
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2056
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<pre style="margin: 0;">+<span id="LC2056" class="line" lang="haskell"></span>
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2057
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<pre style="margin: 0;">+<span id="LC2057" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So yes, we could allow this, but we currently do not. That's</span></span>
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2058
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<pre style="margin: 0;">+<span id="LC2058" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">why we have DF2 in Note [Data family/instance return kinds].</span></span>
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2059
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<pre style="margin: 0;">+<span id="LC2059" class="line" lang="haskell"></span>
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1794
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2060
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<pre style="margin: 0;"> <span id="LC2060" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Implementation of UnliftedNewtypes]</span></span>
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1795
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2061
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<pre style="margin: 0;"> <span id="LC2061" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1796
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2062
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<pre style="margin: 0;"> <span id="LC2062" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Expected behavior of UnliftedNewtypes:</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">@@ -1867,11 +2133,12 @@ Wrinkle: Consider (#17021, typecheck/should_fail/T17021)</td>
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1867
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<pre style="margin: 0;"> <span id="LC2133" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> newtype T :: TYPE (Id LiftedRep) where</span></span>
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2134
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<pre style="margin: 0;"> <span id="LC2134" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkT :: Int -> T</span></span>
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2135
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<pre style="margin: 0;"> <span id="LC2135" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1870" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> In the type of MkT, we must end with (Int |> TYPE (sym axId)) -> T, never Int -> (T |></span></span>
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1871
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<pre style="margin: 0;">-<span id="LC1871" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> TYPE axId); otherwise, the result type of the constructor wouldn't match the</span></span>
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1872
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<pre style="margin: 0;">-<span id="LC1872" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> datatype. However, type-checking the HsType T might reasonably result in</span></span>
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1873
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<pre style="margin: 0;">-<span id="LC1873" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (T |> hole). We thus must ensure that this cast is dropped, forcing the</span></span>
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<pre style="margin: 0;">-<span id="LC1874" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type-checker to add one to the Int instead.</span></span>
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2136
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<pre style="margin: 0;">+<span id="LC2136" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> In the type of MkT, we must end with (Int |> TYPE (sym axId)) -> T,</span></span>
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2137
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<pre style="margin: 0;">+<span id="LC2137" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> never Int -> (T |> TYPE axId); otherwise, the result type of the</span></span>
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2138
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<pre style="margin: 0;">+<span id="LC2138" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> constructor wouldn't match the datatype. However, type-checking the</span></span>
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<pre style="margin: 0;">+<span id="LC2139" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> HsType T might reasonably result in (T |> hole). We thus must ensure</span></span>
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2140
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<pre style="margin: 0;">+<span id="LC2140" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> that this cast is dropped, forcing the type-checker to add one to</span></span>
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2141
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<pre style="margin: 0;">+<span id="LC2141" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the Int instead.</span></span>
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2142
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<pre style="margin: 0;"> <span id="LC2142" class="line" lang="haskell"></span>
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2143
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<pre style="margin: 0;"> <span id="LC2143" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Why is it always safe to drop the cast? This result type is type-checked by</span></span>
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1877
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2144
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<pre style="margin: 0;"> <span id="LC2144" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> tcHsOpenType, so its kind definitely looks like TYPE r, for some r. It is</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1883,7 +2150,7 @@ Wrinkle: Consider (#17021, typecheck/should_fail/T17021)</td>
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2150
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<pre style="margin: 0;"> <span id="LC2150" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that this is possible in the H98 case only for a data family, because</span></span>
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1884
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2151
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<pre style="margin: 0;"> <span id="LC2151" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the H98 syntax doesn't permit a kind signature on the newtype itself.</span></span>
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2152
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<pre style="margin: 0;"> <span id="LC2152" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1886" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">There are also some changes for dea<span class="idiff left right">il</span>ng with families:</span></span>
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2153
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<pre style="margin: 0;">+<span id="LC2153" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">There are also some changes for dea<span class="idiff left right">li</span>ng with families:</span></span>
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2154
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<pre style="margin: 0;"> <span id="LC2154" class="line" lang="haskell"></span>
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2155
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<pre style="margin: 0;"> <span id="LC2155" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1. In tcFamDecl1, we suppress a tcIsLiftedTypeKind check if</span></span>
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2156
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<pre style="margin: 0;"> <span id="LC2156" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> UnliftedNewtypes is on. This allows us to write things like:</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">@@ -1905,7 +2172,7 @@ There are also some changes for deailng with families:</td>
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1905
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2172
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<pre style="margin: 0;"> <span id="LC2172" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> we use that kind signature.</span></span>
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1906
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2173
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<pre style="margin: 0;"> <span id="LC2173" class="line" lang="haskell"></span>
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1907
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2174
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<pre style="margin: 0;"> <span id="LC2174" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">3. A data family and its newtype instance may be declared with slightly</span></span>
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1908
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<pre style="margin: 0;">-<span id="LC1908" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> different kinds. See point <span class="idiff left right">7 in Note [Datatype return kinds].</span></span></span>
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2175
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<pre style="margin: 0;">+<span id="LC2175" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> different kinds. See point <span class="idiff left right">DF6 in Note [Data family/instance return kinds]</span></span></span>
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1909
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2176
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<pre style="margin: 0;"> <span id="LC2176" class="line" lang="haskell"></span>
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1910
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2177
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<pre style="margin: 0;"> <span id="LC2177" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">There's also a change in the renamer:</span></span>
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1911
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2178
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<pre style="margin: 0;"> <span id="LC2178" 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">@@ -2292,187 +2559,6 @@ Since the LHS of an associated type family default is always just variables,</td>
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2292
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2559
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<pre style="margin: 0;"> <span id="LC2559" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">it won't contain any tycons. Accordingly, the patterns used in the substitution</span></span>
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2293
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2560
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<pre style="margin: 0;"> <span id="LC2560" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">won't actually be knot-tied, even though we're in the knot. This is too</span></span>
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2294
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2561
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<pre style="margin: 0;"> <span id="LC2561" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">delicate for my taste, but it works.</span></span>
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2295
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<pre style="margin: 0;">-<span id="LC2295" class="line" lang="haskell"></span>
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2296
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<pre style="margin: 0;">-<span id="LC2296" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Datatype return kinds]</span></span>
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2297
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<pre style="margin: 0;">-<span id="LC2297" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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2298
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<pre style="margin: 0;">-<span id="LC2298" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">There are several poorly lit corners around datatype/newtype return kinds.</span></span>
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2299
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<pre style="margin: 0;">-<span id="LC2299" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This Note explains these. Within this note, always understand "instance"</span></span>
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2300
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<pre style="margin: 0;">-<span id="LC2300" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to mean data or newtype instance, and understand "family" to mean data</span></span>
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2301
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<pre style="margin: 0;">-<span id="LC2301" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">family. No type families or classes here. Some examples:</span></span>
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2302
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<pre style="margin: 0;">-<span id="LC2302" class="line" lang="haskell"></span>
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2303
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<pre style="margin: 0;">-<span id="LC2303" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">data T a :: <kind> where ... -- See Point 4</span></span>
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2304
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<pre style="margin: 0;">-<span id="LC2304" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">newtype T a :: <kind> where ... -- See Point 5</span></span>
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2305
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<pre style="margin: 0;">-<span id="LC2305" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2306" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">data family T a :: <kind> -- See Point 6</span></span>
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2307
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<pre style="margin: 0;">-<span id="LC2307" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2308" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">data instance T [a] :: <kind> where ... -- See Point 4</span></span>
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2309
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<pre style="margin: 0;">-<span id="LC2309" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">newtype instance T [a] :: <kind> where ... -- See Point 5</span></span>
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2310
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<pre style="margin: 0;">-<span id="LC2310" class="line" lang="haskell"></span>
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2311
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<pre style="margin: 0;">-<span id="LC2311" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1. Where this applies: Only GADT syntax for data/newtype/instance declarations</span></span>
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2312
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<pre style="margin: 0;">-<span id="LC2312" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> can have declared return kinds. This Note does not apply to Haskell98</span></span>
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2313
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<pre style="margin: 0;">-<span id="LC2313" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> syntax.</span></span>
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2314
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<pre style="margin: 0;">-<span id="LC2314" class="line" lang="haskell"></span>
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2315
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<pre style="margin: 0;">-<span id="LC2315" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">2. Where these kinds come from: Return kinds are processed through several</span></span>
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2316
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<pre style="margin: 0;">-<span id="LC2316" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> different code paths:</span></span>
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2317
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<pre style="margin: 0;">-<span id="LC2317" class="line" lang="haskell"></span>
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2318
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<pre style="margin: 0;">-<span id="LC2318" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Data/newtypes: The return kind is part of the TyCon kind, gotten either</span></span>
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2319
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<pre style="margin: 0;">-<span id="LC2319" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> by checkInitialKind (standalone kind signature / CUSK) or</span></span>
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2320
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<pre style="margin: 0;">-<span id="LC2320" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> inferInitialKind. It is extracted by bindTyClTyVars in tcTyClDecl1. It is</span></span>
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2321
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<pre style="margin: 0;">-<span id="LC2321" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> then passed to tcDataDefn.</span></span>
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2322
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<pre style="margin: 0;">-<span id="LC2322" class="line" lang="haskell"></span>
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2323
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<pre style="margin: 0;">-<span id="LC2323" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Families: The return kind is either written in a standalone signature</span></span>
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2324
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<pre style="margin: 0;">-<span id="LC2324" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> or extracted from a family declaration in getInitialKind.</span></span>
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2325
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<pre style="margin: 0;">-<span id="LC2325" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> If a family declaration is missing a result kind, it is assumed to be</span></span>
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2326
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<pre style="margin: 0;">-<span id="LC2326" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Type. This assumption is in getInitialKind for CUSKs or</span></span>
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2327
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<pre style="margin: 0;">-<span id="LC2327" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> get_fam_decl_initial_kind for non-signature & non-CUSK cases.</span></span>
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2328
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<pre style="margin: 0;">-<span id="LC2328" class="line" lang="haskell"></span>
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2329
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<pre style="margin: 0;">-<span id="LC2329" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Instances: The data family already has a known kind. The return kind</span></span>
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2330
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<pre style="margin: 0;">-<span id="LC2330" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> of an instance is then calculated by applying the data family tycon</span></span>
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<pre style="margin: 0;">-<span id="LC2331" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> to the patterns provided, as computed by the typeKind lhs_ty in the</span></span>
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<pre style="margin: 0;">-<span id="LC2332" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> end of tcDataFamInstHeader. In the case of an instance written in GADT</span></span>
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<pre style="margin: 0;">-<span id="LC2333" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> syntax, there are potentially *two* return kinds: the one computed from</span></span>
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<pre style="margin: 0;">-<span id="LC2334" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> applying the data family tycon to the patterns, and the one given by</span></span>
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2335
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<pre style="margin: 0;">-<span id="LC2335" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the user. This second kind is checked by the tc_kind_sig function within</span></span>
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2336
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<pre style="margin: 0;">-<span id="LC2336" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> tcDataFamInstHeader.</span></span>
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2337
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<pre style="margin: 0;">-<span id="LC2337" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2338" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">3. Eta-expansion: Any forall-bound variables and function arguments in a result kind</span></span>
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2339
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<pre style="margin: 0;">-<span id="LC2339" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> become parameters to the type. That is, when we say</span></span>
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2340
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<pre style="margin: 0;">-<span id="LC2340" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2341" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T a :: Type -> Type where ...</span></span>
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<pre style="margin: 0;">-<span id="LC2342" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2343" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> we really mean for T to have two parameters. The second parameter</span></span>
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<pre style="margin: 0;">-<span id="LC2344" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> is produced by processing the return kind in etaExpandAlgTyCon,</span></span>
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<pre style="margin: 0;">-<span id="LC2345" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> called in tcDataDefn for data/newtypes and in tcDataFamInstDecl</span></span>
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2346
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<pre style="margin: 0;">-<span id="LC2346" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> for instances. This is true for data families as well, though their</span></span>
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2347
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<pre style="margin: 0;">-<span id="LC2347" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> arity only matters for pretty-printing.</span></span>
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2348
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<pre style="margin: 0;">-<span id="LC2348" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2349" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> See also Note [TyConBinders for the result kind signatures of a data type]</span></span>
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2350
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<pre style="margin: 0;">-<span id="LC2350" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in GHC.Tc.Gen.HsType.</span></span>
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2351
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<pre style="margin: 0;">-<span id="LC2351" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2352" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">4. Datatype return kind restriction: A data/data-instance return kind must end</span></span>
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<pre style="margin: 0;">-<span id="LC2353" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in a type that, after type-synonym expansion, yields `TYPE LiftedRep`. By</span></span>
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<pre style="margin: 0;">-<span id="LC2354" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> "end in", we mean we strip any foralls and function arguments off before</span></span>
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2355
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<pre style="margin: 0;">-<span id="LC2355" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> checking: this remaining part of the type is returned from etaExpandAlgTyCon.</span></span>
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2356
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<pre style="margin: 0;">-<span id="LC2356" class="line" lang="haskell"></span>
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2357
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<pre style="margin: 0;">-<span id="LC2357" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Examples:</span></span>
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2358
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<td class="diff-line-num new_line old" data-linenumber="2562" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC2358" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T1 :: Type -- good</span></span>
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2359
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<td class="diff-line-num new_line old" data-linenumber="2562" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC2359" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T2 :: Bool -> Type -- good</span></span>
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2360
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<td class="diff-line-num new_line old" data-linenumber="2562" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC2360" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T3 :: Bool -> forall k. Type -- strange, but still accepted</span></span>
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2361
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<td class="diff-line-num new_line old" data-linenumber="2562" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC2361" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T4 :: forall k. k -> Type -- good</span></span>
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2362
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<pre style="margin: 0;">-<span id="LC2362" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T5 :: Bool -- bad</span></span>
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2363
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<pre style="margin: 0;">-<span id="LC2363" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T6 :: Type -> Bool -- bad</span></span>
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2364
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<pre style="margin: 0;">-<span id="LC2364" class="line" lang="haskell"></span>
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2365
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<pre style="margin: 0;">-<span id="LC2365" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Exactly the same applies to data instance (but not data family)</span></span>
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2366
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<pre style="margin: 0;">-<span id="LC2366" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> declarations. Examples</span></span>
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2367
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<pre style="margin: 0;">-<span id="LC2367" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data instance D1 :: Type -- good</span></span>
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2368
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<pre style="margin: 0;">-<span id="LC2368" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data instance D2 :: Boool -> Type -- good</span></span>
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2369
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<pre style="margin: 0;">-<span id="LC2369" class="line" lang="haskell"></span>
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2370
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<pre style="margin: 0;">-<span id="LC2370" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We can "look through" type synonyms</span></span>
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2371
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<pre style="margin: 0;">-<span id="LC2371" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type Star = Type</span></span>
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2372
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<pre style="margin: 0;">-<span id="LC2372" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T7 :: Bool -> Star -- good (synonym expansion ok)</span></span>
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2373
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<pre style="margin: 0;">-<span id="LC2373" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type Arrow = (->)</span></span>
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2374
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<pre style="margin: 0;">-<span id="LC2374" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T8 :: Arrow Bool Type -- good (ditto)</span></span>
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2375
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<pre style="margin: 0;">-<span id="LC2375" class="line" lang="haskell"></span>
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2376
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<pre style="margin: 0;">-<span id="LC2376" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> But we specifically do *not* do type family reduction here.</span></span>
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2377
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<pre style="margin: 0;">-<span id="LC2377" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type family ARROW where</span></span>
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2378
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<pre style="margin: 0;">-<span id="LC2378" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ARROW = (->)</span></span>
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2379
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<pre style="margin: 0;">-<span id="LC2379" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T9 :: ARROW Bool Type -- bad</span></span>
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2380
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<pre style="margin: 0;">-<span id="LC2380" class="line" lang="haskell"></span>
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2381
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<pre style="margin: 0;">-<span id="LC2381" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type family F a where</span></span>
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2382
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<pre style="margin: 0;">-<span id="LC2382" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> F Int = Bool</span></span>
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2383
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<pre style="margin: 0;">-<span id="LC2383" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> F Bool = Type</span></span>
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2384
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<pre style="margin: 0;">-<span id="LC2384" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T10 :: Bool -> F Bool -- bad</span></span>
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2385
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<pre style="margin: 0;">-<span id="LC2385" class="line" lang="haskell"></span>
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2386
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<pre style="margin: 0;">-<span id="LC2386" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The /principle/ here is that in the TyCon for a data type or data instance,</span></span>
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2387
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<pre style="margin: 0;">-<span id="LC2387" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> we must be able to lay out all the type-variable binders, one by one, until</span></span>
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2388
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<pre style="margin: 0;">-<span id="LC2388" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> we reach (TYPE xx). There is no place for a cast here. We could add one,</span></span>
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2389
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<pre style="margin: 0;">-<span id="LC2389" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> but let's not!</span></span>
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2390
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<pre style="margin: 0;">-<span id="LC2390" class="line" lang="haskell"></span>
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2391
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<pre style="margin: 0;">-<span id="LC2391" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> This check is done in checkDataKindSig. For data declarations, this</span></span>
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2392
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<pre style="margin: 0;">-<span id="LC2392" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> call is in tcDataDefn; for data instances, this call is in tcDataFamInstDecl.</span></span>
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2393
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<pre style="margin: 0;">-<span id="LC2393" class="line" lang="haskell"></span>
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2394
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<pre style="margin: 0;">-<span id="LC2394" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">4a Because data instances in GADT syntax can have two return kinds (see</span></span>
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2395
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<pre style="margin: 0;">-<span id="LC2395" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> point (2) above), we must check both return kinds. The user-written return</span></span>
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2396
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<pre style="margin: 0;">-<span id="LC2396" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> kind is checked by the call to checkDataKindSig in tcDataFamInstDecl. Examples:</span></span>
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2397
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<pre style="margin: 0;">-<span id="LC2397" class="line" lang="haskell"></span>
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2398
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<pre style="margin: 0;">-<span id="LC2398" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data family D (a :: Nat) :: k -- good (see Point 6)</span></span>
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2399
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<pre style="margin: 0;">-<span id="LC2399" class="line" lang="haskell"></span>
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2400
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<pre style="margin: 0;">-<span id="LC2400" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data instance D 1 :: Type -- good</span></span>
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2401
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<pre style="margin: 0;">-<span id="LC2401" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data instance D 2 :: F Bool -- bad</span></span>
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2402
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<pre style="margin: 0;">-<span id="LC2402" class="line" lang="haskell"></span>
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2403
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<pre style="margin: 0;">-<span id="LC2403" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">5. Newtype return kind restriction: If -XUnliftedNewtypes is on, then</span></span>
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<pre style="margin: 0;">-<span id="LC2404" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a newtype/newtype-instance return kind must end in TYPE xyz, for some</span></span>
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2405
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<pre style="margin: 0;">-<span id="LC2405" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> xyz (after type synonym expansion). The "xyz" may include type families,</span></span>
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2406
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<pre style="margin: 0;">-<span id="LC2406" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> but the TYPE part must be visible with expanding type families (only synonyms).</span></span>
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2407
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<pre style="margin: 0;">-<span id="LC2407" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> This kind is unified with the kind of the representation type (the type</span></span>
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2408
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<pre style="margin: 0;">-<span id="LC2408" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> of the one argument to the one constructor). See also steps (2) and (3)</span></span>
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2409
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<pre style="margin: 0;">-<span id="LC2409" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> of Note [Implementation of UnliftedNewtypes].</span></span>
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2410
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<pre style="margin: 0;">-<span id="LC2410" class="line" lang="haskell"></span>
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2411
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<pre style="margin: 0;">-<span id="LC2411" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> If -XUnliftedNewtypes is not on, then newtypes are treated just like datatypes.</span></span>
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2412
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<pre style="margin: 0;">-<span id="LC2412" class="line" lang="haskell"></span>
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2413
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<pre style="margin: 0;">-<span id="LC2413" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The checks are done in the same places as for datatypes.</span></span>
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2414
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<pre style="margin: 0;">-<span id="LC2414" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Examples (assume -XUnliftedNewtypes):</span></span>
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2415
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<pre style="margin: 0;">-<span id="LC2415" class="line" lang="haskell"></span>
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2416
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<pre style="margin: 0;">-<span id="LC2416" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> newtype N1 :: Type -- good</span></span>
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2417
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<pre style="margin: 0;">-<span id="LC2417" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> newtype N2 :: Bool -> Type -- good</span></span>
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2418
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<pre style="margin: 0;">-<span id="LC2418" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> newtype N3 :: forall r. Bool -> TYPE r -- good</span></span>
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2419
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<pre style="margin: 0;">-<span id="LC2419" class="line" lang="haskell"></span>
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2420
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<pre style="margin: 0;">-<span id="LC2420" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type family F (t :: Type) :: RuntimeRep</span></span>
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2421
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<pre style="margin: 0;">-<span id="LC2421" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> newtype N4 :: forall t -> TYPE (F t) -- good</span></span>
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2422
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<pre style="margin: 0;">-<span id="LC2422" class="line" lang="haskell"></span>
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2423
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<pre style="margin: 0;">-<span id="LC2423" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type family STAR where</span></span>
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2424
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<pre style="margin: 0;">-<span id="LC2424" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> STAR = Type</span></span>
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2425
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<pre style="margin: 0;">-<span id="LC2425" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> newtype N5 :: Bool -> STAR -- bad</span></span>
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2426
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<pre style="margin: 0;">-<span id="LC2426" class="line" lang="haskell"></span>
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2427
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<pre style="margin: 0;">-<span id="LC2427" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">6. Family return kind restrictions: The return kind of a data family must</span></span>
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2428
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<pre style="margin: 0;">-<span id="LC2428" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> be either TYPE xyz (for some xyz) or a kind variable. The idea is that</span></span>
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2429
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<pre style="margin: 0;">-<span id="LC2429" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instances may specialise the kind variable to fit one of the restrictions</span></span>
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2430
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<pre style="margin: 0;">-<span id="LC2430" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> above. This is checked by the call to checkDataKindSig in tcFamDecl1.</span></span>
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2431
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<pre style="margin: 0;">-<span id="LC2431" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Examples:</span></span>
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2432
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<pre style="margin: 0;">-<span id="LC2432" class="line" lang="haskell"></span>
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2433
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<pre style="margin: 0;">-<span id="LC2433" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data family D1 :: Type -- good</span></span>
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2434
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<pre style="margin: 0;">-<span id="LC2434" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data family D2 :: Bool -> Type -- good</span></span>
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2435
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<pre style="margin: 0;">-<span id="LC2435" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data family D3 k :: k -- good</span></span>
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2436
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<pre style="margin: 0;">-<span id="LC2436" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data family D4 :: forall k -> k -- good</span></span>
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2437
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<pre style="margin: 0;">-<span id="LC2437" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data family D5 :: forall k. k -> k -- good</span></span>
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2438
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<pre style="margin: 0;">-<span id="LC2438" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data family D6 :: forall r. TYPE r -- good</span></span>
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2439
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<pre style="margin: 0;">-<span id="LC2439" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data family D7 :: Bool -> STAR -- bad (see STAR from point 5)</span></span>
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2440
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<pre style="margin: 0;">-<span id="LC2440" class="line" lang="haskell"></span>
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2441
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<pre style="margin: 0;">-<span id="LC2441" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">7. Two return kinds for instances: If an instance has two return kinds,</span></span>
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2442
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<pre style="margin: 0;">-<span id="LC2442" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> one from the family declaration and one from the instance declaration</span></span>
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2443
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<pre style="margin: 0;">-<span id="LC2443" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (see point (2) above), they are unified. More accurately, we make sure</span></span>
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2444
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<pre style="margin: 0;">-<span id="LC2444" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> that the kind of the applied data family is a subkind of the user-written</span></span>
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2445
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<pre style="margin: 0;">-<span id="LC2445" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> kind. GHC.Tc.Gen.HsType.checkExpectedKind normally does this check for types, but</span></span>
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2446
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<pre style="margin: 0;">-<span id="LC2446" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> that's overkill for our needs here. Instead, we just instantiate any</span></span>
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2447
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<pre style="margin: 0;">-<span id="LC2447" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> invisible binders in the (instantiated) kind of the data family</span></span>
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2448
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<pre style="margin: 0;">-<span id="LC2448" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (called lhs_kind in tcDataFamInstHeader) with tcInstInvisibleTyBinders</span></span>
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2449
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<pre style="margin: 0;">-<span id="LC2449" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> and then unify the resulting kind with the kind written by the user.</span></span>
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2450
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<pre style="margin: 0;">-<span id="LC2450" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> This unification naturally produces a coercion, which we can drop, as</span></span>
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2451
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<pre style="margin: 0;">-<span id="LC2451" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the kind annotation on the instance is redundant (except perhaps for</span></span>
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2452
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<pre style="margin: 0;">-<span id="LC2452" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> effects of unification).</span></span>
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2453
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<pre style="margin: 0;">-<span id="LC2453" class="line" lang="haskell"></span>
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2454
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<pre style="margin: 0;">-<span id="LC2454" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Example:</span></span>
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2455
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<pre style="margin: 0;">-<span id="LC2455" class="line" lang="haskell"></span>
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2456
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<pre style="margin: 0;">-<span id="LC2456" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data Color = Red | Blue</span></span>
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2457
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<pre style="margin: 0;">-<span id="LC2457" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type family Interpret (x :: Color) :: RuntimeRep where</span></span>
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2458
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<pre style="margin: 0;">-<span id="LC2458" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Interpret 'Red = 'IntRep</span></span>
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2459
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<pre style="margin: 0;">-<span id="LC2459" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Interpret 'Blue = 'WordRep</span></span>
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2460
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<pre style="margin: 0;">-<span id="LC2460" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data family Foo (x :: Color) :: TYPE (Interpret x)</span></span>
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2461
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<pre style="margin: 0;">-<span id="LC2461" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> newtype instance Foo 'Red :: TYPE IntRep where</span></span>
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2462
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<pre style="margin: 0;">-<span id="LC2462" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> FooRedC :: Int# -> Foo 'Red</span></span>
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2463
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<pre style="margin: 0;">-<span id="LC2463" class="line" lang="haskell"></span>
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2464
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<pre style="margin: 0;">-<span id="LC2464" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Here we get that Foo 'Red :: TYPE (Interpret Red) and we have to</span></span>
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2465
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<pre style="margin: 0;">-<span id="LC2465" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> unify the kind with TYPE IntRep.</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="cm" style="color: #998; font-style: italic;"> Example requiring subkinding:</span></span>
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2468
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<pre style="margin: 0;">-<span id="LC2468" class="line" lang="haskell"></span>
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2469
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<pre style="margin: 0;">-<span id="LC2469" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data family D :: forall k. k</span></span>
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2470
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<pre style="margin: 0;">-<span id="LC2470" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data instance D :: Type -- forall k. k <: Type</span></span>
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2471
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<pre style="margin: 0;">-<span id="LC2471" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data instance D :: Type -> Type -- forall k. k <: Type -> Type</span></span>
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2472
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<pre style="margin: 0;">-<span id="LC2472" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- NB: these do not overlap</span></span>
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2473
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<pre style="margin: 0;">-<span id="LC2473" class="line" lang="haskell"></span>
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2474
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<pre style="margin: 0;">-<span id="LC2474" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> This all is Wrinkle (3) in Note [Implementation of UnliftedNewtypes].</span></span>
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2475
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<pre style="margin: 0;">-<span id="LC2475" class="line" lang="haskell"></span>
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2476
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2562
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<pre style="margin: 0;"> <span id="LC2562" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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2477
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2563
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<pre style="margin: 0;"> <span id="LC2563" class="line" lang="haskell"></span>
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2564
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<pre style="margin: 0;"> <span id="LC2564" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *********************************************************************</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2502,8 +2588,7 @@ tcFamDecl1 parent (FamilyDecl { fdInfo = fam_info</td>
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2502
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2588
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<pre style="margin: 0;"> <span id="LC2588" 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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2503
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2589
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<pre style="margin: 0;"> <span id="LC2589" 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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2504
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2590
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<pre style="margin: 0;"> <span id="LC2590" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See also Note [Datatype return kinds]</span></span>
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2505
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<pre style="margin: 0;">-<span id="LC2505" 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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2506
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<pre style="margin: 0;">-<span id="LC2506" 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="LC2591" 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;">res_kind</span></span>
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2507
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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;">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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2508
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2593
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<pre style="margin: 0;"> <span id="LC2593" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">inj</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Injective</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">replicate</span> <span class="p">(</span><span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">binders</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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2509
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2594
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<pre style="margin: 0;"> <span id="LC2594" class="line" lang="haskell"> <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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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2883" 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">@@ -2798,7 +2883,7 @@ tcTyFamInstEqn fam_tc mb_clsinfo</td>
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2883
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<pre style="margin: 0;"> <span id="LC2883" class="line" lang="haskell"> <span class="n" style="color: #333;">hs_pats</span> <span class="n" style="color: #333;">hs_rhs_ty</span></span>
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2799
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2884
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<pre style="margin: 0;"> <span id="LC2884" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Don't print results they may be knot-tied</span></span>
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2800
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2885
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<pre style="margin: 0;"> <span id="LC2885" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (tcFamInstEqnGuts zonks to Type)</span></span>
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2801
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<pre style="margin: 0;">-<span id="LC2801" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkCoAxBranch</span> <span class="n" style="color: #333;">qtvs</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;"><span class="idiff left">fam_tc</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">pats</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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2886
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<pre style="margin: 0;">+<span id="LC2886" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkCoAxBranch</span> <span class="n" style="color: #333;">qtvs</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">pats</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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2887
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<pre style="margin: 0;"> <span id="LC2887" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">const</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span><span class="p">)</span> <span class="n" style="color: #333;">qtvs</span><span class="p">)</span></span>
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2803
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2888
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<pre style="margin: 0;"> <span id="LC2888" class="line" lang="haskell"> <span class="n" style="color: #333;">loc</span><span class="p">)</span> <span class="p">}</span></span>
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2889
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<pre style="margin: 0;"> <span id="LC2889" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="3255" 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">@@ -3170,8 +3255,8 @@ tcConDecl rep_tycon tag_map tmpl_bndrs res_kind res_tmpl new_or_data</td>
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3170
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3255
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<pre style="margin: 0;"> <span id="LC3255" class="line" lang="haskell"> <span class="p">}</span></span>
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3171
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3256
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<pre style="margin: 0;"> <span id="LC3256" class="line" lang="haskell"></span>
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3172
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3257
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<pre style="margin: 0;"> <span id="LC3257" class="line" lang="haskell"><span class="n" style="color: #333;">tcConDecl</span> <span class="n" style="color: #333;">rep_tycon</span> <span class="n" style="color: #333;">tag_map</span> <span class="n" style="color: #333;">tmpl_bndrs</span> <span class="n" style="color: #333;">_res_kind</span> <span class="n" style="color: #333;">res_tmpl</span> <span class="n" style="color: #333;">new_or_data</span></span>
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3173
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<pre style="margin: 0;">-<span id="LC3173" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: don't use res_kind here, as it's ill-scoped. Instead,<span class="idiff left right"> we get</span></span></span>
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3174
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<pre style="margin: 0;">-<span id="LC3174" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the res_kind by typechecking the result type.</span></span>
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3258
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<pre style="margin: 0;">+<span id="LC3258" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: don't use res_kind here, as it's ill-scoped. Instead,</span></span>
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3259
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<pre style="margin: 0;">+<span id="LC3259" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">we get </span>the res_kind by typechecking the result type.</span></span>
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3175
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3260
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<pre style="margin: 0;"> <span id="LC3260" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ConDeclGADT</span> <span class="p">{</span> <span class="n" style="color: #333;">con_g_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implicit_tkv_nms</span></span>
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3176
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3261
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<pre style="margin: 0;"> <span id="LC3261" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">con_names</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">names</span></span>
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3177
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3262
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<pre style="margin: 0;"> <span id="LC3262" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">con_qvars</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">explicit_tkv_nms</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="3188" 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="3273" 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">@@ -3188,16 +3273,12 @@ tcConDecl rep_tycon tag_map tmpl_bndrs _res_kind res_tmpl new_or_data</td>
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3188
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3273
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<pre style="margin: 0;"> <span id="LC3273" class="line" lang="haskell"> <span class="n" style="color: #333;">bindImplicitTKBndrs_Skol</span> <span class="n" style="color: #333;">implicit_tkv_nms</span> <span class="o" style="font-weight: 600;">$</span></span>
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3189
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3274
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<pre style="margin: 0;"> <span id="LC3274" class="line" lang="haskell"> <span class="n" style="color: #333;">bindExplicitTKBndrs_Skol</span> <span class="n" style="color: #333;">explicit_tkv_nms</span> <span class="o" style="font-weight: 600;">$</span></span>
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3190
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3275
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<pre style="margin: 0;"> <span id="LC3275" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcHsMbContext</span> <span class="n" style="color: #333;">cxt</span></span>
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3191
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<pre style="margin: 0;">-<span id="LC3191" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">casted_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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3192
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<pre style="margin: 0;">-<span id="LC3192" 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="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">debugIsOn</span> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">discardCast</span> <span class="n" style="color: #333;">casted_res_ty</span></span>
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3193
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<pre style="margin: 0;">-<span id="LC3193" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">splitCastTy_maybe</span> <span class="n" style="color: #333;">casted_res_ty</span> <span class="kr" style="font-weight: 600;">of</span></span>
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3194
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<pre style="margin: 0;">-<span id="LC3194" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">ty</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="n" style="color: #333;">unlifted_nts</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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3195
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<pre style="margin: 0;">-<span id="LC3195" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">unlifted_nts</span> <span class="p">)</span></span>
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3196
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<pre style="margin: 0;">-<span id="LC3196" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MASSERT</span><span class="p">(</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 class="p">)</span></span>
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3197
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<pre style="margin: 0;">-<span id="LC3197" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">ty</span></span>
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3198
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<pre style="margin: 0;">-<span id="LC3198" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">casted_res_ty</span></span>
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3276
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<pre style="margin: 0;">+<span id="LC3276" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">res_ty</span><span class="p">,</span> <span class="n" style="color: #333;">res_kind</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInferLHsTypeKind</span> <span class="n" style="color: #333;">hs_res_ty</span></span>
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3277
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<pre style="margin: 0;">+<span id="LC3277" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [GADT return kinds]</span></span>
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3278
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<pre style="margin: 0;">+<span id="LC3278" class="line" lang="haskell"></span>
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3199
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3279
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<pre style="margin: 0;"> <span id="LC3279" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Datatype return kinds]</span></span>
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3200
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<pre style="margin: 0;">-<span id="LC3200" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">exp_kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">getArgExpKind</span> <span class="n" style="color: #333;">new_or_data</span> <span class="p">(</span><span class="n" style="color: #333;">typeKind</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span></span>
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3280
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<pre style="margin: 0;">+<span id="LC3280" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">exp_kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">getArgExpKind</span> <span class="n" style="color: #333;">new_or_data</span> <span class="n" style="color: #333;">res_kind</span></span>
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3281
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<pre style="margin: 0;">+<span id="LC3281" class="line" lang="haskell"></span>
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3201
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3282
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<pre style="margin: 0;"> <span id="LC3282" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">btys</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcConArgs</span> <span class="n" style="color: #333;">exp_kind</span> <span class="n" style="color: #333;">hs_args</span></span>
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3202
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3283
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<pre style="margin: 0;"> <span id="LC3283" 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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3203
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3284
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<pre style="margin: 0;"> <span id="LC3284" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">field_lbls</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupConstructorFields</span> <span class="n" style="color: #333;">name</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -3252,6 +3333,20 @@ tcConDecl rep_tycon tag_map tmpl_bndrs _res_kind res_tmpl new_or_data</td>
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3252
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3333
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<pre style="margin: 0;"> <span id="LC3333" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">buildOneDataCon</span> <span class="n" style="color: #333;">names</span></span>
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3253
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<pre style="margin: 0;"> <span id="LC3334" class="line" lang="haskell"> <span class="p">}</span></span>
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3254
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3335
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<pre style="margin: 0;"> <span id="LC3335" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3336" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [GADT return kinds]</span></span>
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3337
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<pre style="margin: 0;">+<span id="LC3337" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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3338
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<pre style="margin: 0;">+<span id="LC3338" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider</span></span>
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3339
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<pre style="margin: 0;">+<span id="LC3339" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type family Star where Star = Type</span></span>
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3340
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<pre style="margin: 0;">+<span id="LC3340" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T :: Type where</span></span>
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3341
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<pre style="margin: 0;">+<span id="LC3341" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkT :: Int -> T</span></span>
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3342
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<pre style="margin: 0;">+<span id="LC3342" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3343" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If, for some stupid reason, tcInferLHsTypeKind on the return type of</span></span>
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<pre style="margin: 0;">+<span id="LC3344" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">MkT returned (T |> ax, Star), then the return-type check in</span></span>
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<pre style="margin: 0;">+<span id="LC3345" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">checkValidDataCon would reject the decl (although of course there is</span></span>
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3346
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<pre style="margin: 0;">+<span id="LC3346" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">nothing wrong with it). We are implicitly requiring tha</span></span>
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<pre style="margin: 0;">+<span id="LC3347" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">tcInferLHsTypeKind doesn't any gratuitous top-level casts.</span></span>
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<pre style="margin: 0;">+<span id="LC3348" 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="LC3349" class="line" lang="haskell"></span>
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3255
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3350
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<pre style="margin: 0;"> <span id="LC3350" class="line" lang="haskell"><span class="cd">-- | Produce an "expected kind" for the arguments of a data/newtype.</span></span>
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3351
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<pre style="margin: 0;"> <span id="LC3351" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If the declaration is indeed for a newtype,</span></span>
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<pre style="margin: 0;"> <span id="LC3352" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- then this expected kind will be the kind provided. Otherwise,</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">@@ -3924,11 +4019,16 @@ checkValidDataCon dflags existential_ok tc con</td>
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4019
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<pre style="margin: 0;"> <span id="LC4019" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">orig_res_ty</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">tcTypeKind</span> <span class="n" style="color: #333;">orig_res_ty</span><span class="p">)])</span></span>
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4020
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<pre style="margin: 0;"> <span id="LC4020" class="line" lang="haskell"></span>
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4021
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<pre style="margin: 0;"> <span id="LC4021" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC3927" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">checkTc</span> <span class="p">(</span><span class="n" style="color: #333;">isJust</span> <span class="p">(</span><span class="n" style="color: #333;">tcMatchTy</span> <span class="n" style="color: #333;">res_ty_tmpl</span> <span class="n" style="color: #333;">orig_res_ty</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC4022" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">checkTc</span> <span class="p">(</span><span class="n" style="color: #333;">isJust</span> <span class="p">(</span><span class="n" style="color: #333;">tcMatchTy<span class="idiff left right">Ki</span></span> <span class="n" style="color: #333;">res_ty_tmpl</span> <span class="n" style="color: #333;">orig_res_ty</span><span class="p">))</span></span>
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3928
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<pre style="margin: 0;"> <span id="LC4023" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">badDataConTyCon</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">res_ty_tmpl</span><span class="p">)</span></span>
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3929
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4024
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<pre style="margin: 0;"> <span id="LC4024" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note that checkTc aborts if it finds an error. This is</span></span>
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3930
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4025
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<pre style="margin: 0;"> <span id="LC4025" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- critical to avoid panicking when we call dataConDisplayType</span></span>
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3931
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4026
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<pre style="margin: 0;"> <span id="LC4026" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- on an un-rejiggable datacon!</span></span>
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<pre style="margin: 0;">+<span id="LC4027" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Also NB that we match the *kind* as well as the *type* (#18357)</span></span>
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4028
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<pre style="margin: 0;">+<span id="LC4028" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- However, if the kind is the only thing that doesn't match, the</span></span>
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4029
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<pre style="margin: 0;">+<span id="LC4029" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- error message is terrible. E.g. test T18357b</span></span>
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4030
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<pre style="margin: 0;">+<span id="LC4030" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- type family Star where Star = Type</span></span>
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<pre style="margin: 0;">+<span id="LC4031" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- newtype T :: Type where MkT :: Int -> (T :: Star)</span></span>
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<pre style="margin: 0;"> <span id="LC4032" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC4033" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"checkValidDataCon 2"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">data_con_display_type</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC4034" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4bf18646acbb5a59ad8716aedc32acfe2ead0f58#e63425e031ffe9350ee6b1687e506aaea75d11e1"><strong>compiler/GHC/Tc/TyCl/Instance.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -704,7 +704,6 @@ tcDataFamInstDecl mb_clsinfo tv_skol_env</td>
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<pre style="margin: 0;"> <span id="LC704" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC705" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Check the result kind; it may come from a user-written signature.</span></span>
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<pre style="margin: 0;"> <span id="LC706" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Datatype return kinds] in GHC.Tc.TyCl point 4(a)</span></span>
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<pre style="margin: 0;">-<span id="LC707" 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="LC707" 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="LC708" 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="LC709" 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">@@ -713,10 +712,12 @@ tcDataFamInstDecl mb_clsinfo tv_skol_env</td>
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<pre style="margin: 0;"> <span id="LC712" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tcDataFamInstDecl"</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC713" class="line" lang="haskell"> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Fam tycon:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fam_tc</span></span>
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<pre style="margin: 0;"> <span id="LC714" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Pats:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">pats</span></span>
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716
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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;">text</span> <span class="s" style="color: #d14;">"visibli<span class="idiff left right">i</span>ties:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">tcbVisibilities</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">pats</span><span class="p">)</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;">text</span> <span class="s" style="color: #d14;">"visiblities:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">tcbVisibilities</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">pats</span><span class="p">)</span></span>
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717
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716
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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;">text</span> <span class="s" style="color: #d14;">"all_pats:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">all_pats</span></span>
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718
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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;">text</span> <span class="s" style="color: #d14;">"ty_binders"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty_binders</span></span>
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718
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<pre style="margin: 0;"> <span id="LC718" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"fam_tc_binders:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">tyConBinders</span> <span class="n" style="color: #333;">fam_tc</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC719" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"res_kind:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">res_kind</span></span>
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<pre style="margin: 0;">+<span id="LC720" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"final_res_kind:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">final_res_kind</span></span>
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<pre style="margin: 0;"> <span id="LC721" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"eta_pats"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">eta_pats</span></span>
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<pre style="margin: 0;"> <span id="LC722" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"eta_tcbs"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">eta_tcbs</span> <span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC723" 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">@@ -734,9 +735,9 @@ tcDataFamInstDecl mb_clsinfo tv_skol_env</td>
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<pre style="margin: 0;"> <span id="LC735" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NewType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">data_cons</span><span class="p">)</span> <span class="p">)</span></span>
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736
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<pre style="margin: 0;"> <span id="LC736" class="line" lang="haskell"> <span class="n" style="color: #333;">mkNewTyConRhs</span> <span class="n" style="color: #333;">rep_tc_name</span> <span class="n" style="color: #333;">rec_rep_tc</span> <span class="p">(</span><span class="n" style="color: #333;">head</span> <span class="n" style="color: #333;">data_cons</span><span class="p">)</span></span>
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737
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<pre style="margin: 0;"> <span id="LC737" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC737" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ax<span class="idiff left">iom</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">mkSingleCoAxiom</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Representational</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">axiom_name</span></span></span>
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738
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<pre style="margin: 0;">-<span id="LC738" class="line" lang="haskell"> <span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff">post_eta_qtvs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">eta_tvs</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">[]</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fam_tc</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">eta_pats</span></span></span>
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739
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<pre style="margin: 0;">-<span id="LC739" class="line" lang="haskell"> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">mkTyConApp</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rep_tc</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">mkTyVarTys</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">post_eta_qtvs</span></span><span class="p"><span class="idiff right">))</span></span></span>
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<pre style="margin: 0;">+<span id="LC738" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ax<span class="idiff left">_rhs</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">mkTyConApp</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rep_tc</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">mkTyVarTys</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">post_eta_qtvs</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC739" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">axiom</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">mkSingleCoAxiom</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Representational</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">axiom_name</span></span></span>
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<pre style="margin: 0;">+<span id="LC740" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">post_eta_qtvs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">eta_tvs</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">[]</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fam_tc</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">eta_pats</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">ax_rhs</span></span></span>
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<pre style="margin: 0;"> <span id="LC741" class="line" lang="haskell"> <span class="n" style="color: #333;">parent</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">DataFamInstTyCon</span> <span class="n" style="color: #333;">axiom</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">all_pats</span></span>
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<pre style="margin: 0;"> <span id="LC742" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC743" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: Use the full ty_binders from the pats. See bullet toward</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">@@ -851,13 +852,17 @@ tcDataFamInstHeader</td>
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<pre style="margin: 0;"> <span id="LC852" class="line" lang="haskell"><span class="n" style="color: #333;">tcDataFamInstHeader</span> <span class="n" style="color: #333;">mb_clsinfo</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">imp_vars</span> <span class="n" style="color: #333;">mb_bndrs</span> <span class="n" style="color: #333;">fixity</span></span>
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852
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853
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<pre style="margin: 0;"> <span id="LC853" class="line" lang="haskell"> <span class="n" style="color: #333;">hs_ctxt</span> <span class="n" style="color: #333;">hs_pats</span> <span class="n" style="color: #333;">m_ksig</span> <span class="n" style="color: #333;">hs_cons</span> <span class="n" style="color: #333;">new_or_data</span></span>
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853
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854
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<pre style="margin: 0;"> <span id="LC854" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tcDataFamInstHeader {"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fam_tc</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">hs_pats</span><span class="p">)</span></span>
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854
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<pre style="margin: 0;">-<span id="LC854" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">imp_tvs</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">exp_tvs</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">stupid_theta</span><span class="p">,</span> <span class="n" style="color: #333;">lhs_ty</span><span class="p">,</span> <span class="n" style="color: #333;">res_kind</span><span class="p">)))</span></span>
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855
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<pre style="margin: 0;">+<span id="LC855" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">imp_tvs</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">exp_tvs</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">stupid_theta</span><span class="p">,</span> <span class="n" style="color: #333;">lhs_ty</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left">master_res_kind</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">instance_</span>res_kind</span><span class="p">)))</span></span>
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855
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856
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<pre style="margin: 0;"> <span id="LC856" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pushTcLevelM_</span> <span class="o" style="font-weight: 600;">$</span></span>
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856
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857
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<pre style="margin: 0;"> <span id="LC857" class="line" lang="haskell"> <span class="n" style="color: #333;">solveEqualities</span> <span class="o" style="font-weight: 600;">$</span></span>
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857
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858
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<pre style="margin: 0;"> <span id="LC858" class="line" lang="haskell"> <span class="n" style="color: #333;">bindImplicitTKBndrs_Q_Skol</span> <span class="n" style="color: #333;">imp_vars</span> <span class="o" style="font-weight: 600;">$</span></span>
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858
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859
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<pre style="margin: 0;"> <span id="LC859" class="line" lang="haskell"> <span class="n" style="color: #333;">bindExplicitTKBndrs_Q_Skol</span> <span class="kt" style="color: #458; font-weight: 600;">AnyKind</span> <span class="n" style="color: #333;">exp_bndrs</span> <span class="o" style="font-weight: 600;">$</span></span>
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859
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860
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<pre style="margin: 0;"> <span id="LC860" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <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;">tcHsContext</span> <span class="n" style="color: #333;">hs_ctxt</span></span>
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860
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861
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<pre style="margin: 0;"> <span id="LC861" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">lhs_ty</span><span class="p">,</span> <span class="n" style="color: #333;">lhs_kind</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcFamTyPats</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">hs_pats</span></span>
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862
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<pre style="margin: 0;">+<span id="LC862" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">lhs_applied_ty</span><span class="p">,</span> <span class="n" style="color: #333;">lhs_applied_kind</span><span class="p">)</span></span>
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863
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<pre style="margin: 0;">+<span id="LC863" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInstInvisibleTyBinders</span> <span class="n" style="color: #333;">lhs_ty</span> <span class="n" style="color: #333;">lhs_kind</span></span>
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<pre style="margin: 0;">+<span id="LC864" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Data family/instance return kinds]</span></span>
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865
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<pre style="margin: 0;">+<span id="LC865" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in GHC.Tc.TyCl point (DF3)</span></span>
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861
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866
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<pre style="margin: 0;"> <span id="LC866" class="line" lang="haskell"></span>
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862
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867
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<pre style="margin: 0;"> <span id="LC867" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Ensure that the instance is consistent</span></span>
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868
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<pre style="margin: 0;"> <span id="LC868" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- with its parent class</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">@@ -869,21 +874,17 @@ tcDataFamInstHeader mb_clsinfo fam_tc imp_vars mb_bndrs fixity</td>
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869
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874
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<pre style="margin: 0;"> <span id="LC874" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Add constraints from the data constructors</span></span>
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870
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875
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<pre style="margin: 0;"> <span id="LC875" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">kcConDecls</span> <span class="n" style="color: #333;">new_or_data</span> <span class="n" style="color: #333;">res_kind</span> <span class="n" style="color: #333;">hs_cons</span></span>
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871
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876
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<pre style="margin: 0;"> <span id="LC876" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC872" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Datatype return kinds] in GHC.Tc.TyCl, point (7).</span></span>
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<pre style="margin: 0;">-<span id="LC873" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">lhs_extra_args</span><span class="p">,</span> <span class="n" style="color: #333;">lhs_applied_kind</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC874" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInstInvisibleTyBinders</span> <span class="p">(</span><span class="n" style="color: #333;">invisibleTyBndrCount</span> <span class="n" style="color: #333;">lhs_kind</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC875" class="line" lang="haskell"> <span class="n" style="color: #333;">lhs_kind</span></span>
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<pre style="margin: 0;">-<span id="LC876" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">lhs_applied_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lhs_ty</span> <span class="p">`</span><span class="n" style="color: #333;">mkTcAppTys</span><span class="p">`</span> <span class="n" style="color: #333;">lhs_extra_args</span></span>
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<pre style="margin: 0;">-<span id="LC877" class="line" lang="haskell"> <span class="n" style="color: #333;">hs_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nlHsTyConApp</span> <span class="n" style="color: #333;">fixity</span> <span class="p">(</span><span class="n" style="color: #333;">getName</span> <span class="n" style="color: #333;">fam_tc</span><span class="p">)</span> <span class="n" style="color: #333;">hs_pats</span></span>
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<pre style="margin: 0;">+<span id="LC877" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Check that the result kind of the TyCon applied to its args</span></span>
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<pre style="margin: 0;">+<span id="LC878" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- is compatible with the explicit signature (or Type, if there</span></span>
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<pre style="margin: 0;">+<span id="LC879" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- is none)</span></span>
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<pre style="margin: 0;">+<span id="LC880" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">hs_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nlHsTyConApp</span> <span class="n" style="color: #333;">fixity</span> <span class="p">(</span><span class="n" style="color: #333;">getName</span> <span class="n" style="color: #333;">fam_tc</span><span class="p">)</span> <span class="n" style="color: #333;">hs_pats</span></span>
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<pre style="margin: 0;"> <span id="LC881" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unifyKind</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">hs_lhs</span><span class="p">))</span> <span class="n" style="color: #333;">lhs_applied_kind</span> <span class="n" style="color: #333;">res_kind</span></span>
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<pre style="margin: 0;">-<span id="LC879" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Check that the result kind of the TyCon applied to its args</span></span>
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<pre style="margin: 0;">-<span id="LC880" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- is compatible with the explicit signature (or Type, if there</span></span>
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<pre style="margin: 0;">-<span id="LC881" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- is none)</span></span>
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<pre style="margin: 0;"> <span id="LC882" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC883" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tcDataFamInstHeader"</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC884" class="line" lang="haskell"> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fam_tc</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">m_ksig</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">lhs_applied_kind</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</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="LC885" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span> <span class="n" style="color: #333;">stupid_theta</span></span>
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<pre style="margin: 0;"> <span id="LC886" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">lhs_applied_ty</span></span>
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<pre style="margin: 0;">+<span id="LC887" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">lhs_applied_kind</span></span>
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<pre style="margin: 0;"> <span id="LC888" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">res_kind</span> <span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC889" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC890" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See GHC.Tc.TyCl Note [Generalising in tcFamTyPatsGuts]</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">@@ -900,13 +901,17 @@ tcDataFamInstHeader mb_clsinfo fam_tc imp_vars mb_bndrs fixity</td>
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<pre style="margin: 0;"> <span id="LC901" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">ze</span><span class="p">,</span> <span class="n" style="color: #333;">qtvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkTyBndrs</span> <span class="n" style="color: #333;">qtvs</span></span>
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902
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<pre style="margin: 0;"> <span id="LC902" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">lhs_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkTcTypeToTypeX</span> <span class="n" style="color: #333;">ze</span> <span class="n" style="color: #333;">lhs_ty</span></span>
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903
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<pre style="margin: 0;"> <span id="LC903" 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;">zonkTcTypesToTypesX</span> <span class="n" style="color: #333;">ze</span> <span class="n" style="color: #333;">stupid_theta</span></span>
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903
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<pre style="margin: 0;">-<span id="LC903" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">res_kind</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkTcTypeToTypeX</span> <span class="n" style="color: #333;">ze</span> <span class="n" style="color: #333;">res_kind</span></span>
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904
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<pre style="margin: 0;">+<span id="LC904" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">master_res_kind</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkTcTypeToTypeX</span> <span class="n" style="color: #333;">ze</span> <span class="n" style="color: #333;">master_res_kind</span></span>
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<pre style="margin: 0;">+<span id="LC905" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">instance_res_kind</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkTcTypeToTypeX</span> <span class="n" style="color: #333;">ze</span> <span class="n" style="color: #333;">instance_res_kind</span></span>
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906
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<pre style="margin: 0;"> <span id="LC906" class="line" lang="haskell"></span>
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907
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<pre style="margin: 0;"> <span id="LC907" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We check that res_kind is OK with checkDataKindSig in</span></span>
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906
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908
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<pre style="margin: 0;"> <span id="LC908" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- tcDataFamInstDecl, after eta-expansion. We need to check that</span></span>
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909
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<pre style="margin: 0;"> <span id="LC909" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- it's ok because res_kind can come from a user-written kind signature.</span></span>
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910
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<pre style="margin: 0;"> <span id="LC910" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Datatype return kinds], point (4a)</span></span>
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911
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<pre style="margin: 0;"> <span id="LC911" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC912" 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;">master_res_kind</span></span>
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913
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<pre style="margin: 0;">+<span id="LC913" 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;">instance_res_kind</span></span>
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914
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<pre style="margin: 0;">+<span id="LC914" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC915" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Check that type patterns match the class instance head</span></span>
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916
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<pre style="margin: 0;"> <span id="LC916" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The call to splitTyConApp_maybe here is just an inlining of</span></span>
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917
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<pre style="margin: 0;"> <span id="LC917" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the body of unravelFamInstPats.</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="919" 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">@@ -914,7 +919,7 @@ tcDataFamInstHeader mb_clsinfo fam_tc imp_vars mb_bndrs fixity</td>
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914
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919
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<pre style="margin: 0;"> <span id="LC919" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">pats</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">pats</span></span>
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<pre style="margin: 0;"> <span id="LC920" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"tcDataFamInstHeader"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">lhs_ty</span><span class="p">)</span></span>
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916
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921
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<pre style="margin: 0;"> <span id="LC921" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC917" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">qtvs</span><span class="p">,</span> <span class="n" style="color: #333;">pats</span><span class="p">,</span> <span class="n" style="color: #333;">res_kind</span><span class="p">,</span> <span class="n" style="color: #333;">stupid_theta</span><span class="p">)</span> <span class="p">}</span></span>
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922
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<pre style="margin: 0;">+<span id="LC922" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">qtvs</span><span class="p">,</span> <span class="n" style="color: #333;">pats</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">master_</span>res_kind</span><span class="p">,</span> <span class="n" style="color: #333;">stupid_theta</span><span class="p">)</span> <span class="p">}</span></span>
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918
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923
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<pre style="margin: 0;"> <span id="LC923" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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919
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924
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<pre style="margin: 0;"> <span id="LC924" class="line" lang="haskell"> <span class="n" style="color: #333;">fam_name</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyConName</span> <span class="n" style="color: #333;">fam_tc</span></span>
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920
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925
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<pre style="margin: 0;"> <span id="LC925" class="line" lang="haskell"> <span class="n" style="color: #333;">data_ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">DataKindCtxt</span> <span class="n" style="color: #333;">fam_name</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">@@ -973,7 +978,7 @@ however, so this Note aims to describe these subtleties:</td>
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973
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978
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<pre style="margin: 0;"> <span id="LC978" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* The representation tycon Drep is parameterised over the free</span></span>
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974
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<pre style="margin: 0;"> <span id="LC979" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> variables of the pattern, in no particular order. So there is no</span></span>
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980
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<pre style="margin: 0;"> <span id="LC980" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> guarantee that 'p' and 'q' will come last in Drep's parameters, and</span></span>
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<pre style="margin: 0;">-<span id="LC976" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in the right order. So, if the /patterns/ of the family ins<span class="idiff left right">a</span>tance</span></span>
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<pre style="margin: 0;">+<span id="LC981" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in the right order. So, if the /patterns/ of the family instance</span></span>
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<pre style="margin: 0;"> <span id="LC982" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> are eta-reducible, we re-order Drep's parameters to put the</span></span>
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<pre style="margin: 0;"> <span id="LC983" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> eta-reduced type variables last.</span></span>
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<pre style="margin: 0;"> <span id="LC984" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4bf18646acbb5a59ad8716aedc32acfe2ead0f58#7dcf5b567a6cd3c9d98cf8d57323fbca1b1536e9"><strong>compiler/GHC/Tc/Types.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">@@ -79,7 +79,10 @@ module GHC.Tc.Types(</td>
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<pre style="margin: 0;"> <span id="LC79" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC80" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Role annotations</span></span>
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<pre style="margin: 0;"> <span id="LC81" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">RoleAnnotEnv</span><span class="p">,</span> <span class="n" style="color: #333;">emptyRoleAnnotEnv</span><span class="p">,</span> <span class="n" style="color: #333;">mkRoleAnnotEnv</span><span class="p">,</span></span>
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82
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<pre style="margin: 0;">-<span id="LC82" class="line" lang="haskell"> <span class="n" style="color: #333;">lookupRoleAnnot</span><span class="p">,</span> <span class="n" style="color: #333;">getRoleAnnots</span></span>
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82
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<pre style="margin: 0;">+<span id="LC82" class="line" lang="haskell"> <span class="n" style="color: #333;">lookupRoleAnnot</span><span class="p">,</span> <span class="n" style="color: #333;">getRoleAnnots</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC83" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC84" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Linting</span></span>
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<pre style="margin: 0;">+<span id="LC85" class="line" lang="haskell"> <span class="n" style="color: #333;">lintGblEnv</span></span>
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<pre style="margin: 0;"> <span id="LC86" class="line" lang="haskell"> <span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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87
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<pre style="margin: 0;"> <span id="LC87" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC88" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="n" style="color: #333;">include</span> <span class="s" style="color: #d14;">"HsVersions.h"</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">@@ -93,6 +96,7 @@ import GHC.Tc.Types.Evidence</td>
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93
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<pre style="margin: 0;"> <span id="LC96" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Type</span></span>
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94
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<pre style="margin: 0;"> <span id="LC97" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCon</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tyConKind</span> <span class="p">)</span></span>
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95
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<pre style="margin: 0;"> <span id="LC98" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.PatSyn</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">PatSyn</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC99" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Lint</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">lintAxioms</span> <span class="p">)</span></span>
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96
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<pre style="margin: 0;"> <span id="LC100" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Id</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">idType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">idName</span> <span class="p">)</span></span>
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97
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<pre style="margin: 0;"> <span id="LC101" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.FieldLabel</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">FieldLabel</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC102" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.UsageEnv</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1742" 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">@@ -1738,3 +1742,16 @@ lookupRoleAnnot = lookupNameEnv</td>
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1738
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1742
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<pre style="margin: 0;"> <span id="LC1742" class="line" lang="haskell"><span class="n" style="color: #333;">getRoleAnnots</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RoleAnnotEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LRoleAnnotDecl</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">]</span></span>
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1739
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1743
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<pre style="margin: 0;"> <span id="LC1743" class="line" lang="haskell"><span class="n" style="color: #333;">getRoleAnnots</span> <span class="n" style="color: #333;">bndrs</span> <span class="n" style="color: #333;">role_env</span></span>
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1740
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1744
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<pre style="margin: 0;"> <span id="LC1744" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapMaybe</span> <span class="p">(</span><span class="n" style="color: #333;">lookupRoleAnnot</span> <span class="n" style="color: #333;">role_env</span><span class="p">)</span> <span class="n" style="color: #333;">bndrs</span></span>
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1745
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<pre style="margin: 0;">+<span id="LC1745" class="line" lang="haskell"></span>
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1746
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<pre style="margin: 0;">+<span id="LC1746" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *********************************************************************</span></span>
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1747
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<pre style="margin: 0;">+<span id="LC1747" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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1748
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<pre style="margin: 0;">+<span id="LC1748" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Linting a TcGblEnv</span></span>
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1749
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<pre style="margin: 0;">+<span id="LC1749" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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1750
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<pre style="margin: 0;">+<span id="LC1750" 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="LC1751" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1752" class="line" lang="haskell"><span class="cd">-- | Check the 'TcGblEnv' for consistency. Currently, only checks</span></span>
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<pre style="margin: 0;">+<span id="LC1753" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- axioms, but should check other aspects, too.</span></span>
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<pre style="margin: 0;">+<span id="LC1754" class="line" lang="haskell"><span class="n" style="color: #333;">lintGblEnv</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;">TcGblEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1755" class="line" lang="haskell"><span class="n" style="color: #333;">lintGblEnv</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">tcg_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lintAxioms</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">axioms</span></span>
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<pre style="margin: 0;">+<span id="LC1756" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC1757" class="line" lang="haskell"> <span class="n" style="color: #333;">axioms</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">typeEnvCoAxioms</span> <span class="p">(</span><span class="n" style="color: #333;">tcg_type_env</span> <span class="n" style="color: #333;">tcg_env</span><span class="p">)</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4bf18646acbb5a59ad8716aedc32acfe2ead0f58#59d42d45d27a766c3ef299d73c226697153b7f6e"><strong>compiler/GHC/Tc/Utils/Instantiate.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">@@ -16,7 +16,7 @@ module GHC.Tc.Utils.Instantiate (</td>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">instCall</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">instDFunType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">instStupidTheta</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">instTyVarsWith</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">newWanted</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">newWanteds</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC19" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcInstInvisibleTyBinders</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcInstInvisibleTyBinder</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcInstInvisibleTyBinders<span class="idiff left">N</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">tcInstInvisibleTyBinders</span></span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcInstInvisibleTyBinder</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">newOverloadedLit</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkOverLit</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC22" 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">@@ -366,13 +366,19 @@ instStupidTheta orig theta</td>
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<pre style="margin: 0;"> <span id="LC366" 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="LC367" 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="LC368" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC369" class="line" lang="haskell"><span class="cd">-- | Instantiates up to n invisible binders</span></span>
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<pre style="margin: 0;">-<span id="LC370" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns the instantiating types, and body kind</span></span>
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<pre style="margin: 0;">-<span id="LC371" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstInvisibleTyBinders</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;">TcKind</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">TcKind</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC369" class="line" lang="haskell"><span class="cd">-- | Given ty::forall k1 k2. k, instantiate all the invisible forall-binders</span></span>
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<pre style="margin: 0;">+<span id="LC370" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- returning ty @kk1 @kk2 :: k[kk1/k1, kk2/k1]</span></span>
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<pre style="margin: 0;">+<span id="LC371" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstInvisibleTyBinders</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcKind</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcKind</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC372" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstInvisibleTyBinders</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">kind</span></span>
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<pre style="margin: 0;">+<span id="LC373" 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="p">(</span><span class="n" style="color: #333;">extra_args</span><span class="p">,</span> <span class="n" style="color: #333;">kind'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInstInvisibleTyBindersN</span> <span class="n" style="color: #333;">n_invis</span> <span class="n" style="color: #333;">kind</span></span>
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<pre style="margin: 0;">+<span id="LC374" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkAppTys</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">extra_args</span><span class="p">,</span> <span class="n" style="color: #333;">kind'</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC375" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC376" class="line" lang="haskell"> <span class="n" style="color: #333;">n_invis</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">invisibleTyBndrCount</span> <span class="n" style="color: #333;">kind</span></span>
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<pre style="margin: 0;"> <span id="LC377" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC373" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstInvisibleTyBinders</span> <span class="mi" style="color: #099;">0</span> <span class="n" style="color: #333;">kind</span></span>
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<pre style="margin: 0;">+<span id="LC378" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstInvisibleTyBindersN</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;">TcKind</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">TcKind</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC379" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstInvisibleTyBindersN</span> <span class="mi" style="color: #099;">0</span> <span class="n" style="color: #333;">kind</span></span>
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<pre style="margin: 0;"> <span id="LC380" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span> <span class="n" style="color: #333;">kind</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC375" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstInvisibleTyBinders</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC381" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstInvisibleTyBinders<span class="idiff left right">N</span></span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC382" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">empty_subst</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC383" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC384" class="line" lang="haskell"> <span class="n" style="color: #333;">empty_subst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkEmptyTCvSubst</span> <span class="p">(</span><span class="n" style="color: #333;">mkInScopeSet</span> <span class="p">(</span><span class="n" style="color: #333;">tyCoVarsOfType</span> <span class="n" style="color: #333;">ty</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">@@ -656,3 +656,43 @@ unify(</ tj // j />, </ t'j // j />) = subst</td>
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<pre style="margin: 0;"> <span id="LC656" class="line" lang="plaintext">subst(s) = subst(s')</span>
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<pre style="margin: 0;"> <span id="LC657" class="line" lang="plaintext">----------------------------------------- :: CompatCoincident</span>
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<pre style="margin: 0;"> <span id="LC658" class="line" lang="plaintext">no_conflict(C, </ sj // j />, ind1, ind2)</span>
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<pre style="margin: 0;">+<span id="LC659" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC660" class="line" lang="plaintext">defn |- axiom C ok :: :: lint_axiom :: 'Ax_'</span>
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<pre style="margin: 0;">+<span id="LC661" class="line" lang="plaintext"> {{ com Coercion axiom linting, \coderef{GHC/Core/Lint.hs}{lint\_axiom} }}</span>
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<pre style="margin: 0;">+<span id="LC662" class="line" lang="plaintext"> {{ tex \labeledjudge{axiom} [[C]] [[ok]] }}</span>
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<pre style="margin: 0;">+<span id="LC663" class="line" lang="plaintext">by</span>
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<pre style="margin: 0;">+<span id="LC664" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC665" class="line" lang="plaintext">isNewTyCon T</span>
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<pre style="margin: 0;">+<span id="LC666" class="line" lang="plaintext"></ Ri // i /> = tyConRoles T</span>
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<pre style="margin: 0;">+<span id="LC667" class="line" lang="plaintext"></ alphai_ki // i /> |-ty T </ alphai$ // i /> : k0</span>
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<pre style="margin: 0;">+<span id="LC668" class="line" lang="plaintext"></ alphai_ki // i /> |-ty s : k0</span>
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<pre style="margin: 0;">+<span id="LC669" class="line" lang="plaintext">------------------------------ :: Newtype</span>
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<pre style="margin: 0;">+<span id="LC670" class="line" lang="plaintext">|-axiom T_Rep forall </ alphai_ki RAi // i />. (</ alphai$ // i /> ~> s) ok</span>
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<pre style="margin: 0;">+<span id="LC671" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC672" class="line" lang="plaintext">isOpenTypeFamilyTyCon T</span>
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<pre style="margin: 0;">+<span id="LC673" class="line" lang="plaintext">T |-branch b ok</span>
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<pre style="margin: 0;">+<span id="LC674" class="line" lang="plaintext">------------------------------ :: OpenTypeFamily</span>
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<pre style="margin: 0;">+<span id="LC675" class="line" lang="plaintext">|-axiom T_Nom b ok</span>
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<pre style="margin: 0;">+<span id="LC677" class="line" lang="plaintext">isClosedTypeFamilyTyCon T</span>
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<pre style="margin: 0;">+<span id="LC678" class="line" lang="plaintext"></ T |-branch bi ok // i /></span>
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<pre style="margin: 0;">+<span id="LC679" class="line" lang="plaintext">--------------------------- :: ClosedTypeFamily</span>
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680
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<pre style="margin: 0;">+<span id="LC680" class="line" lang="plaintext">|-axiom T_Nom </ bi // i /> ok</span>
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681
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<pre style="margin: 0;">+<span id="LC681" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC682" class="line" lang="plaintext">isDataFamilyTyCon T</span>
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<pre style="margin: 0;">+<span id="LC683" class="line" lang="plaintext">T |-branch b ok</span>
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<pre style="margin: 0;">+<span id="LC684" class="line" lang="plaintext">--------------------------- :: DataFamily</span>
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<pre style="margin: 0;">+<span id="LC685" class="line" lang="plaintext">|-axiom T_Rep b ok</span>
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686
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<pre style="margin: 0;">+<span id="LC687" class="line" lang="plaintext">defn T |- branch b ok :: :: lint_family_branch :: 'Br_'</span>
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<pre style="margin: 0;">+<span id="LC688" class="line" lang="plaintext"> {{ com Type family branch linting, \coderef{GHC/Core/Lint.hs}{lint\_family\_branch} }}</span>
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<pre style="margin: 0;">+<span id="LC689" class="line" lang="plaintext"> {{ tex [[T]] \labeledjudge{branch} [[b]] [[ok]] }}</span>
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<pre style="margin: 0;">+<span id="LC690" class="line" lang="plaintext">by</span>
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<pre style="margin: 0;">+<span id="LC691" class="line" lang="plaintext"></span>
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692
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<pre style="margin: 0;">+<span id="LC692" class="line" lang="plaintext"></ Ri = Nom // i /></span>
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693
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<pre style="margin: 0;">+<span id="LC693" class="line" lang="plaintext"></ isTyFamFree tj // j /></span>
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<pre style="margin: 0;">+<span id="LC694" class="line" lang="plaintext">fv(</ tj // j />) = </ alphai$ // i /></span>
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<pre style="margin: 0;">+<span id="LC695" class="line" lang="plaintext"></ alphai_ki // i /> |-ty T </ tj // j /> : k0</span>
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<pre style="margin: 0;">+<span id="LC696" class="line" lang="plaintext"></ alphai_ki // i /> |-ty s : k0</span>
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<pre style="margin: 0;">+<span id="LC697" class="line" lang="plaintext">---------------------------------------------------------------- :: OK</span>
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<pre style="margin: 0;">+<span id="LC698" class="line" lang="plaintext">T |-branch forall </ alphai_ki RAi // i />. (</ tj // j /> ~> s) ok</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4bf18646acbb5a59ad8716aedc32acfe2ead0f58#560a2a2363bd7c0d01f90fdb07e153565ada8556"><strong>docs/core-spec/CoreSyn.ott</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">@@ -52,10 +52,10 @@ l :: 'Label_' ::= {{ com Labels for join points, also \coderef{GHC/Types/Var.hs}</td>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="plaintext">vars :: 'Vars_' ::= {{ com List of variables }}</span>
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="plaintext"> | </ ni // , // i /> :: :: List</span>
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<pre style="margin: 0;">-<span id="LC55" class="line" lang="plaintext"> | fv ( t ) :: M :: fv_t</span>
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<pre style="margin: 0;">-<span id="LC56" class="line" lang="plaintext"> {{ tex \textit{fv}([[t]]) }}</span>
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="plaintext"> | fv ( e ) :: M :: fv_e</span>
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="plaintext"> {{ tex \textit{fv}([[e]]) }}</span>
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<pre style="margin: 0;">+<span id="LC57" class="line" lang="plaintext"> | fv ( types ) :: M :: fv_types</span>
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<pre style="margin: 0;">+<span id="LC58" class="line" lang="plaintext"> {{ tex \textit{fv}([[types]]) }}</span>
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<pre style="margin: 0;"> <span id="LC59" class="line" lang="plaintext"> | empty :: M :: empty</span>
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="plaintext"> | vars1 \inter vars2 :: M :: intersection</span>
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61
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<pre style="margin: 0;"> <span id="LC61" class="line" lang="plaintext"> {{ tex [[vars1]] \cap [[vars2]] }}</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">@@ -197,7 +197,7 @@ R {{ tex \rho }} :: 'Role_' ::= {{ com Roles, \coderef{GHC/Core/Coercion/Axiom.h</td>
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197
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197
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<pre style="margin: 0;"> <span id="LC197" class="line" lang="plaintext"></span>
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198
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198
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<pre style="margin: 0;"> <span id="LC198" class="line" lang="plaintext">axBranch, b :: 'CoAxBranch_' ::= {{ com Axiom branches, \coderef{GHC/Core/TyCon.hs}{CoAxBranch} }}</span>
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199
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199
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<pre style="margin: 0;"> <span id="LC199" class="line" lang="plaintext"> | forall </ ni RAi // i /> . ( </ tj // j /> ~> s ) :: :: CoAxBranch {{ com \ctor{CoAxBranch}: Axiom branch }}</span>
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<pre style="margin: 0;">-<span id="LC200" class="line" lang="plaintext"> | ( </ axBranchi // i /> ) [ ind ] :: M :: lookup {{ com List lookup }}</span>
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<pre style="margin: 0;">+<span id="LC200" class="line" lang="plaintext"> | ( </ axBranchi // i /> ) [ ind ] <span class="idiff left right"> </span>:: M :: lookup {{ com List lookup }}</span>
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201
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<pre style="margin: 0;"> <span id="LC201" class="line" lang="plaintext"></span>
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202
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<pre style="margin: 0;"> <span id="LC202" class="line" lang="plaintext">mu {{ tex \mu }} :: 'CoAxiomRule_' ::= {{ com CoAxiomRules, \coderef{GHC/Core/Coercion/Axiom.hs}{CoAxiomRule} }}</span>
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203
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203
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<pre style="margin: 0;"> <span id="LC203" class="line" lang="plaintext"> | M ( I , role_list , R' ) :: :: CoAxiomRule {{ com Named rule, with parameter info }}</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">@@ -376,6 +376,10 @@ terminals :: 'terminals_' ::=</td>
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376
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<pre style="margin: 0;"> <span id="LC376" class="line" lang="plaintext"> | dataConTyCon :: :: dataConTyCon {{ tex \textsf{dataConTyCon} }}</span>
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377
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<pre style="margin: 0;"> <span id="LC377" class="line" lang="plaintext"> | dataConRepType :: :: dataConRepType {{ tex \textsf{dataConRepType} }}</span>
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378
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378
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<pre style="margin: 0;"> <span id="LC378" class="line" lang="plaintext"> | isNewTyCon :: :: isNewTyCon {{ tex \textsf{isNewTyCon} }}</span>
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379
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<pre style="margin: 0;">+<span id="LC379" class="line" lang="plaintext"> | isOpenTypeFamilyTyCon :: :: isOpenTypeFamilyTyCon {{ tex \textsf{isOpenTypeFamilyTyCon} }}</span>
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<pre style="margin: 0;">+<span id="LC380" class="line" lang="plaintext"> | isClosedTypeFamilyTyCon :: :: isClosedTypeFamilyTyCon {{ tex \textsf{isClosedTypeFamilyTyCon} }}</span>
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381
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<pre style="margin: 0;">+<span id="LC381" class="line" lang="plaintext"> | isDataFamilyTyCon :: :: isDataFamilyTyCon {{ tex \textsf{isDataFamilyTyCon} }}</span>
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382
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<pre style="margin: 0;">+<span id="LC382" class="line" lang="plaintext"> | isTyFamFree :: :: isTyFamFree {{ tex \textsf{isTyFamFree} }}</span>
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383
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<pre style="margin: 0;"> <span id="LC383" class="line" lang="plaintext"> | Constraint :: :: Constraint {{ tex \textsf{Constraint} }}</span>
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384
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<pre style="margin: 0;"> <span id="LC384" class="line" lang="plaintext"> | TYPE :: :: TYPE {{ tex \textsf{TYPE} }}</span>
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385
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<pre style="margin: 0;"> <span id="LC385" class="line" lang="plaintext"> | RuntimeRep :: :: RuntimeRep {{ tex \textsf{RuntimeRep} }}</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">@@ -449,6 +453,10 @@ formula :: 'formula_' ::=</td>
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449
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<pre style="margin: 0;"> <span id="LC453" class="line" lang="plaintext"> | G |- tylit lit : k :: :: lintTyLit</span>
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<pre style="margin: 0;"> <span id="LC454" class="line" lang="plaintext"> {{ tex [[G]] \labeledjudge{tylit} [[lit]] : [[k]] }}</span>
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<pre style="margin: 0;"> <span id="LC455" class="line" lang="plaintext"> | isNewTyCon T :: :: isNewTyCon</span>
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<pre style="margin: 0;">+<span id="LC456" class="line" lang="plaintext"> | isOpenTypeFamilyTyCon T :: :: isOpenTypeFamilyTyCon</span>
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<pre style="margin: 0;">+<span id="LC457" class="line" lang="plaintext"> | isClosedTypeFamilyTyCon T :: :: isClosedTypeFamilyTyCon</span>
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<pre style="margin: 0;">+<span id="LC458" class="line" lang="plaintext"> | isDataFamilyTyCon T :: :: isDataFamilyTyCon</span>
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<pre style="margin: 0;">+<span id="LC459" class="line" lang="plaintext"> | isTyFamFree t :: :: isTyFamFree</span>
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<pre style="margin: 0;"> <span id="LC460" class="line" lang="plaintext"> | k1 elt { </ ki // , // i /> } :: :: kind_elt</span>
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<pre style="margin: 0;"> <span id="LC461" class="line" lang="plaintext"> | e is_a_type :: :: is_a_type</span>
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<pre style="margin: 0;"> <span id="LC462" class="line" lang="plaintext"> {{ tex \exists \tau \text{ s.t.~} [[e]] = \tau }}</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">@@ -526,3 +534,4 @@ Expr_Coercion <= Subst_TmMapping</td>
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<pre style="margin: 0;"> <span id="LC534" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC535" class="line" lang="plaintext">Type_CastTy <= Var_IdOrTyVar</span>
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<pre style="margin: 0;"> <span id="LC536" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC537" class="line" lang="plaintext">Expr_Type <= Vars_fv_e</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4bf18646acbb5a59ad8716aedc32acfe2ead0f58#7dc5395d86b92c5a2b05aa2e9c13c1635f051da8"><strong>docs/core-spec/core-spec.mng</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">@@ -573,6 +573,37 @@ taking care to map identical type family applications to the same fresh variable</td>
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<pre style="margin: 0;"> <span id="LC573" class="line" lang="tex">The algorithm <span class="p">$</span><span class="o" style="font-weight: 600;">[[</span><span class="nb" style="color: #0086b3;">unify</span><span class="o" style="font-weight: 600;">]]</span><span class="p">$</span> is implemented in <span class="k" style="font-weight: 600;">\coderef</span><span class="p">{</span>GHC/Core/Unify.hs<span class="p">}{</span>tcUnifyTys<span class="p">}</span>.</span>
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<pre style="margin: 0;"> <span id="LC574" class="line" lang="tex">It performs a standard unification, returning a substitution upon success.</span>
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<pre style="margin: 0;"> <span id="LC575" class="line" lang="tex"></span>
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<pre style="margin: 0;">+<span id="LC576" class="line" lang="tex"><span class="k" style="font-weight: 600;">\subsection</span><span class="p">{</span>Axioms<span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC577" class="line" lang="tex"></span>
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<pre style="margin: 0;">+<span id="LC578" class="line" lang="tex">After type-checking the type and class declarations of a file, the axioms</span>
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<pre style="margin: 0;">+<span id="LC579" class="line" lang="tex">in the file are optionally linted. This is done from <span class="k" style="font-weight: 600;">\coderef</span><span class="p">{</span>GHC/Tc/Types.hs<span class="p">}{</span>lintGblEnv<span class="p">}</span>,</span>
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<pre style="margin: 0;">+<span id="LC580" class="line" lang="tex">which calls <span class="k" style="font-weight: 600;">\coderef</span><span class="p">{</span>GHC/Core/Lint.hs<span class="p">}{</span>lintAxioms<span class="p">}</span>. That function ensures</span>
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<pre style="margin: 0;">+<span id="LC581" class="line" lang="tex">the following judgement on each axiom:</span>
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582
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<pre style="margin: 0;">+<span id="LC582" class="line" lang="tex"></span>
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583
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<pre style="margin: 0;">+<span id="LC583" class="line" lang="tex"><span class="k" style="font-weight: 600;">\ottdefnlintXXaxiom</span><span class="p">{}</span></span>
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584
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<pre style="margin: 0;">+<span id="LC584" class="line" lang="tex"></span>
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585
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<pre style="margin: 0;">+<span id="LC585" class="line" lang="tex"><span class="k" style="font-weight: 600;">\ottdefnlintXXfamilyXXbranch</span><span class="p">{}</span></span>
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586
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<pre style="margin: 0;">+<span id="LC586" class="line" lang="tex"></span>
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<pre style="margin: 0;">+<span id="LC587" class="line" lang="tex">In addition to these checks, the linter will also check several other conditions:</span>
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<pre style="margin: 0;">+<span id="LC588" class="line" lang="tex"></span>
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<pre style="margin: 0;">+<span id="LC589" class="line" lang="tex"><span class="nt" style="color: #000080;">\begin{itemize}</span></span>
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<pre style="margin: 0;">+<span id="LC590" class="line" lang="tex"><span class="k" style="font-weight: 600;">\item</span> Every <span class="k" style="font-weight: 600;">\texttt</span><span class="p">{</span>CoAxBranch<span class="p">}</span> has a <span class="k" style="font-weight: 600;">\texttt</span><span class="p">{</span>cab<span class="k" style="font-weight: 600;">\_</span>cvs<span class="p">}</span> field. This is unused</span>
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<pre style="margin: 0;">+<span id="LC591" class="line" lang="tex">currently and should always be empty.</span>
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<pre style="margin: 0;">+<span id="LC592" class="line" lang="tex"><span class="k" style="font-weight: 600;">\item</span> Every <span class="k" style="font-weight: 600;">\texttt</span><span class="p">{</span>CoAxBranch<span class="p">}</span> has a <span class="k" style="font-weight: 600;">\texttt</span><span class="p">{</span>cab<span class="k" style="font-weight: 600;">\_</span>eta<span class="k" style="font-weight: 600;">\_</span>tvs<span class="p">}</span> field. This is used</span>
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<pre style="margin: 0;">+<span id="LC593" class="line" lang="tex">only for data family instances, but is not involved in type correctness. (It is</span>
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<pre style="margin: 0;">+<span id="LC594" class="line" lang="tex">used for pretty-printing.) The implemented linter checks to make sure this field</span>
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<pre style="margin: 0;">+<span id="LC595" class="line" lang="tex">is empty for axioms that are not associated with data family instances.</span>
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<pre style="margin: 0;">+<span id="LC596" class="line" lang="tex"><span class="k" style="font-weight: 600;">\item</span> Every <span class="k" style="font-weight: 600;">\texttt</span><span class="p">{</span>CoAxBranch<span class="p">}</span> has a <span class="k" style="font-weight: 600;">\texttt</span><span class="p">{</span>cab<span class="k" style="font-weight: 600;">\_</span>incomps<span class="p">}</span> field that stores</span>
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<pre style="margin: 0;">+<span id="LC597" class="line" lang="tex">a list of incompatible branches. The implemented linter checks that these</span>
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<pre style="margin: 0;">+<span id="LC598" class="line" lang="tex">branches are indeed incompatible with the current one.</span>
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599
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<pre style="margin: 0;">+<span id="LC599" class="line" lang="tex"><span class="k" style="font-weight: 600;">\item</span> The linter checks that newtypes are associated with exactly one axiom,</span>
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<pre style="margin: 0;">+<span id="LC600" class="line" lang="tex">as are closed type families.</span>
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601
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<pre style="margin: 0;">+<span id="LC601" class="line" lang="tex"><span class="k" style="font-weight: 600;">\item</span> The linter checks that all instances of the same open family are compatible.</span>
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602
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<pre style="margin: 0;">+<span id="LC602" class="line" lang="tex"><span class="nt" style="color: #000080;">\end{itemize}</span></span>
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603
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<pre style="margin: 0;">+<span id="LC603" class="line" lang="tex"></span>
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604
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<pre style="margin: 0;">+<span id="LC604" class="line" lang="tex">A nice summary of the required checks is in Section F.1 of the <span class="k" style="font-weight: 600;">\emph</span><span class="p">{</span>Safe Coercions<span class="p">}</span></span>
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605
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<pre style="margin: 0;">+<span id="LC605" class="line" lang="tex">paper (JFP'16).</span>
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<pre style="margin: 0;"> <span id="LC609" class="line" lang="tex"><span class="k" style="font-weight: 600;">\subsection</span><span class="p">{</span>Disclaimer<span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE GADTs, PolyKinds, DataKinds, 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;">Foo</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Exts</span></span>
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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.Kind</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;">type</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">F</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;">RuntimeRep</span></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="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">F</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">'LiftedRep</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">T</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="kt" style="color: #458; font-weight: 600;">F</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC14" 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 class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ASSERT error in HEAD</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4bf18646acbb5a59ad8716aedc32acfe2ead0f58#1b7bd6a45b74d0d2c4315fb30e7b443cb75d769c"><strong>testsuite/tests/polykinds/T18300.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T18300.hs:13:1: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Data instance has non-* return kind ‘TYPE (F Int)’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> • In the data instance declaration for ‘T’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4bf18646acbb5a59ad8716aedc32acfe2ead0f58#37bb83d0a916288b2296ba25cdbbef228eed6484"><strong>testsuite/tests/polykinds/all.T</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -219,3 +219,4 @@ test('T16902', normal, compile_fail, [''])</td>
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219
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219
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<pre style="margin: 0;"> <span id="LC219" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">CuskFam</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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220
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220
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<pre style="margin: 0;"> <span id="LC220" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17841</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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221
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221
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<pre style="margin: 0;"> <span id="LC221" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17963</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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222
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<pre style="margin: 0;">+<span id="LC222" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18300</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4bf18646acbb5a59ad8716aedc32acfe2ead0f58#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">@@ -685,7 +685,7 @@ test('UnliftedNewtypesUnifySig', normal, compile, [''])</td>
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685
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685
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<pre style="margin: 0;"> <span id="LC685" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">UnliftedNewtypesForall</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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686
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686
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<pre style="margin: 0;"> <span id="LC686" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">UnlifNewUnify</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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687
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687
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<pre style="margin: 0;"> <span id="LC687" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">UnliftedNewtypesLPFamily</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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688
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<pre style="margin: 0;">-<span id="LC688" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">UnliftedNewtypesDifficultUnification</span><span class="p">',</span> <span class="nv" style="color: #008080;"><span class="idiff left">when</span></span><span class="p"><span class="idiff">(</span></span><span class="nv" style="color: #008080;"><span class="idiff">compiler_debugged</span></span><span class="p"><span class="idiff">(),</span></span><span class="idiff"> </span><span class="nv" style="color: #008080;"><span class="idiff">expect_broken</span></span><span class="p"><span class="idiff">(</span></span><span class="mi" style="color: #099;"><span class="idiff">18300</span></span><span class="p"><span class="idiff right">))</span>,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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688
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<pre style="margin: 0;">+<span id="LC688" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">UnliftedNewtypesDifficultUnification</span><span class="p">',</span> <span class="nv" style="color: #008080;"><span class="idiff left right">normal</span></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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689
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689
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<pre style="margin: 0;"> <span id="LC689" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T16832</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">ghci_script</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">T16832.script</span><span class="p">'])</span></span>
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690
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690
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<pre style="margin: 0;"> <span id="LC690" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T16995</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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691
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691
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<pre style="margin: 0;"> <span id="LC691" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17007</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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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4bf18646acbb5a59ad8716aedc32acfe2ead0f58#abeee31addce4ae0b09edade85a4762fcf3e68e8"><strong>testsuite/tests/typecheck/should_fail/T18357.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 StandaloneKindSignatures, TypeFamilies, GADTs, DataKinds #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18357</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Kind</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">Star</span> <span class="kr" style="font-weight: 600;">where</span> <span class="kt" style="color: #458; font-weight: 600;">Star</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="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="kt" style="color: #458; font-weight: 600;">W</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Star</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">W</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="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="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;">W</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4bf18646acbb5a59ad8716aedc32acfe2ead0f58#c2f90ec41cd7d4de2db4fb0494db0276b8b7f85e"><strong>testsuite/tests/typecheck/should_fail/T18357.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T18357.hs:13:3: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Data constructor ‘MkT’ returns type ‘W’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> instead of an instance of its parent type ‘T’</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> • In the definition of data constructor ‘MkT’</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/4bf18646acbb5a59ad8716aedc32acfe2ead0f58#37562d516c72bcca7717480a73a59344d0fd4b0a"><strong>testsuite/tests/typecheck/should_fail/T18357a.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 PolyKinds, UnliftedNewtypes, StandaloneKindSignatures, TypeFamilies, GADTs, DataKinds #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18357a</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;">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="n" style="color: #333;">r</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">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="LC10" class="line" lang="haskell"></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4bf18646acbb5a59ad8716aedc32acfe2ead0f58#57978526cc778542f2ca795c47edc2ae6644234e"><strong>testsuite/tests/typecheck/should_fail/T18357a.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">T18357a.hs:9:10: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Couldn't match kind ‘r’ with ‘'LiftedRep’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> Expected a type, but ‘Int’ has kind ‘*’</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> • In the type ‘Int’</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> In the definition of data constructor ‘MkT’</span>
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<pre style="margin: 0;">+<span id="LC7" 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/4bf18646acbb5a59ad8716aedc32acfe2ead0f58#156cc2660393f1d1fc85c7add1ed2dbebe4ed154"><strong>testsuite/tests/typecheck/should_fail/T18357b.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE UnliftedNewtypes, StandaloneKindSignatures, TypeFamilies, GADTs, DataKinds #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18357b</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Kind</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">Star</span> <span class="kr" style="font-weight: 600;">where</span> <span class="kt" style="color: #458; font-weight: 600;">Star</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="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="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="p">(</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;">Star</span><span class="p">)</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="c1" style="color: #998; font-style: italic;">-- The error message is pretty terrible</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- but it probably nevery happens in practice</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4bf18646acbb5a59ad8716aedc32acfe2ead0f58#fb000425d2ea4fbc52dd7bccf11fd592c30722e2"><strong>testsuite/tests/typecheck/should_fail/T18357b.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">T18357b.hs:10:3: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Data constructor ‘MkT’ returns type ‘T’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> instead of an instance of its parent type ‘T’</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> • In the definition of data constructor ‘MkT’</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/4bf18646acbb5a59ad8716aedc32acfe2ead0f58#b9e86d897a62509b0114d81d5e736630d6f68f43"><strong>testsuite/tests/typecheck/should_fail/all.T</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="575" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -575,3 +575,6 @@ test('ExplicitSpecificity7', normal, compile_fail, [''])</td>
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575
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<pre style="margin: 0;"> <span id="LC575" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">ExplicitSpecificity8</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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576
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576
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<pre style="margin: 0;"> <span id="LC576" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">ExplicitSpecificity9</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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577
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577
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<pre style="margin: 0;"> <span id="LC577" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">ExplicitSpecificity10</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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578
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<pre style="margin: 0;">+<span id="LC578" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18357</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">+<span id="LC579" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18357a</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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580
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<pre style="margin: 0;">+<span id="LC580" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18357b</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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