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<h3>
Richard Eisenberg pushed to branch wip/T18300
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/559dd456b071efbd2b5aff9492351a7fba237a54">559dd456</a></strong>
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<span>by Richard Eisenberg</span>
<i>at 2020-06-16T17:49:14+01:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add proper axiom linter
Also, other small wibbles from reviewing !3507
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<h4>14 changed files:</h4>
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<a href="#f10ed7a2470454dfdd8691a08beba67d8b78ee70">
compiler/GHC/Core/Coercion/Axiom.hs
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<a href="#6fcf64907fb5bdd93082d2d1eb94e4566e735865">
compiler/GHC/Core/DataCon.hs
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<a href="#91648438362e5a35363d2bb7abb04016dedd7d7e">
compiler/GHC/Core/FamInstEnv.hs
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<a href="#36a42448a83a9d1f6df8475f03ead2eed199dd8e">
compiler/GHC/Core/Lint.hs
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<a href="#4aad0050db1a8a20db8bbca149111de99cb299c9">
compiler/GHC/Core/TyCon.hs
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<a href="#9355bef855426caf5f526925edf351b20f9a86c4">
compiler/GHC/Tc/Gen/HsType.hs
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<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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<a href="#83d23a46bb6cdc8b1edc16f1fd2c8f5c53e2c9ca">
compiler/GHC/Tc/TyCl.hs
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<a href="#7dcf5b567a6cd3c9d98cf8d57323fbca1b1536e9">
compiler/GHC/Tc/Types.hs
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<a href="#f740374ad9d1ce333c9d2992b2feda632e24371f">
docs/core-spec/CoreLint.ott
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<a href="#560a2a2363bd7c0d01f90fdb07e153565ada8556">
docs/core-spec/CoreSyn.ott
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<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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<h4>Changes:</h4>
<li id="f10ed7a2470454dfdd8691a08beba67d8b78ee70">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/559dd456b071efbd2b5aff9492351a7fba237a54#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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<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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<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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<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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<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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<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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<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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<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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<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>
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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">@@ -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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<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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<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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<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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239
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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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240
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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/559dd456b071efbd2b5aff9492351a7fba237a54#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">@@ -1514,4 +1514,3 @@ splitDataProductType_maybe ty</td>
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1514
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<pre style="margin: 0;"> <span id="LC1514" 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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1515
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1515
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<pre style="margin: 0;"> <span id="LC1515" 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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1516
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1516
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<pre style="margin: 0;"> <span id="LC1516" 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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1517
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<pre style="margin: 0;">-<span id="LC1517" class="line" lang="haskell"></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/559dd456b071efbd2b5aff9492351a7fba237a54#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">@@ -647,13 +647,13 @@ mkCoAxBranch :: [TyVar] -- original, possibly stale, tyvars</td>
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647
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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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648
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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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650
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<pre style="margin: 0;">-<span id="LC650" class="line" lang="haskell"> <span class="idiff left right"> </span><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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651
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<pre style="margin: 0;">-<span id="LC651" class="line" lang="haskell"> <span class="idiff left right"> </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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652
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<pre style="margin: 0;">-<span id="LC652" class="line" lang="haskell"> <span class="idiff left right"> </span><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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653
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<pre style="margin: 0;">-<span id="LC653" class="line" lang="haskell"> <span class="idiff left right"> </span><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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<pre style="margin: 0;">-<span id="LC654" class="line" lang="haskell"> <span class="idiff left right"> </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;">tidyType</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;">-<span id="LC655" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="p">,</span> <span class="n" style="color: #333;">cab_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">loc</span></span>
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<pre style="margin: 0;">-<span id="LC656" class="line" lang="haskell"> <span class="idiff left right"> </span><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;">placeHolderIncomps</span> <span class="p">}</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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<pre style="margin: 0;">+<span id="LC653" 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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<pre style="margin: 0;">+<span id="LC654" 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;">tidyType</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;">+<span id="LC655" 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="n" style="color: #333;">loc</span></span>
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<pre style="margin: 0;">+<span id="LC656" 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;">placeHolderIncomps</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC657" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC658" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">env1</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;">tidyVarBndrs</span> <span class="n" style="color: #333;">init_tidy_env</span> <span class="n" style="color: #333;">tvs</span></span>
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<pre style="margin: 0;"> <span id="LC659" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">env2</span><span class="p">,</span> <span class="n" style="color: #333;">eta_tvs'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tidyVarBndrs</span> <span class="n" style="color: #333;">env1</span> <span class="n" style="color: #333;">eta_tvs</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/559dd456b071efbd2b5aff9492351a7fba237a54#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">@@ -8,12 +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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<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 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 ScopedTypeVariables, DeriveFunctor<span class="idiff left right">, MultiWayIf</span> #-}</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="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;">lintAxiom</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;">lintAxiom<span class="idiff left right">s</span></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">@@ -34,7 +34,7 @@ import GHC.Data.Bag</td>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Literal</span></span>
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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.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="LC37" 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="LC38" 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="LC39" 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="LC40" 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">@@ -51,9 +51,10 @@ import GHC.Types.RepType</td>
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<pre style="margin: 0;"> <span id="LC51" 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="LC52" 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="LC53" 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="LC54" 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="LC54" 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="LC55" 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="LC56" 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="LC57" 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="LC58" 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="LC59" 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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60
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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.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">@@ -71,7 +72,7 @@ import GHC.Driver.Session</td>
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71
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72
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<pre style="margin: 0;"> <span id="LC72" 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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72
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<pre style="margin: 0;"> <span id="LC73" 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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73
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74
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<pre style="margin: 0;"> <span id="LC74" 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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74
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<pre style="margin: 0;">-<span id="LC74" 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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75
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<pre style="margin: 0;">+<span id="LC75" 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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75
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76
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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;">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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76
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77
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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;">Data.Maybe</span></span>
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78
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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.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">@@ -1490,33 +1491,6 @@ lintIdBndr top_lvl bind_site id thing_inside</td>
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1490
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1491
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<pre style="margin: 0;"> <span id="LC1491" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">%************************************************************************</span></span>
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1491
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1492
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<pre style="margin: 0;"> <span id="LC1492" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1493
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<pre style="margin: 0;"> <span id="LC1493" class="line" lang="haskell"></span>
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1493
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<pre style="margin: 0;">-<span id="LC1493" class="line" lang="haskell"><span class="n" style="color: #333;">lintAxiom</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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1494
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<pre style="margin: 0;">-<span id="LC1494" class="line" lang="haskell"> <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>
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1495
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<pre style="margin: 0;">-<span id="LC1495" 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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1496
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<pre style="margin: 0;">-<span id="LC1496" class="line" lang="haskell"><span class="n" style="color: #333;">lintAxiom</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">axiom</span></span>
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1497
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<pre style="margin: 0;">-<span id="LC1497" 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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1498
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<pre style="margin: 0;">-<span id="LC1498" 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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1499
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<pre style="margin: 0;">-<span id="LC1499" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1500
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<pre style="margin: 0;">-<span id="LC1500" 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="n" style="color: #333;">defaultLintFlags</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">$</span></span>
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1501
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<pre style="margin: 0;">-<span id="LC1501" class="line" lang="haskell"> <span class="n" style="color: #333;">lint_axiom</span> <span class="n" style="color: #333;">axiom</span></span>
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<pre style="margin: 0;">-<span id="LC1502" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1503" 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;">Unbranched</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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1504
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<pre style="margin: 0;">-<span id="LC1504" 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;">fam_tc</span> <span class="p">})</span></span>
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1505
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<pre style="margin: 0;">-<span id="LC1505" 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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1506
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<pre style="margin: 0;">-<span id="LC1506" 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;">fam_tc</span> <span class="n" style="color: #333;">lhs_args</span></span>
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1507
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<pre style="margin: 0;">-<span id="LC1507" 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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<pre style="margin: 0;">-<span id="LC1508" 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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<pre style="margin: 0;">-<span id="LC1509" 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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1510
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<pre style="margin: 0;">-<span id="LC1510" 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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1511
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<pre style="margin: 0;">-<span id="LC1511" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">checkL</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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1512
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<pre style="margin: 0;">-<span id="LC1512" 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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1513
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<pre style="margin: 0;">-<span id="LC1513" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ax</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"lhs:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">lhs</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">lhs_kind</span></span>
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<pre style="margin: 0;">-<span id="LC1514" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"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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1515
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<pre style="margin: 0;">-<span id="LC1515" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1516
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<pre style="margin: 0;">-<span id="LC1516" 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 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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1517
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<pre style="margin: 0;">-<span id="LC1517" 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 class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">coAxiomSingleBranch</span> <span class="n" style="color: #333;">ax</span></span>
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1518
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<pre style="margin: 0;">-<span id="LC1518" class="line" lang="haskell"></span>
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1519
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<pre style="margin: 0;">-<span id="LC1519" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1494" 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="LC1495" 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="LC1496" 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="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2249,6 +2223,175 @@ lintCoercion (HoleCo h)</td>
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<pre style="margin: 0;"> <span id="LC2223" 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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2250
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<pre style="margin: 0;"> <span id="LC2224" 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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2251
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2225
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<pre style="margin: 0;"> <span id="LC2225" class="line" lang="haskell"></span>
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2226
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<pre style="margin: 0;">+<span id="LC2226" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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2227
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<pre style="margin: 0;">+<span id="LC2227" 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="LC2228" 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="LC2229" 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="LC2230" 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="LC2231" 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="LC2232" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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2233
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<pre style="margin: 0;">+<span id="LC2233" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2234" 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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2235
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<pre style="margin: 0;">+<span id="LC2235" 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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2236
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<pre style="margin: 0;">+<span id="LC2236" 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="LC2237" 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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2238
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<pre style="margin: 0;">+<span id="LC2238" 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="n" style="color: #333;">defaultLintFlags</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="LC2239" 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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2240
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<pre style="margin: 0;">+<span id="LC2240" 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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2241
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<pre style="margin: 0;">+<span id="LC2241" 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="LC2242" class="line" lang="haskell"></span>
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2243
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<pre style="margin: 0;">+<span id="LC2243" 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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2244
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<pre style="margin: 0;">+<span id="LC2244" 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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2245
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<pre style="margin: 0;">+<span id="LC2245" 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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2246
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<pre style="margin: 0;">+<span id="LC2246" 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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2247
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<pre style="margin: 0;">+<span id="LC2247" 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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2248
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<pre style="margin: 0;">+<span id="LC2248" 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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2249
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<pre style="margin: 0;">+<span id="LC2249" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2250
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<pre style="margin: 0;">+<span id="LC2250" 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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2251
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<pre style="margin: 0;">+<span id="LC2251" class="line" lang="haskell"></span>
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2252
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<pre style="margin: 0;">+<span id="LC2252" class="line" lang="haskell"> <span class="n" style="color: #333;">extra_checks</span></span>
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2253
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<pre style="margin: 0;">+<span id="LC2253" 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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2254
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<pre style="margin: 0;">+<span id="LC2254" 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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2255
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<pre style="margin: 0;">+<span id="LC2255" 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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2256
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<pre style="margin: 0;">+<span id="LC2256" 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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2257
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<pre style="margin: 0;">+<span id="LC2257" 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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2258
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<pre style="margin: 0;">+<span id="LC2258" 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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2259
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<pre style="margin: 0;">+<span id="LC2259" 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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2260
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<pre style="margin: 0;">+<span id="LC2260" 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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2261
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<pre style="margin: 0;">+<span id="LC2261" 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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2262
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<pre style="margin: 0;">+<span id="LC2262" 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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<pre style="margin: 0;">+<span id="LC2263" 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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2264
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<pre style="margin: 0;">+<span id="LC2264" 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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2265
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<pre style="margin: 0;">+<span id="LC2265" 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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2266
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<pre style="margin: 0;">+<span id="LC2266" 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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2267
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<pre style="margin: 0;">+<span id="LC2267" 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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2268
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<pre style="margin: 0;">+<span id="LC2268" 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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2269
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<pre style="margin: 0;">+<span id="LC2269" 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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2270
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<pre style="margin: 0;">+<span id="LC2270" 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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2271
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<pre style="margin: 0;">+<span id="LC2271" 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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2272
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<pre style="margin: 0;">+<span id="LC2272" 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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2273
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<pre style="margin: 0;">+<span id="LC2273" 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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2274
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<pre style="margin: 0;">+<span id="LC2274" 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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2275
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<pre style="margin: 0;">+<span id="LC2275" 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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2276
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<pre style="margin: 0;">+<span id="LC2276" 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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2277
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<pre style="margin: 0;">+<span id="LC2277" 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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2278
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<pre style="margin: 0;">+<span id="LC2278" 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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2279
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<pre style="margin: 0;">+<span id="LC2279" 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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2280
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<pre style="margin: 0;">+<span id="LC2280" 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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2281
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<pre style="margin: 0;">+<span id="LC2281" 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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2282
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<pre style="margin: 0;">+<span id="LC2282" 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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2283
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<pre style="margin: 0;">+<span id="LC2283" 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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2284
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<pre style="margin: 0;">+<span id="LC2284" 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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2285
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<pre style="margin: 0;">+<span id="LC2285" class="line" lang="haskell"> <span class="p">}</span></span>
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2286
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<pre style="margin: 0;">+<span id="LC2286" class="line" lang="haskell"></span>
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2287
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<pre style="margin: 0;">+<span id="LC2287" 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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2288
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<pre style="margin: 0;">+<span id="LC2288" 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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2289
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<pre style="margin: 0;">+<span id="LC2289" 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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2290
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<pre style="margin: 0;">+<span id="LC2290" 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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2291
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<pre style="margin: 0;">+<span id="LC2291" class="line" lang="haskell"></span>
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2292
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<pre style="margin: 0;">+<span id="LC2292" 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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2293
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<pre style="margin: 0;">+<span id="LC2293" 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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2294
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<pre style="margin: 0;">+<span id="LC2294" 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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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="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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2297
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<pre style="margin: 0;">+<span id="LC2297" 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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2298
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<pre style="margin: 0;">+<span id="LC2298" class="line" lang="haskell"></span>
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2299
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<pre style="margin: 0;">+<span id="LC2299" 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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2300
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<pre style="margin: 0;">+<span id="LC2300" class="line" lang="haskell"></span>
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2301
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<pre style="margin: 0;">+<span id="LC2301" 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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2302
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<pre style="margin: 0;">+<span id="LC2302" 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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2303
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<pre style="margin: 0;">+<span id="LC2303" class="line" lang="haskell"></span>
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2304
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<pre style="margin: 0;">+<span id="LC2304" 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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2305
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<pre style="margin: 0;">+<span id="LC2305" 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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2306
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<pre style="margin: 0;">+<span id="LC2306" 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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2307
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<pre style="margin: 0;">+<span id="LC2307" 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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2308
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<pre style="margin: 0;">+<span id="LC2308" 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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2309
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<pre style="margin: 0;">+<span id="LC2309" 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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2310
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<pre style="margin: 0;">+<span id="LC2310" 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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2311
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<pre style="margin: 0;">+<span id="LC2311" 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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2312
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<pre style="margin: 0;">+<span id="LC2312" 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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2313
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<pre style="margin: 0;">+<span id="LC2313" 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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2314
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<pre style="margin: 0;">+<span id="LC2314" 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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2315
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<pre style="margin: 0;">+<span id="LC2315" 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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2316
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<pre style="margin: 0;">+<span id="LC2316" 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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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="c1" style="color: #998; font-style: italic;">-- these checks do not apply to newtype axioms</span></span>
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2319
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<pre style="margin: 0;">+<span id="LC2319" 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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2320
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<pre style="margin: 0;">+<span id="LC2320" 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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2321
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<pre style="margin: 0;">+<span id="LC2321" 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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2322
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<pre style="margin: 0;">+<span id="LC2322" 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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2323
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<pre style="margin: 0;">+<span id="LC2323" 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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2324
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<pre style="margin: 0;">+<span id="LC2324" 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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2325
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<pre style="margin: 0;">+<span id="LC2325" 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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2326
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<pre style="margin: 0;">+<span id="LC2326" 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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2327
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<pre style="margin: 0;">+<span id="LC2327" 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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2328
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<pre style="margin: 0;">+<span id="LC2328" 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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2329
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<pre style="margin: 0;">+<span id="LC2329" 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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2330
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<pre style="margin: 0;">+<span id="LC2330" 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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2331
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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;">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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2332
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<pre style="margin: 0;">+<span id="LC2332" 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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2333
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<pre style="margin: 0;">+<span id="LC2333" 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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2334
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<pre style="margin: 0;">+<span id="LC2334" 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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2335
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<pre style="margin: 0;">+<span id="LC2335" 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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2336
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<pre style="margin: 0;">+<span id="LC2336" 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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2337
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<pre style="margin: 0;">+<span id="LC2337" 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;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">br'</span> <span class="o" style="font-weight: 600;">-></span></span>
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2338
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<pre style="margin: 0;">+<span id="LC2338" class="line" lang="haskell"> <span class="n" style="color: #333;">lintL</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">compatible_branches</span> <span class="n" style="color: #333;">br</span> <span class="n" style="color: #333;">br'</span><span class="p">))</span> <span class="o" style="font-weight: 600;">$</span></span>
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2339
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<pre style="margin: 0;">+<span id="LC2339" 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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2340
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<pre style="margin: 0;">+<span id="LC2340" class="line" lang="haskell"></span>
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2341
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<pre style="margin: 0;">+<span id="LC2341" 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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2342
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<pre style="margin: 0;">+<span id="LC2342" 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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2343
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<pre style="margin: 0;">+<span id="LC2343" 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="LC2344" 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="LC2345" 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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<pre style="margin: 0;">+<span id="LC2346" 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="LC2347" 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="LC2348" 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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<pre style="margin: 0;">+<span id="LC2349" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC2350" 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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<pre style="margin: 0;">+<span id="LC2351" 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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<pre style="margin: 0;">+<span id="LC2352" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2353" 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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<pre style="margin: 0;">+<span id="LC2354" 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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2355
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<pre style="margin: 0;">+<span id="LC2355" 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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2356
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<pre style="margin: 0;">+<span id="LC2356" 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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2357
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<pre style="margin: 0;">+<span id="LC2357" 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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2358
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<pre style="margin: 0;">+<span id="LC2358" 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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2359
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<pre style="margin: 0;">+<span id="LC2359" 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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2360
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<pre style="margin: 0;">+<span id="LC2360" 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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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="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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2362
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<pre style="margin: 0;">+<span id="LC2362" 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="LC2363" 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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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;">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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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;">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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2366
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<pre style="margin: 0;">+<span id="LC2366" 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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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;">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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2368
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<pre style="margin: 0;">+<span id="LC2368" 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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2369
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<pre style="margin: 0;">+<span id="LC2369" 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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2370
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<pre style="margin: 0;">+<span id="LC2370" class="line" lang="haskell"></span>
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2371
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<pre style="margin: 0;">+<span id="LC2371" 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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2372
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<pre style="margin: 0;">+<span id="LC2372" 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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2373
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<pre style="margin: 0;">+<span id="LC2373" 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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2374
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<pre style="margin: 0;">+<span id="LC2374" class="line" lang="haskell"></span>
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2375
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<pre style="margin: 0;">+<span id="LC2375" 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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2376
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<pre style="margin: 0;">+<span id="LC2376" 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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2377
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<pre style="margin: 0;">+<span id="LC2377" 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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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;">cab_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lhs1</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;">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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2380
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<pre style="margin: 0;">+<span id="LC2380" 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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2381
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<pre style="margin: 0;">+<span id="LC2381" 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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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;">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="LC2383" 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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2384
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<pre style="margin: 0;">+<span id="LC2384" 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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2385
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<pre style="margin: 0;">+<span id="LC2385" 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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2386
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<pre style="margin: 0;">+<span id="LC2386" 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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2387
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<pre style="margin: 0;">+<span id="LC2387" 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="LC2388" 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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2389
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<pre style="margin: 0;">+<span id="LC2389" 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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2390
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<pre style="margin: 0;">+<span id="LC2390" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span></span>
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2391
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<pre style="margin: 0;">+<span id="LC2391" 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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2392
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<pre style="margin: 0;">+<span id="LC2392" 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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2393
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<pre style="margin: 0;">+<span id="LC2393" 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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2394
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<pre style="margin: 0;">+<span id="LC2394" 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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2395
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<pre style="margin: 0;"> <span id="LC2395" class="line" lang="haskell"></span>
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2253
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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;">{-</span></span>
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2254
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2397
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<pre style="margin: 0;"> <span id="LC2397" 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">@@ -2422,6 +2565,7 @@ data LintLocInfo</td>
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2565
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<pre style="margin: 0;"> <span id="LC2565" 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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2423
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<pre style="margin: 0;"> <span id="LC2566" 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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2424
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<pre style="margin: 0;"> <span id="LC2567" 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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2568
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<pre style="margin: 0;">+<span id="LC2568" 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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2425
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<pre style="margin: 0;"> <span id="LC2569" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2570" 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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2571
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<pre style="margin: 0;"> <span id="LC2571" 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">@@ -2664,6 +2808,34 @@ dumpLoc (InType ty)</td>
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2664
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2808
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<pre style="margin: 0;"> <span id="LC2808" 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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2665
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2809
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<pre style="margin: 0;"> <span id="LC2809" 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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2666
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2810
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<pre style="margin: 0;"> <span id="LC2810" 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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2811
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<pre style="margin: 0;">+<span id="LC2811" 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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2812
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<pre style="margin: 0;">+<span id="LC2812" 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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<td class="diff-line-num new new_line" data-linenumber="2813" 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">
2813
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<pre style="margin: 0;">+<span id="LC2813" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2814
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<pre style="margin: 0;">+<span id="LC2814" 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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2815
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<pre style="margin: 0;">+<span id="LC2815" 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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2816
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<pre style="margin: 0;">+<span id="LC2816" 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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2817
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<pre style="margin: 0;">+<span id="LC2817" 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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2818
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<pre style="margin: 0;">+<span id="LC2818" 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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2819
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<pre style="margin: 0;">+<span id="LC2819" class="line" lang="haskell"></span>
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2820
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<pre style="margin: 0;">+<span id="LC2820" class="line" lang="haskell"> <span class="n" style="color: #333;">pp_ax</span></span>
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2821
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<pre style="margin: 0;">+<span id="LC2821" 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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2822
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<pre style="margin: 0;">+<span id="LC2822" 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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2823
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<pre style="margin: 0;">+<span id="LC2823" class="line" lang="haskell"></span>
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2824
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<pre style="margin: 0;">+<span id="LC2824" 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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2825
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<pre style="margin: 0;">+<span id="LC2825" 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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2826
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<pre style="margin: 0;">+<span id="LC2826" class="line" lang="haskell"></span>
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2827
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<pre style="margin: 0;">+<span id="LC2827" 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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<td class="diff-line-num new new_line" data-linenumber="2828" 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">
2828
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<pre style="margin: 0;">+<span id="LC2828" 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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2829
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<pre style="margin: 0;">+<span id="LC2829" 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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2830
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<pre style="margin: 0;">+<span id="LC2830" 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="2831" 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">
2831
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<pre style="margin: 0;">+<span id="LC2831" 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="2832" 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">
2832
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<pre style="margin: 0;">+<span id="LC2832" 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="2833" 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">
2833
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<pre style="margin: 0;">+<span id="LC2833" 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="2834" 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">
2834
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<pre style="margin: 0;">+<span id="LC2834" 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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2835
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<pre style="margin: 0;">+<span id="LC2835" class="line" lang="haskell"></span>
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2836
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<pre style="margin: 0;">+<span id="LC2836" 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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<td class="diff-line-num new new_line" data-linenumber="2837" 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">
2837
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<pre style="margin: 0;">+<span id="LC2837" 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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2838
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<pre style="margin: 0;">+<span id="LC2838" 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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2667
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2839
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<pre style="margin: 0;"> <span id="LC2839" class="line" lang="haskell"></span>
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2668
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2840
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<pre style="margin: 0;"> <span id="LC2840" 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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2669
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2841
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<pre style="margin: 0;"> <span id="LC2841" 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/559dd456b071efbd2b5aff9492351a7fba237a54#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">@@ -1257,34 +1257,21 @@ example,</td>
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1257
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1257
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<pre style="margin: 0;"> <span id="LC1257" class="line" lang="haskell"></span>
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1258
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1258
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<pre style="margin: 0;"> <span id="LC1258" 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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1259
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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;">the NewTyCon for T will contain nt_co = CoT where CoT <span class="idiff left right">t : T t ~ t -> t</span>.</span></span>
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<pre style="margin: 0;">+<span id="LC1260" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the NewTyCon for T will contain nt_co = CoT where CoT <span class="idiff left right">:: forall a. T a ~ a -> a</span>.</span></span>
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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;">In the case that the right hand side is a type application</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;">ending with the same type variables as the left hand side, we</span></span>
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1264
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<pre style="margin: 0;">-<span id="LC1264" 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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1265
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<pre style="margin: 0;">-<span id="LC1265" class="line" lang="haskell"></span>
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1266
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<pre style="margin: 0;">-<span id="LC1266" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> newtype S a = MkT [a]</span></span>
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1267
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<pre style="margin: 0;">-<span id="LC1267" class="line" lang="haskell"></span>
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1268
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<pre style="margin: 0;">-<span id="LC1268" 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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1269
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<pre style="margin: 0;">-<span id="LC1269" 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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1270
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<pre style="margin: 0;">-<span id="LC1270" class="line" lang="haskell"></span>
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1271
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<pre style="margin: 0;">-<span id="LC1271" 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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1272
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<pre style="margin: 0;">-<span id="LC1272" 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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1273
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<pre style="margin: 0;">-<span id="LC1273" 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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1274
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<pre style="margin: 0;">-<span id="LC1274" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> CoT @ s</span></span>
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1275
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<pre style="margin: 0;">-<span id="LC1275" 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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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;">We might also eta-contract the axiom: see Note [Newtype eta].</span></span>
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1276
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1263
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<pre style="margin: 0;"> <span id="LC1263" class="line" lang="haskell"></span>
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1277
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1264
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<pre style="margin: 0;"> <span id="LC1264" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Newtype eta]</span></span>
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1278
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1265
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<pre style="margin: 0;"> <span id="LC1265" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~</span></span>
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1279
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1266
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<pre style="margin: 0;"> <span id="LC1266" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider</span></span>
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1280
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1267
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<pre style="margin: 0;"> <span id="LC1267" 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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1281
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<pre style="margin: 0;">-<span id="LC1281" 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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1268
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<pre style="margin: 0;">+<span id="LC1268" 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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1282
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<pre style="margin: 0;"> <span id="LC1269" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Monad Parser</span></span>
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1270
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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 IO</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;">which we need to make the derived instance for Monad Parser.</span></span>
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1272
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<pre style="margin: 0;"> <span id="LC1272" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1273" 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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1287
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<pre style="margin: 0;">-<span id="LC1287" 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="LC1274" 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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1288
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<pre style="margin: 0;"> <span id="LC1275" 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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1289
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1276
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<pre style="margin: 0;"> <span id="LC1276" 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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1277
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<pre style="margin: 0;"> <span id="LC1277" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/559dd456b071efbd2b5aff9492351a7fba237a54#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">@@ -3235,7 +3235,8 @@ data DataSort</td>
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<pre style="margin: 0;"> <span id="LC3235" 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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<pre style="margin: 0;"> <span id="LC3236" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;"> <span id="LC3237" 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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<pre style="margin: 0;">-<span id="LC3238" 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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<pre style="margin: 0;">+<span id="LC3238" 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="LC3239" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC3240" 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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<pre style="margin: 0;"> <span id="LC3241" 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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<pre style="margin: 0;"> <span id="LC3242" 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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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/559dd456b071efbd2b5aff9492351a7fba237a54#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">@@ -162,27 +162,13 @@ addressed yet.</td>
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<pre style="margin: 0;"> <span id="LC162" 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="LC163" 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="LC164" 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="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="c1" style="color: #998; font-style: italic;">-- Use lintAxiom to check that the axiom is well formed</span></span>
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<pre style="margin: 0;">-<span id="LC166" 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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<pre style="margin: 0;">-<span id="LC167" 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;">$</span> <span class="c1" style="color: #998; font-style: italic;">-- Don't lint when there are errors, because</span></span>
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<pre style="margin: 0;">-<span id="LC168" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- errors might mean TcTyCons.</span></span>
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<pre style="margin: 0;">-<span id="LC169" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Recover from validity error] in GHC.Tc.TyCl</span></span>
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<pre style="margin: 0;">-<span id="LC170" class="line" lang="haskell"> <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">gopt</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_DoCoreLinting</span> <span class="n" style="color: #333;">dflags</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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171
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<pre style="margin: 0;">-<span id="LC171" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lintAxiom</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">axiom</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC172" 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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<pre style="margin: 0;">-<span id="LC173" 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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<pre style="margin: 0;">-<span id="LC174" 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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<pre style="margin: 0;">-<span id="LC175" 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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<pre style="margin: 0;">-<span id="LC176" 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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<pre style="margin: 0;">-<span id="LC177" 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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<pre style="margin: 0;">-<span id="LC178" 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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<pre style="margin: 0;">-<span id="LC179" 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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<pre style="margin: 0;">-<span id="LC180" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC181" 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="LC182" 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;">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="LC165" 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="LC166" 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="LC167" 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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183
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168
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<pre style="margin: 0;"> <span id="LC168" 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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184
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169
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<pre style="margin: 0;"> <span id="LC169" 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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185
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170
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<pre style="margin: 0;"> <span id="LC170" 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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171
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<pre style="margin: 0;">+<span id="LC171" class="line" lang="haskell"></span>
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186
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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;">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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187
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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_flavor</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">flavor</span></span>
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188
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174
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<pre style="margin: 0;"> <span id="LC174" 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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<li id="e65390fa5a32c453a81a1c9a3e1c4464d155ca4a">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/559dd456b071efbd2b5aff9492351a7fba237a54#e65390fa5a32c453a81a1c9a3e1c4464d155ca4a"><strong>compiler/GHC/Tc/Module.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="268" 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="268" 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">@@ -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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269
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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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270
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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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272
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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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274
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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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271
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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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<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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<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="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1803,29 +1803,11 @@ DT1 Where this applies: Only GADT syntax for data/newtype/instance declarations</td>
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1803
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<pre style="margin: 0;"> <span id="LC1803" 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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1804
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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;"> syntax.</span></span>
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1805
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<pre style="margin: 0;"> <span id="LC1805" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1806" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">DT2 Where these kinds come from: Return kinds are processed through several</span></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;"> different code paths:</span></span>
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<pre style="margin: 0;">-<span id="LC1808" class="line" lang="haskell"></span>
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1809
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<pre style="margin: 0;">-<span id="LC1809" 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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<pre style="margin: 0;">+<span id="LC1806" 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="LC1807" 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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1811
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<pre style="margin: 0;"> <span id="LC1808" 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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1812
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1809
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<pre style="margin: 0;"> <span id="LC1809" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> then passed to tcDataDefn.</span></span>
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1810
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<pre style="margin: 0;"> <span id="LC1810" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1814" 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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1815
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<pre style="margin: 0;">-<span id="LC1815" 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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1816
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<pre style="margin: 0;">-<span id="LC1816" 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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1817
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<pre style="margin: 0;">-<span id="LC1817" 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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1818
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<pre style="margin: 0;">-<span id="LC1818" 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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<pre style="margin: 0;">-<span id="LC1819" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1820" 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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1821
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<pre style="margin: 0;">-<span id="LC1821" 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="LC1822" 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="LC1823" 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="LC1824" 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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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;"> applying the data family tycon to the patterns, and the one given 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;"> the user. This second kind is checked by the tc_kind_sig function within</span></span>
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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;"> tcDataFamInstHeader.</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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1811
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<pre style="margin: 0;"> <span id="LC1811" 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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1830
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1812
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<pre style="margin: 0;"> <span id="LC1812" 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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1831
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1813
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<pre style="margin: 0;"> <span id="LC1813" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1815" 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">@@ -1833,9 +1815,7 @@ DT3 Eta-expansion: Any forall-bound variables and function arguments in a result</td>
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1833
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1815
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<pre style="margin: 0;"> <span id="LC1815" class="line" lang="haskell"></span>
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1834
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1816
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<pre style="margin: 0;"> <span id="LC1816" 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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1835
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1817
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<pre style="margin: 0;"> <span id="LC1817" 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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1836
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<pre style="margin: 0;">-<span id="LC1836" 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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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;"> for instances. This is true for data families as well, though their</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;"> arity only matters for pretty-printing.</span></span>
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1818
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<pre style="margin: 0;">+<span id="LC1818" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> called in tcDataDefn.</span></span>
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1839
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1819
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<pre style="margin: 0;"> <span id="LC1819" class="line" lang="haskell"></span>
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1840
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1820
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<pre style="margin: 0;"> <span id="LC1820" 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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1841
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1821
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<pre style="margin: 0;"> <span id="LC1821" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in GHC.Tc.Gen.HsType.</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">@@ -1856,7 +1836,7 @@ DT4 Datatype return kind restriction: A data type return kind must end</td>
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1856
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1836
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<pre style="margin: 0;"> <span id="LC1836" 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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1857
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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;"> declarations. Examples</span></span>
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1858
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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;"> data instance D1 :: Type -- good</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;"> data instance D2 :: Boo<span class="idiff left right">ol -> Type</span> -- good</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 D2 :: Boo<span class="idiff left right">l -> Type </span> -- good</span></span>
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1860
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1840
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<pre style="margin: 0;"> <span id="LC1840" class="line" lang="haskell"></span>
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1861
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1841
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<pre style="margin: 0;"> <span id="LC1841" 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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1862
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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;"> type Star = Type</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1886" 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="1866" 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">@@ -1886,7 +1866,6 @@ DT5 Newtype return kind restriction.</td>
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1886
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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;"> If -XUnliftedNewtypes is not on, then newtypes are treated just</span></span>
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1887
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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;"> like datatypes --- see (4) above.</span></span>
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1888
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1868
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<pre style="margin: 0;"> <span id="LC1868" 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>
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1890
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1869
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<pre style="margin: 0;"> <span id="LC1869" 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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1891
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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;"> TYPE xyz, for some xyz (after type synonym expansion). The "xyz"</span></span>
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1892
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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;"> may include type families, but the TYPE part must be visible</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">@@ -1921,7 +1900,24 @@ data family T a :: <kind> -- See Point DF56</td>
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1921
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1900
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<pre style="margin: 0;"> <span id="LC1900" 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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1922
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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;">newtype instance T [a] :: <kind> where ... -- See Point DF2</span></span>
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1923
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1902
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<pre style="margin: 0;"> <span id="LC1902" class="line" lang="haskell"></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;">Here is the Plan for Data Families</span></span>
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1903
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<pre style="margin: 0;">+<span id="LC1903" 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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1904
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<pre style="margin: 0;">+<span id="LC1904" class="line" lang="haskell"></span>
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1905
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<pre style="margin: 0;">+<span id="LC1905" 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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1906
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<pre style="margin: 0;">+<span id="LC1906" class="line" lang="haskell"></span>
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1907
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<pre style="margin: 0;">+<span id="LC1907" 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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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;"> or extracted from a family declaration in getInitialKind.</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;"> If a family declaration is missing a result kind, it is assumed to be</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;"> Type. This assumption is in getInitialKind for CUSKs or</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;"> get_fam_decl_initial_kind for non-signature & non-CUSK cases.</span></span>
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1912
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<pre style="margin: 0;">+<span id="LC1912" class="line" lang="haskell"></span>
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1913
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<pre style="margin: 0;">+<span id="LC1913" 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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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;"> of an instance is then calculated by applying the data family tycon</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;"> to the patterns provided, as computed by the typeKind lhs_ty in the</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;"> end of tcDataFamInstHeader. In the case of an instance written in GADT</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;"> syntax, there are potentially *two* return kinds: the one computed from</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;"> applying the data family tycon to the patterns, and the one given by</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;"> the user. This second kind is checked by the tc_kind_sig function within</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;"> tcDataFamInstHeader. See also DF3, below.</span></span>
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1925
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1921
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<pre style="margin: 0;"> <span id="LC1921" class="line" lang="haskell"></span>
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1926
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1922
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<pre style="margin: 0;"> <span id="LC1922" 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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1927
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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;"> once instantiated, as the "master kind" for the representation</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1933" 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">@@ -1933,14 +1929,16 @@ DF1 In a data/newtype instance, we treat the kind of the /data family/,</td>
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1933
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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;"> if we declared</span></span>
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1934
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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;"> data R:T1Int :: Type -> Type where ...</span></span>
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1935
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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;"> See Note [Liberalising data family return kinds] for an alternative</span></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;"> plan. But this plan is simple, and ensures that all instances</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;"> are simple instantiations of the ma<span class="idiff left right">t</span>ster, without strange casts.</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;"> plan. But this <span class="idiff left right">current </span>plan is simple, and ensures that all instances</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;"> are simple instantiations of the master, without strange casts.</span></span>
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1938
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1934
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<pre style="margin: 0;"> <span id="LC1934" class="line" lang="haskell"></span>
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1939
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1935
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<pre style="margin: 0;"> <span id="LC1935" 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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1940
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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;"> data family T2 :: forall k. Type -> k</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;"> data instance T :: Type -> Type -> Type where ...</span></span>
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<td class="diff-line-num new old_line" data-linenumber="1942" 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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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 instance T<span class="idiff left right">2</span> :: Type -> Type -> Type where ...</span></span>
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1942
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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;"> Here 'k' gets instantiated with (Type -> Type), driven by</span></span>
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1943
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<pre style="margin: 0;">-<span id="LC1943" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the signature on the 'data instance'</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;"> the signature on the 'data instance'. (See also DT3 of</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;"> Note [Datatype return kinds] about eta-expansion, which applies here,</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;"> too; see tcDataFamInstDecl's call of etaExpandAlgTyCon.)</span></span>
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1944
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1942
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<pre style="margin: 0;"> <span id="LC1942" class="line" lang="haskell"></span>
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1945
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1943
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<pre style="margin: 0;"> <span id="LC1943" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> A newtype example:</span></span>
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1946
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1944
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<pre style="margin: 0;"> <span id="LC1944" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1960" 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="1958" 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">@@ -1960,7 +1958,7 @@ DF1 In a data/newtype instance, we treat the kind of the /data family/,</td>
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1960
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1958
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<pre style="margin: 0;"> <span id="LC1958" class="line" lang="haskell"></span>
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1961
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1959
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<pre style="margin: 0;"> <span id="LC1959" 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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1962
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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;"> must obey the usual rules for data/newtype return kinds (DT4, DT5)</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;"> <span class="idiff left right">above</span>. Examples:</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;"> <span class="idiff left right">of Note [Datatype return kinds]</span>. Examples:</span></span>
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1964
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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;"> data family T3 k :: k</span></span>
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1965
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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 instance T3 Type where ... -- OK</span></span>
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1966
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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->Type) where ... -- OK</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1983" 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="1981" 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">@@ -1983,25 +1981,25 @@ DF3 Any kind signatures on the data/newtype instance are checked for</td>
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1983
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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;"> data instance declaration</span></span>
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1984
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1982
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<pre style="margin: 0;"> <span id="LC1982" class="line" lang="haskell"></span>
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<td class="diff-line-num old_line" data-linenumber="1985" 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">
1985
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1983
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<pre style="margin: 0;"> <span id="LC1983" 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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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;"> signature in the data instance also obeys <span class="idiff left right">(4)</span>. For example we</span></span>
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<td class="diff-line-num new old_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">
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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;"> signature in the data instance also obeys <span class="idiff left right">DT4/DT5</span>. For example we</span></span>
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1987
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<td class="diff-line-num new_line" data-linenumber="1985" 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">
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;"> reject</span></span>
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<td class="diff-line-num old_line" data-linenumber="1988" 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">
1988
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<td class="diff-line-num new_line" data-linenumber="1986" 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">
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;"> data family T1 :: Type -> Type -> Type</span></span>
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<td class="diff-line-num old_line" data-linenumber="1989" 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">
1989
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<td class="diff-line-num new_line" data-linenumber="1987" 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">
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 instance T1 Int :: Type -> F Int</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1990" 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">
1990
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<td class="diff-line-num new_line old" data-linenumber="1988" 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="LC1990" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> even if (F Int ~ <span class="idiff left right">Bool</span>). We could omit this check, because we</span></span>
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<td class="diff-line-num new old_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">
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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;"> even if (F Int ~ <span class="idiff left right">Type</span>). We could omit this check, because we</span></span>
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<td class="diff-line-num old_line" data-linenumber="1991" 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">
1991
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<td class="diff-line-num new_line" data-linenumber="1989" 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">
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;"> use the master kind; but it seems more uniform to check it, again</span></span>
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<td class="diff-line-num old_line" data-linenumber="1992" 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">
1992
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<td class="diff-line-num new_line" data-linenumber="1990" 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">
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;"> with checkDataKindSig.</span></span>
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<td class="diff-line-num old_line" data-linenumber="1993" 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">
1993
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<td class="diff-line-num new_line" data-linenumber="1991" 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">
1991
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<pre style="margin: 0;"> <span id="LC1991" class="line" lang="haskell"></span>
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<td class="diff-line-num old_line" data-linenumber="1994" 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">
1994
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<td class="diff-line-num new_line" data-linenumber="1992" 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">
1992
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<pre style="margin: 0;"> <span id="LC1992" 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 old_line" data-linenumber="1995" 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">
1995
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<td class="diff-line-num new_line" data-linenumber="1993" 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">
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;"> data family D8 a :: F a</span></span>
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<td class="diff-line-num old_line" data-linenumber="1996" 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">
1996
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<td class="diff-line-num new_line" data-linenumber="1994" 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">
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;"> where F is a type family. No data/newtype instance can instantiate</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1997" 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">
1997
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<td class="diff-line-num new_line old" data-linenumber="1995" 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="LC1997" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> this so that it obeys the rules of <span class="idiff left right">(4) and (5)</span>. So GHC proactively</span></span>
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<td class="diff-line-num new old_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">
</td>
<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;"> this so that it obeys the rules of <span class="idiff left right">DT4 or DT5</span>. So GHC proactively</span></span>
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<td class="diff-line-num old_line" data-linenumber="1998" 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">
1998
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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;"> rejects the data /family/ declaration if it can never satisfy (DT4)/(DT5).</span></span>
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<td class="diff-line-num old_line" data-linenumber="1999" 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">
1999
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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;"> Remember that a data family supports both data and newtype instances.</span></span>
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<td class="diff-line-num old_line" data-linenumber="2000" 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">
2000
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<td class="diff-line-num new_line" data-linenumber="1998" 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">
1998
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<pre style="margin: 0;"> <span id="LC1998" class="line" lang="haskell"></span>
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<td class="diff-line-num old_line" data-linenumber="2001" 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">
2001
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<td class="diff-line-num new_line" data-linenumber="1999" 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">
1999
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<pre style="margin: 0;"> <span id="LC1999" 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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2002
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<td class="diff-line-num new_line" data-linenumber="2000" 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">
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;"> * TYPE xyz (for some type xyz) or</span></span>
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2003
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<td class="diff-line-num new_line" data-linenumber="2001" 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">
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;"> * a kind variable</span></span>
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2004
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<td class="diff-line-num new_line old" data-linenumber="2002" 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="LC2004" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Only in these cases can a data/newtype instance possibly satisfy (<span class="idiff left right">4)/(</span>5).</span></span>
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<td class="diff-line-num new old_line" data-linenumber="2005" 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="2002" 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">
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;"> Only in these cases can a data/newtype instance possibly satisfy (<span class="idiff left right">DT4)/(DT</span>5).</span></span>
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2005
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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;"> This is checked by the call to checkDataKindSig in tcFamDecl1. Examples:</span></span>
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<td class="diff-line-num old_line" data-linenumber="2006" 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">
2006
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2004
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<pre style="margin: 0;"> <span id="LC2004" class="line" lang="haskell"></span>
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2007
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2005
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<pre style="margin: 0;"> <span id="LC2005" 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 unfold js-unfold old_line" data-linenumber="2014" 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="2012" 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">@@ -2014,7 +2012,7 @@ DF5 Data /family/ return kind restrictions. Consider</td>
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2014
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2012
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<pre style="margin: 0;"> <span id="LC2012" class="line" lang="haskell"></span>
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2015
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2013
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<pre style="margin: 0;"> <span id="LC2013" 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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2016
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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;"> one from the family declaration and one from the instance declaration</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;"> (see point <span class="idiff left right">(2)</span> above), they are unified. More accurately, we make sure</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;"> (see point <span class="idiff left right">DF3</span> above), they are unified. More accurately, we make sure</span></span>
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2018
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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;"> that the kind of the applied data family is a subkind of the user-written</span></span>
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2019
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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;"> kind. GHC.Tc.Gen.HsType.checkExpectedKind normally does this check for types, but</span></span>
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2020
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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;"> that's overkill for our needs here. Instead, we just instantiate any</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2023" 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">@@ -2025,8 +2023,6 @@ DF6 Two return kinds for instances: If an instance has two return kinds,</td>
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2025
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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;"> the kind annotation on the instance is redundant (except perhaps for</span></span>
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2026
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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;"> effects of unification).</span></span>
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2027
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2025
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<pre style="margin: 0;"> <span id="LC2025" class="line" lang="haskell"></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>
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2030
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2026
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<pre style="margin: 0;"> <span id="LC2026" 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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2031
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2027
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<pre style="margin: 0;"> <span id="LC2027" class="line" lang="haskell"></span>
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2032
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2028
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<pre style="margin: 0;"> <span id="LC2028" 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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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2054" 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">@@ -2058,7 +2054,7 @@ well. But there are lots of complications:</td>
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2058
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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;"> exactly dual way.</span></span>
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2059
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2055
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<pre style="margin: 0;"> <span id="LC2055" class="line" lang="haskell"></span>
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2060
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2056
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<pre style="margin: 0;"> <span id="LC2056" 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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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;">why we have</span></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;">why we have<span class="idiff left right"> DF2 in Note [Data family/instance return kinds].</span></span></span>
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2062
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2058
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<pre style="margin: 0;"> <span id="LC2058" class="line" lang="haskell"></span>
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2063
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2059
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<pre style="margin: 0;"> <span id="LC2059" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Implementation of UnliftedNewtypes]</span></span>
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<pre style="margin: 0;"> <span id="LC2060" 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">@@ -2175,7 +2171,7 @@ There are also some changes for dealing with families:</td>
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<pre style="margin: 0;"> <span id="LC2171" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> we use that kind signature.</span></span>
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2172
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<pre style="margin: 0;"> <span id="LC2172" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2173" 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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<pre style="margin: 0;">-<span id="LC2178" 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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<pre style="margin: 0;">+<span id="LC2174" 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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<pre style="margin: 0;"> <span id="LC2175" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2176" 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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<pre style="margin: 0;"> <span id="LC2177" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/559dd456b071efbd2b5aff9492351a7fba237a54#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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<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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<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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<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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<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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97
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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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98
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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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99
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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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100
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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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101
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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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98
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102
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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.Tc.Utils.TcType</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1734" 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="1738" 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">@@ -1734,3 +1738,16 @@ lookupRoleAnnot = lookupNameEnv</td>
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1734
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1738
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<pre style="margin: 0;"> <span id="LC1738" 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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1735
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1739
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<pre style="margin: 0;"> <span id="LC1739" 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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1736
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1740
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<pre style="margin: 0;"> <span id="LC1740" 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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1741
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<pre style="margin: 0;">+<span id="LC1741" class="line" lang="haskell"></span>
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1742
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<pre style="margin: 0;">+<span id="LC1742" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *********************************************************************</span></span>
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1743
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<pre style="margin: 0;">+<span id="LC1743" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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1744
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<pre style="margin: 0;">+<span id="LC1744" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Linting a TcGblEnv</span></span>
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1745
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<pre style="margin: 0;">+<span id="LC1745" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></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>
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1748
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<pre style="margin: 0;">+<span id="LC1748" class="line" lang="haskell"><span class="cd">-- | Check the 'TcGblEnv' for consistency. Currently, only checks</span></span>
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1749
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<pre style="margin: 0;">+<span id="LC1749" 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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1750
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<pre style="margin: 0;">+<span id="LC1750" 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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1751
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<pre style="margin: 0;">+<span id="LC1751" 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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1752
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<pre style="margin: 0;">+<span id="LC1752" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC1753" 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/559dd456b071efbd2b5aff9492351a7fba237a54#f740374ad9d1ce333c9d2992b2feda632e24371f"><strong>docs/core-spec/CoreLint.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">@@ -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="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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<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="LC686" class="line" lang="plaintext"></span>
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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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<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/559dd456b071efbd2b5aff9492351a7fba237a54#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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59
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59
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<pre style="margin: 0;"> <span id="LC59" class="line" lang="plaintext"> | empty :: M :: empty</span>
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60
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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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<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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200
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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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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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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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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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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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380
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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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379
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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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453
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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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455
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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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460
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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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534
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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/559dd456b071efbd2b5aff9492351a7fba237a54#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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579
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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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580
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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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581
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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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587
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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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588
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<pre style="margin: 0;">+<span id="LC588" class="line" lang="tex"></span>
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589
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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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590
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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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596
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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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597
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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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598
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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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600
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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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<pre style="margin: 0;">+<span id="LC603" class="line" lang="tex"></span>
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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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<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="LC606" class="line" lang="tex"></span>
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<pre style="margin: 0;"> <span id="LC607" class="line" lang="tex"><span class="k" style="font-weight: 600;">\section</span><span class="p">{</span>Operational semantics<span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC608" class="line" lang="tex"></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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