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<h3>
Ben Gamari pushed to branch wip/zap-coercions
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/ab19a41efd30de35a04dbc40517442f7fb146b7b">ab19a41e</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-03-27T19:37:23-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix warnings
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f584d4092284fbc880fc4cfd6e219338645b0b7d">f584d409</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-03-27T19:37:51-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve documentation of Coercion
</pre>
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d56d669130fe16cd790b2c9948ea6535317ec9fb">d56d6691</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-03-27T19:38:11-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Handle mkNthCo of zapped coercions
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<h4>3 changed files:</h4>
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<a href="#783e5dae6e86931f06700fc088fb7d48c8a07386">
compiler/GHC/Core/Coercion.hs
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<a href="#b0ab2032bd0c006bb9cda1e5433173de35930f53">
compiler/GHC/Core/Coercion.hs-boot
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<a href="#578c7c3857d66d963736ff6742f3433a0e8d01b7">
compiler/GHC/Core/TyCo/Rep.hs
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<h4>Changes:</h4>
<li id="783e5dae6e86931f06700fc088fb7d48c8a07386">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/1e047402d6a59813461d7941338af6cfb574f252...d56d669130fe16cd790b2c9948ea6535317ec9fb#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">@@ -1069,6 +1069,16 @@ mkNthCo r n co</td>
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1069
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1069
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<pre style="margin: 0;"> <span id="LC1069" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">r</span> <span class="p">])</span> <span class="p">)</span></span>
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1070
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1070
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<pre style="margin: 0;"> <span id="LC1070" class="line" lang="haskell"> <span class="n" style="color: #333;">arg_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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1071
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1071
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<pre style="margin: 0;"> <span id="LC1071" class="line" lang="haskell"></span>
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1072
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<pre style="margin: 0;">+<span id="LC1072" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">r</span> <span class="mi" style="color: #099;">0</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;">UnivCo</span> <span class="n" style="color: #333;">prov</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span></span>
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1073
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<pre style="margin: 0;">+<span id="LC1073" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isForAllTy</span> <span class="n" style="color: #333;">ty1</span></span>
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1074
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<pre style="margin: 0;">+<span id="LC1074" 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;">isForAllTy</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span></span>
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1075
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<pre style="margin: 0;">+<span id="LC1075" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">UnivCo</span> <span class="n" style="color: #333;">prov</span> <span class="n" style="color: #333;">r</span> <span class="p">(</span><span class="n" style="color: #333;">typeKind</span> <span class="n" style="color: #333;">ty1</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">typeKind</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span></span>
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1076
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<pre style="margin: 0;">+<span id="LC1076" 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;">UnivCo</span> <span class="n" style="color: #333;">prov</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1077" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">ts1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitAppTys</span> <span class="n" style="color: #333;">ty1</span></span>
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<pre style="margin: 0;">+<span id="LC1078" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">ts2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitAppTys</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;">+<span id="LC1079" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT2</span><span class="p">(</span><span class="n" style="color: #333;">ts1</span> <span class="p">`</span><span class="n" style="color: #333;">lengthAtLeast</span><span class="p">`</span> <span class="n" style="color: #333;">succ</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">ts1</span> <span class="p">`</span><span class="n" style="color: #333;">lengthAtLeast</span><span class="p">`</span> <span class="n" style="color: #333;">succ</span> <span class="n" style="color: #333;">n</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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<pre style="margin: 0;">+<span id="LC1080" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">UnivCo</span> <span class="n" style="color: #333;">prov</span> <span class="n" style="color: #333;">r</span> <span class="p">(</span><span class="n" style="color: #333;">ts1</span> <span class="o" style="font-weight: 600;">!!</span> <span class="n" style="color: #333;">n</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">ts2</span> <span class="o" style="font-weight: 600;">!!</span> <span class="n" style="color: #333;">n</span><span class="p">)</span></span>
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1081
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<pre style="margin: 0;">+<span id="LC1081" class="line" lang="haskell"></span>
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1082
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<pre style="margin: 0;"> <span id="LC1082" 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>
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1073
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1083
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<pre style="margin: 0;"> <span id="LC1083" class="line" lang="haskell"> <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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1074
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1084
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<pre style="margin: 0;"> <span id="LC1084" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/1e047402d6a59813461d7941338af6cfb574f252...d56d669130fe16cd790b2c9948ea6535317ec9fb#b0ab2032bd0c006bb9cda1e5433173de35930f53"><strong>compiler/GHC/Core/Coercion.hs-boot</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">@@ -4,12 +4,11 @@ module GHC.Core.Coercion where</td>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GhcPrelude</span></span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">{-#</span> <span class="nn" style="color: #555;">SOURCE</span> <span class="o" style="font-weight: 600;">#-</span><span class="p">}</span> <span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Core</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">TyCo</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Rep</span></span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">{-#</span> <span class="nn" style="color: #555;">SOURCE</span> <span class="o" style="font-weight: 600;">#-</span><span class="p">}</span> <span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Core</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">TyCon</span></span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">BasicTypes</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">LeftOrRight</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Coercion.Axiom</span></span>
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<pre style="margin: 0;">-<span id="LC12" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCo.Rep</span><span class="idiff left"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">CoercionHole</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCo.Rep</span></span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Var</span></span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">VarSet</span></span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Pair</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/1e047402d6a59813461d7941338af6cfb574f252...d56d669130fe16cd790b2c9948ea6535317ec9fb#578c7c3857d66d963736ff6742f3433a0e8d01b7"><strong>compiler/GHC/Core/TyCo/Rep.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">@@ -1027,6 +1027,7 @@ data Coercion</td>
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<pre style="margin: 0;"> <span id="LC1027" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1028" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- These ones mirror the shape of types</span></span>
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<pre style="margin: 0;"> <span id="LC1029" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- Refl :: _ -> N</span></span>
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<pre style="margin: 0;">+<span id="LC1030" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Refl a :: a ~_N a</span></span>
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<pre style="margin: 0;"> <span id="LC1031" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Refl</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Refl invariant]</span></span>
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<pre style="margin: 0;"> <span id="LC1032" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Invariant: applications of (Refl T) to a bunch of identity coercions</span></span>
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<pre style="margin: 0;"> <span id="LC1033" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- always show up as Refl.</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">@@ -1041,6 +1042,7 @@ data Coercion</td>
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1041
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1042
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<pre style="margin: 0;"> <span id="LC1042" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Use (GRefl Representational ty MRefl), not (SubCo (Refl ty))</span></span>
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1042
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1043
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<pre style="margin: 0;"> <span id="LC1043" class="line" lang="haskell"></span>
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1043
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1044
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<pre style="margin: 0;"> <span id="LC1044" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- GRefl :: "e" -> _ -> Maybe N -> e</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1045" 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">
1045
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<pre style="margin: 0;">+<span id="LC1045" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- GRefl r a (Just r') :: a ~_r' a</span></span>
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1044
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1046
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<pre style="margin: 0;"> <span id="LC1046" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Generalized reflexive coercion]</span></span>
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1045
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1047
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<pre style="margin: 0;"> <span id="LC1047" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">GRefl</span> <span class="kt" style="color: #458; font-weight: 600;">Role</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="kt" style="color: #458; font-weight: 600;">MCoercionN</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Refl invariant]</span></span>
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1046
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1048
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<pre style="margin: 0;"> <span id="LC1048" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Use (Refl ty), not (GRefl Nominal ty MRefl)</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1052" 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">@@ -1050,6 +1052,8 @@ data Coercion</td>
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1050
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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;">-- Type constructors into Coercions</span></span>
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1051
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1053
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<pre style="margin: 0;"> <span id="LC1053" class="line" lang="haskell"></span>
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1052
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1054
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<pre style="margin: 0;"> <span id="LC1054" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- TyConAppCo :: "e" -> _ -> ?? -> e</span></span>
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1055
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<pre style="margin: 0;">+<span id="LC1055" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- TyConAppCo r tc [co1 :: a1 ~_r b1, ..., coN :: aN ~_r bN]</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;">-- :: (tc a1 ... aN ~_r tc b1 ... bN)</span></span>
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1053
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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;">-- See Note [TyConAppCo roles]</span></span>
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1054
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1058
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<pre style="margin: 0;"> <span id="LC1058" 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="kt" style="color: #458; font-weight: 600;">Role</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Coercion</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- lift TyConApp</span></span>
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1055
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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;">-- The TyCon is never a synonym;</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1063" 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">@@ -1059,13 +1063,20 @@ data Coercion</td>
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1059
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1063
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<pre style="margin: 0;"> <span id="LC1063" class="line" lang="haskell"></span>
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1060
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1064
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<pre style="margin: 0;"> <span id="LC1064" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">AppCo</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="kt" style="color: #458; font-weight: 600;">CoercionN</span> <span class="c1" style="color: #998; font-style: italic;">-- lift AppTy</span></span>
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1061
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1065
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<pre style="margin: 0;"> <span id="LC1065" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- AppCo :: e -> N -> e</span></span>
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1066
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<pre style="margin: 0;">+<span id="LC1066" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- AppCo (co1 :: a1 ~_r b1) (co2 :: a2 ~_N b2)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1067" 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">
1067
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<pre style="margin: 0;">+<span id="LC1067" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- :: (a1 a2) ~_r (b1 b2)</span></span>
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1062
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1068
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<pre style="margin: 0;"> <span id="LC1068" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1069" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Forall coercions]</span></span>
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1064
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<pre style="margin: 0;"> <span id="LC1070" 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="kt" style="color: #458; font-weight: 600;">TyCoVar</span> <span class="kt" style="color: #458; font-weight: 600;">KindCoercion</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span></span>
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1065
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<pre style="margin: 0;"> <span id="LC1071" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ForAllCo :: _ -> N -> e -> e</span></span>
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<pre style="margin: 0;">+<span id="LC1072" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ForAllCo v (kco :: k1 ~_N m1) (co :: a ~_r b)</span></span>
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1073
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<pre style="margin: 0;">+<span id="LC1073" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- :: (forall (v :: k1). a) ~_r (forall (v :: m1). b)</span></span>
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1066
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1074
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<pre style="margin: 0;"> <span id="LC1074" class="line" lang="haskell"></span>
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1067
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1075
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<pre style="margin: 0;"> <span id="LC1075" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">FunCo</span> <span class="kt" style="color: #458; font-weight: 600;">Role</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="c1" style="color: #998; font-style: italic;">-- lift FunTy</span></span>
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1068
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1076
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<pre style="margin: 0;"> <span id="LC1076" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- FunCo :: "e" -> e -> e -> e</span></span>
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1077
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<pre style="margin: 0;">+<span id="LC1077" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- FunCo r (co1 :: a1 ~_r b1) (co2 :: a2 ~_r b2)</span></span>
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1078
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<pre style="margin: 0;">+<span id="LC1078" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- :: (a1 -> a2) ~_r (b1 -> b2)</span></span>
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1079
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<pre style="margin: 0;">+<span id="LC1079" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1069
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<pre style="margin: 0;"> <span id="LC1080" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note: why doesn't FunCo have a AnonArgFlag, like FunTy?</span></span>
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<pre style="margin: 0;"> <span id="LC1081" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Because the AnonArgFlag has no impact on Core; it is only</span></span>
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1071
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1082
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<pre style="margin: 0;"> <span id="LC1082" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- there to guide implicit instantiation of Haskell source</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">@@ -1073,8 +1084,11 @@ data Coercion</td>
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<pre style="margin: 0;"> <span id="LC1084" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Core-only.</span></span>
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1085
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<pre style="margin: 0;"> <span id="LC1085" class="line" lang="haskell"></span>
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1086
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<pre style="margin: 0;"> <span id="LC1086" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- These are special</span></span>
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1076
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<pre style="margin: 0;">-<span id="LC1076" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">CoVarCo</span> <span class="kt" style="color: #458; font-weight: 600;">CoVar</span> <span class="c1" style="color: #998; font-style: italic;">-- :: _ -> (N or R)</span></span>
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<pre style="margin: 0;">-<span id="LC1077" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- result role depends on the tycon of the variable's type</span></span>
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<pre style="margin: 0;">+<span id="LC1087" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">CoVarCo</span> <span class="kt" style="color: #458; font-weight: 600;">CoVar</span></span>
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<pre style="margin: 0;">+<span id="LC1088" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- CoVarCo :: _ -> (N or R)</span></span>
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<pre style="margin: 0;">+<span id="LC1089" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- CoVarCo (v :: a ~_r b)</span></span>
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<pre style="margin: 0;">+<span id="LC1090" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- :: a ~_r b</span></span>
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1091
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<pre style="margin: 0;">+<span id="LC1091" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- result role depends on the tycon of the variable's type</span></span>
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1078
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1092
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<pre style="margin: 0;"> <span id="LC1092" class="line" lang="haskell"></span>
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1079
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1093
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<pre style="margin: 0;"> <span id="LC1093" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- AxiomInstCo :: e -> _ -> ?? -> e</span></span>
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1094
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<pre style="margin: 0;"> <span id="LC1094" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">AxiomInstCo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoAxiom</span> <span class="kt" style="color: #458; font-weight: 600;">Branched</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">BranchIndex</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Coercion</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">@@ -1094,11 +1108,20 @@ data Coercion</td>
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1094
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1108
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<pre style="margin: 0;"> <span id="LC1108" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">UnivCo</span> <span class="kt" style="color: #458; font-weight: 600;">UnivCoProvenance</span> <span class="kt" style="color: #458; font-weight: 600;">Role</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span></span>
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1095
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1109
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<pre style="margin: 0;"> <span id="LC1109" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- :: _ -> "e" -> _ -> _ -> e</span></span>
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1096
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1110
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<pre style="margin: 0;"> <span id="LC1110" class="line" lang="haskell"></span>
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1097
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<pre style="margin: 0;">-<span id="LC1097" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">SymCo</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="c1" style="color: #998; font-style: italic;">-- :: e -> e</span></span>
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1098
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<pre style="margin: 0;">-<span id="LC1098" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">TransCo</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="c1" style="color: #998; font-style: italic;">-- :: e -> e -> e</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;">SymCo</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span></span>
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1112
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<pre style="margin: 0;">+<span id="LC1112" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- SymCo :: e -> e</span></span>
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1113
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<pre style="margin: 0;">+<span id="LC1113" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- SymCo (co :: a ~_r b)</span></span>
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1114
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<pre style="margin: 0;">+<span id="LC1114" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- :: b ~_r a</span></span>
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1115
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<pre style="margin: 0;">+<span id="LC1115" class="line" lang="haskell"></span>
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1116
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<pre style="margin: 0;">+<span id="LC1116" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">TransCo</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</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;">-- TransCo :: e -> e -> e</span></span>
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1118
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<pre style="margin: 0;">+<span id="LC1118" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- TransCo (co1 :: a ~_r b) (co2 :: b ~_r c)</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;">-- :: a ~_r c</span></span>
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1099
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1120
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<pre style="margin: 0;"> <span id="LC1120" class="line" lang="haskell"></span>
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1100
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1121
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<pre style="margin: 0;"> <span id="LC1121" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">NthCo</span> <span class="kt" style="color: #458; font-weight: 600;">Role</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="c1" style="color: #998; font-style: italic;">-- Zero-indexed; decomposes (T t0 ... tn)</span></span>
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1101
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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;">-- :: "e" -> _ -> e0 -> e (inverse of TyConAppCo, see Note [TyConAppCo roles])</span></span>
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1123
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<pre style="margin: 0;">+<span id="LC1123" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NthCo r i (co :: (T t_0 ... t_n) ~_r (U u_1 ... u_n)</span></span>
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1124
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<pre style="margin: 0;">+<span id="LC1124" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- :: t_i ~_r u_i</span></span>
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1102
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1125
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<pre style="margin: 0;"> <span id="LC1125" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Using NthCo on a ForAllCo gives an N coercion always</span></span>
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1103
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1126
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<pre style="margin: 0;"> <span id="LC1126" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [NthCo and newtypes]</span></span>
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1104
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1127
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<pre style="margin: 0;"> <span id="LC1127" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1131" 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">@@ -1108,17 +1131,26 @@ data Coercion</td>
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1108
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1131
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<pre style="margin: 0;"> <span id="LC1131" class="line" lang="haskell"></span>
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1109
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<td class="diff-line-num new_line" data-linenumber="1132" 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">
1132
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<pre style="margin: 0;"> <span id="LC1132" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">LRCo</span> <span class="kt" style="color: #458; font-weight: 600;">LeftOrRight</span> <span class="kt" style="color: #458; font-weight: 600;">CoercionN</span> <span class="c1" style="color: #998; font-style: italic;">-- Decomposes (t_left t_right)</span></span>
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1110
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<td class="diff-line-num new_line" data-linenumber="1133" 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">
1133
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<pre style="margin: 0;"> <span id="LC1133" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- :: _ -> N -> N</span></span>
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1134
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<pre style="margin: 0;">+<span id="LC1134" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- LRCo Left (co :: (a1 b1 ~_r a2 b2))</span></span>
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1135
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<pre style="margin: 0;">+<span id="LC1135" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- :: a1 ~_r a2</span></span>
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1111
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1136
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<pre style="margin: 0;"> <span id="LC1136" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">InstCo</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="kt" style="color: #458; font-weight: 600;">CoercionN</span></span>
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1112
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1137
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<pre style="margin: 0;"> <span id="LC1137" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- :: e -> N -> e</span></span>
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1138
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<pre style="margin: 0;">+<span id="LC1138" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- InstCo (co1 :: forall (a1::k). b1 ~_r forall (a2::k). b2))</span></span>
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1139
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<pre style="margin: 0;">+<span id="LC1139" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (co2 :: k ~_N k')</span></span>
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1140
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<pre style="margin: 0;">+<span id="LC1140" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- :: b1 (a |-> 1) ~_r b2 (a2 |-> s2)</span></span>
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1113
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1141
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<pre style="margin: 0;"> <span id="LC1141" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [InstCo roles]</span></span>
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1114
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1142
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<pre style="margin: 0;"> <span id="LC1142" class="line" lang="haskell"></span>
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1115
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1143
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<pre style="margin: 0;"> <span id="LC1143" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Extract a kind coercion from a (heterogeneous) type coercion</span></span>
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1116
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1144
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<pre style="margin: 0;"> <span id="LC1144" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: all kind coercions are Nominal</span></span>
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1117
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1145
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<pre style="margin: 0;"> <span id="LC1145" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">KindCo</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span></span>
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1118
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1146
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<pre style="margin: 0;"> <span id="LC1146" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- :: e -> N</span></span>
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1147
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<pre style="margin: 0;">+<span id="LC1147" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- KindCo (co :: ((a1 :: k1) ~_r (a2 :: k2)))</span></span>
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1148
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<pre style="margin: 0;">+<span id="LC1148" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- :: k1 ~_N k2</span></span>
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<td class="diff-line-num old_line" data-linenumber="1119" 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">
1119
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1149
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<pre style="margin: 0;"> <span id="LC1149" class="line" lang="haskell"></span>
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<td class="diff-line-num old_line" data-linenumber="1120" 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">
1120
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1150
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<pre style="margin: 0;"> <span id="LC1150" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">SubCo</span> <span class="kt" style="color: #458; font-weight: 600;">CoercionN</span> <span class="c1" style="color: #998; font-style: italic;">-- Turns a ~N into a ~R</span></span>
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<td class="diff-line-num old_line" data-linenumber="1121" 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">
1121
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1151
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<pre style="margin: 0;"> <span id="LC1151" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- :: N -> R</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1152" 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">
1152
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<pre style="margin: 0;">+<span id="LC1152" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- SubCo (co :: (a ~_N b))</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1153" 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">
1153
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<pre style="margin: 0;">+<span id="LC1153" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- :: a ~_R b</span></span>
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1122
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1154
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<pre style="margin: 0;"> <span id="LC1154" class="line" lang="haskell"></span>
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<td class="diff-line-num old_line" data-linenumber="1123" 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">
1123
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1155
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<pre style="margin: 0;"> <span id="LC1155" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">HoleCo</span> <span class="kt" style="color: #458; font-weight: 600;">CoercionHole</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ See Note [Coercion holes]</span></span>
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1124
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1156
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<pre style="margin: 0;"> <span id="LC1156" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Only present during typechecking</span></span>
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