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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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<ul>
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/583a2070f1ad9162a365b034b27c3b80daafb8df">583a2070</a></strong>
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<span>by Richard Eisenberg</span>
<i>at 2020-09-29T00:31:27-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Optimize NthCo (FunCo ...) in coercion opt
We were missing this case previously.
Close #18528.
Metric Decrease:
T18223
T5321Fun
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<h4>3 changed files:</h4>
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<a href="#8a5cd068459120cddf3814e7b9e02003b87647ba">
compiler/GHC/Builtin/Types/Prim.hs
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<a href="#783e5dae6e86931f06700fc088fb7d48c8a07386">
compiler/GHC/Core/Coercion.hs
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<a href="#975dc08a8e7942b32d621f617d5a9c1b668601dd">
compiler/GHC/Core/Coercion/Opt.hs
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<h4>Changes:</h4>
<li id="8a5cd068459120cddf3814e7b9e02003b87647ba">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/583a2070f1ad9162a365b034b27c3b80daafb8df#8a5cd068459120cddf3814e7b9e02003b87647ba"><strong>compiler/GHC/Builtin/Types/Prim.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="407" 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">@@ -407,8 +407,9 @@ funTyConName = mkPrimTyConName (fsLit "FUN") funTyConKey funTyCon</td>
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<pre style="margin: 0;"> <span id="LC407" class="line" lang="haskell"><span class="cd">-- | The @FUN@ type constructor.</span></span>
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<pre style="margin: 0;"> <span id="LC408" 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="LC409" 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="LC410" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- FUN :: forall {m :: Multiplicity} {rep1 :: RuntimeRep} {rep2 :: RuntimeRep}.</span></span>
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<pre style="margin: 0;">-<span id="LC411" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- TYPE rep1 -> TYPE rep2 -> *</span></span>
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<pre style="margin: 0;">+<span id="LC410" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- FUN :: forall (m :: Multiplicity) -></span></span>
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<pre style="margin: 0;">+<span id="LC411" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- forall {rep1 :: RuntimeRep} {rep2 :: RuntimeRep}.</span></span>
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<pre style="margin: 0;">+<span id="LC412" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- TYPE rep1 -> TYPE rep2 -> *</span></span>
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<pre style="margin: 0;"> <span id="LC413" 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="LC414" 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="LC415" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The runtime representations quantification is left inferred. This</span></span>
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<li id="783e5dae6e86931f06700fc088fb7d48c8a07386">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/583a2070f1ad9162a365b034b27c3b80daafb8df#783e5dae6e86931f06700fc088fb7d48c8a07386"><strong>compiler/GHC/Core/Coercion.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">@@ -32,7 +32,7 @@ module GHC.Core.Coercion (</td>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkAxInstLHS</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkUnbranchedAxInstLHS</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;">mkPiCo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkPiCos</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkCoCast</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;">mkSymCo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkTransCo</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;">mkNthCo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">nthCoRole</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkLRCo</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;">mkNthCo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left">mkNthCoFunCo</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff right"> </span><span class="nf" style="color: #900; font-weight: 600;">nthCoRole</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkLRCo</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkInstCo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkAppCo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkAppCos</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkTyConAppCo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkFunCo</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkForAllCo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkForAllCos</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkHomoForAllCos</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkPhantomCo</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">@@ -1052,23 +1052,8 @@ mkNthCo r n co</td>
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1052
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1052
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<pre style="margin: 0;"> <span id="LC1052" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If co :: (forall a1:t1 ~ t2. t1) ~ (forall a2:t3 ~ t4. t2)</span></span>
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1053
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1053
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<pre style="margin: 0;"> <span id="LC1053" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- then (nth 0 co :: (t1 ~ t2) ~N (t3 ~ t4))</span></span>
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1054
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1054
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<pre style="margin: 0;"> <span id="LC1054" class="line" lang="haskell"></span>
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1055
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<pre style="margin: 0;">-<span id="LC1055" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">co</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FunCo</span> <span class="n" style="color: #333;">r0</span> <span class="n" style="color: #333;">w</span> <span class="n" style="color: #333;">arg</span> <span class="n" style="color: #333;">res</span><span class="p">)</span></span>
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1056
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<pre style="margin: 0;">-<span id="LC1056" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Function coercions]</span></span>
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1057
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<pre style="margin: 0;">-<span id="LC1057" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If FunCo _ mult arg_co res_co :: (s1:TYPE sk1 :mult-> s2:TYPE sk2)</span></span>
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1058
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<pre style="margin: 0;">-<span id="LC1058" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ~ (t1:TYPE tk1 :mult-> t2:TYPE tk2)</span></span>
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1059
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<pre style="margin: 0;">-<span id="LC1059" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Then we want to behave as if co was</span></span>
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1060
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<pre style="margin: 0;">-<span id="LC1060" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- TyConAppCo mult argk_co resk_co arg_co res_co</span></span>
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1061
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<pre style="margin: 0;">-<span id="LC1061" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- where</span></span>
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1062
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<pre style="margin: 0;">-<span id="LC1062" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- argk_co :: sk1 ~ tk1 = mkNthCo 0 (mkKindCo arg_co)</span></span>
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1063
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<pre style="margin: 0;">-<span id="LC1063" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- resk_co :: sk2 ~ tk2 = mkNthCo 0 (mkKindCo res_co)</span></span>
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1064
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<pre style="margin: 0;">-<span id="LC1064" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- i.e. mkRuntimeRepCo</span></span>
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1065
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<pre style="margin: 0;">-<span id="LC1065" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">n</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1066
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<pre style="margin: 0;">-<span id="LC1066" class="line" lang="haskell"> <span class="mi" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="p">)</span> <span class="n" style="color: #333;">w</span></span>
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1067
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<pre style="margin: 0;">-<span id="LC1067" class="line" lang="haskell"> <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;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="p">)</span> <span class="n" style="color: #333;">mkRuntimeRepCo</span> <span class="n" style="color: #333;">arg</span></span>
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1068
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<pre style="margin: 0;">-<span id="LC1068" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="p">)</span> <span class="n" style="color: #333;">mkRuntimeRepCo</span> <span class="n" style="color: #333;">res</span></span>
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1069
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<pre style="margin: 0;">-<span id="LC1069" class="line" lang="haskell"> <span class="mi" style="color: #099;">3</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">r0</span> <span class="p">)</span> <span class="n" style="color: #333;">arg</span></span>
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1070
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<pre style="margin: 0;">-<span id="LC1070" class="line" lang="haskell"> <span class="mi" style="color: #099;">4</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">r0</span> <span class="p">)</span> <span class="n" style="color: #333;">res</span></span>
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1071
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<pre style="margin: 0;">-<span id="LC1071" 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;">pprPanic</span> <span class="s" style="color: #d14;">"mkNthCo(FunCo)"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>
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1055
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<pre style="margin: 0;">+<span id="LC1055" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">n</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FunCo</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">w</span> <span class="n" style="color: #333;">arg</span> <span class="n" style="color: #333;">res</span><span class="p">)</span></span>
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1056
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<pre style="margin: 0;">+<span id="LC1056" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkNthCoFunCo</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">w</span> <span class="n" style="color: #333;">arg</span> <span class="n" style="color: #333;">res</span></span>
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1072
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1057
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<pre style="margin: 0;"> <span id="LC1057" class="line" lang="haskell"></span>
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1073
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1058
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<pre style="margin: 0;"> <span id="LC1058" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">n</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyConAppCo</span> <span class="n" style="color: #333;">r0</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">arg_cos</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT2</span><span class="p">(</span> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">nthRole</span> <span class="n" style="color: #333;">r0</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">n</span></span>
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1059
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<pre style="margin: 0;"> <span id="LC1059" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><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;">tc</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">@@ -1120,7 +1105,28 @@ mkNthCo r n co</td>
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1120
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1105
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<pre style="margin: 0;"> <span id="LC1105" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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1121
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1106
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<pre style="margin: 0;"> <span id="LC1106" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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1122
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1107
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<pre style="margin: 0;"> <span id="LC1107" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1123" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1108" class="line" lang="haskell"><span class="cd">-- | Extract the nth field of a FunCo</span></span>
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<pre style="margin: 0;">+<span id="LC1109" class="line" lang="haskell"><span class="n" style="color: #333;">mkNthCoFunCo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ "n"</span></span>
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<pre style="margin: 0;">+<span id="LC1110" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoercionN</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ multiplicity coercion</span></span>
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1111
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<pre style="margin: 0;">+<span id="LC1111" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ argument coercion</span></span>
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<pre style="margin: 0;">+<span id="LC1112" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ result coercion</span></span>
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<pre style="margin: 0;">+<span id="LC1113" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ nth coercion from a FunCo</span></span>
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<pre style="margin: 0;">+<span id="LC1114" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Function coercions]</span></span>
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<pre style="margin: 0;">+<span id="LC1115" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If FunCo _ mult arg_co res_co :: (s1:TYPE sk1 :mult-> s2:TYPE sk2)</span></span>
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1116
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<pre style="margin: 0;">+<span id="LC1116" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ~ (t1:TYPE tk1 :mult-> t2:TYPE tk2)</span></span>
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1117
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<pre style="margin: 0;">+<span id="LC1117" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Then we want to behave as if co was</span></span>
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<pre style="margin: 0;">+<span id="LC1118" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- TyConAppCo mult argk_co resk_co arg_co res_co</span></span>
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1119
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<pre style="margin: 0;">+<span id="LC1119" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- where</span></span>
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<pre style="margin: 0;">+<span id="LC1120" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- argk_co :: sk1 ~ tk1 = mkNthCo 0 (mkKindCo arg_co)</span></span>
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1121
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<pre style="margin: 0;">+<span id="LC1121" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- resk_co :: sk2 ~ tk2 = mkNthCo 0 (mkKindCo res_co)</span></span>
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1122
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<pre style="margin: 0;">+<span id="LC1122" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- i.e. mkRuntimeRepCo</span></span>
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1123
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<pre style="margin: 0;">+<span id="LC1123" class="line" lang="haskell"><span class="n" style="color: #333;">mkNthCoFunCo</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">w</span> <span class="n" style="color: #333;">co1</span> <span class="n" style="color: #333;">co2</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">n</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1124
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<pre style="margin: 0;">+<span id="LC1124" class="line" lang="haskell"> <span class="mi" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">w</span></span>
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1125
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<pre style="margin: 0;">+<span id="LC1125" class="line" lang="haskell"> <span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mkRuntimeRepCo</span> <span class="n" style="color: #333;">co1</span></span>
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1126
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<pre style="margin: 0;">+<span id="LC1126" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mkRuntimeRepCo</span> <span class="n" style="color: #333;">co2</span></span>
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1127
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<pre style="margin: 0;">+<span id="LC1127" class="line" lang="haskell"> <span class="mi" style="color: #099;">3</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">co1</span></span>
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1128
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<pre style="margin: 0;">+<span id="LC1128" class="line" lang="haskell"> <span class="mi" style="color: #099;">4</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">co2</span></span>
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1129
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<pre style="margin: 0;">+<span id="LC1129" 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;">pprPanic</span> <span class="s" style="color: #d14;">"mkNthCo(FunCo)"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">w</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">co1</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">co2</span><span class="p">)</span></span>
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1130
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<pre style="margin: 0;"> <span id="LC1130" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1131" class="line" lang="haskell"><span class="cd">-- | If you're about to call @mkNthCo r n co@, then @r@ should be</span></span>
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1132
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<pre style="margin: 0;"> <span id="LC1132" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- whatever @nthCoRole n co@ returns.</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/583a2070f1ad9162a365b034b27c3b80daafb8df#975dc08a8e7942b32d621f617d5a9c1b668601dd"><strong>compiler/GHC/Core/Coercion/Opt.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">@@ -332,6 +332,7 @@ opt_co4 env _sym rep r (NthCo _r n co)</td>
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332
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332
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<pre style="margin: 0;"> <span id="LC332" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">_tc</span><span class="p">,</span> <span class="n" style="color: #333;">args</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">_r</span> <span class="p">)</span></span>
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333
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333
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<pre style="margin: 0;"> <span id="LC333" class="line" lang="haskell"> <span class="n" style="color: #333;">splitTyConApp_maybe</span> <span class="n" style="color: #333;">ty</span></span>
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334
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334
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<pre style="margin: 0;"> <span id="LC334" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">liftCoSubst</span> <span class="p">(</span><span class="n" style="color: #333;">chooseRole</span> <span class="n" style="color: #333;">rep</span> <span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="n" style="color: #333;">args</span> <span class="p">`</span><span class="n" style="color: #333;">getNth</span><span class="p">`</span> <span class="n" style="color: #333;">n</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC335" class="line" lang="haskell"></span>
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336
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<pre style="margin: 0;"> <span id="LC336" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">ty</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isReflCo_maybe</span> <span class="n" style="color: #333;">co</span></span>
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336
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337
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<pre style="margin: 0;"> <span id="LC337" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">==</span> <span class="mi" style="color: #099;">0</span></span>
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<pre style="margin: 0;"> <span id="LC338" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">tv</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitForAllTy_maybe</span> <span class="n" style="color: #333;">ty</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">@@ -342,6 +343,11 @@ opt_co4 env sym rep r (NthCo r1 n (TyConAppCo _ _ cos))</td>
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<pre style="margin: 0;"> <span id="LC343" 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;">r</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">r1</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC344" class="line" lang="haskell"> <span class="n" style="color: #333;">opt_co4_wrap</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">sym</span> <span class="n" style="color: #333;">rep</span> <span class="n" style="color: #333;">r</span> <span class="p">(</span><span class="n" style="color: #333;">cos</span> <span class="p">`</span><span class="n" style="color: #333;">getNth</span><span class="p">`</span> <span class="n" style="color: #333;">n</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC345" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC346" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- see the definition of GHC.Builtin.Types.Prim.funTyCon</span></span>
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<pre style="margin: 0;">+<span id="LC347" class="line" lang="haskell"><span class="n" style="color: #333;">opt_co4</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">sym</span> <span class="n" style="color: #333;">rep</span> <span class="n" style="color: #333;">r</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NthCo</span> <span class="n" style="color: #333;">r1</span> <span class="n" style="color: #333;">n</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FunCo</span> <span class="n" style="color: #333;">_r2</span> <span class="n" style="color: #333;">w</span> <span class="n" style="color: #333;">co1</span> <span class="n" style="color: #333;">co2</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC348" 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;">r</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">r1</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC349" class="line" lang="haskell"> <span class="n" style="color: #333;">opt_co4_wrap</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">sym</span> <span class="n" style="color: #333;">rep</span> <span class="n" style="color: #333;">r</span> <span class="p">(</span><span class="n" style="color: #333;">mkNthCoFunCo</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">w</span> <span class="n" style="color: #333;">co1</span> <span class="n" style="color: #333;">co2</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC350" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC351" class="line" lang="haskell"><span class="n" style="color: #333;">opt_co4</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">sym</span> <span class="n" style="color: #333;">rep</span> <span class="n" style="color: #333;">r</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NthCo</span> <span class="n" style="color: #333;">_r</span> <span class="n" style="color: #333;">n</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForAllCo</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">eta</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC352" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- works for both tyvar and covar</span></span>
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<pre style="margin: 0;"> <span id="LC353" 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;">r</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">_r</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">@@ -349,18 +355,16 @@ opt_co4 env sym rep r (NthCo _r n (ForAllCo _ eta _))</td>
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<pre style="margin: 0;"> <span id="LC355" class="line" lang="haskell"> <span class="n" style="color: #333;">opt_co4_wrap</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">sym</span> <span class="n" style="color: #333;">rep</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">eta</span></span>
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<pre style="margin: 0;"> <span id="LC356" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC357" class="line" lang="haskell"><span class="n" style="color: #333;">opt_co4</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">sym</span> <span class="n" style="color: #333;">rep</span> <span class="n" style="color: #333;">r</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NthCo</span> <span class="n" style="color: #333;">_r</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC352" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">TyConAppCo</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">cos</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">co'</span></span>
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<pre style="margin: 0;">-<span id="LC353" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">nth_co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cos</span> <span class="p">`</span><span class="n" style="color: #333;">getNth</span><span class="p">`</span> <span class="n" style="color: #333;">n</span></span>
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<pre style="margin: 0;">+<span id="LC358" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">nth_co</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">co'</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC359" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TyConAppCo</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">cos</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">cos</span> <span class="p">`</span><span class="n" style="color: #333;">getNth</span><span class="p">`</span> <span class="n" style="color: #333;">n</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC360" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">FunCo</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">w</span> <span class="n" style="color: #333;">co1</span> <span class="n" style="color: #333;">co2</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">mkNthCoFunCo</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">w</span> <span class="n" style="color: #333;">co1</span> <span class="n" style="color: #333;">co2</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC361" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ForAllCo</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">eta</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">eta</span></span>
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<pre style="margin: 0;">+<span id="LC362" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<pre style="margin: 0;"> <span id="LC363" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">rep</span> <span class="o" style="font-weight: 600;">&&</span> <span class="p">(</span><span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span><span class="p">)</span></span>
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355
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<pre style="margin: 0;"> <span id="LC364" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- keep propagating the SubCo</span></span>
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356
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<pre style="margin: 0;"> <span id="LC365" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">opt_co4_wrap</span> <span class="p">(</span><span class="n" style="color: #333;">zapLiftingContext</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">nth_co</span></span>
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<pre style="margin: 0;"> <span id="LC366" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">nth_co</span></span>
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<pre style="margin: 0;"> <span id="LC367" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC359" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ForAllCo</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">eta</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">co'</span></span>
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<pre style="margin: 0;">-<span id="LC360" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">rep</span></span>
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<pre style="margin: 0;">-<span id="LC361" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">opt_co4_wrap</span> <span class="p">(</span><span class="n" style="color: #333;">zapLiftingContext</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">eta</span></span>
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362
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<pre style="margin: 0;">-<span id="LC362" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">eta</span></span>
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<pre style="margin: 0;">-<span id="LC363" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC368" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;"> <span id="LC369" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wrapRole</span> <span class="n" style="color: #333;">rep</span> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">NthCo</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">co'</span></span>
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366
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<pre style="margin: 0;"> <span id="LC370" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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