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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/ea7f96de6f492a82564b0633152a895b9408c15f">ea7f96de</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-11T19:27:48Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Coercion zapping
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<h4>20 changed files:</h4>
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<li class="file-stats">
<a href="#2244d97c05d097e829284d1626470d05c932b8ad">
compiler/basicTypes/VarSet.hs
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<li class="file-stats">
<a href="#e07dd2ff12951ad05d87be9864df0968d7b7ede5">
compiler/coreSyn/CoreFVs.hs
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<a href="#da5742c4b404a672740f0eef71683f5a8dd3818e">
compiler/coreSyn/CoreLint.hs
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<li class="file-stats">
<a href="#e490c36ec7f7613a5fed65673bdb615286ba6207">
compiler/coreSyn/CoreOpt.hs
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<li class="file-stats">
<a href="#350a9fd002c83abb7e50d2569480278ec74733dc">
compiler/iface/IfaceEnv.hs
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<a href="#09d8bceab47b805883c4f6a95dcc944b6aa989af">
compiler/iface/IfaceSyn.hs
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<a href="#00cc4cf327870c80c12809fcd939c8b3ad54c12b">
compiler/iface/IfaceType.hs
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<a href="#65bf71dadcbedb56ff9b0d3c7ed1ddb8e7d27ab2">
compiler/iface/TcIface.hs
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compiler/iface/ToIface.hs
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<a href="#11e9bfd841c4163c1919b5e07efc84740e02010f">
compiler/main/DynFlags.hs
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<a href="#1b594d79ffc66b4bbbefcc4dccef85df99efbb84">
compiler/typecheck/TcFlatten.hs
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<a href="#350c4076427c611b8f14e875a4ca553041c2b847">
compiler/typecheck/TcHsType.hs
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<a href="#9bf2a6096cb14bc07c1c4cdd8299cfd75ed78650">
compiler/typecheck/TcTyDecls.hs
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<a href="#341fd962c5f2c9fcf8be3dbdaa9a14ee1538af07">
compiler/typecheck/TcType.hs
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<a href="#8cd24482c6f44f6736157718a50265828b6b7436">
compiler/types/Coercion.hs
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<a href="#243f518105cdb34e9b3345383e6293bc1d77b683">
compiler/types/Coercion.hs-boot
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<a href="#650f968dabaaf0f93c1caa167d85c981c45e3fc1">
compiler/types/FamInstEnv.hs
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<a href="#67a2fcd4f9dc88c950d518e4d2a458bd4228414f">
compiler/types/OptCoercion.hs
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<a href="#88310e11ff3891efda62ffaa54c2830f1b147778">
compiler/types/TyCoRep.hs
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<a href="#07ce9a046fb8ea6659690020b0a8551d94cfdf1c">
compiler/types/Type.hs
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<h4>Changes:</h4>
<li id="2244d97c05d097e829284d1626470d05c932b8ad">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/ea7f96de6f492a82564b0633152a895b9408c15f#2244d97c05d097e829284d1626470d05c932b8ad"><strong>compiler/basicTypes/VarSet.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="25" 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">@@ -25,7 +25,7 @@ module VarSet (</td>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">pluralVarSet</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pprVarSet</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * Deterministic Var set types</span></span>
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<pre style="margin: 0;">-<span id="LC28" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DVarSet</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">DIdSet</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">DTyVarSet</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">DTyCoVarSet</span><span class="p">,</span></span>
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<td class="diff-line-num new new_line" data-linenumber="28" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DVarSet</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">DIdSet</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">DTyVarSet</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">D<span class="idiff left">CoVarSet</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">D</span>TyCoVarSet</span><span class="p">,</span></span>
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<td class="diff-line-num old_line" data-linenumber="29" 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">
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ** Manipulating these sets</span></span>
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<td class="diff-line-num old_line" data-linenumber="31" 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">
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">emptyDVarSet</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">unitDVarSet</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkDVarSet</span><span class="p">,</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="225" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="225" 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">@@ -225,6 +225,9 @@ type DIdSet = UniqDSet Id</td>
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<pre style="margin: 0;"> <span id="LC225" class="line" lang="haskell"><span class="cd">-- | Deterministic Type Variable Set</span></span>
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<pre style="margin: 0;"> <span id="LC226" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">DTyVarSet</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">UniqDSet</span> <span class="kt" style="color: #458; font-weight: 600;">TyVar</span></span>
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<pre style="margin: 0;"> <span id="LC227" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC228" class="line" lang="haskell"><span class="cd">-- | Deterministic Coercion Variable Set</span></span>
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<pre style="margin: 0;">+<span id="LC229" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">DCoVarSet</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">UniqDSet</span> <span class="kt" style="color: #458; font-weight: 600;">CoVar</span></span>
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<pre style="margin: 0;">+<span id="LC230" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC231" class="line" lang="haskell"><span class="cd">-- | Deterministic Type or Coercion Variable Set</span></span>
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<pre style="margin: 0;"> <span id="LC232" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">DTyCoVarSet</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">UniqDSet</span> <span class="kt" style="color: #458; font-weight: 600;">TyCoVar</span></span>
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<pre style="margin: 0;"> <span id="LC233" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -396,6 +396,9 @@ orphNamesOfProv UnsafeCoerceProv = emptyNameSet</td>
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<pre style="margin: 0;"> <span id="LC396" class="line" lang="haskell"><span class="n" style="color: #333;">orphNamesOfProv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PhantomProv</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">orphNamesOfCo</span> <span class="n" style="color: #333;">co</span></span>
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<pre style="margin: 0;"> <span id="LC397" class="line" lang="haskell"><span class="n" style="color: #333;">orphNamesOfProv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ProofIrrelProv</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">orphNamesOfCo</span> <span class="n" style="color: #333;">co</span></span>
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<pre style="margin: 0;"> <span id="LC398" class="line" lang="haskell"><span class="n" style="color: #333;">orphNamesOfProv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PluginProv</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;">emptyNameSet</span></span>
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<pre style="margin: 0;">+<span id="LC399" class="line" lang="haskell"><span class="n" style="color: #333;">orphNamesOfProv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ZappedProv</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;">emptyNameSet</span></span>
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<pre style="margin: 0;">+<span id="LC400" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- [ZappedCoDifference] Zapped coercions refer to no orphan names, even if the</span></span>
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<pre style="margin: 0;">+<span id="LC401" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- original contained such names.</span></span>
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<pre style="margin: 0;"> <span id="LC402" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC403" class="line" lang="haskell"><span class="n" style="color: #333;">orphNamesOfCos</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Coercion</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">NameSet</span></span>
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<pre style="margin: 0;"> <span id="LC404" class="line" lang="haskell"><span class="n" style="color: #333;">orphNamesOfCos</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">orphNamesOfThings</span> <span class="n" style="color: #333;">orphNamesOfCo</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/ea7f96de6f492a82564b0633152a895b9408c15f#da5742c4b404a672740f0eef71683f5a8dd3818e"><strong>compiler/coreSyn/CoreLint.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">@@ -1788,6 +1788,7 @@ lintCoercion co@(UnivCo prov r ty1 ty2)</td>
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<pre style="margin: 0;"> <span id="LC1788" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">check_kinds</span> <span class="n" style="color: #333;">kco</span> <span class="n" style="color: #333;">k1</span> <span class="n" style="color: #333;">k2</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1789" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1790" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PluginProv</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span> <span class="c1" style="color: #998; font-style: italic;">-- no extra checks</span></span>
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<pre style="margin: 0;">+<span id="LC1791" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ZappedProv</span> <span class="n" style="color: #333;">fvs</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mapM_</span> <span class="n" style="color: #333;">lintTyCoVarInScope</span> <span class="p">(</span><span class="n" style="color: #333;">dVarSetElems</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1792" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1793" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">when</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;">Phantom</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">classifiesTypeWithValues</span> <span class="n" style="color: #333;">k1</span></span>
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<pre style="margin: 0;"> <span id="LC1794" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">classifiesTypeWithValues</span> <span class="n" style="color: #333;">k2</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">@@ -2014,7 +2015,6 @@ lintCoercion (HoleCo h)</td>
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<pre style="margin: 0;"> <span id="LC2015" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">addErrL</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Unfilled coercion hole:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">h</span></span>
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<pre style="margin: 0;"> <span id="LC2016" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">lintCoercion</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoVarCo</span> <span class="p">(</span><span class="n" style="color: #333;">coHoleCoVar</span> <span class="n" style="color: #333;">h</span><span class="p">))</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC2017" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2017" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2018" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">----------</span></span>
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<pre style="margin: 0;"> <span id="LC2019" class="line" lang="haskell"><span class="n" style="color: #333;">lintUnliftedCoVar</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CoVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LintM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC2020" class="line" lang="haskell"><span class="n" style="color: #333;">lintUnliftedCoVar</span> <span class="n" style="color: #333;">cv</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/ea7f96de6f492a82564b0633152a895b9408c15f#e490c36ec7f7613a5fed65673bdb615286ba6207"><strong>compiler/coreSyn/CoreOpt.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">@@ -1200,13 +1200,15 @@ pushCoTyArg co ty</td>
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<pre style="margin: 0;"> <span id="LC1200" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- tyL = forall (a1 :: k1). ty1</span></span>
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<pre style="margin: 0;"> <span id="LC1201" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- tyR = forall (a2 :: k2). ty2</span></span>
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<pre style="margin: 0;"> <span id="LC1202" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1203" class="line" lang="haskell"> <span class="n" style="color: #333;">co1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkSymCo</span> <span class="p">(</span><span class="n" style="color: #333;">mkNthCo</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="mi" style="color: #099;">0</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1203" class="line" lang="haskell"> <span class="n" style="color: #333;">zap</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">zapCoercion</span> <span class="n" style="color: #333;">unsafeGlobalDynFlags</span></span>
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1204
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<pre style="margin: 0;">+<span id="LC1204" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1205" class="line" lang="haskell"> <span class="n" style="color: #333;">co1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">zap</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkSymCo</span> <span class="p">(</span><span class="n" style="color: #333;">mkNthCo</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="mi" style="color: #099;">0</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1206" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- co1 :: k2 ~N k1</span></span>
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<pre style="margin: 0;"> <span id="LC1207" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note that NthCo can extract a Nominal equality between the</span></span>
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<pre style="margin: 0;"> <span id="LC1208" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- kinds of the types related by a coercion between forall-types.</span></span>
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<pre style="margin: 0;"> <span id="LC1209" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See the NthCo case in CoreLint.</span></span>
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<pre style="margin: 0;"> <span id="LC1210" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1209" class="line" lang="haskell"> <span class="n" style="color: #333;">co2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkInstCo</span> <span class="n" style="color: #333;">co</span> <span class="p">(</span><span class="n" style="color: #333;">mkGReflLeftCo</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">co1</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1211" class="line" lang="haskell"> <span class="n" style="color: #333;">co2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left">zap</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">mkInstCo</span> <span class="n" style="color: #333;">co</span> <span class="p">(</span><span class="n" style="color: #333;">mkGReflLeftCo</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">co1</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1212" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- co2 :: ty1[ (ty|>co1)/a1 ] ~ ty2[ ty/a2 ]</span></span>
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<pre style="margin: 0;"> <span id="LC1213" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Arg of mkInstCo is always nominal, hence mkNomReflCo</span></span>
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<pre style="margin: 0;"> <span id="LC1214" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/ea7f96de6f492a82564b0633152a895b9408c15f#350a9fd002c83abb7e50d2569480278ec74733dc"><strong>compiler/iface/IfaceEnv.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">@@ -226,7 +226,7 @@ tcIfaceLclId occ</td>
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<pre style="margin: 0;"> <span id="LC226" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">lcl</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getLclEnv</span></span>
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<pre style="margin: 0;"> <span id="LC227" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="p">(</span><span class="n" style="color: #333;">lookupFsEnv</span> <span class="p">(</span><span class="n" style="color: #333;">if_id_env</span> <span class="n" style="color: #333;">lcl</span><span class="p">)</span> <span class="n" style="color: #333;">occ</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC228" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">ty_var</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">ty_var</span></span>
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229
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<pre style="margin: 0;">-<span id="LC229" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">failIfM</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Iface id out of scope: "</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">occ</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC229" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">failIfM</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Iface id out of scope: "</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">occ</span><span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$$</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">if_id_env</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">lcl</span></span><span class="p"><span class="idiff right">)</span>)</span></span>
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<pre style="margin: 0;"> <span id="LC230" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC231" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC232" class="line" lang="haskell"><span class="n" style="color: #333;">extendIfaceIdEnv</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IfL</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IfL</span> <span class="n" style="color: #333;">a</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/ea7f96de6f492a82564b0633152a895b9408c15f#09d8bceab47b805883c4f6a95dcc944b6aa989af"><strong>compiler/iface/IfaceSyn.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">@@ -1530,6 +1530,9 @@ freeNamesIfProv IfaceUnsafeCoerceProv = emptyNameSet</td>
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1530
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<pre style="margin: 0;"> <span id="LC1530" class="line" lang="haskell"><span class="n" style="color: #333;">freeNamesIfProv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IfacePhantomProv</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">freeNamesIfCoercion</span> <span class="n" style="color: #333;">co</span></span>
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1531
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1531
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<pre style="margin: 0;"> <span id="LC1531" class="line" lang="haskell"><span class="n" style="color: #333;">freeNamesIfProv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IfaceProofIrrelProv</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">freeNamesIfCoercion</span> <span class="n" style="color: #333;">co</span></span>
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<pre style="margin: 0;"> <span id="LC1532" class="line" lang="haskell"><span class="n" style="color: #333;">freeNamesIfProv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IfacePluginProv</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;">emptyNameSet</span></span>
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<pre style="margin: 0;">+<span id="LC1533" class="line" lang="haskell"><span class="n" style="color: #333;">freeNamesIfProv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IfaceZappedProv</span> <span class="kr" style="font-weight: 600;">_</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;">emptyNameSet</span></span>
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<pre style="margin: 0;">+<span id="LC1534" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- [ZappedCoDifference]: This won't report top-level names present in the</span></span>
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<pre style="margin: 0;">+<span id="LC1535" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- unzapped proof but not its kind.</span></span>
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<pre style="margin: 0;"> <span id="LC1536" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1537" class="line" lang="haskell"><span class="n" style="color: #333;">freeNamesIfVarBndr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">VarBndr</span> <span class="kt" style="color: #458; font-weight: 600;">IfaceBndr</span> <span class="n" style="color: #333;">vis</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">NameSet</span></span>
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<pre style="margin: 0;"> <span id="LC1538" class="line" lang="haskell"><span class="n" style="color: #333;">freeNamesIfVarBndr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Bndr</span> <span class="n" style="color: #333;">bndr</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;">freeNamesIfBndr</span> <span class="n" style="color: #333;">bndr</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/ea7f96de6f492a82564b0633152a895b9408c15f#00cc4cf327870c80c12809fcd939c8b3ad54c12b"><strong>compiler/iface/IfaceType.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">@@ -335,6 +335,13 @@ data IfaceUnivCoProv</td>
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<pre style="margin: 0;"> <span id="LC335" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">IfacePhantomProv</span> <span class="kt" style="color: #458; font-weight: 600;">IfaceCoercion</span></span>
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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;">IfaceProofIrrelProv</span> <span class="kt" style="color: #458; font-weight: 600;">IfaceCoercion</span></span>
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<pre style="margin: 0;"> <span id="LC337" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">IfacePluginProv</span> <span class="kt" style="color: #458; font-weight: 600;">String</span></span>
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<pre style="margin: 0;">+<span id="LC338" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">IfaceZappedProv</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">IfLclName</span><span class="p">]</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoVar</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC339" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ @local cvs, free cvs@</span></span>
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<pre style="margin: 0;">+<span id="LC340" 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="LC341" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Local variables are those bound in the current IfaceType; free variables</span></span>
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<pre style="margin: 0;">+<span id="LC342" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- are used only when printing open types and are not serialised; see Note</span></span>
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<pre style="margin: 0;">+<span id="LC343" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- [Free tyvars in IfaceType].</span></span>
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<pre style="margin: 0;">+<span id="LC344" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Zapping coercions] in TyCoRep.</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="cm" style="color: #998; font-style: italic;">{- Note [Holes in IfaceCoercion]</span></span>
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<pre style="margin: 0;"> <span id="LC347" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -510,6 +517,9 @@ substIfaceType env ty</td>
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<pre style="margin: 0;"> <span id="LC517" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IfacePhantomProv</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IfacePhantomProv</span> <span class="p">(</span><span class="n" style="color: #333;">go_co</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>
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511
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<pre style="margin: 0;"> <span id="LC518" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IfaceProofIrrelProv</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IfaceProofIrrelProv</span> <span class="p">(</span><span class="n" style="color: #333;">go_co</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>
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512
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<pre style="margin: 0;"> <span id="LC519" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IfacePluginProv</span> <span class="n" style="color: #333;">str</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IfacePluginProv</span> <span class="n" style="color: #333;">str</span></span>
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<pre style="margin: 0;">+<span id="LC520" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IfaceZappedProv</span> <span class="n" style="color: #333;">cvs</span> <span class="n" style="color: #333;">fCvs</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC521" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IfaceZappedProv</span></span>
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<pre style="margin: 0;">+<span id="LC522" class="line" lang="haskell"> <span class="n" style="color: #333;">cvs</span> <span class="n" style="color: #333;">fCvs</span></span>
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<pre style="margin: 0;"> <span id="LC523" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC524" class="line" lang="haskell"><span class="n" style="color: #333;">substIfaceAppArgs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IfaceTySubst</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IfaceAppArgs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IfaceAppArgs</span></span>
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525
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<pre style="margin: 0;"> <span id="LC525" class="line" lang="haskell"><span class="n" style="color: #333;">substIfaceAppArgs</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">args</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1543" 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">@@ -1533,6 +1543,11 @@ pprIfaceUnivCoProv (IfaceProofIrrelProv co)</td>
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1533
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1543
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<pre style="margin: 0;"> <span id="LC1543" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"irrel"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pprParendIfaceCoercion</span> <span class="n" style="color: #333;">co</span></span>
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1534
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1544
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<pre style="margin: 0;"> <span id="LC1544" class="line" lang="haskell"><span class="n" style="color: #333;">pprIfaceUnivCoProv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IfacePluginProv</span> <span class="n" style="color: #333;">s</span><span class="p">)</span></span>
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1535
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1545
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<pre style="margin: 0;"> <span id="LC1545" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"plugin"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">doubleQuotes</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="n" style="color: #333;">s</span><span class="p">)</span></span>
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1546
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<pre style="margin: 0;">+<span id="LC1546" class="line" lang="haskell"><span class="n" style="color: #333;">pprIfaceUnivCoProv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IfaceZappedProv</span> <span class="n" style="color: #333;">cvs</span> <span class="n" style="color: #333;">fCvs</span><span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1547" 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">
1547
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<pre style="margin: 0;">+<span id="LC1547" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Zapped"</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">brackets</span> <span class="p">(</span><span class="n" style="color: #333;">whenPprDebug</span> <span class="n" style="color: #333;">fvsDoc</span><span class="p">)</span></span>
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1548
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<pre style="margin: 0;">+<span id="LC1548" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1549" 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">
1549
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<pre style="margin: 0;">+<span id="LC1549" class="line" lang="haskell"> <span class="n" style="color: #333;">fvsDoc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"free covars:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cvs</span></span>
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1550
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<pre style="margin: 0;">+<span id="LC1550" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"open free covars:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fCvs</span></span>
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1536
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1551
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<pre style="margin: 0;"> <span id="LC1551" class="line" lang="haskell"></span>
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1537
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1552
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<pre style="margin: 0;"> <span id="LC1552" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-------------------</span></span>
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1538
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1553
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<pre style="margin: 0;"> <span id="LC1553" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">IfaceTyCon</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1879" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1894" 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">@@ -1879,6 +1894,11 @@ instance Binary IfaceUnivCoProv where</td>
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1879
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1894
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<pre style="margin: 0;"> <span id="LC1894" class="line" lang="haskell"> <span class="n" style="color: #333;">put_</span> <span class="n" style="color: #333;">bh</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IfacePluginProv</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1880
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1895
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<pre style="margin: 0;"> <span id="LC1895" class="line" lang="haskell"> <span class="n" style="color: #333;">putByte</span> <span class="n" style="color: #333;">bh</span> <span class="mi" style="color: #099;">4</span></span>
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1881
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1896
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<pre style="margin: 0;"> <span id="LC1896" class="line" lang="haskell"> <span class="n" style="color: #333;">put_</span> <span class="n" style="color: #333;">bh</span> <span class="n" style="color: #333;">a</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1897" 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">
1897
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<pre style="margin: 0;">+<span id="LC1897" class="line" lang="haskell"> <span class="n" style="color: #333;">put_</span> <span class="n" style="color: #333;">bh</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IfaceZappedProv</span> <span class="n" style="color: #333;">coFvs</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1898
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<pre style="margin: 0;">+<span id="LC1898" class="line" lang="haskell"> <span class="n" style="color: #333;">putByte</span> <span class="n" style="color: #333;">bh</span> <span class="mi" style="color: #099;">5</span></span>
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1899
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<pre style="margin: 0;">+<span id="LC1899" class="line" lang="haskell"> <span class="n" style="color: #333;">put_</span> <span class="n" style="color: #333;">bh</span> <span class="n" style="color: #333;">coFvs</span></span>
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1900
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<pre style="margin: 0;">+<span id="LC1900" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- N.B. Free variables aren't serialised; see Note [Free tyvars in</span></span>
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1901
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<pre style="margin: 0;">+<span id="LC1901" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- IfaceType].</span></span>
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1882
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1902
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<pre style="margin: 0;"> <span id="LC1902" class="line" lang="haskell"></span>
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1883
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1903
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<pre style="margin: 0;"> <span id="LC1903" class="line" lang="haskell"> <span class="n" style="color: #333;">get</span> <span class="n" style="color: #333;">bh</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1884
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1904
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<pre style="margin: 0;"> <span id="LC1904" class="line" lang="haskell"> <span class="n" style="color: #333;">tag</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getByte</span> <span class="n" style="color: #333;">bh</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1910" 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">@@ -1890,6 +1910,10 @@ instance Binary IfaceUnivCoProv where</td>
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1890
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1910
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<pre style="margin: 0;"> <span id="LC1910" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">IfaceProofIrrelProv</span> <span class="n" style="color: #333;">a</span></span>
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1891
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1911
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<pre style="margin: 0;"> <span id="LC1911" class="line" lang="haskell"> <span class="mi" style="color: #099;">4</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">get</span> <span class="n" style="color: #333;">bh</span></span>
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1892
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1912
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<pre style="margin: 0;"> <span id="LC1912" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">IfacePluginProv</span> <span class="n" style="color: #333;">a</span></span>
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1913
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<pre style="margin: 0;">+<span id="LC1913" class="line" lang="haskell"> <span class="mi" style="color: #099;">5</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">get</span> <span class="n" style="color: #333;">bh</span></span>
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<pre style="margin: 0;">+<span id="LC1914" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- N.B. Free variables aren't serialised; see Note [Free</span></span>
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1915
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<pre style="margin: 0;">+<span id="LC1915" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- tyvars in IfaceType].</span></span>
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1916
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<pre style="margin: 0;">+<span id="LC1916" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">IfaceZappedProv</span> <span class="n" style="color: #333;">a</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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1917
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<pre style="margin: 0;"> <span id="LC1917" 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;">panic</span> <span class="p">(</span><span class="s" style="color: #d14;">"get IfaceUnivCoProv "</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">show</span> <span class="n" style="color: #333;">tag</span><span class="p">)</span></span>
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1894
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1918
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<pre style="margin: 0;"> <span id="LC1918" class="line" lang="haskell"></span>
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1919
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<pre style="margin: 0;"> <span id="LC1919" class="line" lang="haskell"></span>
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<li id="65bf71dadcbedb56ff9b0d3c7ed1ddb8e7d27ab2">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/ea7f96de6f492a82564b0633152a895b9408c15f#65bf71dadcbedb56ff9b0d3c7ed1ddb8e7d27ab2"><strong>compiler/iface/TcIface.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">@@ -1209,7 +1209,12 @@ tcIfaceTyLit (IfaceStrTyLit n) = return (StrTyLit n)</td>
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1209
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1209
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<pre style="margin: 0;"> <span id="LC1209" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1210
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1210
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<pre style="margin: 0;"> <span id="LC1210" class="line" lang="haskell"></span>
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1211
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1211
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<pre style="margin: 0;"> <span id="LC1211" class="line" lang="haskell"><span class="n" style="color: #333;">tcIfaceCo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IfaceCoercion</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IfL</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span></span>
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1212
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<pre style="margin: 0;">-<span id="LC1212" class="line" lang="haskell"><span class="n" style="color: #333;">tcIfaceCo</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span></span>
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<pre style="margin: 0;">+<span id="LC1212" class="line" lang="haskell"><span class="n" style="color: #333;">tcIfaceCo</span> <span class="o" style="font-weight: 600;">=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">co0</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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1213
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<pre style="margin: 0;">+<span id="LC1213" class="line" lang="haskell"> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getDynFlags</span></span>
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1214
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<pre style="margin: 0;">+<span id="LC1214" class="line" lang="haskell"> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">co0</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1215" 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">
1215
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<pre style="margin: 0;">+<span id="LC1215" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">shouldBuildCoercions</span> <span class="n" style="color: #333;">dflags</span></span>
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1216
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<pre style="margin: 0;">+<span id="LC1216" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">co</span></span>
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1217
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<pre style="margin: 0;">+<span id="LC1217" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">zapCoercion</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">co</span></span>
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1213
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1218
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<pre style="margin: 0;"> <span id="LC1218" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1214
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1219
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<pre style="margin: 0;"> <span id="LC1219" class="line" lang="haskell"> <span class="n" style="color: #333;">go_mco</span> <span class="kt" style="color: #458; font-weight: 600;">IfaceMRefl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">MRefl</span></span>
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1215
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1220
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<pre style="margin: 0;"> <span id="LC1220" class="line" lang="haskell"> <span class="n" style="color: #333;">go_mco</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IfaceMCo</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MCo</span> <span class="o" style="font-weight: 600;"><$></span> <span class="p">(</span><span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1250" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1250,6 +1255,7 @@ tcIfaceUnivCoProv IfaceUnsafeCoerceProv = return UnsafeCoerceProv</td>
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1250
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1255
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<pre style="margin: 0;"> <span id="LC1255" class="line" lang="haskell"><span class="n" style="color: #333;">tcIfaceUnivCoProv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IfacePhantomProv</span> <span class="n" style="color: #333;">kco</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PhantomProv</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">tcIfaceCo</span> <span class="n" style="color: #333;">kco</span></span>
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1251
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1256
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<pre style="margin: 0;"> <span id="LC1256" class="line" lang="haskell"><span class="n" style="color: #333;">tcIfaceUnivCoProv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IfaceProofIrrelProv</span> <span class="n" style="color: #333;">kco</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ProofIrrelProv</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">tcIfaceCo</span> <span class="n" style="color: #333;">kco</span></span>
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1252
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1257
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<pre style="margin: 0;"> <span id="LC1257" class="line" lang="haskell"><span class="n" style="color: #333;">tcIfaceUnivCoProv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IfacePluginProv</span> <span class="n" style="color: #333;">str</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">PluginProv</span> <span class="n" style="color: #333;">str</span></span>
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1258
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<pre style="margin: 0;">+<span id="LC1258" class="line" lang="haskell"><span class="n" style="color: #333;">tcIfaceUnivCoProv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IfaceZappedProv</span> <span class="n" style="color: #333;">coFvs</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ZappedProv</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">mkDVarSet</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">tcIfaceLclId</span> <span class="n" style="color: #333;">coFvs</span></span>
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1253
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1259
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<pre style="margin: 0;"> <span id="LC1259" class="line" lang="haskell"></span>
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1254
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1260
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<pre style="margin: 0;"> <span id="LC1260" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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1255
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1261
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<pre style="margin: 0;"> <span id="LC1261" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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<li id="2119acd0d77cb9a80015bd3299a85327f09c9cd6">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/ea7f96de6f492a82564b0633152a895b9408c15f#2119acd0d77cb9a80015bd3299a85327f09c9cd6"><strong>compiler/iface/ToIface.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">@@ -275,6 +275,13 @@ toIfaceCoercionX fr co</td>
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275
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<pre style="margin: 0;"> <span id="LC275" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PhantomProv</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IfacePhantomProv</span> <span class="p">(</span><span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC276" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ProofIrrelProv</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IfaceProofIrrelProv</span> <span class="p">(</span><span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>
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277
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<pre style="margin: 0;"> <span id="LC277" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PluginProv</span> <span class="n" style="color: #333;">str</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IfacePluginProv</span> <span class="n" style="color: #333;">str</span></span>
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<pre style="margin: 0;">+<span id="LC278" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ZappedProv</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IfaceZappedProv</span> <span class="n" style="color: #333;">cvs</span> <span class="n" style="color: #333;">fCvs</span></span>
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<pre style="margin: 0;">+<span id="LC279" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC280" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">fCvs</span><span class="p">,</span> <span class="n" style="color: #333;">cvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">partitionWith</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">dVarSetElems</span> <span class="n" style="color: #333;">fvs</span></span>
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<pre style="margin: 0;">+<span id="LC281" class="line" lang="haskell"> <span class="n" style="color: #333;">isFree</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(`</span><span class="n" style="color: #333;">elemVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">fr</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC282" class="line" lang="haskell"> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">v</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;">isCoVar</span> <span class="n" style="color: #333;">v</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC283" class="line" lang="haskell"> <span class="n" style="color: #333;">isFree</span> <span class="n" style="color: #333;">v</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Left</span> <span class="n" style="color: #333;">v</span></span>
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<pre style="margin: 0;">+<span id="LC284" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Right</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">toIfaceCoVar</span> <span class="n" style="color: #333;">v</span></span>
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<pre style="margin: 0;"> <span id="LC285" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC286" class="line" lang="haskell"><span class="n" style="color: #333;">toIfaceTcArgs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IfaceAppArgs</span></span>
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<pre style="margin: 0;"> <span id="LC287" class="line" lang="haskell"><span class="n" style="color: #333;">toIfaceTcArgs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">toIfaceTcArgsX</span> <span class="n" style="color: #333;">emptyVarSet</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/ea7f96de6f492a82564b0633152a895b9408c15f#11e9bfd841c4163c1919b5e07efc84740e02010f"><strong>compiler/main/DynFlags.hs</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE CPP #-}</span></span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE FlexibleInstances #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE GeneralizedNewtypeDeriving #-}</span></span>
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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="c1" style="color: #998; font-style: italic;">-------------------------------------------------------------------------------</span></span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -45,6 +46,7 @@ module DynFlags (</td>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span></span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">FlagSpec</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span></span>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HasDynFlags</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">ContainsDynFlags</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span></span>
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49
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<pre style="margin: 0;">+<span id="LC49" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DynFlagsEnvM</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">runDynFlagsEnvM</span><span class="p">,</span></span>
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48
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50
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">RtsOptsEnabled</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span></span>
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49
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51
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HscTarget</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">isObjectTarget</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">defaultObjectTarget</span><span class="p">,</span></span>
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50
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52
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">targetRetainsAllBindings</span><span class="p">,</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="63" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="65" 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">@@ -63,6 +65,7 @@ module DynFlags (</td>
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63
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65
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<pre style="margin: 0;"> <span id="LC65" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">makeDynFlagsConsistent</span><span class="p">,</span></span>
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64
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66
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<pre style="margin: 0;"> <span id="LC66" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">shouldUseColor</span><span class="p">,</span></span>
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65
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67
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<pre style="margin: 0;"> <span id="LC67" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">shouldUseHexWordLiterals</span><span class="p">,</span></span>
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68
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<pre style="margin: 0;">+<span id="LC68" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">shouldBuildCoercions</span><span class="p">,</span></span>
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66
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69
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<pre style="margin: 0;"> <span id="LC69" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">positionIndependent</span><span class="p">,</span></span>
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67
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70
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<pre style="margin: 0;"> <span id="LC70" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">optimisationFlags</span><span class="p">,</span></span>
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68
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71
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="501" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="504" 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">@@ -501,6 +504,7 @@ data GeneralFlag</td>
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501
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504
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<pre style="margin: 0;"> <span id="LC504" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_D_faststring_stats</span></span>
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502
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505
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<pre style="margin: 0;"> <span id="LC505" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_D_dump_minimal_imports</span></span>
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503
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506
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<pre style="margin: 0;"> <span id="LC506" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_DoCoreLinting</span></span>
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507
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<pre style="margin: 0;">+<span id="LC507" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_DropCoercions</span></span>
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504
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508
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<pre style="margin: 0;"> <span id="LC508" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_DoStgLinting</span></span>
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505
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509
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<pre style="margin: 0;"> <span id="LC509" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_DoCmmLinting</span></span>
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506
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510
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<pre style="margin: 0;"> <span id="LC510" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_DoAsmLinting</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1358" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1362" 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">@@ -1358,6 +1362,17 @@ instance (Monad m, HasDynFlags m) => HasDynFlags (MaybeT m) where</td>
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1358
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1362
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<pre style="margin: 0;"> <span id="LC1362" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Monad</span> <span class="n" style="color: #333;">m</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">HasDynFlags</span> <span class="n" style="color: #333;">m</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">HasDynFlags</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ExceptT</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">m</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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1359
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1363
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<pre style="margin: 0;"> <span id="LC1363" class="line" lang="haskell"> <span class="n" style="color: #333;">getDynFlags</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lift</span> <span class="n" style="color: #333;">getDynFlags</span></span>
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<pre style="margin: 0;"> <span id="LC1364" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1365" class="line" lang="haskell"><span class="cd">-- | A reader monad over 'DynFlags'.</span></span>
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<pre style="margin: 0;">+<span id="LC1366" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlagsEnvM</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlagsEnvM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Reader</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1367" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Functor</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Applicative</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Monad</span><span class="p">)</span></span>
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1368
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<pre style="margin: 0;">+<span id="LC1368" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1369" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">HasDynFlags</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlagsEnvM</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC1370" class="line" lang="haskell"> <span class="n" style="color: #333;">getDynFlags</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlagsEnvM</span> <span class="n" style="color: #333;">ask</span></span>
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<pre style="margin: 0;">+<span id="LC1371" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1372" class="line" lang="haskell"><span class="n" style="color: #333;">runDynFlagsEnvM</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DynFlagsEnvM</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC1373" class="line" lang="haskell"><span class="n" style="color: #333;">runDynFlagsEnvM</span> <span class="n" style="color: #333;">dflags</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DynFlagsEnvM</span> <span class="n" style="color: #333;">m</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">runReader</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">dflags</span></span>
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<pre style="margin: 0;">+<span id="LC1374" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1375" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1376" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">ContainsDynFlags</span> <span class="n" style="color: #333;">t</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC1377" class="line" lang="haskell"> <span class="n" style="color: #333;">extractDynFlags</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">t</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span></span>
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<pre style="margin: 0;"> <span id="LC1378" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1687,6 +1702,14 @@ shouldUseHexWordLiterals :: DynFlags -> Bool</td>
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<pre style="margin: 0;"> <span id="LC1702" class="line" lang="haskell"><span class="n" style="color: #333;">shouldUseHexWordLiterals</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;"> <span id="LC1703" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Opt_HexWordLiterals</span> <span class="p">`</span><span class="kt" style="color: #458; font-weight: 600;">EnumSet</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">member</span><span class="p">`</span> <span class="n" style="color: #333;">generalFlags</span> <span class="n" style="color: #333;">dflags</span></span>
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<pre style="margin: 0;"> <span id="LC1704" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1705" class="line" lang="haskell"><span class="cd">-- | Should we generate coercions?</span></span>
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<pre style="margin: 0;">+<span id="LC1706" 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="LC1707" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Zapping coercions] for details.</span></span>
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<pre style="margin: 0;">+<span id="LC1708" class="line" lang="haskell"><span class="n" style="color: #333;">shouldBuildCoercions</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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1709
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<pre style="margin: 0;">+<span id="LC1709" class="line" lang="haskell"><span class="n" style="color: #333;">shouldBuildCoercions</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;">=</span></span>
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1710
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<pre style="margin: 0;">+<span id="LC1710" class="line" lang="haskell"> <span class="n" style="color: #333;">gopt</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_DoCoreLinting</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">gopt</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_DropCoercions</span> <span class="n" style="color: #333;">dflags</span><span class="p">)</span></span>
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1711
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<pre style="margin: 0;">+<span id="LC1711" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- TODO: Add flag to explicitly enable coercion generation without linting?</span></span>
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1712
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<pre style="margin: 0;">+<span id="LC1712" class="line" lang="haskell"></span>
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1690
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<pre style="margin: 0;"> <span id="LC1713" class="line" lang="haskell"><span class="cd">-- | Are we building with @-fPIE@ or @-fPIC@ enabled?</span></span>
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1691
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1714
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<pre style="margin: 0;"> <span id="LC1714" class="line" lang="haskell"><span class="n" style="color: #333;">positionIndependent</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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1692
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1715
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<pre style="margin: 0;"> <span id="LC1715" class="line" lang="haskell"><span class="n" style="color: #333;">positionIndependent</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">gopt</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_PIC</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">gopt</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_PIE</span> <span class="n" style="color: #333;">dflags</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="3463" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="3486" 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">@@ -3463,6 +3486,8 @@ dynamic_flags_deps = [</td>
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3463
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3486
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<pre style="margin: 0;"> <span id="LC3486" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">setDumpFlag</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_D_dump_rtti</span><span class="p">)</span></span>
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3464
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3487
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<pre style="margin: 0;"> <span id="LC3487" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">make_ord_flag</span> <span class="n" style="color: #333;">defGhcFlag</span> <span class="s" style="color: #d14;">"dcore-lint"</span></span>
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3465
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3488
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<pre style="margin: 0;"> <span id="LC3488" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NoArg</span> <span class="p">(</span><span class="n" style="color: #333;">setGeneralFlag</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_DoCoreLinting</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC3489" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">make_ord_flag</span> <span class="n" style="color: #333;">defGhcFlag</span> <span class="s" style="color: #d14;">"ddrop-coercions"</span></span>
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<pre style="margin: 0;">+<span id="LC3490" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NoArg</span> <span class="p">(</span><span class="n" style="color: #333;">setGeneralFlag</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_DropCoercions</span><span class="p">))</span></span>
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3466
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3491
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<pre style="margin: 0;"> <span id="LC3491" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">make_ord_flag</span> <span class="n" style="color: #333;">defGhcFlag</span> <span class="s" style="color: #d14;">"dstg-lint"</span></span>
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3467
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3492
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<pre style="margin: 0;"> <span id="LC3492" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NoArg</span> <span class="p">(</span><span class="n" style="color: #333;">setGeneralFlag</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_DoStgLinting</span><span class="p">))</span></span>
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3468
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3493
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<pre style="margin: 0;"> <span id="LC3493" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">make_ord_flag</span> <span class="n" style="color: #333;">defGhcFlag</span> <span class="s" style="color: #d14;">"dcmm-lint"</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/ea7f96de6f492a82564b0633152a895b9408c15f#1b594d79ffc66b4bbbefcc4dccef85df99efbb84"><strong>compiler/typecheck/TcFlatten.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">@@ -22,10 +22,12 @@ import Var</td>
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<pre style="margin: 0;"> <span id="LC22" 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="LC23" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">VarEnv</span></span>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Outputable</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">DynFlags</span></span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">TcSMonad</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">TcS</span></span>
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<pre style="margin: 0;"> <span id="LC27" 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;">SwapFlag</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Util</span></span>
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<pre style="margin: 0;">+<span id="LC30" 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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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Bag</span></span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Monad</span></span>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">MonadUtils</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">zipWith3M</span> <span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="498" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -498,6 +500,9 @@ instance Applicative FlatM where</td>
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<pre style="margin: 0;"> <span id="LC500" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FlatM</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">const</span> <span class="p">(</span><span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC501" class="line" lang="haskell"> <span class="p">(</span><span class="o" style="font-weight: 600;"><*></span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ap</span></span>
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<pre style="margin: 0;"> <span id="LC502" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC503" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">HasDynFlags</span> <span class="kt" style="color: #458; font-weight: 600;">FlatM</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC504" class="line" lang="haskell"> <span class="n" style="color: #333;">getDynFlags</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">liftTcS</span> <span class="n" style="color: #333;">getDynFlags</span></span>
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<pre style="margin: 0;">+<span id="LC505" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC506" class="line" lang="haskell"><span class="n" style="color: #333;">liftTcS</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FlatM</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;"> <span id="LC507" class="line" lang="haskell"><span class="n" style="color: #333;">liftTcS</span> <span class="n" style="color: #333;">thing_inside</span></span>
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<pre style="margin: 0;"> <span id="LC508" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FlatM</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">const</span> <span class="n" style="color: #333;">thing_inside</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">@@ -1330,7 +1335,7 @@ flatten_exact_fam_app_fully tc tys</td>
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1335
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<pre style="margin: 0;"> <span id="LC1335" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Reduce type family applications eagerly]</span></span>
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1331
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1336
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<pre style="margin: 0;"> <span id="LC1336" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the following tcTypeKind should never be evaluated, as it's just used in</span></span>
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<pre style="margin: 0;"> <span id="LC1337" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- casting, and casts by refl are dropped</span></span>
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1333
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<pre style="margin: 0;">-<span id="LC1333" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">mOut</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">try_to_reduce_nocache</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span></span>
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1338
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<pre style="margin: 0;">+<span id="LC1338" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">mOut</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">try_to_reduce_nocache</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span><span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff right">emptyDVarSet</span></span></span>
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1334
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1339
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<pre style="margin: 0;"> <span id="LC1339" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">mOut</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<td class="diff-line-num old_line" data-linenumber="1335" 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">
1335
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1340
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<pre style="margin: 0;"> <span id="LC1340" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">out</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">out</span></span>
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<td class="diff-line-num old_line" data-linenumber="1336" 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">
1336
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<td class="diff-line-num new_line" data-linenumber="1341" 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">
1341
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<pre style="margin: 0;"> <span id="LC1341" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1374" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1379" 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">@@ -1374,6 +1379,7 @@ flatten_exact_fam_app_fully tc tys</td>
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1374
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1379
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<pre style="margin: 0;"> <span id="LC1379" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">mOut</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">try_to_reduce</span> <span class="n" style="color: #333;">tc</span></span>
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<td class="diff-line-num old_line" data-linenumber="1375" 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">
1375
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1380
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<pre style="margin: 0;"> <span id="LC1380" class="line" lang="haskell"> <span class="n" style="color: #333;">xis</span></span>
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1376
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1381
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<pre style="margin: 0;"> <span id="LC1381" class="line" lang="haskell"> <span class="n" style="color: #333;">kind_co</span></span>
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1382
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<pre style="margin: 0;">+<span id="LC1382" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">tyCoVarsOfCoDSet</span> <span class="n" style="color: #333;">ret_co</span><span class="p">)</span></span>
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1377
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1383
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<pre style="margin: 0;"> <span id="LC1383" class="line" lang="haskell"> <span class="p">(`</span><span class="n" style="color: #333;">mkTransCo</span><span class="p">`</span> <span class="n" style="color: #333;">ret_co</span><span class="p">)</span></span>
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1378
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1384
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<pre style="margin: 0;"> <span id="LC1384" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">mOut</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1379
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1385
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<pre style="margin: 0;"> <span id="LC1385" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">out</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">out</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1419" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1425" 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">@@ -1419,11 +1425,18 @@ flatten_exact_fam_app_fully tc tys</td>
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1419
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1425
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<pre style="margin: 0;"> <span id="LC1425" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- where</span></span>
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<td class="diff-line-num old_line" data-linenumber="1420" 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">
1420
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<td class="diff-line-num new_line" data-linenumber="1426" 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">
1426
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<pre style="margin: 0;"> <span id="LC1426" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- orig_args is what was passed to the outer</span></span>
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1421
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1427
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<pre style="margin: 0;"> <span id="LC1427" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- function</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1428" 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">
1428
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<pre style="margin: 0;">+<span id="LC1428" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DTyCoVarSet</span> <span class="c1" style="color: #998; font-style: italic;">-- free variables of ret_co</span></span>
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1422
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1429
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<pre style="margin: 0;"> <span id="LC1429" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="c1" style="color: #998; font-style: italic;">-- :: (xi |> kind_co) ~ F args</span></span>
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1423
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1430
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<pre style="margin: 0;"> <span id="LC1430" 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="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- what to return from outer function</span></span>
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1424
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1431
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<pre style="margin: 0;"> <span id="LC1431" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FlatM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Xi</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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1425
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<pre style="margin: 0;">-<span id="LC1425" class="line" lang="haskell"> <span class="n" style="color: #333;">try_to_reduce</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span> <span class="n" style="color: #333;">kind_co</span> <span class="n" style="color: #333;">update_co</span></span>
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1426
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<pre style="margin: 0;">-<span id="LC1426" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">checkStackDepth</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span></span>
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1432
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<pre style="margin: 0;">+<span id="LC1432" class="line" lang="haskell"> <span class="n" style="color: #333;">try_to_reduce</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span> <span class="n" style="color: #333;">kind_co</span> <span class="n" style="color: #333;">ret_co_fvs</span> <span class="n" style="color: #333;">update_co</span></span>
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1433
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<pre style="margin: 0;">+<span id="LC1433" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filterDVarSet</span> <span class="n" style="color: #333;">isCoVar</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tyCoVarsOfTypesDSet</span> <span class="n" style="color: #333;">tys</span></span>
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1434
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<pre style="margin: 0;">+<span id="LC1434" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">unionDVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">tyCoVarsOfCoDSet</span> <span class="n" style="color: #333;">kind_co</span></span>
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1435
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<pre style="margin: 0;">+<span id="LC1435" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">unionDVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">ret_co_fvs</span></span>
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1436
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<pre style="margin: 0;">+<span id="LC1436" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Zapping coercions] in TyCoRep</span></span>
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1437
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<pre style="margin: 0;">+<span id="LC1437" class="line" lang="haskell"> <span class="n" style="color: #333;">fam_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span></span>
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1438
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<pre style="margin: 0;">+<span id="LC1438" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">checkStackDepth</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span></span>
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1439
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<pre style="margin: 0;">+<span id="LC1439" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getDynFlags</span></span>
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1427
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1440
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<pre style="margin: 0;"> <span id="LC1440" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mb_match</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">liftTcS</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">matchFam</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span></span>
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1428
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1441
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<pre style="margin: 0;"> <span id="LC1441" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">mb_match</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1429
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1442
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<pre style="margin: 0;"> <span id="LC1442" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: norm_co will always be homogeneous. All type families</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1443" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1443,18 +1456,25 @@ flatten_exact_fam_app_fully tc tys</td>
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1443
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1456
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<pre style="margin: 0;"> <span id="LC1456" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">eq_rel</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">NomEq</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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1444
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1457
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<pre style="margin: 0;"> <span id="LC1457" class="line" lang="haskell"> <span class="n" style="color: #333;">liftTcS</span> <span class="o" style="font-weight: 600;">$</span></span>
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1445
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1458
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<pre style="margin: 0;"> <span id="LC1458" class="line" lang="haskell"> <span class="n" style="color: #333;">extendFlatCache</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span> <span class="p">(</span> <span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="n" style="color: #333;">xi</span><span class="p">,</span> <span class="n" style="color: #333;">flavour</span> <span class="p">)</span></span>
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1446
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<pre style="margin: 0;">-<span id="LC1446" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">role</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eqRelRole</span> <span class="n" style="color: #333;">eq_rel</span></span>
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1447
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<pre style="margin: 0;">-<span id="LC1447" class="line" lang="haskell"> <span class="n" style="color: #333;">xi'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">xi</span> <span class="p">`</span><span class="n" style="color: #333;">mkCastTy</span><span class="p">`</span> <span class="n" style="color: #333;">kind_co</span></span>
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1448
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<pre style="margin: 0;">-<span id="LC1448" class="line" lang="haskell"> <span class="n" style="color: #333;">co'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">update_co</span> <span class="o" style="font-weight: 600;">$</span></span>
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1449
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<pre style="margin: 0;">-<span id="LC1449" class="line" lang="haskell"> <span class="n" style="color: #333;">mkTcCoherenceLeftCo</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">xi</span> <span class="n" style="color: #333;">kind_co</span> <span class="p">(</span><span class="n" style="color: #333;">mkSymCo</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>
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1450
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<pre style="margin: 0;">-<span id="LC1450" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</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;">xi'</span><span class="p">,</span> <span class="n" style="color: #333;">co'</span><span class="p">)</span> <span class="p">}</span></span>
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1459
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<pre style="margin: 0;">+<span id="LC1459" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">xi'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">xi</span> <span class="p">`</span><span class="n" style="color: #333;">mkCastTy</span><span class="p">`</span> <span class="n" style="color: #333;">kind_co</span></span>
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1460
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<pre style="margin: 0;">+<span id="LC1460" class="line" lang="haskell"> <span class="n" style="color: #333;">role</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eqRelRole</span> <span class="n" style="color: #333;">eq_rel</span></span>
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1461
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<pre style="margin: 0;">+<span id="LC1461" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Zapping coercions]</span></span>
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1462
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<pre style="margin: 0;">+<span id="LC1462" class="line" lang="haskell"> <span class="n" style="color: #333;">co'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkZappedCoercion</span> <span class="n" style="color: #333;">dflags</span> <span class="p">(</span><span class="n" style="color: #333;">mkSymCo</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Pair</span> <span class="n" style="color: #333;">xi'</span> <span class="n" style="color: #333;">fam_ty</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">fvs</span></span>
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1463
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<pre style="margin: 0;">+<span id="LC1463" class="line" lang="haskell"> <span class="n" style="color: #333;">co''</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">update_co</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkTcCoherenceLeftCo</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">xi</span> <span class="n" style="color: #333;">kind_co</span> <span class="n" style="color: #333;">co'</span></span>
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1464
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<pre style="margin: 0;">+<span id="LC1464" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</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;">xi'</span><span class="p">,</span> <span class="n" style="color: #333;">co''</span><span class="p">)</span> <span class="p">}</span></span>
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1451
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1465
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<pre style="margin: 0;"> <span id="LC1465" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="p">}</span></span>
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1452
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1466
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<pre style="margin: 0;"> <span id="LC1466" class="line" lang="haskell"></span>
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1453
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1467
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<pre style="margin: 0;"> <span id="LC1467" class="line" lang="haskell"> <span class="n" style="color: #333;">try_to_reduce_nocache</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="c1" style="color: #998; font-style: italic;">-- F, family tycon</span></span>
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1454
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1468
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<pre style="margin: 0;"> <span id="LC1468" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- args, not necessarily flattened</span></span>
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1469
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<pre style="margin: 0;">+<span id="LC1469" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DTyCoVarSet</span> <span class="c1" style="color: #998; font-style: italic;">-- free variables of ret_co</span></span>
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1455
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1470
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<pre style="margin: 0;"> <span id="LC1470" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FlatM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Xi</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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1456
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<pre style="margin: 0;">-<span id="LC1456" class="line" lang="haskell"> <span class="n" style="color: #333;">try_to_reduce_nocache</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span></span>
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1457
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<pre style="margin: 0;">-<span id="LC1457" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">checkStackDepth</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span></span>
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1471
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<pre style="margin: 0;">+<span id="LC1471" class="line" lang="haskell"> <span class="n" style="color: #333;">try_to_reduce_nocache</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span> <span class="n" style="color: #333;">fvs_ret_co</span></span>
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1472
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<pre style="margin: 0;">+<span id="LC1472" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filterDVarSet</span> <span class="n" style="color: #333;">isCoVar</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tyCoVarsOfTypesDSet</span> <span class="n" style="color: #333;">tys</span></span>
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1473
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<pre style="margin: 0;">+<span id="LC1473" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">unionDVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">fvs_ret_co</span></span>
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1474
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<pre style="margin: 0;">+<span id="LC1474" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Zapping coercions] in TyCoRep</span></span>
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1475
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<pre style="margin: 0;">+<span id="LC1475" class="line" lang="haskell"> <span class="n" style="color: #333;">fam_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span></span>
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1476
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<pre style="margin: 0;">+<span id="LC1476" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">checkStackDepth</span> <span class="n" style="color: #333;">fam_ty</span></span>
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1477
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<pre style="margin: 0;">+<span id="LC1477" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getDynFlags</span></span>
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1458
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1478
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<pre style="margin: 0;"> <span id="LC1478" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mb_match</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">liftTcS</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">matchFam</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span></span>
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1459
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1479
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<pre style="margin: 0;"> <span id="LC1479" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">mb_match</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1460
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1480
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<pre style="margin: 0;"> <span id="LC1480" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: norm_co will always be homogeneous. All type families</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1484" 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">@@ -1464,7 +1484,8 @@ flatten_exact_fam_app_fully tc tys</td>
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1464
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1484
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<pre style="margin: 0;"> <span id="LC1484" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">eq_rel</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getEqRel</span></span>
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1465
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1485
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<pre style="margin: 0;"> <span id="LC1485" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkSymCo</span> <span class="p">(</span><span class="n" style="color: #333;">maybeSubCo</span> <span class="n" style="color: #333;">eq_rel</span> <span class="n" style="color: #333;">norm_co</span></span>
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1466
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1486
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<pre style="margin: 0;"> <span id="LC1486" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">mkTransCo</span><span class="p">`</span> <span class="n" style="color: #333;">mkSymCo</span> <span class="n" style="color: #333;">final_co</span><span class="p">)</span></span>
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1467
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<pre style="margin: 0;">-<span id="LC1467" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</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;">xi</span><span class="p">,</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="p">}</span></span>
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1487
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<pre style="margin: 0;">+<span id="LC1487" class="line" lang="haskell"> <span class="n" style="color: #333;">co'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkZappedCoercion</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">co</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Pair</span> <span class="n" style="color: #333;">xi</span> <span class="n" style="color: #333;">fam_ty</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">fvs</span></span>
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1488
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<pre style="margin: 0;">+<span id="LC1488" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</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;">xi</span><span class="p">,</span> <span class="n" style="color: #333;">co'</span><span class="p">)</span> <span class="p">}</span></span>
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1468
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1489
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<pre style="margin: 0;"> <span id="LC1489" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="p">}</span></span>
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1469
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1490
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<pre style="margin: 0;"> <span id="LC1490" class="line" lang="haskell"></span>
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1470
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1491
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<pre style="margin: 0;"> <span id="LC1491" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Reduce type family applications eagerly]</span></span>
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<li id="350c4076427c611b8f14e875a4ca553041c2b847">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/ea7f96de6f492a82564b0633152a895b9408c15f#350c4076427c611b8f14e875a4ca553041c2b847"><strong>compiler/typecheck/TcHsType.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">@@ -65,6 +65,7 @@ module TcHsType (</td>
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<pre style="margin: 0;"> <span id="LC65" class="line" lang="haskell"></span>
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66
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<pre style="margin: 0;"> <span id="LC66" 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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67
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67
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<pre style="margin: 0;"> <span id="LC67" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC68" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">DynFlags</span></span>
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68
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69
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<pre style="margin: 0;"> <span id="LC69" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">HsSyn</span></span>
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69
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70
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<pre style="margin: 0;"> <span id="LC70" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">TcRnMonad</span></span>
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">TcEvidence</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/ea7f96de6f492a82564b0633152a895b9408c15f#9bf2a6096cb14bc07c1c4cdd8299cfd75ed78650"><strong>compiler/typecheck/TcTyDecls.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">@@ -138,6 +138,9 @@ synonymTyConsOfType ty</td>
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138
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<pre style="margin: 0;"> <span id="LC138" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PhantomProv</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go_co</span> <span class="n" style="color: #333;">co</span></span>
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139
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139
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<pre style="margin: 0;"> <span id="LC139" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ProofIrrelProv</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go_co</span> <span class="n" style="color: #333;">co</span></span>
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140
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140
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<pre style="margin: 0;"> <span id="LC140" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PluginProv</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;">emptyNameEnv</span></span>
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141
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<pre style="margin: 0;">+<span id="LC141" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ZappedProv</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;">emptyNameEnv</span></span>
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142
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<pre style="margin: 0;">+<span id="LC142" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- [ZappedCoDifference]: This won't report type synonyms present in the</span></span>
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<pre style="margin: 0;">+<span id="LC143" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- unzapped proof but not its kind.</span></span>
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144
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<pre style="margin: 0;"> <span id="LC144" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC145" class="line" lang="haskell"> <span class="n" style="color: #333;">go_tc</span> <span class="n" style="color: #333;">tc</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTypeSynonymTyCon</span> <span class="n" style="color: #333;">tc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unitNameEnv</span> <span class="p">(</span><span class="n" style="color: #333;">tyConName</span> <span class="n" style="color: #333;">tc</span><span class="p">)</span> <span class="n" style="color: #333;">tc</span></span>
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143
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<pre style="margin: 0;"> <span id="LC146" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyNameEnv</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/ea7f96de6f492a82564b0633152a895b9408c15f#341fd962c5f2c9fcf8be3dbdaa9a14ee1538af07"><strong>compiler/typecheck/TcType.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">@@ -1020,6 +1020,7 @@ exactTyCoVarsOfType ty</td>
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1020
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1020
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<pre style="margin: 0;"> <span id="LC1020" class="line" lang="haskell"> <span class="n" style="color: #333;">goProv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PhantomProv</span> <span class="n" style="color: #333;">kco</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">goCo</span> <span class="n" style="color: #333;">kco</span></span>
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1021
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1021
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<pre style="margin: 0;"> <span id="LC1021" class="line" lang="haskell"> <span class="n" style="color: #333;">goProv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ProofIrrelProv</span> <span class="n" style="color: #333;">kco</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">goCo</span> <span class="n" style="color: #333;">kco</span></span>
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1022
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1022
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<pre style="margin: 0;"> <span id="LC1022" class="line" lang="haskell"> <span class="n" style="color: #333;">goProv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PluginProv</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;">emptyVarSet</span></span>
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1023
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<pre style="margin: 0;">+<span id="LC1023" class="line" lang="haskell"> <span class="n" style="color: #333;">goProv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ZappedProv</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;">emptyVarSet</span> <span class="c1" style="color: #998; font-style: italic;">-- TODO</span></span>
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1024
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<pre style="margin: 0;"> <span id="LC1024" class="line" lang="haskell"></span>
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1024
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1025
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<pre style="margin: 0;"> <span id="LC1025" class="line" lang="haskell"> <span class="n" style="color: #333;">goVar</span> <span class="n" style="color: #333;">v</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unitVarSet</span> <span class="n" style="color: #333;">v</span> <span class="p">`</span><span class="n" style="color: #333;">unionVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="n" style="color: #333;">varType</span> <span class="n" style="color: #333;">v</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1026" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/ea7f96de6f492a82564b0633152a895b9408c15f#8cd24482c6f44f6736157718a50265828b6b7436"><strong>compiler/types/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">@@ -97,6 +97,9 @@ module Coercion (</td>
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<pre style="margin: 0;"> <span id="LC97" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ** Forcing evaluation of coercions</span></span>
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<pre style="margin: 0;"> <span id="LC98" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">seqCo</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC99" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC100" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ** Eliding coercions</span></span>
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<pre style="margin: 0;">+<span id="LC101" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">zapCoercion</span><span class="p">,</span></span>
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102
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<pre style="margin: 0;">+<span id="LC102" class="line" lang="haskell"></span>
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100
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<pre style="margin: 0;"> <span id="LC103" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * Pretty-printing</span></span>
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101
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104
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<pre style="margin: 0;"> <span id="LC104" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">pprCo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pprParendCo</span><span class="p">,</span></span>
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102
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105
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<pre style="margin: 0;"> <span id="LC105" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">pprCoAxiom</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pprCoAxBranch</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pprCoAxBranchLHS</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">@@ -970,6 +973,8 @@ mkSymCo :: Coercion -> Coercion</td>
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970
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973
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<pre style="margin: 0;"> <span id="LC973" class="line" lang="haskell"><span class="n" style="color: #333;">mkSymCo</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isReflCo</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">co</span></span>
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971
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974
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<pre style="margin: 0;"> <span id="LC974" class="line" lang="haskell"><span class="n" style="color: #333;">mkSymCo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SymCo</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">co</span></span>
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972
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975
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<pre style="margin: 0;"> <span id="LC975" class="line" lang="haskell"><span class="n" style="color: #333;">mkSymCo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SubCo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SymCo</span> <span class="n" style="color: #333;">co</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SubCo</span> <span class="n" style="color: #333;">co</span></span>
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976
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<pre style="margin: 0;">+<span id="LC976" class="line" lang="haskell"><span class="n" style="color: #333;">mkSymCo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UnivCo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ZappedProv</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">t1</span> <span class="n" style="color: #333;">t2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">UnivCo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ZappedProv</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">t2</span> <span class="n" style="color: #333;">t1</span></span>
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<pre style="margin: 0;">+<span id="LC977" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- TODO: Handle other provenances</span></span>
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973
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978
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<pre style="margin: 0;"> <span id="LC978" class="line" lang="haskell"><span class="n" style="color: #333;">mkSymCo</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SymCo</span> <span class="n" style="color: #333;">co</span></span>
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974
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979
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<pre style="margin: 0;"> <span id="LC979" class="line" lang="haskell"></span>
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975
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980
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<pre style="margin: 0;"> <span id="LC980" class="line" lang="haskell"><span class="cd">-- | Create a new 'Coercion' by composing the two given 'Coercion's transitively.</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1114" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="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">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1114,6 +1119,10 @@ nthCoRole n co</td>
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1114
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1119
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<pre style="margin: 0;"> <span id="LC1119" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Pair</span> <span class="n" style="color: #333;">lty</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">coercionKindRole</span> <span class="n" style="color: #333;">co</span></span>
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1115
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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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1116
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1121
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<pre style="margin: 0;"> <span id="LC1121" class="line" lang="haskell"><span class="n" style="color: #333;">mkLRCo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LeftOrRight</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span></span>
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1122
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<pre style="margin: 0;">+<span id="LC1122" class="line" lang="haskell"><span class="n" style="color: #333;">mkLRCo</span> <span class="n" style="color: #333;">lr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UnivCo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ZappedProv</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">t1</span> <span class="n" style="color: #333;">t2</span><span class="p">)</span></span>
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1123
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<pre style="margin: 0;">+<span id="LC1123" 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="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ZappedProv</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="n" style="color: #333;">r</span></span>
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1124
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<pre style="margin: 0;">+<span id="LC1124" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">pickLR</span> <span class="n" style="color: #333;">lr</span> <span class="p">(</span><span class="n" style="color: #333;">splitAppTy</span> <span class="n" style="color: #333;">t1</span><span class="p">))</span></span>
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1125
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<pre style="margin: 0;">+<span id="LC1125" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">pickLR</span> <span class="n" style="color: #333;">lr</span> <span class="p">(</span><span class="n" style="color: #333;">splitAppTy</span> <span class="n" style="color: #333;">t2</span><span class="p">))</span></span>
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1117
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1126
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<pre style="margin: 0;"> <span id="LC1126" class="line" lang="haskell"><span class="n" style="color: #333;">mkLRCo</span> <span class="n" style="color: #333;">lr</span> <span class="n" style="color: #333;">co</span></span>
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1118
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1127
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<pre style="margin: 0;"> <span id="LC1127" 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="n" style="color: #333;">eq</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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1119
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1128
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<pre style="margin: 0;"> <span id="LC1128" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkReflCo</span> <span class="n" style="color: #333;">eq</span> <span class="p">(</span><span class="n" style="color: #333;">pickLR</span> <span class="n" style="color: #333;">lr</span> <span class="p">(</span><span class="n" style="color: #333;">splitAppTy</span> <span class="n" style="color: #333;">ty</span><span class="p">))</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1170" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1179" 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">@@ -1170,6 +1179,7 @@ mkKindCo co | Just (ty, _) <- isReflCo_maybe co = Refl (typeKind ty)</td>
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1170
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1179
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<pre style="margin: 0;"> <span id="LC1179" class="line" lang="haskell"><span class="n" style="color: #333;">mkKindCo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GRefl</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MCo</span> <span class="n" style="color: #333;">co</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">co</span></span>
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1171
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1180
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<pre style="margin: 0;"> <span id="LC1180" class="line" lang="haskell"><span class="n" style="color: #333;">mkKindCo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UnivCo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PhantomProv</span> <span class="n" style="color: #333;">h</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</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;">h</span></span>
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1172
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1181
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<pre style="margin: 0;"> <span id="LC1181" class="line" lang="haskell"><span class="n" style="color: #333;">mkKindCo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UnivCo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ProofIrrelProv</span> <span class="n" style="color: #333;">h</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</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;">h</span></span>
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1182
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<pre style="margin: 0;">+<span id="LC1182" class="line" lang="haskell"><span class="n" style="color: #333;">mkKindCo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UnivCo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ZappedProv</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</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 class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkUnivCo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ZappedProv</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</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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1173
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1183
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<pre style="margin: 0;"> <span id="LC1183" class="line" lang="haskell"><span class="n" style="color: #333;">mkKindCo</span> <span class="n" style="color: #333;">co</span></span>
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1174
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1184
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<pre style="margin: 0;"> <span id="LC1184" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Pair</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">coercionKind</span> <span class="n" style="color: #333;">co</span></span>
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1175
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1185
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<pre style="margin: 0;"> <span id="LC1185" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- generally, calling coercionKind during coercion creation is a bad idea,</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1193" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1203" 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">@@ -1193,6 +1203,7 @@ mkSubCo (FunCo Nominal arg res)</td>
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1193
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1203
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<pre style="margin: 0;"> <span id="LC1203" 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;">Representational</span></span>
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1194
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1204
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<pre style="margin: 0;"> <span id="LC1204" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">downgradeRole</span> <span class="kt" style="color: #458; font-weight: 600;">Representational</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">arg</span><span class="p">)</span></span>
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1195
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1205
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<pre style="margin: 0;"> <span id="LC1205" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">downgradeRole</span> <span class="kt" style="color: #458; font-weight: 600;">Representational</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">res</span><span class="p">)</span></span>
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1206
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<pre style="margin: 0;">+<span id="LC1206" class="line" lang="haskell"><span class="n" style="color: #333;">mkSubCo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UnivCo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ZappedProv</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">t1</span> <span class="n" style="color: #333;">t2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">UnivCo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ZappedProv</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">Representational</span> <span class="n" style="color: #333;">t1</span> <span class="n" style="color: #333;">t2</span></span>
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1196
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1207
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<pre style="margin: 0;"> <span id="LC1207" class="line" lang="haskell"><span class="n" style="color: #333;">mkSubCo</span> <span class="n" style="color: #333;">co</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;">coercionRole</span> <span class="n" style="color: #333;">co</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;">ppr</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">coercionRole</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="p">)</span></span>
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1197
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1208
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<pre style="margin: 0;"> <span id="LC1208" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SubCo</span> <span class="n" style="color: #333;">co</span></span>
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1198
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<td class="diff-line-num new_line" data-linenumber="1209" 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">
1209
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<pre style="margin: 0;"> <span id="LC1209" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1293" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1304" 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">@@ -1293,6 +1304,7 @@ setNominalRole_maybe r co</td>
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1293
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1304
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<pre style="margin: 0;"> <span id="LC1304" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PhantomProv</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;">False</span> <span class="c1" style="color: #998; font-style: italic;">-- should always be phantom</span></span>
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<td class="diff-line-num old_line" data-linenumber="1294" 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">
1294
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<td class="diff-line-num new_line" data-linenumber="1305" 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">
1305
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<pre style="margin: 0;"> <span id="LC1305" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ProofIrrelProv</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;">True</span> <span class="c1" style="color: #998; font-style: italic;">-- it's always safe</span></span>
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<td class="diff-line-num old_line" data-linenumber="1295" 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">
1295
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<td class="diff-line-num new_line" data-linenumber="1306" 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">
1306
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<pre style="margin: 0;"> <span id="LC1306" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PluginProv</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;">False</span> <span class="c1" style="color: #998; font-style: italic;">-- who knows? This choice is conservative.</span></span>
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<td class="diff-line-num new old_line" data-linenumber="1296" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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1307
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<pre style="margin: 0;">+<span id="LC1307" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ZappedProv</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;">False</span> <span class="c1" style="color: #998; font-style: italic;">-- conservatively say no</span></span>
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1296
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1308
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<pre style="margin: 0;"> <span id="LC1308" 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="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">UnivCo</span> <span class="n" style="color: #333;">prov</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">co1</span> <span class="n" style="color: #333;">co2</span></span>
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1297
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<td class="diff-line-num new_line" data-linenumber="1309" 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">
1309
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<pre style="margin: 0;"> <span id="LC1309" class="line" lang="haskell"> <span class="n" style="color: #333;">setNominalRole_maybe_helper</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;">Nothing</span></span>
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1298
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1310
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<pre style="margin: 0;"> <span id="LC1310" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1400" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1412" 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">@@ -1400,6 +1412,7 @@ promoteCoercion co = case co of</td>
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1400
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1412
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<pre style="margin: 0;"> <span id="LC1412" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">UnivCo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PhantomProv</span> <span class="n" style="color: #333;">kco</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">kco</span></span>
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<td class="diff-line-num old_line" data-linenumber="1401" 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">
1401
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1413
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<pre style="margin: 0;"> <span id="LC1413" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">UnivCo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ProofIrrelProv</span> <span class="n" style="color: #333;">kco</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">kco</span></span>
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<td class="diff-line-num old_line" data-linenumber="1402" 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">
1402
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<td class="diff-line-num new_line" data-linenumber="1414" 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">
1414
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<pre style="margin: 0;"> <span id="LC1414" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">UnivCo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PluginProv</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mkKindCo</span> <span class="n" style="color: #333;">co</span></span>
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<td class="diff-line-num new old_line" data-linenumber="1403" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="1415" 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">
1415
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<pre style="margin: 0;">+<span id="LC1415" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">UnivCo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ZappedProv</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mkKindCo</span> <span class="n" style="color: #333;">co</span></span>
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1403
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1416
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<pre style="margin: 0;"> <span id="LC1416" class="line" lang="haskell"></span>
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1404
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1417
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<pre style="margin: 0;"> <span id="LC1417" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SymCo</span> <span class="n" style="color: #333;">g</span></span>
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1405
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1418
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<pre style="margin: 0;"> <span id="LC1418" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mkSymCo</span> <span class="p">(</span><span class="n" style="color: #333;">promoteCoercion</span> <span class="n" style="color: #333;">g</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">@@ -2157,6 +2170,7 @@ seqProv UnsafeCoerceProv = ()</td>
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2157
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2170
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<pre style="margin: 0;"> <span id="LC2170" class="line" lang="haskell"><span class="n" style="color: #333;">seqProv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PhantomProv</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">seqCo</span> <span class="n" style="color: #333;">co</span></span>
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2158
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<pre style="margin: 0;"> <span id="LC2171" class="line" lang="haskell"><span class="n" style="color: #333;">seqProv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ProofIrrelProv</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">seqCo</span> <span class="n" style="color: #333;">co</span></span>
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2159
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2172
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<pre style="margin: 0;"> <span id="LC2172" class="line" lang="haskell"><span class="n" style="color: #333;">seqProv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PluginProv</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC2173" class="line" lang="haskell"><span class="n" style="color: #333;">seqProv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ZappedProv</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">seqDVarSet</span> <span class="n" style="color: #333;">fvs</span></span>
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2174
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<pre style="margin: 0;"> <span id="LC2174" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2175" class="line" lang="haskell"><span class="n" style="color: #333;">seqCos</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Coercion</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC2176" class="line" lang="haskell"><span class="n" style="color: #333;">seqCos</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/ea7f96de6f492a82564b0633152a895b9408c15f#243f518105cdb34e9b3345383e6293bc1d77b683"><strong>compiler/types/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">@@ -49,4 +49,5 @@ liftCoSubst :: HasDebugCallStack => Role -> LiftingContext -> Type -> Coercion</td>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="plaintext">seqCo :: Coercion -> ()</span>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="plaintext">coercionKind :: Coercion -> Pair Type</span>
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<pre style="margin: 0;">+<span id="LC52" class="line" lang="plaintext">coercionKindRole :: Coercion -> (Pair Type, Role)</span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="plaintext">coercionType :: Coercion -> Type</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/ea7f96de6f492a82564b0633152a895b9408c15f#650f968dabaaf0f93c1caa167d85c981c45e3fc1"><strong>compiler/types/FamInstEnv.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1747,6 +1747,9 @@ allTyCoVarsInTy = go</td>
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<pre style="margin: 0;"> <span id="LC1747" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PhantomProv</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go_co</span> <span class="n" style="color: #333;">co</span></span>
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1748
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<pre style="margin: 0;"> <span id="LC1748" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ProofIrrelProv</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go_co</span> <span class="n" style="color: #333;">co</span></span>
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<pre style="margin: 0;"> <span id="LC1749" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PluginProv</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;">emptyVarSet</span></span>
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<pre style="margin: 0;">+<span id="LC1750" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ZappedProv</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;">emptyVarSet</span></span>
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<pre style="margin: 0;">+<span id="LC1751" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We don't track free type variables, only</span></span>
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<pre style="margin: 0;">+<span id="LC1752" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- coercion variables.</span></span>
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<pre style="margin: 0;"> <span id="LC1753" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1754" class="line" lang="haskell"><span class="n" style="color: #333;">mkFlattenFreshTyName</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Uniquable</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Name</span></span>
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<pre style="margin: 0;"> <span id="LC1755" class="line" lang="haskell"><span class="n" style="color: #333;">mkFlattenFreshTyName</span> <span class="n" style="color: #333;">unq</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/ea7f96de6f492a82564b0633152a895b9408c15f#67a2fcd4f9dc88c950d518e4d2a458bd4228414f"><strong>compiler/types/OptCoercion.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -108,8 +108,8 @@ optCoercion :: DynFlags -> TCvSubst -> Coercion -> NormalCo</td>
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<pre style="margin: 0;"> <span id="LC108" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ^ optCoercion applies a substitution to a coercion,</span></span>
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<pre style="margin: 0;"> <span id="LC109" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- *and* optimises it to reduce its size</span></span>
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<pre style="margin: 0;"> <span id="LC110" class="line" lang="haskell"><span class="n" style="color: #333;">optCoercion</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">co</span></span>
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<pre style="margin: 0;">-<span id="LC111" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">hasNoOptCoercion</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substCo</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">co</span></span>
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<pre style="margin: 0;">-<span id="LC112" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">optCoercion'</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">co</span></span>
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<pre style="margin: 0;">+<span id="LC111" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">hasNoOptCoercion</span> <span class="n" style="color: #333;">dflags</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substCo</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">co</span></span>
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<pre style="margin: 0;">+<span id="LC112" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">optCoercion'</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">co</span></span>
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<pre style="margin: 0;"> <span id="LC113" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC114" class="line" lang="haskell"><span class="n" style="color: #333;">optCoercion'</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">NormalCo</span></span>
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<pre style="margin: 0;"> <span id="LC115" class="line" lang="haskell"><span class="n" style="color: #333;">optCoercion'</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">co</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">@@ -497,6 +497,14 @@ opt_univ env sym (PhantomProv h) _r ty1 ty2</td>
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<pre style="margin: 0;"> <span id="LC497" class="line" lang="haskell"> <span class="n" style="color: #333;">ty1'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substTy</span> <span class="p">(</span><span class="n" style="color: #333;">lcSubstLeft</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">ty1</span></span>
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<pre style="margin: 0;"> <span id="LC498" class="line" lang="haskell"> <span class="n" style="color: #333;">ty2'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substTy</span> <span class="p">(</span><span class="n" style="color: #333;">lcSubstRight</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;"> <span id="LC499" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC500" class="line" lang="haskell"><span class="n" style="color: #333;">opt_univ</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">sym</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ZappedProv</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;">+<span id="LC501" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">sym</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkUnivCo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ZappedProv</span> <span class="n" style="color: #333;">fvs'</span><span class="p">)</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">ty2'</span> <span class="n" style="color: #333;">ty1'</span></span>
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<pre style="margin: 0;">+<span id="LC502" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkUnivCo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ZappedProv</span> <span class="n" style="color: #333;">fvs'</span><span class="p">)</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">ty1'</span> <span class="n" style="color: #333;">ty2'</span></span>
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503
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<pre style="margin: 0;">+<span id="LC503" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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504
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<pre style="margin: 0;">+<span id="LC504" class="line" lang="haskell"> <span class="n" style="color: #333;">ty1'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substTy</span> <span class="p">(</span><span class="n" style="color: #333;">lcSubstLeft</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">ty1</span></span>
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505
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<pre style="margin: 0;">+<span id="LC505" class="line" lang="haskell"> <span class="n" style="color: #333;">ty2'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substTy</span> <span class="p">(</span><span class="n" style="color: #333;">lcSubstRight</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">ty2</span></span>
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506
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<pre style="margin: 0;">+<span id="LC506" class="line" lang="haskell"> <span class="n" style="color: #333;">fvs'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substFreeDVarSet</span> <span class="p">(</span><span class="n" style="color: #333;">lcTCvSubst</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">fvs</span></span>
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507
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<pre style="margin: 0;">+<span id="LC507" class="line" lang="haskell"></span>
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500
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508
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<pre style="margin: 0;"> <span id="LC508" class="line" lang="haskell"><span class="n" style="color: #333;">opt_univ</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">sym</span> <span class="n" style="color: #333;">prov</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">oty1</span> <span class="n" style="color: #333;">oty2</span></span>
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501
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509
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<pre style="margin: 0;"> <span id="LC509" 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;">tc1</span><span class="p">,</span> <span class="n" style="color: #333;">tys1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitTyConApp_maybe</span> <span class="n" style="color: #333;">oty1</span></span>
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502
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510
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<pre style="margin: 0;"> <span id="LC510" 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;">tc2</span><span class="p">,</span> <span class="n" style="color: #333;">tys2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitTyConApp_maybe</span> <span class="n" style="color: #333;">oty2</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="557" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="565" 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">@@ -557,6 +565,7 @@ opt_univ env sym prov role oty1 oty2</td>
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557
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565
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<pre style="margin: 0;"> <span id="LC565" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PhantomProv</span> <span class="n" style="color: #333;">kco</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PhantomProv</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">opt_co4_wrap</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">sym</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">kco</span></span>
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558
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566
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<pre style="margin: 0;"> <span id="LC566" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ProofIrrelProv</span> <span class="n" style="color: #333;">kco</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ProofIrrelProv</span> <span class="o" style="font-weight: 600;">$</span> <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="kt" style="color: #458; font-weight: 600;">False</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">kco</span></span>
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559
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567
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<pre style="margin: 0;"> <span id="LC567" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PluginProv</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">prov</span></span>
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568
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<pre style="margin: 0;">+<span id="LC568" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ZappedProv</span> <span class="n" style="color: #333;">fvs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ZappedProv</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">substFreeDVarSet</span> <span class="p">(</span><span class="n" style="color: #333;">lcTCvSubst</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">fvs</span></span>
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560
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569
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<pre style="margin: 0;"> <span id="LC569" class="line" lang="haskell"></span>
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561
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570
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<pre style="margin: 0;"> <span id="LC570" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-------------</span></span>
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562
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571
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<pre style="margin: 0;"> <span id="LC571" class="line" lang="haskell"><span class="n" style="color: #333;">opt_transList</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">InScopeSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">NormalCo</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">NormalCo</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">NormalCo</span><span class="p">]</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="639" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="648" 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">@@ -639,6 +648,8 @@ opt_trans_rule is in_co1@(UnivCo p1 r1 tyl1 _tyr1)</td>
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639
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648
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<pre style="margin: 0;"> <span id="LC648" class="line" lang="haskell"> <span class="n" style="color: #333;">opt_trans_prov</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ProofIrrelProv</span> <span class="n" style="color: #333;">kco1</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ProofIrrelProv</span> <span class="n" style="color: #333;">kco2</span><span class="p">)</span></span>
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640
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649
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<pre style="margin: 0;"> <span id="LC649" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">ProofIrrelProv</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">opt_trans</span> <span class="n" style="color: #333;">is</span> <span class="n" style="color: #333;">kco1</span> <span class="n" style="color: #333;">kco2</span></span>
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<pre style="margin: 0;"> <span id="LC650" class="line" lang="haskell"> <span class="n" style="color: #333;">opt_trans_prov</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PluginProv</span> <span class="n" style="color: #333;">str1</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PluginProv</span> <span class="n" style="color: #333;">str2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">str1</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">str2</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">p1</span></span>
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<pre style="margin: 0;">+<span id="LC651" class="line" lang="haskell"> <span class="n" style="color: #333;">opt_trans_prov</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ZappedProv</span> <span class="n" style="color: #333;">fvs1</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ZappedProv</span> <span class="n" style="color: #333;">fvs2</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC652" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">ZappedProv</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">fvs1</span> <span class="p">`</span><span class="n" style="color: #333;">unionDVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">fvs2</span></span>
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642
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<pre style="margin: 0;"> <span id="LC653" class="line" lang="haskell"> <span class="n" style="color: #333;">opt_trans_prov</span> <span class="kr" style="font-weight: 600;">_</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;">Nothing</span></span>
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643
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654
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<pre style="margin: 0;"> <span id="LC654" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC655" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Push transitivity down through matching top-level constructors.</span></span>
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<li id="88310e11ff3891efda62ffaa54c2830f1b147778">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/ea7f96de6f492a82564b0633152a895b9408c15f#88310e11ff3891efda62ffaa54c2830f1b147778"><strong>compiler/types/TyCoRep.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="40" 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">@@ -40,6 +40,7 @@ module TyCoRep (</td>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CoercionHole</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">coHoleCoVar</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">setCoHoleCoVar</span><span class="p">,</span></span>
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41
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CoercionN</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">CoercionR</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">CoercionP</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">KindCoercion</span><span class="p">,</span></span>
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42
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MCoercion</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">MCoercionR</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">MCoercionN</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkZappedCoercion</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">zapCoercion</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * Functions over types</span></span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkTyConTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkTyVarTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkTyVarTys</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">@@ -132,6 +133,7 @@ module TyCoRep (</td>
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132
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<pre style="margin: 0;"> <span id="LC133" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">substCoVarBndr</span><span class="p">,</span></span>
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133
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<pre style="margin: 0;"> <span id="LC134" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">substTyVar</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">substTyVars</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">substTyCoVars</span><span class="p">,</span></span>
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134
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<pre style="margin: 0;"> <span id="LC135" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">substForAllCoBndr</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC136" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">substFreeDVarSet</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC137" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">substVarBndrUsing</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">substForAllCoBndrUsing</span><span class="p">,</span></span>
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136
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<pre style="margin: 0;"> <span id="LC138" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">checkValidSubst</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isValidTCvSubst</span><span class="p">,</span></span>
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139
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<pre style="margin: 0;"> <span id="LC139" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -162,7 +164,7 @@ import {-# SOURCE #-} Type( isCoercionTy, mkAppTy, mkCastTy</td>
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162
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<pre style="margin: 0;"> <span id="LC164" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tyCoVarsOfTypeWellScoped</span></span>
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163
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165
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<pre style="margin: 0;"> <span id="LC165" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tyCoVarsOfTypesWellScoped</span></span>
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164
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<pre style="margin: 0;"> <span id="LC166" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">scopedSort</span></span>
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165
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<pre style="margin: 0;">-<span id="LC165" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">coreView</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC167" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">coreView</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">eqType</span></span> <span class="p">)</span></span>
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166
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<pre style="margin: 0;"> <span id="LC168" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Transitively pulls in a LOT of stuff, better to break the loop</span></span>
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169
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<pre style="margin: 0;"> <span id="LC169" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC170" 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;">Coercion</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">@@ -197,6 +199,7 @@ import UniqSet</td>
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199
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<pre style="margin: 0;"> <span id="LC199" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- libraries</span></span>
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<pre style="margin: 0;"> <span id="LC200" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="k" style="font-weight: 600;">qualified</span> <span class="nn" style="color: #555;">Data.Data</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">Data</span> <span class="n" style="color: #333;">hiding</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC201" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List</span></span>
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<pre style="margin: 0;">+<span id="LC202" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Maybe</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">fromMaybe</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC203" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.IORef</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">IORef</span> <span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- for CoercionHole</span></span>
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201
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<pre style="margin: 0;"> <span id="LC204" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC205" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1646,6 +1649,11 @@ data UnivCoProvenance</td>
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1646
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1649
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<pre style="margin: 0;"> <span id="LC1649" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">PluginProv</span> <span class="kt" style="color: #458; font-weight: 600;">String</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ From a plugin, which asserts that this coercion</span></span>
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1647
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<pre style="margin: 0;"> <span id="LC1650" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- is sound. The string is for the use of the plugin.</span></span>
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1648
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1651
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<pre style="margin: 0;"> <span id="LC1651" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1652" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ZappedProv</span> <span class="kt" style="color: #458; font-weight: 600;">DVarSet</span></span>
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<pre style="margin: 0;">+<span id="LC1653" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ See Note [Zapping coercions].</span></span>
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<pre style="margin: 0;">+<span id="LC1654" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Free coercion variables must be tracked in 'DVarSet' since</span></span>
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<pre style="margin: 0;">+<span id="LC1655" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- they appear in interface files.</span></span>
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<pre style="margin: 0;">+<span id="LC1656" class="line" lang="haskell"></span>
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1657
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<pre style="margin: 0;"> <span id="LC1657" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Data</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Data</span></span>
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1650
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1658
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<pre style="margin: 0;"> <span id="LC1658" class="line" lang="haskell"></span>
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1651
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1659
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<pre style="margin: 0;"> <span id="LC1659" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">UnivCoProvenance</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1661" 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">@@ -1653,6 +1661,7 @@ instance Outputable UnivCoProvenance where</td>
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1653
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1661
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<pre style="margin: 0;"> <span id="LC1661" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PhantomProv</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;">text</span> <span class="s" style="color: #d14;">"(phantom)"</span></span>
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1654
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1662
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<pre style="margin: 0;"> <span id="LC1662" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ProofIrrelProv</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;">text</span> <span class="s" style="color: #d14;">"(proof irrel.)"</span></span>
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1655
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1663
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<pre style="margin: 0;"> <span id="LC1663" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PluginProv</span> <span class="n" style="color: #333;">str</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">parens</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"plugin"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">brackets</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="n" style="color: #333;">str</span><span class="p">))</span></span>
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1664
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<pre style="margin: 0;">+<span id="LC1664" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ZappedProv</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">parens</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"zapped"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">brackets</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fvs</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC1665" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1666" class="line" lang="haskell"><span class="cd">-- | A coercion to be filled in by the type-checker. See Note [Coercion holes]</span></span>
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<pre style="margin: 0;"> <span id="LC1667" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">CoercionHole</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">@@ -1796,8 +1805,232 @@ Here,</td>
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1796
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1805
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<pre style="margin: 0;"> <span id="LC1805" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> where</span></span>
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1797
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1806
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<pre style="margin: 0;"> <span id="LC1806" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> co5 :: (a1 ~ Bool) ~ (a2 ~ Bool)</span></span>
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1798
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1807
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<pre style="margin: 0;"> <span id="LC1807" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> co5 = TyConAppCo Nominal (~#) [<*>, <*>, co4, <Bool>]</span></span>
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1808
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<pre style="margin: 0;">+<span id="LC1808" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1809
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<pre style="margin: 0;">+<span id="LC1809" class="line" lang="haskell"></span>
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1810
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<pre style="margin: 0;">+<span id="LC1810" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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<pre style="margin: 0;">+<span id="LC1811" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">%************************************************************************</span></span>
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<pre style="margin: 0;">+<span id="LC1812" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">%* *</span></span>
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<pre style="margin: 0;">+<span id="LC1813" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Zapping coercions into oblivion</span></span>
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<pre style="margin: 0;">+<span id="LC1814" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">%* *</span></span>
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1815
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<pre style="margin: 0;">+<span id="LC1815" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">%************************************************************************</span></span>
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1816
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<pre style="margin: 0;">+<span id="LC1816" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;">+<span id="LC1817" class="line" lang="haskell"></span>
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1818
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<pre style="margin: 0;">+<span id="LC1818" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Zapping coercions]</span></span>
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1819
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<pre style="margin: 0;">+<span id="LC1819" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1820
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<pre style="margin: 0;">+<span id="LC1820" class="line" lang="haskell"></span>
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1821
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<pre style="margin: 0;">+<span id="LC1821" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Coercions for even small programs can grow to be quite large (e.g. #8095),</span></span>
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1822
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<pre style="margin: 0;">+<span id="LC1822" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">especially when type families are involved. For instance, the case of addition</span></span>
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1823
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<pre style="margin: 0;">+<span id="LC1823" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of inductive naturals can build coercions quadratic in size of the summands.</span></span>
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<pre style="margin: 0;">+<span id="LC1824" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For instance, consider the type-level addition operation defined on Peano naturals,</span></span>
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1825
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<pre style="margin: 0;">+<span id="LC1825" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1826" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data Nat = Z | Succ Nat</span></span>
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1827
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<pre style="margin: 0;">+<span id="LC1827" class="line" lang="haskell"></span>
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1828
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<pre style="margin: 0;">+<span id="LC1828" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type family (+) (a :: Nat) (b :: Nat)</span></span>
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1829
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<pre style="margin: 0;">+<span id="LC1829" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type instance (+) Z a = a -- CoAx1</span></span>
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1830
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<pre style="margin: 0;">+<span id="LC1830" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type instance (+) (Succ a) b = Succ (a + b) -- CoAx2</span></span>
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1831
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1832
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<pre style="margin: 0;">+<span id="LC1832" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Now consider what is necessary to reduce (S (S (S Z)) + S Z). This</span></span>
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1833
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<pre style="margin: 0;">+<span id="LC1833" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">reduction will produce two results: the reduced (i.e. flattened) type, and a</span></span>
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1834
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<pre style="margin: 0;">+<span id="LC1834" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">coercion witnessing the reduction. The reduction will proceed as follows:</span></span>
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1835
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<pre style="margin: 0;">+<span id="LC1835" class="line" lang="haskell"></span>
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1836
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<pre style="margin: 0;">+<span id="LC1836" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> S (S (S Z)) + S Z |> Refl</span></span>
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1837
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<pre style="margin: 0;">+<span id="LC1837" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ~> S (S (S Z) + S Z) |> CoAx2 Refl</span></span>
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1838
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<pre style="margin: 0;">+<span id="LC1838" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ~> S (S (S Z + S Z)) |> CoAx2 (CoAx2 Refl)</span></span>
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1839
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<pre style="margin: 0;">+<span id="LC1839" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ~> S (S (S (Z + S Z))) |> CoAx2 (CoAx2 (CoAx2 Refl))</span></span>
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1840
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<pre style="margin: 0;">+<span id="LC1840" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ~> S (S (S (S (S Z)))) |> CoAx1 (CoAx2 (CoAx2 (CoAx2 Refl)))</span></span>
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1841
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<pre style="margin: 0;">+<span id="LC1841" class="line" lang="haskell"></span>
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1842
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<pre style="margin: 0;">+<span id="LC1842" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that when we are building coercions [TODO]</span></span>
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1843
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<pre style="margin: 0;">+<span id="LC1843" class="line" lang="haskell"></span>
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1844
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<pre style="margin: 0;">+<span id="LC1844" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Moreover, coercions are really only useful when validating core transformations</span></span>
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1845
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<pre style="margin: 0;">+<span id="LC1845" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(i.e. by the Core Linter). To avoid burdening users who aren't linting with the</span></span>
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1846
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<pre style="margin: 0;">+<span id="LC1846" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">cost of maintaining these structures, we replace coercions with placeholders</span></span>
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1847
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<pre style="margin: 0;">+<span id="LC1847" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">("zap" them) them unless -dcore-lint is enabled. These placeholders are</span></span>
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1848
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<pre style="margin: 0;">+<span id="LC1848" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">represented by UnivCo with ZappedProv provenance. Concretely, a coercion</span></span>
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1849
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<pre style="margin: 0;">+<span id="LC1849" class="line" lang="haskell"></span>
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1850
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<pre style="margin: 0;">+<span id="LC1850" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> co :: t1 ~r t2</span></span>
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1851
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<pre style="margin: 0;">+<span id="LC1851" class="line" lang="haskell"></span>
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1852
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<pre style="margin: 0;">+<span id="LC1852" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is replaced by</span></span>
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1853
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<pre style="margin: 0;">+<span id="LC1853" class="line" lang="haskell"></span>
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1854
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<pre style="margin: 0;">+<span id="LC1854" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> UnivCo (ZappedProv fvs) r t1 t2</span></span>
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1855
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<pre style="margin: 0;">+<span id="LC1855" class="line" lang="haskell"></span>
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1856
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<pre style="margin: 0;">+<span id="LC1856" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">To ensure that such coercions aren't floated out of the scope of proofs they</span></span>
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1857
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<pre style="margin: 0;">+<span id="LC1857" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">require, the ZappedProv constructor includes the coercion's set of free coercion</span></span>
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1858
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<pre style="margin: 0;">+<span id="LC1858" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">variables (as a DVarSet, since these sets are included in interface files).</span></span>
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1859
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<pre style="margin: 0;">+<span id="LC1859" class="line" lang="haskell"></span>
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1860
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<pre style="margin: 0;">+<span id="LC1860" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1861" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Zapping during type family reduction</span></span>
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1862
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<pre style="margin: 0;">+<span id="LC1862" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">------------------------------------</span></span>
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1863
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<pre style="margin: 0;">+<span id="LC1863" class="line" lang="haskell"></span>
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1864
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<pre style="margin: 0;">+<span id="LC1864" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">To avoid the quadratic blow-up in coercion size during type family reduction</span></span>
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1865
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<pre style="margin: 0;">+<span id="LC1865" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">described above, we zap on every type family reduction step taken by</span></span>
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1866
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<pre style="margin: 0;">+<span id="LC1866" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">TcFlatten.flatten_exact_fam_app_fully. When zapping we take care to avoid</span></span>
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1867
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<pre style="margin: 0;">+<span id="LC1867" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">looking at the constructed coercion and instead build up a zapped coercion</span></span>
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1868
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<pre style="margin: 0;">+<span id="LC1868" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">directly from type being reduced, its free variables, and the result of the</span></span>
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1869
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<pre style="margin: 0;">+<span id="LC1869" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">reduction. This allows us to reduce recursive type families in time linear to</span></span>
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1870
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<pre style="margin: 0;">+<span id="LC1870" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the size of the type at the expense of Core Lint's ability to validate the</span></span>
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1871
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<pre style="margin: 0;">+<span id="LC1871" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">reduction.</span></span>
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1872
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<pre style="margin: 0;">+<span id="LC1872" class="line" lang="haskell"></span>
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1873
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<pre style="margin: 0;">+<span id="LC1873" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that the free variable set of the zapped coercion is taken to be the free</span></span>
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1874
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<pre style="margin: 0;">+<span id="LC1874" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">variable set of the unreduced family application, which is computed once at the</span></span>
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1875
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<pre style="margin: 0;">+<span id="LC1875" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">beginning of reduction. This is an important optimisation as it allows us to</span></span>
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1876
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<pre style="margin: 0;">+<span id="LC1876" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">avoid recomputing the free variable set (which requires linear work in the size</span></span>
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1877
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<pre style="margin: 0;">+<span id="LC1877" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of the coercion) with every reduction step. Moreover, this gives us the same</span></span>
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1878
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<pre style="margin: 0;">+<span id="LC1878" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">result as naively computing the free variables of every reduction:</span></span>
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1879
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<pre style="margin: 0;">+<span id="LC1879" class="line" lang="haskell"></span>
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1880
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<pre style="margin: 0;">+<span id="LC1880" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * The FV set of the unreduced type cannot be smaller than that of the reduced type</span></span>
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1881
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<pre style="margin: 0;">+<span id="LC1881" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> because there is nowhere for extra FVs to come from. Type family equations</span></span>
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1882
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<pre style="margin: 0;">+<span id="LC1882" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> are essentially function reduction, which can never introduce new fvs.</span></span>
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1883
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<pre style="margin: 0;">+<span id="LC1883" class="line" lang="haskell"></span>
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1884
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<pre style="margin: 0;">+<span id="LC1884" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * The FV set of the unreducecd type cannot be larger than that of the reduced</span></span>
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1885
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<pre style="margin: 0;">+<span id="LC1885" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type because the zapped coercion's kind must mention the types these fvs come</span></span>
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1886
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<pre style="margin: 0;">+<span id="LC1886" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> from, so the FVs of the zapped coercion must be at least those in the</span></span>
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1887
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<pre style="margin: 0;">+<span id="LC1887" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> starting types.</span></span>
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1888
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<pre style="margin: 0;">+<span id="LC1888" class="line" lang="haskell"></span>
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1889
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<pre style="margin: 0;">+<span id="LC1889" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Thus, the two sets are subsets of each other and are equal.</span></span>
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1890
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<pre style="margin: 0;">+<span id="LC1890" class="line" lang="haskell"></span>
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1891
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<pre style="margin: 0;">+<span id="LC1891" class="line" lang="haskell"></span>
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1892
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<pre style="margin: 0;">+<span id="LC1892" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Other places where we zap</span></span>
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1893
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<pre style="margin: 0;">+<span id="LC1893" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-------------------------</span></span>
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1799
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1894
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<pre style="margin: 0;"> <span id="LC1894" class="line" lang="haskell"></span>
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1895
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<pre style="margin: 0;">+<span id="LC1895" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Besides during type family reduction, we also zap coercions in a number of other</span></span>
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1896
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<pre style="margin: 0;">+<span id="LC1896" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">places (again, only when DynFlags.shouldBuildCoercions is False). This zapping</span></span>
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1897
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<pre style="margin: 0;">+<span id="LC1897" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">occurs in zapCoercion, which maps a coercion to its zapped form. However, there</span></span>
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1898
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<pre style="margin: 0;">+<span id="LC1898" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">are a few optimisations which we implement:</span></span>
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1800
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1899
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<pre style="margin: 0;"> <span id="LC1899" class="line" lang="haskell"></span>
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1900
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<pre style="margin: 0;">+<span id="LC1900" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * We don't zap coercions which are already zapping; this avoids an unnecessary</span></span>
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1901
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<pre style="margin: 0;">+<span id="LC1901" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> free variable computation.</span></span>
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1902
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<pre style="margin: 0;">+<span id="LC1902" class="line" lang="haskell"></span>
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1903
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<pre style="margin: 0;">+<span id="LC1903" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * We don't zap Refl coercions. This is because Refls are actually far more</span></span>
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1904
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<pre style="margin: 0;">+<span id="LC1904" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> compact than zapped coercions: the coercion (Refl T) holds only one</span></span>
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1905
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<pre style="margin: 0;">+<span id="LC1905" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> reference to T, whereas its zapped equivalent would hold two. While this</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1906" 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">
1906
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<pre style="margin: 0;">+<span id="LC1906" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> makes little difference directly after construction due to sharing, this</span></span>
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1907
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<pre style="margin: 0;">+<span id="LC1907" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> sharing will be lost when we substitute or otherwise manipulate the zapped</span></span>
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1908
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<pre style="margin: 0;">+<span id="LC1908" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> coercion, resulting in a doubling of the coercions representation size.</span></span>
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1909
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<pre style="margin: 0;">+<span id="LC1909" class="line" lang="haskell"></span>
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1910
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<pre style="margin: 0;">+<span id="LC1910" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">zapCoercion is called in a few places:</span></span>
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1911
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<pre style="margin: 0;">+<span id="LC1911" class="line" lang="haskell"></span>
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1912
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<pre style="margin: 0;">+<span id="LC1912" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * CoreOpt.pushCoTyArg zaps the coercions it produces to avoid pile-up during</span></span>
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1913
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<pre style="margin: 0;">+<span id="LC1913" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> simplification [TODO]</span></span>
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1914
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<pre style="margin: 0;">+<span id="LC1914" class="line" lang="haskell"></span>
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1915
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<pre style="margin: 0;">+<span id="LC1915" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * TcIface.tcIfaceCo</span></span>
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1916
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<pre style="margin: 0;">+<span id="LC1916" class="line" lang="haskell"></span>
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1917
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<pre style="margin: 0;">+<span id="LC1917" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Type.mapCoercion (which is used by zonking) can optionally zap coercions,</span></span>
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1918
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<pre style="margin: 0;">+<span id="LC1918" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> although this is currently disabled since it causes compiler allocations to</span></span>
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1919
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<pre style="margin: 0;">+<span id="LC1919" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> regress in a few cases.</span></span>
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1920
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<pre style="margin: 0;">+<span id="LC1920" class="line" lang="haskell"></span>
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1921
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<pre style="margin: 0;">+<span id="LC1921" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * We considered zapping as well in optCoercion, although this too caused</span></span>
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1922
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<pre style="margin: 0;">+<span id="LC1922" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> significant allocation regressions.</span></span>
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1923
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<pre style="margin: 0;">+<span id="LC1923" class="line" lang="haskell"></span>
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1924
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<pre style="margin: 0;">+<span id="LC1924" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The importance of tracking free coercion variables</span></span>
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1925
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<pre style="margin: 0;">+<span id="LC1925" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">--------------------------------------------------</span></span>
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1926
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<pre style="margin: 0;">+<span id="LC1926" class="line" lang="haskell"></span>
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1927
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<pre style="margin: 0;">+<span id="LC1927" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">It is quite important that zapped coercions track their free coercion variables.</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1928" 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">
1928
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<pre style="margin: 0;">+<span id="LC1928" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">To see why, consider this program:</span></span>
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1929
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<pre style="margin: 0;">+<span id="LC1929" class="line" lang="haskell"></span>
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1930
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<pre style="margin: 0;">+<span id="LC1930" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T a where</span></span>
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1931
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<pre style="margin: 0;">+<span id="LC1931" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> T1 :: Bool -> T Bool</span></span>
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1932
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<pre style="margin: 0;">+<span id="LC1932" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> T2 :: T Int</span></span>
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1933
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<pre style="margin: 0;">+<span id="LC1933" class="line" lang="haskell"></span>
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1934
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<pre style="margin: 0;">+<span id="LC1934" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: T a -> a -> Bool</span></span>
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1935
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<pre style="margin: 0;">+<span id="LC1935" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f = /\a (x:T a) (y:a).</span></span>
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1936
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<pre style="margin: 0;">+<span id="LC1936" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> case x of</span></span>
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1937
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<pre style="margin: 0;">+<span id="LC1937" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> T1 (c : a~Bool) (z : Bool) -> not (y |> c)</span></span>
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1938
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<pre style="margin: 0;">+<span id="LC1938" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> T2 -> True</span></span>
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1939
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<pre style="margin: 0;">+<span id="LC1939" class="line" lang="haskell"></span>
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1940
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<pre style="margin: 0;">+<span id="LC1940" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Now imagine that we zap the coercion `c`, replacing it with a generic UnivCo</span></span>
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1941
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<pre style="margin: 0;">+<span id="LC1941" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">between `a` and Bool. If we didn't record the fact that this coercion was</span></span>
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1942
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<pre style="margin: 0;">+<span id="LC1942" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">previously free in `c`, we may incorrectly float the expression `not (y |> c)`</span></span>
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1943
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<pre style="margin: 0;">+<span id="LC1943" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">out of the case alternative which brings proof of `c` into scope. If this</span></span>
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1944
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<pre style="margin: 0;">+<span id="LC1944" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">happened then `f T2 (I# 5)` would try to interpret `y` as a Bool, at</span></span>
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1945
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<pre style="margin: 0;">+<span id="LC1945" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">which point we aren't far from a segmentation fault or much worse.</span></span>
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1946
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<pre style="margin: 0;">+<span id="LC1946" class="line" lang="haskell"></span>
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1947
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<pre style="margin: 0;">+<span id="LC1947" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that we don't need to track the coercion's free *type* variables. This</span></span>
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1948
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<pre style="margin: 0;">+<span id="LC1948" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">means that we may float past type variables which the original proof had as free</span></span>
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1949
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<pre style="margin: 0;">+<span id="LC1949" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">variables. While surprising, this doesn't jeopardise the validity of the</span></span>
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1950
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<pre style="margin: 0;">+<span id="LC1950" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">coercion, which only depends upon the scoping relative to the free coercion</span></span>
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1951
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<pre style="margin: 0;">+<span id="LC1951" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">variables.</span></span>
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1952
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<pre style="margin: 0;">+<span id="LC1952" class="line" lang="haskell"></span>
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1953
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<pre style="margin: 0;">+<span id="LC1953" class="line" lang="haskell"></span>
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1954
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<pre style="margin: 0;">+<span id="LC1954" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Differences between zapped and unzapped coercions</span></span>
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1955
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<pre style="margin: 0;">+<span id="LC1955" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-------------------------------------------------</span></span>
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1956
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<pre style="margin: 0;">+<span id="LC1956" class="line" lang="haskell"></span>
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1957
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<pre style="margin: 0;">+<span id="LC1957" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Alas, sometimes zapped coercions will behave slightly differently from their</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1958" 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">
1958
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<pre style="margin: 0;">+<span id="LC1958" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">unzapped counterparts. Specifically, we are a bit lax in tracking external names</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1959" 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">
1959
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<pre style="margin: 0;">+<span id="LC1959" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that are present in the unzapped coercion but not its kind. This manifests in a</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1960" 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">
1960
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<pre style="margin: 0;">+<span id="LC1960" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">few places (these are labelled in the source with the [ZappedCoDifference]</span></span>
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1961
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<pre style="margin: 0;">+<span id="LC1961" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">keyword):</span></span>
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1962
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<pre style="margin: 0;">+<span id="LC1962" class="line" lang="haskell"></span>
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<td class="diff-line-num new new_line" data-linenumber="1963" 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">
1963
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<pre style="margin: 0;">+<span id="LC1963" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Since we only track a zapped coercion's free *coercion* variables, the</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1964" 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">
1964
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<pre style="margin: 0;">+<span id="LC1964" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> simplifier may float such coercions farther than it would have if the proof</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1965" 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">
1965
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<pre style="margin: 0;">+<span id="LC1965" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> were present.</span></span>
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1966
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<pre style="margin: 0;">+<span id="LC1966" class="line" lang="haskell"></span>
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<td class="diff-line-num new new_line" data-linenumber="1967" 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">
1967
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<pre style="margin: 0;">+<span id="LC1967" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * IfaceSyn.freeNamesIfCoercion will fail to report top-level names present in</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1968" 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">
1968
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<pre style="margin: 0;">+<span id="LC1968" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the unzapped proof but not its kind.</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1969" 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">
1969
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<pre style="margin: 0;">+<span id="LC1969" class="line" lang="haskell"></span>
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<td class="diff-line-num new new_line" data-linenumber="1970" 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">
1970
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<pre style="margin: 0;">+<span id="LC1970" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * TcTyDecls.synonymTyConsOfType will fail to report type synonyms present in</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1971" 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">
1971
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<pre style="margin: 0;">+<span id="LC1971" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in the unzapped proof but not its kind.</span></span>
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1972
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<pre style="margin: 0;">+<span id="LC1972" class="line" lang="haskell"></span>
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<td class="diff-line-num new new_line" data-linenumber="1973" 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">
1973
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<pre style="margin: 0;">+<span id="LC1973" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * The result of TcValidity.fvCo will contain each free variable of a ZappedCo</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1974" 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">
1974
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<pre style="margin: 0;">+<span id="LC1974" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> only once, even if it would have reported multiple occurrences in the</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1975" 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">
1975
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<pre style="margin: 0;">+<span id="LC1975" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> unzapped coercion.</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1976" 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">
1976
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<pre style="margin: 0;">+<span id="LC1976" class="line" lang="haskell"></span>
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<td class="diff-line-num new new_line" data-linenumber="1977" 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">
1977
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<pre style="margin: 0;">+<span id="LC1977" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Type.tyConsOfType does not report TyCons which appear only in the unzapped</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1978" 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">
1978
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<pre style="margin: 0;">+<span id="LC1978" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> proof and not its kind.</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1979" 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">
1979
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<pre style="margin: 0;">+<span id="LC1979" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="1980" 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">
1980
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<pre style="margin: 0;">+<span id="LC1980" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Zapped coercions are represented in interface files as IfaceZappedProv. This</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1981" 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">
1981
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<pre style="margin: 0;">+<span id="LC1981" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> representation only includes local free variables, since these are sufficient</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1982" 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">
1982
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<pre style="margin: 0;">+<span id="LC1982" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> to avoid unsound floating. This means that the free variable lists of zapped</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1983" 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">
1983
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<pre style="margin: 0;">+<span id="LC1983" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> coercions loaded from interface files will lack top-level things (e.g. type</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1984" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1984
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<pre style="margin: 0;">+<span id="LC1984" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> constructors) that appear only in the unzapped proof.</span></span>
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1985
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<pre style="margin: 0;">+<span id="LC1985" class="line" lang="haskell"></span>
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<td class="diff-line-num new new_line" data-linenumber="1986" 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">
1986
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<pre style="margin: 0;">+<span id="LC1986" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1987
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<pre style="margin: 0;">+<span id="LC1987" class="line" lang="haskell"></span>
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1988
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<pre style="margin: 0;">+<span id="LC1988" class="line" lang="haskell"><span class="cd">-- | Make a zapped coercion if building of coercions is disabled, otherwise</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1989" 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">
1989
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<pre style="margin: 0;">+<span id="LC1989" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- return the given un-zapped coercion.</span></span>
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1990
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<pre style="margin: 0;">+<span id="LC1990" class="line" lang="haskell"><span class="n" style="color: #333;">mkZappedCoercion</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HasDebugCallStack</span></span>
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1991
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<pre style="margin: 0;">+<span id="LC1991" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span></span>
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1992
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<pre style="margin: 0;">+<span id="LC1992" 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;">-- ^ the un-zapped coercion</span></span>
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1993
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<pre style="margin: 0;">+<span id="LC1993" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Pair</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ the kind of the coercion</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1994" 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">
1994
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<pre style="margin: 0;">+<span id="LC1994" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Role</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ the role of the coercion</span></span>
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1995
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<pre style="margin: 0;">+<span id="LC1995" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DCoVarSet</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ the free coercion variables of the coercion</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1996" 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">
1996
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<pre style="margin: 0;">+<span id="LC1996" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1997" 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">
1997
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<pre style="margin: 0;">+<span id="LC1997" class="line" lang="haskell"><span class="n" style="color: #333;">mkZappedCoercion</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">co</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Pair</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">fCvs</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1998" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1998
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<pre style="margin: 0;">+<span id="LC1998" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">debugIsOn</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">is_ok</span> <span class="o" style="font-weight: 600;">=</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1999" 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">
1999
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<pre style="margin: 0;">+<span id="LC1999" class="line" lang="haskell"> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"mkZappedCoercion"</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">vcat</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2000" 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">
2000
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<pre style="margin: 0;">+<span id="LC2000" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"real role:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">real_role</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2001" 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">
2001
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<pre style="margin: 0;">+<span id="LC2001" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"given role:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">role</span></span>
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2002
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<pre style="margin: 0;">+<span id="LC2002" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"real ty1:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">real_ty1</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2003" 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">
2003
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<pre style="margin: 0;">+<span id="LC2003" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"given ty1:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty1</span></span>
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2004
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<pre style="margin: 0;">+<span id="LC2004" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"real ty2:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">real_ty2</span></span>
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2005
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<pre style="margin: 0;">+<span id="LC2005" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"given ty2:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty2</span></span>
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2006
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<pre style="margin: 0;">+<span id="LC2006" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"real free co vars:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">real_fCvs</span></span>
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2007
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<pre style="margin: 0;">+<span id="LC2007" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"given free co vars:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fCvs</span></span>
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2008
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<pre style="margin: 0;">+<span id="LC2008" class="line" lang="haskell"> <span class="p">]</span></span>
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2009
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<pre style="margin: 0;">+<span id="LC2009" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">shouldBuildCoercions</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">co</span></span>
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2010
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<pre style="margin: 0;">+<span id="LC2010" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span></span>
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2011
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<pre style="margin: 0;">+<span id="LC2011" class="line" lang="haskell"> <span class="n" style="color: #333;">mkUnivCo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ZappedProv</span> <span class="n" style="color: #333;">fCvs</span><span class="p">)</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span></span>
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2012
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<pre style="margin: 0;">+<span id="LC2012" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2013
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<pre style="margin: 0;">+<span id="LC2013" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Pair</span> <span class="n" style="color: #333;">real_ty1</span> <span class="n" style="color: #333;">real_ty2</span><span class="p">,</span> <span class="n" style="color: #333;">real_role</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">coercionKindRole</span> <span class="n" style="color: #333;">co</span></span>
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2014
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<pre style="margin: 0;">+<span id="LC2014" class="line" lang="haskell"> <span class="n" style="color: #333;">real_fCvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filterVarSet</span> <span class="n" style="color: #333;">isCoVar</span> <span class="p">(</span><span class="n" style="color: #333;">coVarsOfCo</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>
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2015
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<pre style="margin: 0;">+<span id="LC2015" class="line" lang="haskell"> <span class="n" style="color: #333;">is_ok</span> <span class="o" style="font-weight: 600;">=</span></span>
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2016
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<pre style="margin: 0;">+<span id="LC2016" class="line" lang="haskell"> <span class="n" style="color: #333;">real_role</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">role</span></span>
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2017
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<pre style="margin: 0;">+<span id="LC2017" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">&&</span> <span class="p">(</span><span class="n" style="color: #333;">real_ty1</span> <span class="p">`</span><span class="n" style="color: #333;">eqType</span><span class="p">`</span> <span class="n" style="color: #333;">ty1</span><span class="p">)</span></span>
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2018
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<pre style="margin: 0;">+<span id="LC2018" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">&&</span> <span class="p">(</span><span class="n" style="color: #333;">real_ty2</span> <span class="p">`</span><span class="n" style="color: #333;">eqType</span><span class="p">`</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span></span>
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2019
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<pre style="margin: 0;">+<span id="LC2019" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- It's not generally possible to compute the actual free variable set</span></span>
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2020
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<pre style="margin: 0;">+<span id="LC2020" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- since we may encounter flattening skolems during reduction.</span></span>
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2021
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<pre style="margin: 0;">+<span id="LC2021" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- && dVarSetToVarSet fCvs == real_fCvs</span></span>
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2022
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<pre style="margin: 0;">+<span id="LC2022" class="line" lang="haskell"></span>
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2023
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<pre style="margin: 0;">+<span id="LC2023" class="line" lang="haskell"><span class="cd">-- | Replace a coercion with a zapped coercion unless coercions are needed.</span></span>
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2024
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<pre style="margin: 0;">+<span id="LC2024" class="line" lang="haskell"><span class="n" style="color: #333;">zapCoercion</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span></span>
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2025
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<pre style="margin: 0;">+<span id="LC2025" class="line" lang="haskell"><span class="n" style="color: #333;">zapCoercion</span> <span class="kr" style="font-weight: 600;">_</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="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ZappedProv</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</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;">co</span> <span class="c1" style="color: #998; font-style: italic;">-- already zapped</span></span>
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2026
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<pre style="margin: 0;">+<span id="LC2026" class="line" lang="haskell"><span class="n" style="color: #333;">zapCoercion</span> <span class="kr" style="font-weight: 600;">_</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;">Refl</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;">co</span> <span class="c1" style="color: #998; font-style: italic;">-- Refl is smaller than zapped coercions</span></span>
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2027
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<pre style="margin: 0;">+<span id="LC2027" class="line" lang="haskell"><span class="n" style="color: #333;">zapCoercion</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">=</span></span>
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2028
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<pre style="margin: 0;">+<span id="LC2028" class="line" lang="haskell"> <span class="n" style="color: #333;">mkZappedCoercion</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">co</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Pair</span> <span class="n" style="color: #333;">t1</span> <span class="n" style="color: #333;">t2</span><span class="p">)</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">fvs</span></span>
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2029
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<pre style="margin: 0;">+<span id="LC2029" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2030
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<pre style="margin: 0;">+<span id="LC2030" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Pair</span> <span class="n" style="color: #333;">t1</span> <span class="n" style="color: #333;">t2</span><span class="p">,</span> <span class="n" style="color: #333;">role</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">coercionKindRole</span> <span class="n" style="color: #333;">co</span></span>
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2031
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<pre style="margin: 0;">+<span id="LC2031" class="line" lang="haskell"> <span class="n" style="color: #333;">fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filterDVarSet</span> <span class="n" style="color: #333;">isCoVar</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tyCoVarsOfCoDSet</span> <span class="n" style="color: #333;">co</span></span>
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2032
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<pre style="margin: 0;">+<span id="LC2032" class="line" lang="haskell"></span>
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2033
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<pre style="margin: 0;">+<span id="LC2033" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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1801
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2034
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<pre style="margin: 0;"> <span id="LC2034" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">%************************************************************************</span></span>
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1802
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2035
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<pre style="margin: 0;"> <span id="LC2035" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">%* *</span></span>
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1803
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2036
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<pre style="margin: 0;"> <span id="LC2036" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Free variables of types and coercions</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1820" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2053" 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">@@ -1820,7 +2053,7 @@ instead do so at call sites, but it seems that we always want to do</td>
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1820
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2053
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<pre style="margin: 0;"> <span id="LC2053" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">so, so it's easiest to do it here.</span></span>
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1821
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2054
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<pre style="margin: 0;"> <span id="LC2054" class="line" lang="haskell"></span>
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1822
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2055
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<pre style="margin: 0;"> <span id="LC2055" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">It turns out that getting the free variables of types is performance critical,</span></span>
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1823
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<pre style="margin: 0;">-<span id="LC1823" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">s</span>o we profiled several versions, exploring different implementation strategies.</span></span>
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2056
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<pre style="margin: 0;">+<span id="LC2056" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">o we profiled several versions, exploring different implementation strategies.</span></span>
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1824
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2057
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<pre style="margin: 0;"> <span id="LC2057" class="line" lang="haskell"></span>
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1825
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2058
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<pre style="margin: 0;"> <span id="LC2058" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1. Baseline version: uses FV naively. Essentially:</span></span>
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1826
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2059
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<pre style="margin: 0;"> <span id="LC2059" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2013" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2246" 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">@@ -2013,6 +2246,7 @@ ty_co_vars_of_prov (PhantomProv co) is acc = ty_co_vars_of_co co is acc</td>
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2013
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2246
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<pre style="margin: 0;"> <span id="LC2246" class="line" lang="haskell"><span class="n" style="color: #333;">ty_co_vars_of_prov</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ProofIrrelProv</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="n" style="color: #333;">is</span> <span class="n" style="color: #333;">acc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty_co_vars_of_co</span> <span class="n" style="color: #333;">co</span> <span class="n" style="color: #333;">is</span> <span class="n" style="color: #333;">acc</span></span>
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2014
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2247
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<pre style="margin: 0;"> <span id="LC2247" class="line" lang="haskell"><span class="n" style="color: #333;">ty_co_vars_of_prov</span> <span class="kt" style="color: #458; font-weight: 600;">UnsafeCoerceProv</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">acc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">acc</span></span>
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2015
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2248
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<pre style="margin: 0;"> <span id="LC2248" class="line" lang="haskell"><span class="n" style="color: #333;">ty_co_vars_of_prov</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PluginProv</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">acc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">acc</span></span>
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2249
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<pre style="margin: 0;">+<span id="LC2249" class="line" lang="haskell"><span class="n" style="color: #333;">ty_co_vars_of_prov</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ZappedProv</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">acc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dVarSetToVarSet</span> <span class="n" style="color: #333;">fvs</span></span>
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2016
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2250
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<pre style="margin: 0;"> <span id="LC2250" class="line" lang="haskell"></span>
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2017
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2251
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<pre style="margin: 0;"> <span id="LC2251" class="line" lang="haskell"><span class="cd">-- | Generates an in-scope set from the free variables in a list of types</span></span>
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2018
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2252
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<pre style="margin: 0;"> <span id="LC2252" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- and a list of coercions</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2394" 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">@@ -2160,6 +2394,7 @@ tyCoFVsOfProv UnsafeCoerceProv fv_cand in_scope acc = emptyFV fv_cand in_scop</td>
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2160
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2394
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<pre style="margin: 0;"> <span id="LC2394" class="line" lang="haskell"><span class="n" style="color: #333;">tyCoFVsOfProv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PhantomProv</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="n" style="color: #333;">fv_cand</span> <span class="n" style="color: #333;">in_scope</span> <span class="n" style="color: #333;">acc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyCoFVsOfCo</span> <span class="n" style="color: #333;">co</span> <span class="n" style="color: #333;">fv_cand</span> <span class="n" style="color: #333;">in_scope</span> <span class="n" style="color: #333;">acc</span></span>
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2161
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2395
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<pre style="margin: 0;"> <span id="LC2395" class="line" lang="haskell"><span class="n" style="color: #333;">tyCoFVsOfProv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ProofIrrelProv</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="n" style="color: #333;">fv_cand</span> <span class="n" style="color: #333;">in_scope</span> <span class="n" style="color: #333;">acc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyCoFVsOfCo</span> <span class="n" style="color: #333;">co</span> <span class="n" style="color: #333;">fv_cand</span> <span class="n" style="color: #333;">in_scope</span> <span class="n" style="color: #333;">acc</span></span>
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2162
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2396
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<pre style="margin: 0;"> <span id="LC2396" class="line" lang="haskell"><span class="n" style="color: #333;">tyCoFVsOfProv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PluginProv</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="n" style="color: #333;">fv_cand</span> <span class="n" style="color: #333;">in_scope</span> <span class="n" style="color: #333;">acc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyFV</span> <span class="n" style="color: #333;">fv_cand</span> <span class="n" style="color: #333;">in_scope</span> <span class="n" style="color: #333;">acc</span></span>
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2397
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<pre style="margin: 0;">+<span id="LC2397" class="line" lang="haskell"><span class="n" style="color: #333;">tyCoFVsOfProv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ZappedProv</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="n" style="color: #333;">fv_cand</span> <span class="n" style="color: #333;">in_scope</span> <span class="n" style="color: #333;">acc</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">mkFVs</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">dVarSetElems</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="n" style="color: #333;">fv_cand</span> <span class="n" style="color: #333;">in_scope</span> <span class="n" style="color: #333;">acc</span></span>
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2163
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2398
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<pre style="margin: 0;"> <span id="LC2398" class="line" lang="haskell"></span>
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2164
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2399
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<pre style="margin: 0;"> <span id="LC2399" class="line" lang="haskell"><span class="n" style="color: #333;">tyCoFVsOfCos</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Coercion</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FV</span></span>
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2165
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2400
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<pre style="margin: 0;"> <span id="LC2400" class="line" lang="haskell"><span class="n" style="color: #333;">tyCoFVsOfCos</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">fv_cand</span> <span class="n" style="color: #333;">in_scope</span> <span class="n" style="color: #333;">acc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyFV</span> <span class="n" style="color: #333;">fv_cand</span> <span class="n" style="color: #333;">in_scope</span> <span class="n" style="color: #333;">acc</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2265" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2500" 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">@@ -2265,6 +2500,7 @@ almost_devoid_co_var_of_prov (ProofIrrelProv co) cv</td>
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2265
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2500
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<pre style="margin: 0;"> <span id="LC2500" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">almost_devoid_co_var_of_co</span> <span class="n" style="color: #333;">co</span> <span class="n" style="color: #333;">cv</span></span>
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2266
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2501
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<pre style="margin: 0;"> <span id="LC2501" class="line" lang="haskell"><span class="n" style="color: #333;">almost_devoid_co_var_of_prov</span> <span class="kt" style="color: #458; font-weight: 600;">UnsafeCoerceProv</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;">True</span></span>
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2267
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2502
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<pre style="margin: 0;"> <span id="LC2502" class="line" lang="haskell"><span class="n" style="color: #333;">almost_devoid_co_var_of_prov</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PluginProv</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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2503
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<pre style="margin: 0;">+<span id="LC2503" class="line" lang="haskell"><span class="n" style="color: #333;">almost_devoid_co_var_of_prov</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ZappedProv</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="n" style="color: #333;">cv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cv</span> <span class="p">`</span><span class="n" style="color: #333;">elemDVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">fvs</span></span>
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2268
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2504
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<pre style="margin: 0;"> <span id="LC2504" class="line" lang="haskell"></span>
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2269
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2505
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<pre style="margin: 0;"> <span id="LC2505" class="line" lang="haskell"><span class="n" style="color: #333;">almost_devoid_co_var_of_type</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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2270
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2506
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<pre style="margin: 0;"> <span id="LC2506" class="line" lang="haskell"><span class="n" style="color: #333;">almost_devoid_co_var_of_type</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyVarTy</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2651" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2887" 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">@@ -2651,6 +2887,7 @@ noFreeVarsOfProv UnsafeCoerceProv = True</td>
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2651
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2887
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<pre style="margin: 0;"> <span id="LC2887" class="line" lang="haskell"><span class="n" style="color: #333;">noFreeVarsOfProv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PhantomProv</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">noFreeVarsOfCo</span> <span class="n" style="color: #333;">co</span></span>
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2652
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2888
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<pre style="margin: 0;"> <span id="LC2888" class="line" lang="haskell"><span class="n" style="color: #333;">noFreeVarsOfProv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ProofIrrelProv</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">noFreeVarsOfCo</span> <span class="n" style="color: #333;">co</span></span>
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2653
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2889
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<pre style="margin: 0;"> <span id="LC2889" class="line" lang="haskell"><span class="n" style="color: #333;">noFreeVarsOfProv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PluginProv</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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2890
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<pre style="margin: 0;">+<span id="LC2890" class="line" lang="haskell"><span class="n" style="color: #333;">noFreeVarsOfProv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ZappedProv</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isEmptyDVarSet</span> <span class="n" style="color: #333;">fvs</span></span>
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2654
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2891
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<pre style="margin: 0;"> <span id="LC2891" class="line" lang="haskell"></span>
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2655
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2892
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<pre style="margin: 0;"> <span id="LC2892" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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2656
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2893
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<pre style="margin: 0;"> <span id="LC2893" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">%************************************************************************</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="3628" 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">@@ -3391,11 +3628,20 @@ subst_co subst co</td>
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3391
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3628
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<pre style="margin: 0;"> <span id="LC3628" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PhantomProv</span> <span class="n" style="color: #333;">kco</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PhantomProv</span> <span class="p">(</span><span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">kco</span><span class="p">)</span></span>
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3392
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3629
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<pre style="margin: 0;"> <span id="LC3629" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ProofIrrelProv</span> <span class="n" style="color: #333;">kco</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ProofIrrelProv</span> <span class="p">(</span><span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">kco</span><span class="p">)</span></span>
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3393
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3630
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<pre style="margin: 0;"> <span id="LC3630" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="n" style="color: #333;">p</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PluginProv</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;">p</span></span>
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3631
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<pre style="margin: 0;">+<span id="LC3631" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ZappedProv</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ZappedProv</span> <span class="p">(</span><span class="n" style="color: #333;">filterDVarSet</span> <span class="n" style="color: #333;">isCoVar</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">substFreeDVarSet</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span></span>
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3394
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3632
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<pre style="margin: 0;"> <span id="LC3632" class="line" lang="haskell"></span>
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3395
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3633
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<pre style="margin: 0;"> <span id="LC3633" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Substituting in a coercion hole]</span></span>
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3396
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3634
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<pre style="margin: 0;"> <span id="LC3634" class="line" lang="haskell"> <span class="n" style="color: #333;">go_hole</span> <span class="n" style="color: #333;">h</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoercionHole</span> <span class="p">{</span> <span class="n" style="color: #333;">ch_co_var</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cv</span> <span class="p">})</span></span>
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3397
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3635
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<pre style="margin: 0;"> <span id="LC3635" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">h</span> <span class="p">{</span> <span class="n" style="color: #333;">ch_co_var</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">updateVarType</span> <span class="n" style="color: #333;">go_ty</span> <span class="n" style="color: #333;">cv</span> <span class="p">}</span></span>
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3398
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3636
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<pre style="margin: 0;"> <span id="LC3636" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3637" class="line" lang="haskell"><span class="cd">-- | Perform a substitution within a 'DVarSet' of free variables.</span></span>
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3638
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<pre style="margin: 0;">+<span id="LC3638" class="line" lang="haskell"><span class="n" style="color: #333;">substFreeDVarSet</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DVarSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DVarSet</span></span>
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3639
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<pre style="margin: 0;">+<span id="LC3639" class="line" lang="haskell"><span class="n" style="color: #333;">substFreeDVarSet</span> <span class="n" style="color: #333;">subst</span> <span class="o" style="font-weight: 600;">=</span></span>
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3640
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<pre style="margin: 0;">+<span id="LC3640" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">v</span></span>
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3641
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<pre style="margin: 0;">+<span id="LC3641" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTyVar</span> <span class="n" style="color: #333;">v</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyCoVarsOfTypeDSet</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">substTyVar</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">v</span></span>
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3642
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<pre style="margin: 0;">+<span id="LC3642" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyCoVarsOfCoDSet</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">substCoVar</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">v</span></span>
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3643
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<pre style="margin: 0;">+<span id="LC3643" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="n" style="color: #333;">mapUnionDVarSet</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">dVarSetElems</span></span>
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3644
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<pre style="margin: 0;">+<span id="LC3644" class="line" lang="haskell"></span>
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3645
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<pre style="margin: 0;"> <span id="LC3645" class="line" lang="haskell"><span class="n" style="color: #333;">substForAllCoBndr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCoVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">KindCoercion</span></span>
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3400
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3646
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<pre style="margin: 0;"> <span id="LC3646" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TyCoVar</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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3647
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<pre style="margin: 0;"> <span id="LC3647" class="line" lang="haskell"><span class="n" style="color: #333;">substForAllCoBndr</span> <span class="n" style="color: #333;">subst</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">@@ -3475,14 +3721,15 @@ substForAllCoCoVarBndrUsing sym sco (TCvSubst in_scope tenv cenv)</td>
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3475
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3721
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<pre style="margin: 0;"> <span id="LC3721" class="line" lang="haskell"></span>
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3722
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<pre style="margin: 0;"> <span id="LC3722" class="line" lang="haskell"><span class="n" style="color: #333;">substCoVar</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span></span>
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3477
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3723
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<pre style="margin: 0;"> <span id="LC3723" class="line" lang="haskell"><span class="n" style="color: #333;">substCoVar</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">cenv</span><span class="p">)</span> <span class="n" style="color: #333;">cv</span></span>
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3478
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<pre style="margin: 0;">-<span id="LC3478" 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;">lookupVarEnv</span> <span class="n" style="color: #333;">cenv</span> <span class="n" style="color: #333;">cv</span> <span class="kr" style="font-weight: 600;">of</span></span>
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3724
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<pre style="margin: 0;">+<span id="LC3724" 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;">isCoVar</span> <span class="n" style="color: #333;">cv</span> <span class="p">)</span></span>
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3725
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<pre style="margin: 0;">+<span id="LC3725" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lookupVarEnv</span> <span class="n" style="color: #333;">cenv</span> <span class="n" style="color: #333;">cv</span> <span class="kr" style="font-weight: 600;">of</span></span>
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3479
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3726
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<pre style="margin: 0;"> <span id="LC3726" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">co</span></span>
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3480
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3727
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<pre style="margin: 0;"> <span id="LC3727" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoVarCo</span> <span class="n" style="color: #333;">cv</span></span>
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3481
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3728
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<pre style="margin: 0;"> <span id="LC3728" class="line" lang="haskell"></span>
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3482
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3729
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<pre style="margin: 0;"> <span id="LC3729" class="line" lang="haskell"><span class="n" style="color: #333;">substCoVars</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></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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3483
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3730
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<pre style="margin: 0;"> <span id="LC3730" class="line" lang="haskell"><span class="n" style="color: #333;">substCoVars</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">cvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">substCoVar</span> <span class="n" style="color: #333;">subst</span><span class="p">)</span> <span class="n" style="color: #333;">cvs</span></span>
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3484
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3731
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<pre style="margin: 0;"> <span id="LC3731" class="line" lang="haskell"></span>
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3485
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<td class="diff-line-num new_line old" data-linenumber="3732" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC3485" class="line" lang="haskell"><span class="n" style="color: #333;">lookupCoVar</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Var</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span></span>
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3732
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<pre style="margin: 0;">+<span id="LC3732" class="line" lang="haskell"><span class="n" style="color: #333;">lookupCoVar</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">CoVar</span></span><span class="idiff right"> </span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span></span>
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3486
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3733
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<pre style="margin: 0;"> <span id="LC3733" class="line" lang="haskell"><span class="n" style="color: #333;">lookupCoVar</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">cenv</span><span class="p">)</span> <span class="n" style="color: #333;">v</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lookupVarEnv</span> <span class="n" style="color: #333;">cenv</span> <span class="n" style="color: #333;">v</span></span>
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3487
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3734
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<pre style="margin: 0;"> <span id="LC3734" class="line" lang="haskell"></span>
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3488
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3735
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<pre style="margin: 0;"> <span id="LC3735" class="line" lang="haskell"><span class="n" style="color: #333;">substTyVarBndr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HasCallStack</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="4057" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -4057,9 +4304,7 @@ tidyCo env@(_, subst) co</td>
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4057
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4304
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<pre style="margin: 0;"> <span id="LC4304" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the case above duplicates a bit of work in tidying h and the kind</span></span>
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4058
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4305
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<pre style="margin: 0;"> <span id="LC4305" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- of tv. But the alternative is to use coercionKind, which seems worse.</span></span>
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4059
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4306
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<pre style="margin: 0;"> <span id="LC4306" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FunCo</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">co1</span> <span class="n" style="color: #333;">co2</span><span class="p">)</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;">r</span> <span class="o" style="font-weight: 600;">$!</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">co1</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$!</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">co2</span></span>
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4060
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<pre style="margin: 0;">-<span id="LC4060" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoVarCo</span> <span class="n" style="color: #333;">cv</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lookupVarEnv</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">cv</span> <span class="kr" style="font-weight: 600;">of</span></span>
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4061
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<pre style="margin: 0;">-<span id="LC4061" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoVarCo</span> <span class="n" style="color: #333;">cv</span></span>
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4062
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<pre style="margin: 0;">-<span id="LC4062" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">cv'</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoVarCo</span> <span class="n" style="color: #333;">cv'</span></span>
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4307
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<pre style="margin: 0;">+<span id="LC4307" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoVarCo</span> <span class="n" style="color: #333;">cv</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CoVarCo</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">substCoVar</span> <span class="n" style="color: #333;">cv</span></span>
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4063
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4308
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<pre style="margin: 0;"> <span id="LC4308" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HoleCo</span> <span class="n" style="color: #333;">h</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HoleCo</span> <span class="n" style="color: #333;">h</span></span>
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4064
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4309
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<pre style="margin: 0;"> <span id="LC4309" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AxiomInstCo</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">ind</span> <span class="n" style="color: #333;">cos</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">cos</span></span>
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4065
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4310
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<pre style="margin: 0;"> <span id="LC4310" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="n" style="color: #333;">args</span> <span class="p">`</span><span class="n" style="color: #333;">seqList</span><span class="p">`</span> <span class="kt" style="color: #458; font-weight: 600;">AxiomInstCo</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">ind</span> <span class="n" style="color: #333;">args</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="4079" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="4324" 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">@@ -4079,6 +4324,9 @@ tidyCo env@(_, subst) co</td>
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4079
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4324
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<pre style="margin: 0;"> <span id="LC4324" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PhantomProv</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PhantomProv</span> <span class="p">(</span><span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>
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4080
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<td class="diff-line-num new_line" data-linenumber="4325" 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">
4325
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<pre style="margin: 0;"> <span id="LC4325" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ProofIrrelProv</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ProofIrrelProv</span> <span class="p">(</span><span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>
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4081
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4326
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<pre style="margin: 0;"> <span id="LC4326" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="n" style="color: #333;">p</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PluginProv</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;">p</span></span>
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4327
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<pre style="margin: 0;">+<span id="LC4327" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ZappedProv</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ZappedProv</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mapUnionDVarSet</span> <span class="p">(</span><span class="n" style="color: #333;">unitDVarSet</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">substCoVar</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">dVarSetElems</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span></span>
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4328
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<pre style="margin: 0;">+<span id="LC4328" class="line" lang="haskell"></span>
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4329
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<pre style="margin: 0;">+<span id="LC4329" class="line" lang="haskell"> <span class="n" style="color: #333;">substCoVar</span> <span class="n" style="color: #333;">cv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fromMaybe</span> <span class="n" style="color: #333;">cv</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">lookupVarEnv</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">cv</span></span>
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4082
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4330
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<pre style="margin: 0;"> <span id="LC4330" class="line" lang="haskell"></span>
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4083
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4331
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<pre style="margin: 0;"> <span id="LC4331" class="line" lang="haskell"><span class="n" style="color: #333;">tidyCos</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TidyEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Coercion</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></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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4084
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4332
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<pre style="margin: 0;"> <span id="LC4332" class="line" lang="haskell"><span class="n" style="color: #333;">tidyCos</span> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">tidyCo</span> <span class="n" style="color: #333;">env</span><span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="4139" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="4387" 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">@@ -4139,3 +4387,4 @@ provSize UnsafeCoerceProv = 1</td>
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4139
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4387
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<pre style="margin: 0;"> <span id="LC4387" class="line" lang="haskell"><span class="n" style="color: #333;">provSize</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PhantomProv</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">+</span> <span class="n" style="color: #333;">coercionSize</span> <span class="n" style="color: #333;">co</span></span>
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4140
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4388
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<pre style="margin: 0;"> <span id="LC4388" class="line" lang="haskell"><span class="n" style="color: #333;">provSize</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ProofIrrelProv</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">+</span> <span class="n" style="color: #333;">coercionSize</span> <span class="n" style="color: #333;">co</span></span>
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4141
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4389
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<pre style="margin: 0;"> <span id="LC4389" class="line" lang="haskell"><span class="n" style="color: #333;">provSize</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PluginProv</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">1</span></span>
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4390
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<pre style="margin: 0;">+<span id="LC4390" class="line" lang="haskell"><span class="n" style="color: #333;">provSize</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ZappedProv</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">1</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/ea7f96de6f492a82564b0633152a895b9408c15f#07ce9a046fb8ea6659690020b0a8551d94cfdf1c"><strong>compiler/types/Type.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">@@ -267,7 +267,8 @@ import FV</td>
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267
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267
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<pre style="margin: 0;"> <span id="LC267" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Outputable</span></span>
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268
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<pre style="margin: 0;"> <span id="LC268" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">FastString</span></span>
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269
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269
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<pre style="margin: 0;"> <span id="LC269" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Pair</span></span>
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<pre style="margin: 0;">-<span id="LC270" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">DynFlags</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">gopt_set</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">GeneralFlag</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Opt_PrintExplicitRuntimeReps</span><span class="p">)</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC270" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">DynFlags</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">HasDynFlags</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC271" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">gopt_set</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">GeneralFlag</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Opt_PrintExplicitRuntimeReps</span><span class="p">)</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC272" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">ListSetOps</span></span>
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273
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<pre style="margin: 0;"> <span id="LC273" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Unique</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">nonDetCmpUnique</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC274" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -479,6 +480,8 @@ expandTypeSynonyms ty</td>
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480
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<pre style="margin: 0;"> <span id="LC480" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="n" style="color: #333;">subst</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PhantomProv</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PhantomProv</span> <span class="p">(</span><span class="n" style="color: #333;">go_co</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>
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481
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<pre style="margin: 0;"> <span id="LC481" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="n" style="color: #333;">subst</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ProofIrrelProv</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ProofIrrelProv</span> <span class="p">(</span><span class="n" style="color: #333;">go_co</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC482" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">p</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PluginProv</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;">p</span></span>
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483
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<pre style="margin: 0;">+<span id="LC483" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="n" style="color: #333;">subst</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ZappedProv</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC484" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ZappedProv</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">substFreeDVarSet</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">fvs</span></span>
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485
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<pre style="margin: 0;"> <span id="LC485" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC486" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the "False" and "const" are to accommodate the type of</span></span>
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<pre style="margin: 0;"> <span id="LC487" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- substForAllCoBndrUsing, which is general enough to</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">@@ -547,7 +550,8 @@ data TyCoMapper env m</td>
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<pre style="margin: 0;"> <span id="LC550" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC551" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC552" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINABLE mapType #-}</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Specialising mappers]</span></span>
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<pre style="margin: 0;">-<span id="LC550" class="line" lang="haskell"><span class="n" style="color: #333;">mapType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Monad</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">TyCoMapper</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span></span>
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<pre style="margin: 0;">+<span id="LC553" class="line" lang="haskell"><span class="n" style="color: #333;">mapType</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Monad</span> <span class="n" style="color: #333;">m</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">HasDynFlags</span> <span class="n" style="color: #333;">m</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC554" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">TyCoMapper</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span></span>
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555
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<pre style="margin: 0;"> <span id="LC555" class="line" lang="haskell"><span class="n" style="color: #333;">mapType</span> <span class="n" style="color: #333;">mapper</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyCoMapper</span> <span class="p">{</span> <span class="n" style="color: #333;">tcm_tyvar</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyvar</span></span>
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<pre style="margin: 0;"> <span id="LC556" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcm_tycobinder</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tycobinder</span></span>
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557
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<pre style="margin: 0;"> <span id="LC557" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcm_tycon</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tycon</span> <span class="p">})</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="586" 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">@@ -582,7 +586,7 @@ mapType mapper@(TyCoMapper { tcm_tyvar = tyvar</td>
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582
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586
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<pre style="margin: 0;"> <span id="LC586" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">ForAllTy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Bndr</span> <span class="n" style="color: #333;">tv'</span> <span class="n" style="color: #333;">vis</span><span class="p">)</span> <span class="n" style="color: #333;">inner'</span> <span class="p">}</span></span>
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587
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<pre style="margin: 0;"> <span id="LC587" class="line" lang="haskell"></span>
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588
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<pre style="margin: 0;"> <span id="LC588" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINABLE mapCoercion #-}</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Specialising mappers]</span></span>
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585
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<pre style="margin: 0;">-<span id="LC585" class="line" lang="haskell"><span class="n" style="color: #333;">mapCoercion</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Monad</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">m</span></span></span>
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<pre style="margin: 0;">+<span id="LC589" class="line" lang="haskell"><span class="n" style="color: #333;">mapCoercion</span> <span class="o" style="font-weight: 600;">::</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Monad</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">m</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">HasDynFlags</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">m</span></span><span class="p"><span class="idiff right">)</span></span></span>
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586
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<pre style="margin: 0;"> <span id="LC590" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">TyCoMapper</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span></span>
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591
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<pre style="margin: 0;"> <span id="LC591" class="line" lang="haskell"><span class="n" style="color: #333;">mapCoercion</span> <span class="n" style="color: #333;">mapper</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyCoMapper</span> <span class="p">{</span> <span class="n" style="color: #333;">tcm_covar</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">covar</span></span>
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592
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<pre style="margin: 0;"> <span id="LC592" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcm_hole</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cohole</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="629" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="633" 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">@@ -629,6 +633,11 @@ mapCoercion mapper@(TyCoMapper { tcm_covar = covar</td>
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629
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633
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<pre style="margin: 0;"> <span id="LC633" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PhantomProv</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PhantomProv</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">co</span></span>
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634
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<pre style="margin: 0;"> <span id="LC634" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ProofIrrelProv</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ProofIrrelProv</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">co</span></span>
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635
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<pre style="margin: 0;"> <span id="LC635" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="n" style="color: #333;">p</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PluginProv</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;">return</span> <span class="n" style="color: #333;">p</span></span>
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<pre style="margin: 0;">+<span id="LC636" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ZappedProv</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC637" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">bndrFVs</span> <span class="n" style="color: #333;">v</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC638" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span><span class="n" style="color: #333;">isCoVar</span> <span class="n" style="color: #333;">v</span><span class="p">)</span></span>
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639
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<pre style="margin: 0;">+<span id="LC639" class="line" lang="haskell"> <span class="n" style="color: #333;">tyCoVarsOfCoDSet</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">covar</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">v</span></span>
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640
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<pre style="margin: 0;">+<span id="LC640" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="kt" style="color: #458; font-weight: 600;">ZappedProv</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">unionDVarSets</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">bndrFVs</span> <span class="p">(</span><span class="n" style="color: #333;">dVarSetElems</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span></span>
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641
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<pre style="margin: 0;"> <span id="LC641" class="line" lang="haskell"></span>
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633
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642
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<pre style="margin: 0;"> <span id="LC642" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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643
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<pre style="margin: 0;"> <span id="LC643" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="3021" 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">@@ -3012,7 +3021,7 @@ occCheckExpand vs_to_avoid ty</td>
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3012
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3021
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<pre style="margin: 0;"> <span id="LC3021" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="n" style="color: #333;">cxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PhantomProv</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PhantomProv</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">go_co</span> <span class="n" style="color: #333;">cxt</span> <span class="n" style="color: #333;">co</span></span>
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3013
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3022
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<pre style="margin: 0;"> <span id="LC3022" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="n" style="color: #333;">cxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ProofIrrelProv</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ProofIrrelProv</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">go_co</span> <span class="n" style="color: #333;">cxt</span> <span class="n" style="color: #333;">co</span></span>
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3014
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3023
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<pre style="margin: 0;"> <span id="LC3023" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">p</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PluginProv</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;">return</span> <span class="n" style="color: #333;">p</span></span>
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3015
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<pre style="margin: 0;">-<span id="LC3015" class="line" lang="haskell"></span>
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3024
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<pre style="margin: 0;">+<span id="LC3024" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">p</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ZappedProv</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;">return</span> <span class="n" style="color: #333;">p</span></span>
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3016
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3025
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<pre style="margin: 0;"> <span id="LC3025" class="line" lang="haskell"></span>
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3017
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3026
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<pre style="margin: 0;"> <span id="LC3026" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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3018
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3027
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<pre style="margin: 0;"> <span id="LC3027" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">%************************************************************************</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -3068,6 +3077,10 @@ tyConsOfType ty</td>
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3068
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3077
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<pre style="margin: 0;"> <span id="LC3077" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PluginProv</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;">emptyUniqSet</span></span>
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3069
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3078
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<pre style="margin: 0;"> <span id="LC3078" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- this last case can happen from the tyConsOfType used from</span></span>
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3070
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3079
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<pre style="margin: 0;"> <span id="LC3079" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- checkTauTvUpdate</span></span>
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3080
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<pre style="margin: 0;">+<span id="LC3080" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ZappedProv</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;">emptyUniqSet</span></span>
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3081
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<pre style="margin: 0;">+<span id="LC3081" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- [ZappedCoDifference] that this will not report TyCons present in the</span></span>
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<pre style="margin: 0;">+<span id="LC3082" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- unzapped proof but not its kind. See Note [Zapping coercions] in</span></span>
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<pre style="margin: 0;">+<span id="LC3083" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- TyCoRep.</span></span>
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3084
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<pre style="margin: 0;"> <span id="LC3084" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3085" class="line" lang="haskell"> <span class="n" style="color: #333;">go_s</span> <span class="n" style="color: #333;">tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="p">(</span><span class="n" style="color: #333;">unionUniqSets</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">go</span><span class="p">)</span> <span class="n" style="color: #333;">emptyUniqSet</span> <span class="n" style="color: #333;">tys</span></span>
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3073
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<pre style="margin: 0;"> <span id="LC3086" class="line" lang="haskell"> <span class="n" style="color: #333;">go_cos</span> <span class="n" style="color: #333;">cos</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="p">(</span><span class="n" style="color: #333;">unionUniqSets</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">go_co</span><span class="p">)</span> <span class="n" style="color: #333;">emptyUniqSet</span> <span class="n" style="color: #333;">cos</span></span>
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