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<h3>
Ryan Scott pushed to branch wip/T18470
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/83187784fac82b6e8db016cc68e4d8ae07c83856">83187784</a></strong>
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<span>by Ryan Scott</span>
<i>at 2020-07-28T07:49:33-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move renamer-based validity check to typechecker
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<h4>11 changed files:</h4>
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<li class="file-stats">
<a href="#7dd1cd0f6f2164a14c83d9aa564dd32bc30e447a">
compiler/GHC/Rename/Module.hs
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<li class="file-stats">
<a href="#aebe2c3d616f6843166d2657bed048898add6bc9">
compiler/GHC/Tc/Instance/Class.hs
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<li class="file-stats">
<a href="#83d23a46bb6cdc8b1edc16f1fd2c8f5c53e2c9ca">
compiler/GHC/Tc/TyCl.hs
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<li class="file-stats">
<a href="#e63425e031ffe9350ee6b1687e506aaea75d11e1">
compiler/GHC/Tc/TyCl/Instance.hs
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<li class="file-stats">
<a href="#1db07ed8cd9bab6b217a8f5a140176d3cb8672fd">
compiler/GHC/Tc/Validity.hs
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<li class="file-stats">
<a href="#166e3514d27c63ef7e86af29830d9e8b2a31c8b1">
compiler/GHC/Types/Basic.hs
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<li class="file-stats">
<a href="#1f7ad7773f18165c1995cd496c307530800645b1">
testsuite/tests/indexed-types/should_fail/Overlap5.stderr
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<li class="file-stats">
<a href="#2ae57b8c46961847488f3363ae6f023c39dd9f3a">
testsuite/tests/rename/should_fail/T16002.stderr
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<li class="file-stats">
<a href="#06967bf4eda1dcb434bb05e9373aa8fa3a467f22">
testsuite/tests/th/T15362.hs
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<li class="file-stats">
<a href="#fdc37038d819f2be8ce66bff83a7928c120c7455">
testsuite/tests/th/T15362.stderr
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<li class="file-stats">
<a href="#36df27be7e981d8004e9dc3a6fb728f175e5b374">
testsuite/tests/typecheck/should_fail/T11623.stderr
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<h4>Changes:</h4>
<li id="7dd1cd0f6f2164a14c83d9aa564dd32bc30e447a">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/83187784fac82b6e8db016cc68e4d8ae07c83856#7dd1cd0f6f2164a14c83d9aa564dd32bc30e447a"><strong>compiler/GHC/Rename/Module.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -55,7 +55,7 @@ import GHC.Types.Name.Env</td>
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Avail</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.Utils.Outputable</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.Data.Bag</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 class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">pprRuleName</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TypeOrKind</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC58" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Basic</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">pprRuleName</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TypeOrKind</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)<span class="idiff left">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">ClosedTyFamInfo</span></span><span class="p"><span class="idiff">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">..</span></span><span class="p"><span class="idiff right">)</span></span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC59" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.FastString</span></span>
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.SrcLoc</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">SrcLoc</span></span>
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<pre style="margin: 0;"> <span id="LC61" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Driver.Session</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="763" 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">@@ -763,7 +763,7 @@ rnFamInstEqn doc atfi rhs_kvars</td>
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<pre style="margin: 0;"> <span id="LC763" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">eqn_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs_fvs</span> <span class="p">`</span><span class="n" style="color: #333;">plusFV</span><span class="p">`</span> <span class="n" style="color: #333;">pat_fvs</span></span>
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<pre style="margin: 0;"> <span id="LC764" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Type family equations and occurrences]</span></span>
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<pre style="margin: 0;"> <span id="LC765" class="line" lang="haskell"> <span class="n" style="color: #333;">all_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">atfi</span> <span class="kr" style="font-weight: 600;">of</span></span>
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766
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<pre style="margin: 0;">-<span id="LC766" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NonAssocTyFamEqn</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">ClosedTyFam</span></span><span class="p"><span class="idiff right">{})</span></span></span>
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<pre style="margin: 0;">+<span id="LC766" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NonAssocTyFamEqn</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">ClosedTyFam</span></span></span>
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<pre style="margin: 0;"> <span id="LC767" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">eqn_fvs</span></span>
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<pre style="margin: 0;"> <span id="LC768" 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;">eqn_fvs</span> <span class="p">`</span><span class="n" style="color: #333;">addOneFV</span><span class="p">`</span> <span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">tycon'</span></span>
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<pre style="margin: 0;"> <span id="LC769" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -851,34 +851,15 @@ data AssocTyFamInfo</td>
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<pre style="margin: 0;"> <span id="LC851" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="c1" style="color: #998; font-style: italic;">-- Name of the parent class</span></span>
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<pre style="margin: 0;"> <span id="LC852" class="line" lang="haskell"> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- Names of the tyvars of the parent instance decl</span></span>
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<pre style="margin: 0;"> <span id="LC853" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC854" class="line" lang="haskell"><span class="cd">-- | Tracks whether we are renaming an equation in a closed type family</span></span>
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<pre style="margin: 0;">-<span id="LC855" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- equation ('ClosedTyFam') or not ('NotClosedTyFam').</span></span>
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<pre style="margin: 0;">-<span id="LC856" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">ClosedTyFamInfo</span></span>
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<pre style="margin: 0;">-<span id="LC857" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NotClosedTyFam</span></span>
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<pre style="margin: 0;">-<span id="LC858" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ClosedTyFam</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">RdrName</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span></span>
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<pre style="margin: 0;">-<span id="LC859" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The names (RdrName and Name) of the closed type family</span></span>
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<pre style="margin: 0;">-<span id="LC860" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC854" class="line" lang="haskell"><span class="n" style="color: #333;">rnTyFamInstEqn</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">AssocTyFamInfo</span></span>
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<pre style="margin: 0;"> <span id="LC855" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyFamInstEqn</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
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<pre style="margin: 0;"> <span id="LC856" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RnM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyFamInstEqn</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">FreeVars</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC857" class="line" lang="haskell"><span class="n" style="color: #333;">rnTyFamInstEqn</span> <span class="n" style="color: #333;">atfi</span></span>
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<pre style="margin: 0;"> <span id="LC858" class="line" lang="haskell"> <span class="n" style="color: #333;">eqn</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsIB</span> <span class="p">{</span> <span class="n" style="color: #333;">hsib_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FamEqn</span> <span class="p">{</span> <span class="n" style="color: #333;">feqn_tycon</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tycon</span></span>
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<pre style="margin: 0;"> <span id="LC859" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">feqn_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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<pre style="margin: 0;">-<span id="LC867" 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;">let</span> <span class="n" style="color: #333;">rhs_kvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extractHsTyRdrTyVarsKindVars</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;">-<span id="LC868" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">eqn'</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsIB</span> <span class="p">{</span> <span class="n" style="color: #333;">hsib_body</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">-<span id="LC869" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">FamEqn</span> <span class="p">{</span> <span class="n" style="color: #333;">feqn_tycon</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">tycon'</span> <span class="p">}}),</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC870" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnFamInstEqn</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TySynCtx</span> <span class="n" style="color: #333;">tycon</span><span class="p">)</span> <span class="n" style="color: #333;">atfi</span> <span class="n" style="color: #333;">rhs_kvs</span> <span class="n" style="color: #333;">eqn</span> <span class="n" style="color: #333;">rnTySyn</span></span>
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<pre style="margin: 0;">-<span id="LC871" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC872" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- For closed type families, check that each equation is for the</span></span>
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<pre style="margin: 0;">-<span id="LC873" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- right type family. E.g. barf on</span></span>
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<pre style="margin: 0;">-<span id="LC874" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- type family F a where { G Int = Bool }</span></span>
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<pre style="margin: 0;">-<span id="LC875" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">atfi</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC876" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NonAssocTyFamEqn</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ClosedTyFam</span> <span class="n" style="color: #333;">fam_rdr_name</span> <span class="n" style="color: #333;">fam_name</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">-<span id="LC877" class="line" lang="haskell"> <span class="n" style="color: #333;">checkTc</span> <span class="p">(</span><span class="n" style="color: #333;">fam_name</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">tycon'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC878" class="line" lang="haskell"> <span class="n" style="color: #333;">withHsDocContext</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyFamilyCtx</span> <span class="n" style="color: #333;">fam_rdr_name</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC879" class="line" lang="haskell"> <span class="n" style="color: #333;">wrongTyFamName</span> <span class="n" style="color: #333;">fam_name</span> <span class="n" style="color: #333;">tycon'</span></span>
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<pre style="margin: 0;">-<span id="LC880" 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;">pure</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">-<span id="LC881" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">eqn'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC860" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rnFamInstEqn</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TySynCtx</span> <span class="n" style="color: #333;">tycon</span><span class="p">)</span> <span class="n" style="color: #333;">atfi</span> <span class="n" style="color: #333;">rhs_kvs</span> <span class="n" style="color: #333;">eqn</span> <span class="n" style="color: #333;">rnTySyn</span></span>
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<pre style="margin: 0;">+<span id="LC861" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC862" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_kvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extractHsTyRdrTyVarsKindVars</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;"> <span id="LC863" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC864" class="line" lang="haskell"><span class="n" style="color: #333;">rnTyFamDefltDecl</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span></span>
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<pre style="margin: 0;"> <span id="LC865" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyFamDefltDecl</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</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">@@ -2023,7 +2004,7 @@ rnFamDecl mb_cls (FamilyDecl { fdLName = tycon, fdTyVars = tyvars</td>
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2004
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<pre style="margin: 0;"> <span id="LC2004" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">injectivity'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">traverse</span> <span class="p">(</span><span class="n" style="color: #333;">rnInjectivityAnn</span> <span class="n" style="color: #333;">tyvars'</span> <span class="n" style="color: #333;">res_sig'</span><span class="p">)</span></span>
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2005
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<pre style="margin: 0;"> <span id="LC2005" class="line" lang="haskell"> <span class="n" style="color: #333;">injectivity</span></span>
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2006
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<pre style="margin: 0;"> <span id="LC2006" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span> <span class="p">(</span><span class="n" style="color: #333;">tyvars'</span><span class="p">,</span> <span class="n" style="color: #333;">res_sig'</span><span class="p">,</span> <span class="n" style="color: #333;">injectivity'</span><span class="p">)</span> <span class="p">,</span> <span class="n" style="color: #333;">fv_kind</span> <span class="p">)</span> <span class="p">}</span></span>
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2026
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<pre style="margin: 0;">-<span id="LC2026" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">info'</span><span class="p">,</span> <span class="n" style="color: #333;">fv2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rn_info</span> <span class="n" style="color: #333;"><span class="idiff left">tycon'</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">info</span></span>
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2007
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<pre style="margin: 0;">+<span id="LC2007" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">info'</span><span class="p">,</span> <span class="n" style="color: #333;">fv2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rn_info</span> <span class="n" style="color: #333;">info</span></span>
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2027
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2008
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<pre style="margin: 0;"> <span id="LC2008" 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;">FamilyDecl</span> <span class="p">{</span> <span class="n" style="color: #333;">fdExt</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">noExtField</span></span>
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2028
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2009
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<pre style="margin: 0;"> <span id="LC2009" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fdLName</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tycon'</span><span class="p">,</span> <span class="n" style="color: #333;">fdTyVars</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyvars'</span></span>
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2029
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2010
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<pre style="margin: 0;"> <span id="LC2010" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fdFixity</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fixity</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2035" 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="2016" 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">@@ -2035,18 +2016,16 @@ rnFamDecl mb_cls (FamilyDecl { fdLName = tycon, fdTyVars = tyvars</td>
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2035
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2016
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<pre style="margin: 0;"> <span id="LC2016" class="line" lang="haskell"> <span class="n" style="color: #333;">kvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extractRdrKindSigVars</span> <span class="n" style="color: #333;">res_sig</span></span>
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2036
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2017
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<pre style="margin: 0;"> <span id="LC2017" class="line" lang="haskell"></span>
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2037
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2018
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<pre style="margin: 0;"> <span id="LC2018" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">----------------------</span></span>
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2038
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<pre style="margin: 0;">-<span id="LC2038" class="line" lang="haskell"> <span class="n" style="color: #333;">rn_info</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span></span>
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2039
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<pre style="margin: 0;">-<span id="LC2039" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FamilyInfo</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RnM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FamilyInfo</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">FreeVars</span><span class="p">)</span></span>
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2040
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<pre style="margin: 0;">-<span id="LC2040" class="line" lang="haskell"> <span class="n" style="color: #333;">rn_info</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">fam_name</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ClosedTypeFamily</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">eqns</span><span class="p">))</span></span>
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2019
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<pre style="margin: 0;">+<span id="LC2019" class="line" lang="haskell"> <span class="n" style="color: #333;">rn_info</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FamilyInfo</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RnM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FamilyInfo</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">FreeVars</span><span class="p">)</span></span>
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2020
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<pre style="margin: 0;">+<span id="LC2020" class="line" lang="haskell"> <span class="n" style="color: #333;">rn_info</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ClosedTypeFamily</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">eqns</span><span class="p">))</span></span>
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2041
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2021
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<pre style="margin: 0;"> <span id="LC2021" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">eqns'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span></span>
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2042
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<pre style="margin: 0;">-<span id="LC2042" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnList</span> <span class="p">(</span><span class="n" style="color: #333;">rnTyFamInstEqn</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NonAssocTyFamEqn</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">ClosedTyFam</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tycon</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fam_name</span></span><span class="p"><span class="idiff right">)))</span></span></span>
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<td class="diff-line-num new old_line" data-linenumber="2043" 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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2022
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<pre style="margin: 0;">+<span id="LC2022" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnList</span> <span class="p">(</span><span class="n" style="color: #333;">rnTyFamInstEqn</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NonAssocTyFamEqn</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">ClosedTyFam</span></span><span class="p"><span class="idiff">))</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">eqns</span></span></span>
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2043
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2023
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<pre style="margin: 0;"> <span id="LC2023" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- no class context</span></span>
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2044
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<pre style="margin: 0;">-<span id="LC2044" class="line" lang="haskell"> <span class="n" style="color: #333;">eqns</span></span>
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2045
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2024
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<pre style="margin: 0;"> <span id="LC2024" 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;">ClosedTypeFamily</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">eqns'</span><span class="p">),</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="p">}</span></span>
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2046
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<pre style="margin: 0;">-<span id="LC2046" class="line" lang="haskell"> <span class="n" style="color: #333;">rn_info</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">_</span></span><span class="idiff right"> </span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ClosedTypeFamily</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">)</span></span>
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2025
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<pre style="margin: 0;">+<span id="LC2025" class="line" lang="haskell"> <span class="n" style="color: #333;">rn_info</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ClosedTypeFamily</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">)</span></span>
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2047
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<td class="diff-line-num new_line" data-linenumber="2026" 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">
2026
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<pre style="margin: 0;"> <span id="LC2026" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ClosedTypeFamily</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">,</span> <span class="n" style="color: #333;">emptyFVs</span><span class="p">)</span></span>
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2048
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<td class="diff-line-num new_line old" data-linenumber="2027" 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="LC2048" class="line" lang="haskell"> <span class="n" style="color: #333;">rn_info</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">_</span></span><span class="idiff right"> </span><span class="kt" style="color: #458; font-weight: 600;">OpenTypeFamily</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">OpenTypeFamily</span><span class="p">,</span> <span class="n" style="color: #333;">emptyFVs</span><span class="p">)</span></span>
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2049
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<td class="diff-line-num new_line old" data-linenumber="2027" 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="LC2049" class="line" lang="haskell"> <span class="n" style="color: #333;">rn_info</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">_</span></span><span class="idiff right"> </span><span class="kt" style="color: #458; font-weight: 600;">DataFamily</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DataFamily</span><span class="p">,</span> <span class="n" style="color: #333;">emptyFVs</span><span class="p">)</span></span>
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2027
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<pre style="margin: 0;">+<span id="LC2027" class="line" lang="haskell"> <span class="n" style="color: #333;">rn_info</span> <span class="kt" style="color: #458; font-weight: 600;">OpenTypeFamily</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">OpenTypeFamily</span><span class="p">,</span> <span class="n" style="color: #333;">emptyFVs</span><span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2028" 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">
2028
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<pre style="margin: 0;">+<span id="LC2028" class="line" lang="haskell"> <span class="n" style="color: #333;">rn_info</span> <span class="kt" style="color: #458; font-weight: 600;">DataFamily</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DataFamily</span><span class="p">,</span> <span class="n" style="color: #333;">emptyFVs</span><span class="p">)</span></span>
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2050
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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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2051
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2030
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<pre style="margin: 0;"> <span id="LC2030" class="line" lang="haskell"><span class="n" style="color: #333;">rnFamResultSig</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsDocContext</span></span>
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2052
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2031
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<pre style="margin: 0;"> <span id="LC2031" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FamilyResultSig</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2190" 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="2169" 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">@@ -2190,13 +2169,6 @@ are no data constructors we allow h98_style = True</td>
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2190
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2169
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<pre style="margin: 0;"> <span id="LC2169" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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2191
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2170
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<pre style="margin: 0;"> <span id="LC2170" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">***************************************************** -}</span></span>
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2192
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2171
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<pre style="margin: 0;"> <span id="LC2171" class="line" lang="haskell"></span>
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2193
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<pre style="margin: 0;">-<span id="LC2193" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">---------------</span></span>
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2194
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<pre style="margin: 0;">-<span id="LC2194" class="line" lang="haskell"><span class="n" style="color: #333;">wrongTyFamName</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Name</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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2195
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<pre style="margin: 0;">-<span id="LC2195" class="line" lang="haskell"><span class="n" style="color: #333;">wrongTyFamName</span> <span class="n" style="color: #333;">fam_tc_name</span> <span class="n" style="color: #333;">eqn_tc_name</span></span>
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2196
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<pre style="margin: 0;">-<span id="LC2196" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Mismatched type name in type family instance."</span><span class="p">)</span></span>
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2197
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<pre style="margin: 0;">-<span id="LC2197" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span> <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;">"Expected:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fam_tc_name</span></span>
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2198
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<pre style="margin: 0;">-<span id="LC2198" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">" Actual:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">eqn_tc_name</span> <span class="p">])</span></span>
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2199
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<pre style="margin: 0;">-<span id="LC2199" class="line" lang="haskell"></span>
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2172
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<pre style="margin: 0;"> <span id="LC2172" 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="LC2173" class="line" lang="haskell"><span class="n" style="color: #333;">rnConDecls</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LConDecl</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RnM</span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">LConDecl</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">FreeVars</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2174" class="line" lang="haskell"><span class="n" style="color: #333;">rnConDecls</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapFvRn</span> <span class="p">(</span><span class="n" style="color: #333;">wrapLocFstM</span> <span class="n" style="color: #333;">rnConDecl</span><span class="p">)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/83187784fac82b6e8db016cc68e4d8ae07c83856#aebe2c3d616f6843166d2657bed048898add6bc9"><strong>compiler/GHC/Tc/Instance/Class.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">@@ -31,6 +31,7 @@ import GHC.Builtin.Types</td>
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<pre style="margin: 0;"> <span id="LC31" 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 class="p">(</span> <span class="n" style="color: #333;">eqPrimTyCon</span><span class="p">,</span> <span class="n" style="color: #333;">eqReprPrimTyCon</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Builtin.Names</span></span>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"></span>
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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.Basic</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">ClosedTyFamInfo</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span> <span class="p">)</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.Types.Id</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.Core.Type</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.Core.Make</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">mkStringExprFS</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkNaturalExpr</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">@@ -58,6 +59,7 @@ import Data.Maybe</td>
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<pre style="margin: 0;"> <span id="LC59" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The @VarEnv Type@ maps class variables to their instance types.</span></span>
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">AssocInstInfo</span></span>
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<pre style="margin: 0;"> <span id="LC61" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NotAssociated</span></span>
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<pre style="margin: 0;">+<span id="LC62" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ClosedTyFamInfo</span> <span class="c1" style="color: #998; font-style: italic;">-- Is this a closed type family?</span></span>
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<pre style="margin: 0;"> <span id="LC63" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">InClsInst</span> <span class="p">{</span> <span class="n" style="color: #333;">ai_class</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Class</span></span>
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<pre style="margin: 0;"> <span id="LC64" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ai_tyvars</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;">-- ^ The /scoped/ tyvars of the instance</span></span>
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<pre style="margin: 0;"> <span id="LC65" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Why scoped? See bind_me in</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -67,8 +69,8 @@ data AssocInstInfo</td>
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<pre style="margin: 0;"> <span id="LC69" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC70" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="haskell"><span class="n" style="color: #333;">isNotAssociated</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">AssocInstInfo</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">-<span id="LC70" class="line" lang="haskell"><span class="n" style="color: #333;">isNotAssociated</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">NotAssociated</span></span><span class="idiff right"> </span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">-<span id="LC71" class="line" lang="haskell"><span class="n" style="color: #333;">isNotAssociated</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">InClsInst</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">+<span id="LC72" class="line" lang="haskell"><span class="n" style="color: #333;">isNotAssociated</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NotAssociated</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">{})</span></span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">+<span id="LC73" class="line" lang="haskell"><span class="n" style="color: #333;">isNotAssociated</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">InClsInst</span> <span class="p">{})</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;"> <span id="LC74" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC75" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC76" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *******************************************************************</span></span>
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<li id="83d23a46bb6cdc8b1edc16f1fd2c8f5c53e2c9ca">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/83187784fac82b6e8db016cc68e4d8ae07c83856#83d23a46bb6cdc8b1edc16f1fd2c8f5c53e2c9ca"><strong>compiler/GHC/Tc/TyCl.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2432,7 +2432,7 @@ tcDefaultAssocDecl fam_tc</td>
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2432
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<pre style="margin: 0;"> <span id="LC2432" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- at an associated type. But this would be wrong, because an associated</span></span>
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2433
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2433
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<pre style="margin: 0;"> <span id="LC2433" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- type default LHS can mention *different* type variables than the</span></span>
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2434
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2434
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<pre style="margin: 0;"> <span id="LC2434" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- enclosing class. So it's treated more as a freestanding beast.</span></span>
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2435
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<pre style="margin: 0;">-<span id="LC2435" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">qtvs</span><span class="p">,</span> <span class="n" style="color: #333;">pats</span><span class="p">,</span> <span class="n" style="color: #333;">rhs_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcTyFamInstEqnGuts</span> <span class="n" style="color: #333;">fam_tc</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">NotAssociated</span></span></span>
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<pre style="margin: 0;">+<span id="LC2435" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">qtvs</span><span class="p">,</span> <span class="n" style="color: #333;">pats</span><span class="p">,</span> <span class="n" style="color: #333;">rhs_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcTyFamInstEqnGuts</span> <span class="n" style="color: #333;">fam_tc</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NotAssociated</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NotClosedTyFam</span></span><span class="p"><span class="idiff right">)</span></span></span>
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2436
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2436
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<pre style="margin: 0;"> <span id="LC2436" class="line" lang="haskell"> <span class="n" style="color: #333;">imp_vars</span> <span class="p">(</span><span class="n" style="color: #333;">mb_expl_bndrs</span> <span class="p">`</span><span class="n" style="color: #333;">orElse</span><span class="p">`</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span></span>
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2437
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<pre style="margin: 0;"> <span id="LC2437" class="line" lang="haskell"> <span class="n" style="color: #333;">hs_pats</span> <span class="n" style="color: #333;">hs_rhs_ty</span></span>
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2438
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2438
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<pre style="margin: 0;"> <span id="LC2438" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2639" 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">@@ -2639,7 +2639,7 @@ tcFamDecl1 parent (FamilyDecl { fdInfo = fam_info</td>
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2639
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2639
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<pre style="margin: 0;"> <span id="LC2639" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="cm" style="color: #998; font-style: italic;">{- this doesn't matter here -}</span></span>
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2640
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2640
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<pre style="margin: 0;"> <span id="LC2640" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ClosedTypeFamilyFlavour</span></span>
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2641
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2641
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<pre style="margin: 0;"> <span id="LC2641" class="line" lang="haskell"></span>
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2642
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<pre style="margin: 0;">-<span id="LC2642" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">branches</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapAndReportM</span> <span class="p">(</span><span class="n" style="color: #333;">tcTyFamInstEqn</span> <span class="n" style="color: #333;">tc_fam_tc</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">NotAssociated</span></span><span class="p">)</span> <span class="n" style="color: #333;">eqns</span></span>
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<pre style="margin: 0;">+<span id="LC2642" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">branches</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapAndReportM</span> <span class="p">(</span><span class="n" style="color: #333;">tcTyFamInstEqn</span> <span class="n" style="color: #333;">tc_fam_tc</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NotAssociated</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">ClosedTyFam</span></span><span class="p"><span class="idiff right">)</span>)</span> <span class="n" style="color: #333;">eqns</span></span>
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<pre style="margin: 0;"> <span id="LC2643" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Do not attempt to drop equations dominated by earlier</span></span>
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<pre style="margin: 0;"> <span id="LC2644" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ones here; in the case of mutual recursion with a data</span></span>
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<pre style="margin: 0;"> <span id="LC2645" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- type, we get a knot-tying failure. Instead we check</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">@@ -2862,16 +2862,25 @@ tcTyFamInstEqn fam_tc mb_clsinfo</td>
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<pre style="margin: 0;"> <span id="LC2862" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">feqn_bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mb_expl_bndrs</span></span>
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<pre style="margin: 0;"> <span id="LC2863" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">feqn_pats</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_pats</span></span>
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<pre style="margin: 0;"> <span id="LC2864" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">feqn_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_rhs_ty</span> <span class="p">}}))</span></span>
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<pre style="margin: 0;">-<span id="LC2865" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">getName</span> <span class="n" style="color: #333;">fam_tc</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">eqn_tc_name</span> <span class="p">)</span></span>
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2866
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<pre style="margin: 0;">-<span id="LC2866" class="line" lang="haskell"> <span class="n" style="color: #333;">setSrcSpan</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC2865" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setSrcSpan</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC2866" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tcTyFamInstEqn"</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC2867" class="line" lang="haskell"> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fam_tc</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">hs_pats</span></span>
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2869
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<pre style="margin: 0;"> <span id="LC2868" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"fam tc bndrs"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pprTyVars</span> <span class="p">(</span><span class="n" style="color: #333;">tyConTyVars</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="LC2869" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">mb_clsinfo</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2871
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<pre style="margin: 0;">-<span id="LC2871" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NotAssociated</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">empty</span></span>
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<pre style="margin: 0;">+<span id="LC2870" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NotAssociated</span> <span class="p"><span class="idiff left">{}</span></span><span class="idiff right"> </span><span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">empty</span></span>
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<pre style="margin: 0;"> <span id="LC2871" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">InClsInst</span> <span class="p">{</span> <span class="n" style="color: #333;">ai_class</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cls</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"class"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cls</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pprTyVars</span> <span class="p">(</span><span class="n" style="color: #333;">classTyVars</span> <span class="n" style="color: #333;">cls</span><span class="p">)</span> <span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC2872" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2874" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- First, check the arity of visible arguments</span></span>
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<pre style="margin: 0;">+<span id="LC2873" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- First, check if we're dealing with a closed type family equation, and</span></span>
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<pre style="margin: 0;">+<span id="LC2874" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- if so, ensure that each equation's type constructor is for the right</span></span>
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<pre style="margin: 0;">+<span id="LC2875" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- type family. E.g. barf on</span></span>
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<pre style="margin: 0;">+<span id="LC2876" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- type family F a where { G Int = Bool }</span></span>
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<pre style="margin: 0;">+<span id="LC2877" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">mb_clsinfo</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2878
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<pre style="margin: 0;">+<span id="LC2878" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NotAssociated</span> <span class="kt" style="color: #458; font-weight: 600;">ClosedTyFam</span></span>
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2879
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<pre style="margin: 0;">+<span id="LC2879" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">checkTc</span> <span class="p">(</span><span class="n" style="color: #333;">fam_tc_name</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">eqn_tc_name</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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2880
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<pre style="margin: 0;">+<span id="LC2880" class="line" lang="haskell"> <span class="n" style="color: #333;">wrongTyFamName</span> <span class="n" style="color: #333;">fam_tc_name</span> <span class="n" style="color: #333;">eqn_tc_name</span></span>
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2881
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<pre style="margin: 0;">+<span id="LC2881" 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;">pure</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC2882" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2883" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Next, check the arity of visible arguments</span></span>
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2884
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<pre style="margin: 0;"> <span id="LC2884" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If we wait until validity checking, we'll get kind errors</span></span>
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<pre style="margin: 0;"> <span id="LC2885" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- below when an arity error will be much easier to understand.</span></span>
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<pre style="margin: 0;"> <span id="LC2886" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">vis_arity</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">length</span> <span class="p">(</span><span class="n" style="color: #333;">tyConVisibleTyVars</span> <span class="n" style="color: #333;">fam_tc</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">@@ -2886,6 +2895,8 @@ tcTyFamInstEqn fam_tc mb_clsinfo</td>
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<pre style="margin: 0;"> <span id="LC2895" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkCoAxBranch</span> <span class="n" style="color: #333;">qtvs</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">pats</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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2896
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<pre style="margin: 0;"> <span id="LC2896" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">const</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span><span class="p">)</span> <span class="n" style="color: #333;">qtvs</span><span class="p">)</span></span>
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2897
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<pre style="margin: 0;"> <span id="LC2897" class="line" lang="haskell"> <span class="n" style="color: #333;">loc</span><span class="p">)</span> <span class="p">}</span></span>
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2898
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<pre style="margin: 0;">+<span id="LC2898" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2899
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<pre style="margin: 0;">+<span id="LC2899" class="line" lang="haskell"> <span class="n" style="color: #333;">fam_tc_name</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">getName</span> <span class="n" style="color: #333;">fam_tc</span></span>
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2889
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2900
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<pre style="margin: 0;"> <span id="LC2900" class="line" lang="haskell"></span>
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2901
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<pre style="margin: 0;"> <span id="LC2901" 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="LC2902" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Kind check type patterns and kind annotate the embedded type variables.</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">@@ -4919,6 +4930,12 @@ incoherentRoles = (text "Roles other than" <+> quotes (text "nominal") <+></td>
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4919
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4930
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<pre style="margin: 0;"> <span id="LC4930" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"for class parameters can lead to incoherence."</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$$</span></span>
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4920
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4931
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<pre style="margin: 0;"> <span id="LC4931" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Use IncoherentInstances to allow this; bad role found"</span><span class="p">)</span></span>
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4921
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4932
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<pre style="margin: 0;"> <span id="LC4932" class="line" lang="haskell"></span>
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4933
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<pre style="margin: 0;">+<span id="LC4933" class="line" lang="haskell"><span class="n" style="color: #333;">wrongTyFamName</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Name</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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4934
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<pre style="margin: 0;">+<span id="LC4934" class="line" lang="haskell"><span class="n" style="color: #333;">wrongTyFamName</span> <span class="n" style="color: #333;">fam_tc_name</span> <span class="n" style="color: #333;">eqn_tc_name</span></span>
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4935
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<pre style="margin: 0;">+<span id="LC4935" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Mismatched type name in type family instance."</span><span class="p">)</span></span>
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4936
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<pre style="margin: 0;">+<span id="LC4936" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span> <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;">"Expected:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fam_tc_name</span></span>
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4937
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<pre style="margin: 0;">+<span id="LC4937" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">" Actual:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">eqn_tc_name</span> <span class="p">])</span></span>
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4938
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<pre style="margin: 0;">+<span id="LC4938" class="line" lang="haskell"></span>
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4922
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4939
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<pre style="margin: 0;"> <span id="LC4939" class="line" lang="haskell"><span class="n" style="color: #333;">addTyConCtxt</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;">TcM</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;">TcM</span> <span class="n" style="color: #333;">a</span></span>
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4923
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4940
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<pre style="margin: 0;"> <span id="LC4940" class="line" lang="haskell"><span class="n" style="color: #333;">addTyConCtxt</span> <span class="n" style="color: #333;">tc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addTyConFlavCtxt</span> <span class="n" style="color: #333;">name</span> <span class="n" style="color: #333;">flav</span></span>
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4941
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<pre style="margin: 0;"> <span id="LC4941" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/83187784fac82b6e8db016cc68e4d8ae07c83856#e63425e031ffe9350ee6b1687e506aaea75d11e1"><strong>compiler/GHC/Tc/TyCl/Instance.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -458,11 +458,11 @@ tcLocalInstDecl :: LInstDecl GhcRn</td>
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458
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458
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<pre style="margin: 0;"> <span id="LC458" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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459
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459
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<pre style="margin: 0;"> <span id="LC459" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We check for respectable instance type, and context</span></span>
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460
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460
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<pre style="margin: 0;"> <span id="LC460" class="line" lang="haskell"><span class="n" style="color: #333;">tcLocalInstDecl</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyFamInstD</span> <span class="p">{</span> <span class="n" style="color: #333;">tfid_inst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">decl</span> <span class="p">}))</span></span>
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461
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<pre style="margin: 0;">-<span id="LC461" 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;">fam_inst</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcTyFamInstDecl</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">NotAssociated</span></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">decl</span><span class="p">)</span></span>
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461
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<pre style="margin: 0;">+<span id="LC461" 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;">fam_inst</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcTyFamInstDecl</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NotAssociated</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NotClosedTyFam</span></span><span class="p"><span class="idiff right">)</span></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">decl</span><span class="p">)</span></span>
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462
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462
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<pre style="margin: 0;"> <span id="LC462" 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;">[]</span><span class="p">,</span> <span class="p">[</span><span class="n" style="color: #333;">fam_inst</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC463" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC464" class="line" lang="haskell"><span class="n" style="color: #333;">tcLocalInstDecl</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DataFamInstD</span> <span class="p">{</span> <span class="n" style="color: #333;">dfid_inst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">decl</span> <span class="p">}))</span></span>
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<pre style="margin: 0;">-<span id="LC465" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">fam_inst</span><span class="p">,</span> <span class="n" style="color: #333;">m_deriv_info</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcDataFamInstDecl</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">NotAssociated</span></span> <span class="n" style="color: #333;">emptyVarEnv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">decl</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC465" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">fam_inst</span><span class="p">,</span> <span class="n" style="color: #333;">m_deriv_info</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcDataFamInstDecl</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NotAssociated</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NotClosedTyFam</span></span><span class="p"><span class="idiff right">)</span></span> <span class="n" style="color: #333;">emptyVarEnv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">decl</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC466" 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;">[]</span><span class="p">,</span> <span class="p">[</span><span class="n" style="color: #333;">fam_inst</span><span class="p">],</span> <span class="n" style="color: #333;">maybeToList</span> <span class="n" style="color: #333;">m_deriv_info</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC467" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC468" class="line" lang="haskell"><span class="n" style="color: #333;">tcLocalInstDecl</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ClsInstD</span> <span class="p">{</span> <span class="n" style="color: #333;">cid_inst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">decl</span> <span class="p">}))</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/83187784fac82b6e8db016cc68e4d8ae07c83856#1db07ed8cd9bab6b217a8f5a140176d3cb8672fd"><strong>compiler/GHC/Tc/Validity.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">@@ -2271,7 +2271,7 @@ checkConsistentFamInst :: AssocInstInfo</td>
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<pre style="margin: 0;"> <span id="LC2271" 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="LC2272" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Checking consistent instantiation]</span></span>
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<pre style="margin: 0;"> <span id="LC2273" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2274" class="line" lang="haskell"><span class="n" style="color: #333;">checkConsistentFamInst</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">NotAssociated</span></span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span></span>
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<pre style="margin: 0;">+<span id="LC2274" class="line" lang="haskell"><span class="n" style="color: #333;">checkConsistentFamInst</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NotAssociated</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">{})</span></span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span></span>
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<pre style="margin: 0;"> <span id="LC2275" class="line" lang="haskell"> <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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<pre style="margin: 0;"> <span id="LC2276" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2277" class="line" lang="haskell"><span class="n" style="color: #333;">checkConsistentFamInst</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">InClsInst</span> <span class="p">{</span> <span class="n" style="color: #333;">ai_class</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">clas</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/83187784fac82b6e8db016cc68e4d8ae07c83856#166e3514d27c63ef7e86af29830d9e8b2a31c8b1"><strong>compiler/GHC/Types/Basic.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">@@ -108,7 +108,9 @@ module GHC.Types.Basic (</td>
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<pre style="margin: 0;"> <span id="LC108" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC109" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SpliceExplicitFlag</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span></span>
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<pre style="margin: 0;"> <span id="LC110" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC111" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TypeOrKind</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">isTypeLevel</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isKindLevel</span></span>
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<pre style="margin: 0;">+<span id="LC111" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TypeOrKind</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">isTypeLevel</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isKindLevel</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC112" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC113" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ClosedTyFamInfo</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC114" 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="LC115" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC116" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Prelude</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">@@ -1843,3 +1845,16 @@ isTypeLevel KindLevel = False</td>
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1843
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<pre style="margin: 0;"> <span id="LC1845" class="line" lang="haskell"><span class="n" style="color: #333;">isKindLevel</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TypeOrKind</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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1846
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<pre style="margin: 0;"> <span id="LC1846" class="line" lang="haskell"><span class="n" style="color: #333;">isKindLevel</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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1847
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<pre style="margin: 0;"> <span id="LC1847" class="line" lang="haskell"><span class="n" style="color: #333;">isKindLevel</span> <span class="kt" style="color: #458; font-weight: 600;">KindLevel</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">+<span id="LC1848" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1849" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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<pre style="margin: 0;">+<span id="LC1850" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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1851
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<pre style="margin: 0;">+<span id="LC1851" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<pre style="margin: 0;">+<span id="LC1852" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ClosedTyFamInfo</span></span>
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<pre style="margin: 0;">+<span id="LC1853" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<pre style="margin: 0;">+<span id="LC1854" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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1855
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<pre style="margin: 0;">+<span id="LC1855" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;">+<span id="LC1856" class="line" lang="haskell"></span>
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1857
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<pre style="margin: 0;">+<span id="LC1857" class="line" lang="haskell"><span class="cd">-- | Is a type family closed ('ClosedTyFam') or not ('NotClosedTyFam')?</span></span>
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1858
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<pre style="margin: 0;">+<span id="LC1858" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">ClosedTyFamInfo</span></span>
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<pre style="margin: 0;">+<span id="LC1859" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NotClosedTyFam</span></span>
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1860
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<pre style="margin: 0;">+<span id="LC1860" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ClosedTyFam</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/83187784fac82b6e8db016cc68e4d8ae07c83856#1f7ad7773f18165c1995cd496c307530800645b1"><strong>testsuite/tests/indexed-types/should_fail/Overlap5.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">Overlap5.hs:8:3: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> Mismatched type name in type family instance.</span>
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4
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> Expected: F</span>
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5
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> Actual: G</span>
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6
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext"> <span class="idiff left right">In the declaration for type family</span> ‘F’</span></pre>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> <span class="idiff left right">• </span>Mismatched type name in type family instance.</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> <span class="idiff left right"> </span>Expected: F</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> <span class="idiff left right"> </span>Actual: G</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> <span class="idiff left right">• In the type family declaration for</span> ‘F’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/83187784fac82b6e8db016cc68e4d8ae07c83856#2ae57b8c46961847488f3363ae6f023c39dd9f3a"><strong>testsuite/tests/rename/should_fail/T16002.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">T16002.hs:6:3: error:</span>
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3
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> Mismatched type name in type family instance.</span>
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4
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> Expected: B</span>
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5
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> Actual: A</span>
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6
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext"> <span class="idiff left right">In the declaration for type family</span> ‘B’</span></pre>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> <span class="idiff left right">• </span>Mismatched type name in type family instance.</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> <span class="idiff left right"> </span>Expected: B</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> <span class="idiff left right"> </span>Actual: A</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> <span class="idiff left right">• In the type family declaration for</span> ‘B’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/83187784fac82b6e8db016cc68e4d8ae07c83856#06967bf4eda1dcb434bb05e9373aa8fa3a467f22"><strong>testsuite/tests/th/T15362.hs</strong></a>
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<pre style="margin: 0;">-<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE TemplateHaskell, TypeOperators, DataKinds #-}</span></span>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE TemplateHaskell, TypeOperators, DataKinds<span class="idiff left right">, TypeFamilies</span> #-}</span></span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T15362</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/83187784fac82b6e8db016cc68e4d8ae07c83856#fdc37038d819f2be8ce66bff83a7928c120c7455"><strong>testsuite/tests/th/T15362.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC2" class="line" lang="plaintext">T15362.hs:<span class="idiff left right">8:10</span>: error:</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T15362.hs:<span class="idiff left right">7:2</span>: error:</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> • Mismatched type name in type family instance.</span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"> Expected: +</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> Actual: Maybe</span>
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext"> In the declaration for type family ‘+’</span>
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<pre style="margin: 0;">-<span id="LC7" class="line" lang="plaintext"> • In the Template Haskell quotation</span>
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<pre style="margin: 0;">-<span id="LC8" class="line" lang="plaintext"> [d| type family a + b where</span>
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<pre style="margin: 0;">-<span id="LC9" class="line" lang="plaintext"> Maybe Zero b = b</span>
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<pre style="margin: 0;">-<span id="LC10" class="line" lang="plaintext"> Succ a + b = Succ (a + b) |]</span></pre>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> • In the type family declaration for ‘+’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/83187784fac82b6e8db016cc68e4d8ae07c83856#36df27be7e981d8004e9dc3a6fb728f175e5b374"><strong>testsuite/tests/typecheck/should_fail/T11623.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">T11623.hs:5:23: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> Mismatched type name in type family instance.</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> Expected: T</span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> Actual: Maybe</span>
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext"> In the declaration for type family ‘T’</span></pre>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Number of parameters must match family declaration; expected 0</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> • In the type family declaration for ‘T’</span></pre>
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