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<h3>
Marge Bot pushed to branch master
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/22f218b729a751bc5e5965624a716fc542f502a5">22f218b7</a></strong>
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<span>by Krzysztof Gogolewski</span>
<i>at 2020-10-10T14:50:42-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Linear types: fix quantification in GADTs (#18790)
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<h4>3 changed files:</h4>
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<a href="#892acbb198a9095c917740d3c1297b56df4e3b7e">
compiler/GHC/Rename/HsType.hs
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<a href="#7dd1cd0f6f2164a14c83d9aa564dd32bc30e447a">
compiler/GHC/Rename/Module.hs
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testsuite/tests/linear/should_compile/MultConstructor.hs
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<h4>Changes:</h4>
<li id="892acbb198a9095c917740d3c1297b56df4e3b7e">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/22f218b729a751bc5e5965624a716fc542f502a5#892acbb198a9095c917740d3c1297b56df4e3b7e"><strong>compiler/GHC/Rename/HsType.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -31,6 +31,7 @@ module GHC.Rename.HsType (</td>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">extractHsTyRdrTyVars</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">extractHsTyRdrTyVarsKindVars</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">extractHsTysRdrTyVars</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">extractRdrKindSigVars</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">extractDataDefnKindVars</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">extractHsTvBndrs</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">extractHsTyArgRdrKiTyVars</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">extractHsScaledTysRdrTyVars</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">forAllOrNothing</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">nubL</span></span>
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<pre style="margin: 0;"> <span id="LC36" 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="LC37" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1749" 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">@@ -1748,6 +1749,9 @@ extractHsTyArgRdrKiTyVars args</td>
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1748
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<pre style="margin: 0;"> <span id="LC1749" class="line" lang="haskell"><span class="n" style="color: #333;">extractHsTyRdrTyVars</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars</span></span>
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<pre style="margin: 0;"> <span id="LC1750" class="line" lang="haskell"><span class="n" style="color: #333;">extractHsTyRdrTyVars</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extract_lty</span> <span class="n" style="color: #333;">ty</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;"> <span id="LC1751" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1752" class="line" lang="haskell"><span class="n" style="color: #333;">extractHsScaledTysRdrTyVars</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">HsScaled</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsType</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;">FreeKiTyVars</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars</span></span>
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<pre style="margin: 0;">+<span id="LC1753" class="line" lang="haskell"><span class="n" style="color: #333;">extractHsScaledTysRdrTyVars</span> <span class="n" style="color: #333;">args</span> <span class="n" style="color: #333;">acc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsScaled</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">extract_lty</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">extract_hs_arrow</span> <span class="n" style="color: #333;">m</span><span class="p">)</span> <span class="n" style="color: #333;">acc</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">+<span id="LC1754" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1755" class="line" lang="haskell"><span class="cd">-- | Extracts the free type/kind variables from the kind signature of a HsType.</span></span>
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<pre style="margin: 0;"> <span id="LC1756" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This is used to implicitly quantify over @k@ in @type T = Nothing :: Maybe k@.</span></span>
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<pre style="margin: 0;"> <span id="LC1757" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The left-to-right order of variables is preserved.</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">@@ -1764,8 +1768,8 @@ extractHsTyRdrTyVarsKindVars (L _ ty) =</td>
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<pre style="margin: 0;"> <span id="LC1768" class="line" lang="haskell"><span class="cd">-- | Extracts free type and kind variables from types in a list.</span></span>
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<pre style="margin: 0;"> <span id="LC1769" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- When the same name occurs multiple times in the types, all occurrences</span></span>
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1770
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<pre style="margin: 0;"> <span id="LC1770" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- are returned.</span></span>
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<pre style="margin: 0;">-<span id="LC1767" class="line" lang="haskell"><span class="n" style="color: #333;">extractHsTysRdrTyVars</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LHsType</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;">FreeKiTyVars</span></span>
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1768
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<pre style="margin: 0;">-<span id="LC1768" class="line" lang="haskell"><span class="n" style="color: #333;">extractHsTysRdrTyVars</span> <span class="n" style="color: #333;">tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extract_ltys</span> <span class="n" style="color: #333;">tys</span><span class="idiff left"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">[]</span></span></span>
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1771
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<pre style="margin: 0;">+<span id="LC1771" class="line" lang="haskell"><span class="n" style="color: #333;">extractHsTysRdrTyVars</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LHsType</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;">FreeKiTyVars</span><span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">FreeKiTyVars</span></span></span>
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1772
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<pre style="margin: 0;">+<span id="LC1772" class="line" lang="haskell"><span class="n" style="color: #333;">extractHsTysRdrTyVars</span> <span class="n" style="color: #333;">tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extract_ltys</span> <span class="n" style="color: #333;">tys</span></span>
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1773
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<pre style="margin: 0;"> <span id="LC1773" class="line" lang="haskell"></span>
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1774
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<pre style="margin: 0;"> <span id="LC1774" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns the free kind variables of any explicitly-kinded binders, returning</span></span>
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1775
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<pre style="margin: 0;"> <span id="LC1775" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- variable occurrences in left-to-right order.</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/22f218b729a751bc5e5965624a716fc542f502a5#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">@@ -2213,7 +2213,9 @@ rnConDecl decl@(ConDeclGADT { con_names = names</td>
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2213
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<pre style="margin: 0;"> <span id="LC2213" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See #14808.</span></span>
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<pre style="margin: 0;"> <span id="LC2214" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">implicit_bndrs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">forAllOrNothing</span> <span class="n" style="color: #333;">explicit_forall</span></span>
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<pre style="margin: 0;"> <span id="LC2215" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">extractHsTvBndrs</span> <span class="n" style="color: #333;">explicit_tkvs</span></span>
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2216
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<pre style="margin: 0;">-<span id="LC2216" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">extractHsTysRdrTyVars</span> <span class="p">(</span><span class="n" style="color: #333;">theta</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">hsScaledThing</span> <span class="n" style="color: #333;">arg_tys</span> <span class="o" style="font-weight: 600;">++</span> <span class="p">[</span><span class="n" style="color: #333;">res_ty</span><span class="p">])</span></span>
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2216
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<pre style="margin: 0;">+<span id="LC2216" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">extractHsTysRdrTyVars</span> <span class="n" style="color: #333;">theta</span></span>
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<pre style="margin: 0;">+<span id="LC2217" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">extractHsScaledTysRdrTyVars</span> <span class="n" style="color: #333;">arg_tys</span></span>
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<pre style="margin: 0;">+<span id="LC2218" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">extractHsTysRdrTyVars</span> <span class="p">[</span><span class="n" style="color: #333;">res_ty</span><span class="p">]</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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2219
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<pre style="margin: 0;"> <span id="LC2219" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2220" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ConDeclCtx</span> <span class="n" style="color: #333;">new_names</span></span>
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<pre style="margin: 0;"> <span id="LC2221" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/22f218b729a751bc5e5965624a716fc542f502a5#ceb923770fc29070d2688d32cc01fa98fd5c0835"><strong>testsuite/tests/linear/should_compile/MultConstructor.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 GADT<span class="idiff left right">Syntax, DataKinds, LinearTypes, KindSignatures, ExplicitForAll</span> #-}</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 GADT<span class="idiff left right">s, DataKinds, LinearTypes, KindSignatures, ExplicitForAll, TypeApplications</span> #-}</span></span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">MultConstructor</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types</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">@@ -6,8 +6,23 @@ import GHC.Types</td>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">a</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MkT</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">%</span><span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC9" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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<pre style="margin: 0;">-<span id="LC10" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">this currently fails</span></span>
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<pre style="margin: 0;">-<span id="LC11" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">g :: forall (b :: Type). T 'Many b %1 -> (b,b)</span></span>
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<pre style="margin: 0;">-<span id="LC12" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">g (MkT x) = (x,x)</span></span>
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<pre style="margin: 0;">-<span id="LC13" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span></pre>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Existential</span> <span class="n" style="color: #333;">a</span> <span class="kr" style="font-weight: 600;">where</span> <span class="c1" style="color: #998; font-style: italic;">-- #18790</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MkE</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">%</span><span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Existential</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="n" style="color: #333;">f1</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="kt" style="color: #458; font-weight: 600;">'Many</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">%</span><span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span><span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="n" style="color: #333;">f1</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MkT</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="p">,</span><span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="n" style="color: #333;">f2</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span> <span class="n" style="color: #333;">m</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="kt" style="color: #458; font-weight: 600;">'Many</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">%</span><span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"><span class="n" style="color: #333;">f2</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MkT</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkT</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"></span>
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18
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"><span class="n" style="color: #333;">f3</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span><span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">%</span><span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="kt" style="color: #458; font-weight: 600;">'One</span> <span class="n" style="color: #333;">a</span></span>
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<td class="diff-line-num new new_line" data-linenumber="19" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"><span class="n" style="color: #333;">f3</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkT</span></span>
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20
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"></span>
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21
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"><span class="n" style="color: #333;">g1</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span><span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">%</span><span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Existential</span> <span class="n" style="color: #333;">a</span></span>
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<td class="diff-line-num new new_line" data-linenumber="22" 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">
22
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"><span class="n" style="color: #333;">g1</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkE</span> <span class="n" style="color: #333;">x</span></span>
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23
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"><span class="n" style="color: #333;">g2</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">Existential</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span></span>
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25
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"><span class="n" style="color: #333;">g2</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MkE</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">x</span></span>
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26
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"></span>
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27
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"><span class="n" style="color: #333;">vta</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">%</span><span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Existential</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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28
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"><span class="n" style="color: #333;">vta</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkE</span> <span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">'One</span> <span class="n" style="color: #333;">x</span></span></pre>
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