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<h3>
Simon Peyton Jones pushed to branch wip/T18223
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/716b67d9b0ce485e2bfb6951b5f0586af642cad8">716b67d9</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-08-20T17:29:09+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Work in progress on #18223
There are two main changes in here
1. Stop Specialise specalising DFuns. This cases a huge
(and utterly unnecessary) blowup in program size in #18223.
I also refactored the Specialise monad a bit... it was silly.
2. Re-engineer eta-expansion (again). The eta-expander was
generating lots of intermediate stuff, which could be optimised
away, but which choked the simplifier meanwhile. Relatively
easy to kill it off at source.
Needs some Notes etc, and perhaps two separate patches, but I want
to get this into CI and perf testing.
</pre>
</li>
</ul>
<h4>8 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#783e5dae6e86931f06700fc088fb7d48c8a07386">
compiler/GHC/Core/Coercion.hs
</a>
</li>
<li class="file-stats">
<a href="#c3967bb9d3e8f5aae2dd111b5a335b48c21c1999">
compiler/GHC/Core/Opt/Arity.hs
</a>
</li>
<li class="file-stats">
<a href="#f168a93cde5e2aec2441d6331dfe500172df4af3">
compiler/GHC/Core/Opt/Simplify.hs
</a>
</li>
<li class="file-stats">
<a href="#2f46b19cb85e3f7b4e72305644bc50015628c41d">
compiler/GHC/Core/Opt/Simplify/Env.hs
</a>
</li>
<li class="file-stats">
<a href="#ab22d7ae4d245581b701367e386d7e886e416e76">
compiler/GHC/Core/Opt/Specialise.hs
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<li class="file-stats">
<a href="#a8e2a1e5829eb3b4809201e0f47e91b64ce11b96">
compiler/GHC/Core/Ppr.hs
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<li class="file-stats">
<a href="#11ffe98a94d798427bc600e4fcfe899407536346">
compiler/GHC/Core/SimpleOpt.hs
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<li class="file-stats">
<a href="#708fab0a51bd47227233eda4698e750ff6de66e0">
compiler/GHC/Core/Subst.hs
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<h4>Changes:</h4>
<li id="783e5dae6e86931f06700fc088fb7d48c8a07386">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/716b67d9b0ce485e2bfb6951b5f0586af642cad8#783e5dae6e86931f06700fc088fb7d48c8a07386"><strong>compiler/GHC/Core/Coercion.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_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">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -31,7 +31,7 @@ module GHC.Core.Coercion (</td>
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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">
31
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkAxInstRHS</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkUnbranchedAxInstRHS</span><span class="p">,</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="32" 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">
32
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkAxInstLHS</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkUnbranchedAxInstLHS</span><span class="p">,</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="33" 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">
33
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<td class="diff-line-num new_line" data-linenumber="33" 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">
33
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkPiCo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkPiCos</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkCoCast</span><span class="p">,</span></span>
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<td class="diff-line-num old old_line" data-linenumber="34" 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">
34
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<td class="diff-line-num new_line old" data-linenumber="34" 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="LC34" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkSymCo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkTransCo</span><span class="p">,</span><span class="idiff left"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">mkTransMCo</span></span><span class="p"><span class="idiff right">,</span></span></span>
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<td class="diff-line-num new old_line" data-linenumber="35" 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="34" 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="LC34" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkSymCo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkTransCo</span><span class="p">,</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="35" 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">
35
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkNthCo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">nthCoRole</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkLRCo</span><span class="p">,</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="36" 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">
36
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkInstCo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkAppCo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkAppCos</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkTyConAppCo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkFunCo</span><span class="p">,</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="37" 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">
37
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37
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkForAllCo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkForAllCos</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkHomoForAllCos</span><span class="p">,</span></span>
</pre>
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<td class="diff-line-num unfold js-unfold old_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="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">@@ -65,7 +65,8 @@ module GHC.Core.Coercion (</td>
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<pre style="margin: 0;"> <span id="LC65" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">pickLR</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC66" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC67" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isGReflCo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isReflCo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isReflCo_maybe</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isGReflCo_maybe</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isReflexiveCo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isReflexiveCo_maybe</span><span class="p">,</span></span>
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<td class="diff-line-num old old_line" data-linenumber="68" 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="LC68" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isReflCoVar_maybe</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isGReflMCo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">coToMCo</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC68" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isReflCoVar_maybe</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isGReflMCo</span><span class="p">,</span></span>
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<td class="diff-line-num new new_line" data-linenumber="69" 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="LC69" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">coToMCo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkTransMCo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkTransMCoL</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC70" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ** Coercion variables</span></span>
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<pre style="margin: 0;"> <span id="LC72" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkCoVar</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isCoVar</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">coVarName</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">setCoVarName</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">setCoVarUnique</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">@@ -288,6 +289,44 @@ tidyCoAxBndrsForUser init_env tcvs</td>
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<pre style="margin: 0;"> <span id="LC289" class="line" lang="haskell"> <span class="p">(</span><span class="sc" style="color: #d14;">'_'</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">rest</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">all</span> <span class="n" style="color: #333;">isDigit</span> <span class="n" style="color: #333;">rest</span></span>
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<pre style="margin: 0;"> <span id="LC290" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;"> <span id="LC291" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC292" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC293" 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="LC294" 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="LC295" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MCoercion</span></span>
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<pre style="margin: 0;">+<span id="LC296" 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="LC297" 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="LC298" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC299" class="line" lang="haskell"><span class="n" style="color: #333;">coToMCo</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;">MCoercion</span></span>
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<pre style="margin: 0;">+<span id="LC300" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Convert a coercion to a MCoercion,</span></span>
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<pre style="margin: 0;">+<span id="LC301" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- checking aggressively for reflexivity</span></span>
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<pre style="margin: 0;">+<span id="LC302" class="line" lang="haskell"><span class="n" style="color: #333;">coToMCo</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isReflexiveCo</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;">MRefl</span></span>
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<pre style="margin: 0;">+<span id="LC303" 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;">MCo</span> <span class="n" style="color: #333;">co</span></span>
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<pre style="margin: 0;">+<span id="LC304" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC305" class="line" lang="haskell"><span class="cd">-- | Tests if this MCoercion is obviously generalized reflexive</span></span>
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<pre style="margin: 0;">+<span id="LC306" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Guaranteed to work very quickly.</span></span>
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<pre style="margin: 0;">+<span id="LC307" class="line" lang="haskell"><span class="n" style="color: #333;">isGReflMCo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">MCoercion</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC308" class="line" lang="haskell"><span class="n" style="color: #333;">isGReflMCo</span> <span class="kt" style="color: #458; font-weight: 600;">MRefl</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">+<span id="LC309" class="line" lang="haskell"><span class="n" style="color: #333;">isGReflMCo</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;">isGReflCo</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;">True</span></span>
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<pre style="margin: 0;">+<span id="LC310" class="line" lang="haskell"><span class="n" style="color: #333;">isGReflMCo</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>
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<pre style="margin: 0;">+<span id="LC311" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC312" class="line" lang="haskell"><span class="cd">-- | Make a generalized reflexive coercion</span></span>
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<pre style="margin: 0;">+<span id="LC313" class="line" lang="haskell"><span class="n" style="color: #333;">mkGReflCo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Role</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;">MCoercionN</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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<pre style="margin: 0;">+<span id="LC314" class="line" lang="haskell"><span class="n" style="color: #333;">mkGReflCo</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">mco</span></span>
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<pre style="margin: 0;">+<span id="LC315" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isGReflMCo</span> <span class="n" style="color: #333;">mco</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="kr" style="font-weight: 600;">then</span> <span class="kt" style="color: #458; font-weight: 600;">Refl</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC316" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="kt" style="color: #458; font-weight: 600;">GRefl</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">ty</span> <span class="kt" style="color: #458; font-weight: 600;">MRefl</span></span>
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<pre style="margin: 0;">+<span id="LC317" 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;">GRefl</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">mco</span></span>
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<pre style="margin: 0;">+<span id="LC318" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC319" class="line" lang="haskell"><span class="cd">-- | Compose two MCoercions via transitivity</span></span>
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<pre style="margin: 0;">+<span id="LC320" class="line" lang="haskell"><span class="n" style="color: #333;">mkTransMCo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">MCoercion</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MCoercion</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MCoercion</span></span>
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<pre style="margin: 0;">+<span id="LC321" class="line" lang="haskell"><span class="n" style="color: #333;">mkTransMCo</span> <span class="kt" style="color: #458; font-weight: 600;">MRefl</span> <span class="n" style="color: #333;">co2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">co2</span></span>
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<pre style="margin: 0;">+<span id="LC322" class="line" lang="haskell"><span class="n" style="color: #333;">mkTransMCo</span> <span class="n" style="color: #333;">co1</span> <span class="kt" style="color: #458; font-weight: 600;">MRefl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">co1</span></span>
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<pre style="margin: 0;">+<span id="LC323" class="line" lang="haskell"><span class="n" style="color: #333;">mkTransMCo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MCo</span> <span class="n" style="color: #333;">co1</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MCo</span> <span class="n" style="color: #333;">co2</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="p">(</span><span class="n" style="color: #333;">mkTransCo</span> <span class="n" style="color: #333;">co1</span> <span class="n" style="color: #333;">co2</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC324" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC325" class="line" lang="haskell"><span class="n" style="color: #333;">mkTransMCoL</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">MCoercion</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;">MCoercion</span></span>
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<pre style="margin: 0;">+<span id="LC326" class="line" lang="haskell"><span class="n" style="color: #333;">mkTransMCoL</span> <span class="kt" style="color: #458; font-weight: 600;">MRefl</span> <span class="n" style="color: #333;">co2</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MCo</span> <span class="n" style="color: #333;">co2</span></span>
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<pre style="margin: 0;">+<span id="LC327" class="line" lang="haskell"><span class="n" style="color: #333;">mkTransMCoL</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MCo</span> <span class="n" style="color: #333;">co1</span><span class="p">)</span> <span class="n" style="color: #333;">co2</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MCo</span> <span class="p">(</span><span class="n" style="color: #333;">mkTransCo</span> <span class="n" style="color: #333;">co1</span> <span class="n" style="color: #333;">co2</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC328" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC330" 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="LC331" 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="LC332" 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">@@ -556,13 +595,6 @@ isGReflCo (GRefl{}) = True</td>
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<pre style="margin: 0;"> <span id="LC595" class="line" lang="haskell"><span class="n" style="color: #333;">isGReflCo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Refl</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 class="c1" style="color: #998; font-style: italic;">-- Refl ty == GRefl N ty MRefl</span></span>
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<pre style="margin: 0;"> <span id="LC596" class="line" lang="haskell"><span class="n" style="color: #333;">isGReflCo</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>
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<pre style="margin: 0;"> <span id="LC597" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC559" class="line" lang="haskell"><span class="cd">-- | Tests if this MCoercion is obviously generalized reflexive</span></span>
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<pre style="margin: 0;">-<span id="LC560" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Guaranteed to work very quickly.</span></span>
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<pre style="margin: 0;">-<span id="LC561" class="line" lang="haskell"><span class="n" style="color: #333;">isGReflMCo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">MCoercion</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">-<span id="LC562" class="line" lang="haskell"><span class="n" style="color: #333;">isGReflMCo</span> <span class="kt" style="color: #458; font-weight: 600;">MRefl</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">-<span id="LC563" class="line" lang="haskell"><span class="n" style="color: #333;">isGReflMCo</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;">isGReflCo</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;">True</span></span>
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<pre style="margin: 0;">-<span id="LC564" class="line" lang="haskell"><span class="n" style="color: #333;">isGReflMCo</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>
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<pre style="margin: 0;">-<span id="LC565" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC598" class="line" lang="haskell"><span class="cd">-- | Tests if this coercion is obviously reflexive. Guaranteed to work</span></span>
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<pre style="margin: 0;"> <span id="LC599" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- very quickly. Sometimes a coercion can be reflexive, but not obviously</span></span>
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<pre style="margin: 0;"> <span id="LC600" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- so. c.f. 'isReflexiveCo'</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">@@ -603,10 +635,6 @@ isReflexiveCo_maybe co</td>
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<pre style="margin: 0;"> <span id="LC635" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<pre style="margin: 0;"> <span id="LC636" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</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;">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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<pre style="margin: 0;"> <span id="LC637" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC606" class="line" lang="haskell"><span class="n" style="color: #333;">coToMCo</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;">MCoercion</span></span>
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<pre style="margin: 0;">-<span id="LC607" class="line" lang="haskell"><span class="n" style="color: #333;">coToMCo</span> <span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">isReflCo</span> <span class="n" style="color: #333;">c</span></span>
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<pre style="margin: 0;">-<span id="LC608" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="kt" style="color: #458; font-weight: 600;">MRefl</span></span>
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<pre style="margin: 0;">-<span id="LC609" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="kt" style="color: #458; font-weight: 600;">MCo</span> <span class="n" style="color: #333;">c</span></span>
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<pre style="margin: 0;"> <span id="LC638" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC639" 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="LC640" 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">@@ -669,13 +697,6 @@ role is bizarre and a caller should have to ask for this behavior explicitly.</td>
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<pre style="margin: 0;"> <span id="LC697" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC698" 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="LC699" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC672" class="line" lang="haskell"><span class="cd">-- | Make a generalized reflexive coercion</span></span>
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<pre style="margin: 0;">-<span id="LC673" class="line" lang="haskell"><span class="n" style="color: #333;">mkGReflCo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Role</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;">MCoercionN</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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<pre style="margin: 0;">-<span id="LC674" class="line" lang="haskell"><span class="n" style="color: #333;">mkGReflCo</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">mco</span></span>
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<pre style="margin: 0;">-<span id="LC675" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isGReflMCo</span> <span class="n" style="color: #333;">mco</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="kr" style="font-weight: 600;">then</span> <span class="kt" style="color: #458; font-weight: 600;">Refl</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">-<span id="LC676" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="kt" style="color: #458; font-weight: 600;">GRefl</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">ty</span> <span class="kt" style="color: #458; font-weight: 600;">MRefl</span></span>
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<pre style="margin: 0;">-<span id="LC677" 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;">GRefl</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">mco</span></span>
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<pre style="margin: 0;">-<span id="LC678" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC700" class="line" lang="haskell"><span class="cd">-- | Make a reflexive coercion</span></span>
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<pre style="margin: 0;"> <span id="LC701" class="line" lang="haskell"><span class="n" style="color: #333;">mkReflCo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Role</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;">Coercion</span></span>
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702
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<pre style="margin: 0;"> <span id="LC702" class="line" lang="haskell"><span class="n" style="color: #333;">mkReflCo</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Refl</span> <span class="n" style="color: #333;">ty</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1011" 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">@@ -990,12 +1011,6 @@ mkTransCo (GRefl r t1 (MCo co1)) (GRefl _ _ (MCo co2))</td>
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990
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1011
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<pre style="margin: 0;"> <span id="LC1011" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">GRefl</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">t1</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MCo</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkTransCo</span> <span class="n" style="color: #333;">co1</span> <span class="n" style="color: #333;">co2</span><span class="p">)</span></span>
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1012
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<pre style="margin: 0;"> <span id="LC1012" class="line" lang="haskell"><span class="n" style="color: #333;">mkTransCo</span> <span class="n" style="color: #333;">co1</span> <span class="n" style="color: #333;">co2</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TransCo</span> <span class="n" style="color: #333;">co1</span> <span class="n" style="color: #333;">co2</span></span>
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<pre style="margin: 0;"> <span id="LC1013" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC993" class="line" lang="haskell"><span class="cd">-- | Compose two MCoercions via transitivity</span></span>
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<pre style="margin: 0;">-<span id="LC994" class="line" lang="haskell"><span class="n" style="color: #333;">mkTransMCo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">MCoercion</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MCoercion</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MCoercion</span></span>
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<pre style="margin: 0;">-<span id="LC995" class="line" lang="haskell"><span class="n" style="color: #333;">mkTransMCo</span> <span class="kt" style="color: #458; font-weight: 600;">MRefl</span> <span class="n" style="color: #333;">co2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">co2</span></span>
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<pre style="margin: 0;">-<span id="LC996" class="line" lang="haskell"><span class="n" style="color: #333;">mkTransMCo</span> <span class="n" style="color: #333;">co1</span> <span class="kt" style="color: #458; font-weight: 600;">MRefl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">co1</span></span>
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<pre style="margin: 0;">-<span id="LC997" class="line" lang="haskell"><span class="n" style="color: #333;">mkTransMCo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MCo</span> <span class="n" style="color: #333;">co1</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MCo</span> <span class="n" style="color: #333;">co2</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="p">(</span><span class="n" style="color: #333;">mkTransCo</span> <span class="n" style="color: #333;">co1</span> <span class="n" style="color: #333;">co2</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC998" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1014" class="line" lang="haskell"><span class="n" style="color: #333;">mkNthCo</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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<pre style="margin: 0;"> <span id="LC1015" 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 you're creating</span></span>
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<pre style="margin: 0;"> <span id="LC1016" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="c1" style="color: #998; font-style: italic;">-- Zero-indexed</span></span>
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<li id="c3967bb9d3e8f5aae2dd111b5a335b48c21c1999">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/716b67d9b0ce485e2bfb6951b5f0586af642cad8#c3967bb9d3e8f5aae2dd111b5a335b48c21c1999"><strong>compiler/GHC/Core/Opt/Arity.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">@@ -15,10 +15,18 @@ module GHC.Core.Opt.Arity</td>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">manifestArity</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">joinRhsArity</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">exprArity</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">typeArity</span></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">exprEtaExpandArity</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">findRhsArity</span></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">etaExpand</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">etaExpandAT</span></span>
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<pre style="margin: 0;">-<span id="LC18" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">etaExpandToJoinPoint</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">etaExpandToJoinPointRule</span></span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">exprBotStrictness_maybe</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ** ArityType</span></span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</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;">expandableArityType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">arityTypeArity</span></span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">maxWithArity</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isBotArityType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">idArityType</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ** Join points</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">etaExpandToJoinPoint</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">etaExpandToJoinPointRule</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;">-- ** Coercions and casts</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pushCoArg</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pushCoArgs</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pushCoValArg</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pushCoTyArg</span></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pushCoercionIntoLambda</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pushCoDataCon</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">collectBindersPushingCo</span></span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC32" 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">@@ -31,15 +39,21 @@ import GHC.Driver.Ppr</td>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core</span></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.FVs</span></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Utils</span></span>
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<pre style="margin: 0;">-<span id="LC34" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Subst</span></span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Demand</span></span>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var</span></span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var.Env</span></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Id</span></span>
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<pre style="margin: 0;">-<span id="LC39" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Type</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">Type</span></span>
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<pre style="margin: 0;">-<span id="LC40" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCon</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">initRecTc</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkRecTc</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC46" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC47" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We have two sorts of substitution:</span></span>
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- GHC.Core.Subst.Subst, and GHC.Core.TyCo.TCvSubst</span></span>
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<pre style="margin: 0;">+<span id="LC49" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Both have substTy, substCo Hence need for qualification</span></span>
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<pre style="margin: 0;">+<span id="LC50" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Subst</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">Core</span></span>
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<pre style="margin: 0;">+<span id="LC51" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Type</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">Type</span></span>
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<pre style="margin: 0;">+<span id="LC52" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Coercion</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">Type</span></span>
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<pre style="margin: 0;">+<span id="LC53" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC54" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.DataCon</span></span>
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55
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<pre style="margin: 0;">+<span id="LC55" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCon</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">initRecTc</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkRecTc</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tyConArity</span> <span class="p">)</span></span>
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41
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Predicate</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">isDictTy</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="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Coercion</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">Coercion</span></span>
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43
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<pre style="margin: 0;"> <span id="LC57" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Multiplicity</span></span>
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44
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58
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<pre style="margin: 0;"> <span id="LC58" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var.Set</span></span>
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45
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<pre style="margin: 0;"> <span id="LC59" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Basic</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">@@ -48,7 +62,8 @@ import GHC.Driver.Session ( DynFlags, GeneralFlag(..), gopt )</td>
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<pre style="margin: 0;"> <span id="LC62" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Outputable</span></span>
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<pre style="margin: 0;"> <span id="LC63" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Panic</span></span>
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<pre style="margin: 0;"> <span id="LC64" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.FastString</span></span>
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51
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<pre style="margin: 0;">-<span id="LC51" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Misc</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">lengthAtLeast</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC65" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.Pair</span></span>
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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;">GHC.Utils.Misc</span></span>
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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="cm" style="color: #998; font-style: italic;">{-</span></span>
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<pre style="margin: 0;"> <span id="LC69" 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 old_line" data-linenumber="1076" 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="1091" 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">@@ -1076,12 +1091,11 @@ eta_expand one_shots orig_expr</td>
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1076
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<pre style="margin: 0;"> <span id="LC1091" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">oss</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Cast</span> <span class="n" style="color: #333;">expr</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;">Cast</span> <span class="p">(</span><span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">oss</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span> <span class="n" style="color: #333;">co</span></span>
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1077
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<pre style="margin: 0;"> <span id="LC1092" class="line" lang="haskell"></span>
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1078
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<pre style="margin: 0;"> <span id="LC1093" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">oss</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;">-<span id="LC1079" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- pprTrace "ee" (vcat [ppr orig_expr, ppr expr, ppr etas]) $</span></span>
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1080
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<pre style="margin: 0;">-<span id="LC1080" class="line" lang="haskell"> <span class="n" style="color: #333;">retick</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">etaInfoAbs</span> <span class="n" style="color: #333;">etas</span> <span class="p">(</span><span class="n" style="color: #333;">etaInfoApp</span> <span class="n" style="color: #333;"><span class="idiff left right">subst</span>'</span> <span class="n" style="color: #333;">sexpr</span> <span class="n" style="color: #333;">etas</span><span class="p">)</span></span>
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1094
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<pre style="margin: 0;">+<span id="LC1094" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- pprTrace "ee" (vcat [ppr orig_expr, ppr expr, ppr<span class="idiff left right">EtaInfos</span> etas]) $</span></span>
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1095
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<pre style="margin: 0;">+<span id="LC1095" class="line" lang="haskell"> <span class="n" style="color: #333;">retick</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">etaInfoAbs</span> <span class="n" style="color: #333;">etas</span> <span class="p">(</span><span class="n" style="color: #333;">etaInfoApp</span> <span class="n" style="color: #333;"><span class="idiff left right">in_scope</span>'</span> <span class="n" style="color: #333;">sexpr</span> <span class="n" style="color: #333;">etas</span><span class="p">)</span></span>
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1081
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1096
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<pre style="margin: 0;"> <span id="LC1096" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1082
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1097
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<pre style="margin: 0;"> <span id="LC1097" class="line" lang="haskell"> <span class="n" style="color: #333;">in_scope</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkInScopeSet</span> <span class="p">(</span><span class="n" style="color: #333;">exprFreeVars</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span></span>
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1083
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1098
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<pre style="margin: 0;"> <span id="LC1098" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">in_scope'</span><span class="p">,</span> <span class="n" style="color: #333;">etas</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkEtaWW</span> <span class="n" style="color: #333;">oss</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">orig_expr</span><span class="p">)</span> <span class="n" style="color: #333;">in_scope</span> <span class="p">(</span><span class="n" style="color: #333;">exprType</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span></span>
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1084
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<pre style="margin: 0;">-<span id="LC1084" class="line" lang="haskell"> <span class="n" style="color: #333;">subst'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkEmptySubst</span> <span class="n" style="color: #333;">in_scope'</span></span>
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1085
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1099
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<pre style="margin: 0;"> <span id="LC1099" class="line" lang="haskell"></span>
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1100
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<pre style="margin: 0;"> <span id="LC1100" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Find ticks behind type apps.</span></span>
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1087
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1101
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<pre style="margin: 0;"> <span id="LC1101" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Eta expansion and source notes]</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">@@ -1090,76 +1104,190 @@ eta_expand one_shots orig_expr</td>
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1104
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<pre style="margin: 0;"> <span id="LC1104" class="line" lang="haskell"> <span class="n" style="color: #333;">sexpr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldl'</span> <span class="kt" style="color: #458; font-weight: 600;">App</span> <span class="n" style="color: #333;">expr''</span> <span class="n" style="color: #333;">args</span></span>
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1091
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1105
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<pre style="margin: 0;"> <span id="LC1105" class="line" lang="haskell"> <span class="n" style="color: #333;">retick</span> <span class="n" style="color: #333;">expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="n" style="color: #333;">mkTick</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">ticks</span></span>
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1092
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1106
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<pre style="margin: 0;"> <span id="LC1106" class="line" lang="haskell"></span>
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1093
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<pre style="margin: 0;">-<span id="LC1093" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Abstraction Application</span></span>
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1107
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<pre style="margin: 0;">+<span id="LC1107" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *********************************************************************</span></span>
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1108
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<pre style="margin: 0;">+<span id="LC1108" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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1109
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<pre style="margin: 0;">+<span id="LC1109" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The EtaInfo mechanism</span></span>
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1110
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<pre style="margin: 0;">+<span id="LC1110" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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1111
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<pre style="margin: 0;">+<span id="LC1111" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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1112
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<pre style="margin: 0;">+<span id="LC1112" class="line" lang="haskell"></span>
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1113
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<pre style="margin: 0;">+<span id="LC1113" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [The EtaInfo mechanism]</span></span>
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1114
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<pre style="margin: 0;">+<span id="LC1114" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1115
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<pre style="margin: 0;">+<span id="LC1115" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Suppose we have (e :: ty) and we want to eta-expand it to arity N.</span></span>
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1116
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<pre style="margin: 0;">+<span id="LC1116" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This what eta_expand does. We do it in two steps:</span></span>
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1117
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<pre style="margin: 0;">+<span id="LC1117" class="line" lang="haskell"></span>
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1118
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<pre style="margin: 0;">+<span id="LC1118" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1. From 'ty' and 'N' build a [EtaInfo] which describes the shape</span></span>
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1119
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<pre style="margin: 0;">+<span id="LC1119" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> of the expansion.</span></span>
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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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1121
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<pre style="margin: 0;">+<span id="LC1121" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">2. Build the term</span></span>
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1122
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<pre style="margin: 0;">+<span id="LC1122" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> \ v1..vn. e v1 .. vn</span></span>
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1123
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<pre style="margin: 0;">+<span id="LC1123" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> where those abstractions and applications are described by</span></span>
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1124
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<pre style="margin: 0;">+<span id="LC1124" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the same [EtaInfo]. Specifically we build the term</span></span>
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1125
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<pre style="margin: 0;">+<span id="LC1125" class="line" lang="haskell"></span>
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1126
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<pre style="margin: 0;">+<span id="LC1126" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> etaInfoAbs etas (etaInfoApp in_scope e etas)</span></span>
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1127
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<pre style="margin: 0;">+<span id="LC1127" class="line" lang="haskell"></span>
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1128
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<pre style="margin: 0;">+<span id="LC1128" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> where etas :: [EtaInfo]#</span></span>
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1129
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<pre style="margin: 0;">+<span id="LC1129" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> etaInfoAbs builds the lambdas</span></span>
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1130
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<pre style="margin: 0;">+<span id="LC1130" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> etaInfoApp builds the applictions</span></span>
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1131
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<pre style="margin: 0;">+<span id="LC1131" class="line" lang="haskell"></span>
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1132
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<pre style="margin: 0;">+<span id="LC1132" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Note that the /same/ [EtaInfo] drives both etaInfoAbs and etaInfoApp</span></span>
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1133
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<pre style="margin: 0;">+<span id="LC1133" class="line" lang="haskell"></span>
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1134
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<pre style="margin: 0;">+<span id="LC1134" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">To a first approximation [EtaInfo] is just [Var]. But</span></span>
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1135
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<pre style="margin: 0;">+<span id="LC1135" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">casts complicate the question. If we have</span></span>
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1136
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<pre style="margin: 0;">+<span id="LC1136" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> newtype N a = MkN (S -> a)</span></span>
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1137
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<pre style="margin: 0;">+<span id="LC1137" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and</span></span>
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1138
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<pre style="margin: 0;">+<span id="LC1138" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ty = N (N Int)</span></span>
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1139
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<pre style="margin: 0;">+<span id="LC1139" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">then the eta-expansion must look like</span></span>
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1140
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<pre style="margin: 0;">+<span id="LC1140" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (\x (\y. ((e |> co1) x) |> co2) y)</span></span>
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1141
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<pre style="margin: 0;">+<span id="LC1141" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> |> sym co2)</span></span>
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1142
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<pre style="margin: 0;">+<span id="LC1142" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> |> sym co1</span></span>
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1143
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<pre style="margin: 0;">+<span id="LC1143" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">where</span></span>
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1144
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<pre style="margin: 0;">+<span id="LC1144" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> co1 :: N (N Int) ~ S -> N Int</span></span>
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1145
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<pre style="margin: 0;">+<span id="LC1145" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> co2 :: N Int ~ S -> Int</span></span>
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1146
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<pre style="margin: 0;">+<span id="LC1146" class="line" lang="haskell"></span>
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1147
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<pre style="margin: 0;">+<span id="LC1147" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Blimey! Look at all those casts. Moreover, if the type</span></span>
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1148
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<pre style="margin: 0;">+<span id="LC1148" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is very deeply nested (as happens in #18223), the repetition</span></span>
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1149
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<pre style="margin: 0;">+<span id="LC1149" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of types can make the overall term very large. So there is a big</span></span>
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1150
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<pre style="margin: 0;">+<span id="LC1150" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">payoff in cancelling out casts aggressively wherever possible.</span></span>
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1151
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<pre style="margin: 0;">+<span id="LC1151" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(See also Note [No crap in eta-expanded code].)</span></span>
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1152
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<pre style="margin: 0;">+<span id="LC1152" class="line" lang="haskell"></span>
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1153
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<pre style="margin: 0;">+<span id="LC1153" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This matters a lot in etaEInfoApp, where we</span></span>
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1154
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<pre style="margin: 0;">+<span id="LC1154" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Do beta-reduction on the fly</span></span>
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1155
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<pre style="margin: 0;">+<span id="LC1155" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Use getARg_mabye to get a cast out of the way,</span></span>
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1156
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<pre style="margin: 0;">+<span id="LC1156" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> so that we can do beta reduction</span></span>
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1157
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<pre style="margin: 0;">+<span id="LC1157" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Together this makes a big difference. Consider when e is</span></span>
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1158
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<pre style="margin: 0;">+<span id="LC1158" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> case x of</span></span>
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1159
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<pre style="margin: 0;">+<span id="LC1159" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> True -> (\x -> e1) |> c1</span></span>
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1160
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<pre style="margin: 0;">+<span id="LC1160" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> False -> (\p -> e2) |> c2</span></span>
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1161
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<pre style="margin: 0;">+<span id="LC1161" class="line" lang="haskell"></span>
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1162
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<pre style="margin: 0;">+<span id="LC1162" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">When we eta-expand this to arity 1, say, etaInfoAbs will wrap</span></span>
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1163
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<pre style="margin: 0;">+<span id="LC1163" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">a (\eta) around the outside and use etaInfoApp to apply each</span></span>
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1164
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<pre style="margin: 0;">+<span id="LC1164" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">alternative to 'eta'. We want to beta-reduce all that junk</span></span>
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1165
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<pre style="margin: 0;">+<span id="LC1165" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">away.</span></span>
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1166
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<pre style="margin: 0;">+<span id="LC1166" class="line" lang="haskell"></span>
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1167
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<pre style="margin: 0;">+<span id="LC1167" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">#18223 was a dramtic example in which the intermediate term was</span></span>
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1168
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<pre style="margin: 0;">+<span id="LC1168" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">grotesquely huge, even though the next Simplifier iteration squashed</span></span>
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1169
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<pre style="margin: 0;">+<span id="LC1169" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">it. Better to kill it at birth.</span></span>
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1170
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<pre style="margin: 0;">+<span id="LC1170" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1171
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<pre style="margin: 0;">+<span id="LC1171" class="line" lang="haskell"></span>
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1094
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1172
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<pre style="margin: 0;"> <span id="LC1172" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">--------------</span></span>
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1095
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<pre style="margin: 0;">-<span id="LC1095" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">EtaInfo</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">EtaVar</span> <span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="c1" style="color: #998; font-style: italic;">-- /\a. [] [] a</span></span>
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1096
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<pre style="margin: 0;">-<span id="LC1096" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- \x. [] [] x</span></span>
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1097
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<pre style="margin: 0;">-<span id="LC1097" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">EtaCo</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="c1" style="color: #998; font-style: italic;">-- [] |> sym co [] |> co</span></span>
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1173
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<pre style="margin: 0;">+<span id="LC1173" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">data EtaInfo -- Abstraction Application</span></span>
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1174
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<pre style="margin: 0;">+<span id="LC1174" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = EtaVar Var -- /\a. [] [] a</span></span>
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1175
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<pre style="margin: 0;">+<span id="LC1175" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- (\x. []) [] x</span></span>
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1176
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<pre style="margin: 0;">+<span id="LC1176" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | EtaCo CoercionR -- [] |> sym co [] |> co</span></span>
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1098
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1177
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<pre style="margin: 0;"> <span id="LC1177" class="line" lang="haskell"></span>
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1099
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1178
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<pre style="margin: 0;"> <span id="LC1178" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">instance Outputable EtaInfo where</span></span>
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1100
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<pre style="margin: 0;">-<span id="LC1100" 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;">EtaVar</span> <span class="n" style="color: #333;">v</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;">"EtaVar"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">v</span></span>
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1101
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<pre style="margin: 0;">-<span id="LC1101" 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;">EtaCo</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;">text</span> <span class="s" style="color: #d14;">"EtaCo"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">co</span></span>
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1179
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<pre style="margin: 0;">+<span id="LC1179" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ppr (EtaVar v) = text "EtaVar" <+> ppr v <+> dcolon <+> ppr (idType v)</span></span>
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1180
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<pre style="margin: 0;">+<span id="LC1180" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ppr (EtaCo co) = text "EtaCo" <+> hang (ppr co) 2 (dcolon <+> ppr (coercionType co))</span></span>
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1181
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<pre style="margin: 0;">+<span id="LC1181" class="line" lang="haskell"></span>
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1182
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<pre style="margin: 0;">+<span id="LC1182" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- Used in debug-printing</span></span>
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1183
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<pre style="margin: 0;">+<span id="LC1183" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- pprEtaInfos :: [EtaInfo] -> SDoc</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1184" 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">
1184
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<pre style="margin: 0;">+<span id="LC1184" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- pprEtaInfos eis = brackets $ vcat $ punctuate comma $ map ppr eis</span></span>
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1102
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1185
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<pre style="margin: 0;"> <span id="LC1185" class="line" lang="haskell"></span>
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1103
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1186
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<pre style="margin: 0;"> <span id="LC1186" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">pushCoercion :: Coercion -> [EtaInfo] -> [EtaInfo]</span></span>
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1187
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<pre style="margin: 0;">+<span id="LC1187" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- Puts a EtaCo on the front of a [EtaInfo], but combining</span></span>
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1188
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<pre style="margin: 0;">+<span id="LC1188" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- with an existing EtaCo if possible</span></span>
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1189
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<pre style="margin: 0;">+<span id="LC1189" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- A minor improvement</span></span>
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1104
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1190
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<pre style="margin: 0;"> <span id="LC1190" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">pushCoercion co1 (EtaCo co2 : eis)</span></span>
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1105
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1191
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<pre style="margin: 0;"> <span id="LC1191" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | isReflCo co = eis</span></span>
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1106
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1192
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<pre style="margin: 0;"> <span id="LC1192" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | otherwise = EtaCo co : eis</span></span>
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1107
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1193
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<pre style="margin: 0;"> <span id="LC1193" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> where</span></span>
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1108
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1194
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<pre style="margin: 0;"> <span id="LC1194" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> co = co1 `mkTransCo` co2</span></span>
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1109
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1195
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<pre style="margin: 0;"> <span id="LC1195" class="line" lang="haskell"></span>
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1110
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<pre style="margin: 0;">-<span id="LC1110" class="line" lang="haskell"><span class="n" style="color: #333;">pushCoercion</span> <span class="n" style="color: #333;">co</span> <span class="n" style="color: #333;">eis</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">EtaCo</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">eis</span></span>
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1196
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<pre style="margin: 0;">+<span id="LC1196" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">pushCoercion co eis</span></span>
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1197
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<pre style="margin: 0;">+<span id="LC1197" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = EtaCo co : eis</span></span>
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1198
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<pre style="margin: 0;">+<span id="LC1198" class="line" lang="haskell"></span>
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1199
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<pre style="margin: 0;">+<span id="LC1199" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">getArg_maybe :: [EtaInfo] -> Maybe (CoreArg, [EtaInfo])</span></span>
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1200
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<pre style="margin: 0;">+<span id="LC1200" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- Get an argument to the front of the [EtaInfo], if possible,</span></span>
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1201
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<pre style="margin: 0;">+<span id="LC1201" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- by pushing any EtaCo through the argument</span></span>
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1202
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<pre style="margin: 0;">+<span id="LC1202" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">getArg_maybe eis = go MRefl eis</span></span>
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1203
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<pre style="margin: 0;">+<span id="LC1203" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> where</span></span>
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1204
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<pre style="margin: 0;">+<span id="LC1204" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> go :: MCoercion -> [EtaInfo] -> Maybe (CoreArg, [EtaInfo])</span></span>
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1205
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<pre style="margin: 0;">+<span id="LC1205" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> go _ [] = Nothing</span></span>
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1206
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<pre style="margin: 0;">+<span id="LC1206" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> go mco (EtaCo co2 : eis) = go (mkTransMCoL mco co2) eis</span></span>
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1207
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<pre style="margin: 0;">+<span id="LC1207" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> go MRefl (EtaVar v : eis) = Just (varToCoreExpr v, eis)</span></span>
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1208
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<pre style="margin: 0;">+<span id="LC1208" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> go (MCo co) (EtaVar v : eis)</span></span>
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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;"> | Just (arg, mco) <- pushCoArg co (varToCoreExpr v)</span></span>
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1210
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<pre style="margin: 0;">+<span id="LC1210" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = case mco of</span></span>
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1211
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<pre style="margin: 0;">+<span id="LC1211" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MRefl -> Just (arg, eis)</span></span>
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1212
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<pre style="margin: 0;">+<span id="LC1212" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MCo co -> Just (arg, pushCoercion co eis)</span></span>
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1213
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<pre style="margin: 0;">+<span id="LC1213" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | otherwise</span></span>
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1214
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<pre style="margin: 0;">+<span id="LC1214" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = Nothing</span></span>
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1215
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<pre style="margin: 0;">+<span id="LC1215" class="line" lang="haskell"></span>
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1216
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<pre style="margin: 0;">+<span id="LC1216" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">mkCastMCo :: CoreExpr -> MCoercionR -> CoreExpr</span></span>
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1217
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<pre style="margin: 0;">+<span id="LC1217" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">mkCastMCo e MRefl = e</span></span>
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1218
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<pre style="margin: 0;">+<span id="LC1218" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">mkCastMCo e (MCo co) = Cast e co</span></span>
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1219
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<pre style="margin: 0;">+<span id="LC1219" class="line" lang="haskell"></span>
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1220
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<pre style="margin: 0;">+<span id="LC1220" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">mkPiMCo :: Var -> MCoercionR -> MCoercionR</span></span>
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1221
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<pre style="margin: 0;">+<span id="LC1221" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">mkPiMCo _ MRefl = MRefl</span></span>
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1222
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<pre style="margin: 0;">+<span id="LC1222" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">mkPiMCo v (MCo co) = MCo (mkPiCo Representational v co)</span></span>
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1111
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1223
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<pre style="margin: 0;"> <span id="LC1223" class="line" lang="haskell"></span>
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1112
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1224
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<pre style="margin: 0;"> <span id="LC1224" 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="LC1225" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">etaInfoAbs :: [EtaInfo] -> CoreExpr -> CoreExpr</span></span>
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<pre style="margin: 0;">-<span id="LC1114" class="line" lang="haskell"><span class="n" style="color: #333;">etaInfoAbs</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">expr</span></span>
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1115
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<pre style="margin: 0;">-<span id="LC1115" class="line" lang="haskell"><span class="n" style="color: #333;">etaInfoAbs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EtaVar</span> <span class="n" style="color: #333;">v</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">eis</span><span class="p">)</span> <span class="n" style="color: #333;">expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Lam</span> <span class="n" style="color: #333;">v</span> <span class="p">(</span><span class="n" style="color: #333;">etaInfoAbs</span> <span class="n" style="color: #333;">eis</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span></span>
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1116
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<pre style="margin: 0;">-<span id="LC1116" class="line" lang="haskell"><span class="n" style="color: #333;">etaInfoAbs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EtaCo</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">eis</span><span class="p">)</span> <span class="n" style="color: #333;">expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Cast</span> <span class="p">(</span><span class="n" style="color: #333;">etaInfoAbs</span> <span class="n" style="color: #333;">eis</span> <span class="n" style="color: #333;">expr</span><span class="p">)</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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1226
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<pre style="margin: 0;">+<span id="LC1226" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">etaInfoAbs eis expr</span></span>
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1227
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<pre style="margin: 0;">+<span id="LC1227" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | null eis = expr</span></span>
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1228
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<pre style="margin: 0;">+<span id="LC1228" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | otherwise = case final_mco of</span></span>
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1229
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<pre style="margin: 0;">+<span id="LC1229" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MRefl -> expr'</span></span>
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1230
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<pre style="margin: 0;">+<span id="LC1230" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MCo co -> mkCast expr' co</span></span>
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1231
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<pre style="margin: 0;">+<span id="LC1231" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> where</span></span>
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1232
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<pre style="margin: 0;">+<span id="LC1232" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (expr', final_mco) = foldr do_one (split_cast expr) eis</span></span>
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1233
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<pre style="margin: 0;">+<span id="LC1233" class="line" lang="haskell"></span>
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1234
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<pre style="margin: 0;">+<span id="LC1234" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> do_one :: EtaInfo -> (CoreExpr, MCoercion) -> (CoreExpr, MCoercion)</span></span>
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1235
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<pre style="margin: 0;">+<span id="LC1235" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> do_one (EtaVar v) (expr, mco) = (Lam v expr, mkPiMCo v mco)</span></span>
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1236
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<pre style="margin: 0;">+<span id="LC1236" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> do_one (EtaCo co) (expr, mco) = (expr, mco `mkTransMCoL` mkSymCo co)</span></span>
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1237
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<pre style="margin: 0;">+<span id="LC1237" class="line" lang="haskell"></span>
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1238
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<pre style="margin: 0;">+<span id="LC1238" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> split_cast :: CoreExpr -> (CoreExpr, MCoercion)</span></span>
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1239
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<pre style="margin: 0;">+<span id="LC1239" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> split_cast (Cast e co) = (e, MCo co)</span></span>
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1240
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<pre style="margin: 0;">+<span id="LC1240" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> split_cast e = (e, MRefl)</span></span>
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1241
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<pre style="margin: 0;">+<span id="LC1241" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- We could look in the body of lets, and the branches of a case</span></span>
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1242
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<pre style="margin: 0;">+<span id="LC1242" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- But then we would have to worry about whether the cast mentioned</span></span>
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1243
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<pre style="margin: 0;">+<span id="LC1243" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- any of the bound variables, which is tiresome. Later maybe.</span></span>
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<pre style="margin: 0;">+<span id="LC1244" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- Result: we may end up with</span></span>
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<pre style="margin: 0;">+<span id="LC1245" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- (\(x::Int). case x of { DEFAULT -> e1 |> co }) |> sym (<Int>->co)</span></span>
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1246
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<pre style="margin: 0;">+<span id="LC1246" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- and fail to optimise it away</span></span>
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1247
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<pre style="margin: 0;"> <span id="LC1247" class="line" lang="haskell"></span>
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1248
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<pre style="margin: 0;"> <span id="LC1248" 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="LC1119" class="line" lang="haskell"><span class="n" style="color: #333;">etaInfoApp</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Subs</span>t</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">EtaInfo</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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<pre style="margin: 0;">+<span id="LC1249" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">etaInfoApp :: <span class="idiff left right">InScopeSe</span>t -> CoreExpr -> [EtaInfo] -> CoreExpr</span></span>
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1120
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1250
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<pre style="margin: 0;"> <span id="LC1250" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- (etaInfoApp s e eis) returns something equivalent to</span></span>
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<pre style="margin: 0;">-<span id="LC1121" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (<span class="idiff left right">(substExpr s e)</span> `appliedto` eis)</span></span>
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1251
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<pre style="margin: 0;">+<span id="LC1251" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- (<span class="idiff left right">substExpr s e</span> `appliedto` eis)</span></span>
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1252
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<pre style="margin: 0;"> <span id="LC1252" class="line" lang="haskell"></span>
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1123
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<pre style="margin: 0;">-<span id="LC1123" class="line" lang="haskell"><span class="n" style="color: #333;">etaInfoApp</span> <span class="n" style="color: #333;">subst</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Lam</span> <span class="n" style="color: #333;">v1</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EtaVar</span> <span class="n" style="color: #333;">v2</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">eis</span><span class="p">)</span></span>
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1124
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<pre style="margin: 0;">-<span id="LC1124" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">etaInfoApp</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Core</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Subst</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">extendSubstWithVar</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">v1</span> <span class="n" style="color: #333;">v2</span><span class="p">)</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">eis</span></span>
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1125
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<pre style="margin: 0;">-<span id="LC1125" class="line" lang="haskell"></span>
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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;">etaInfoApp</span> <span class="n" style="color: #333;">subst</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Cast</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">co1</span><span class="p">)</span> <span class="n" style="color: #333;">eis</span></span>
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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="n" style="color: #333;">etaInfoApp</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">e</span> <span class="p">(</span><span class="n" style="color: #333;">pushCoercion</span> <span class="n" style="color: #333;">co'</span> <span class="n" style="color: #333;">eis</span><span class="p">)</span></span>
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1253
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<pre style="margin: 0;">+<span id="LC1253" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">etaInfoApp in_scope expr eis</span></span>
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<pre style="margin: 0;">+<span id="LC1254" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = go (mkEmptySubst in_scope) expr eis</span></span>
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1128
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1255
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<pre style="margin: 0;"> <span id="LC1255" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> where</span></span>
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1129
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<pre style="margin: 0;">-<span id="LC1129" class="line" lang="haskell"> <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;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Core</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Subst</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">substCo</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">co1</span></span>
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<pre style="margin: 0;">+<span id="LC1256" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> go :: Subst -> CoreExpr -> [EtaInfo] -> CoreExpr</span></span>
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1257
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<pre style="margin: 0;">+<span id="LC1257" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- 'go' pushed down the eta-infos into the branch of a case</span></span>
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1258
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<pre style="margin: 0;">+<span id="LC1258" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- and the body of a let; and does beta-reduction if possible</span></span>
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1259
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<pre style="margin: 0;">+<span id="LC1259" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> go subst (Tick t e) eis</span></span>
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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;"> = Tick (substTickish subst t) (go subst e eis)</span></span>
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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;"> go subst (Cast e co) eis</span></span>
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1262
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<pre style="margin: 0;">+<span id="LC1262" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = go subst e (pushCoercion (Core.substCo subst co) eis)</span></span>
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1263
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<pre style="margin: 0;">+<span id="LC1263" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> go subst (Case e b ty alts) eis</span></span>
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1264
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<pre style="margin: 0;">+<span id="LC1264" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = Case (Core.substExprSC subst e) b1 ty' alts'</span></span>
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1265
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<pre style="margin: 0;">+<span id="LC1265" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> where</span></span>
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1266
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<pre style="margin: 0;">+<span id="LC1266" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (subst1, b1) = Core.substBndr subst b</span></span>
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1267
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<pre style="margin: 0;">+<span id="LC1267" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> alts' = map subst_alt alts</span></span>
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1268
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<pre style="margin: 0;">+<span id="LC1268" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ty' = etaInfoAppTy (Core.substTy subst ty) eis</span></span>
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1269
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<pre style="margin: 0;">+<span id="LC1269" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> subst_alt (con, bs, rhs) = (con, bs', go subst2 rhs eis)</span></span>
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1270
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<pre style="margin: 0;">+<span id="LC1270" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> where</span></span>
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1271
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<pre style="margin: 0;">+<span id="LC1271" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (subst2,bs') = Core.substBndrs subst1 bs</span></span>
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1272
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<pre style="margin: 0;">+<span id="LC1272" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> go subst (Let b e) eis</span></span>
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1273
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<pre style="margin: 0;">+<span id="LC1273" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | not (isJoinBind b) -- See Note [Eta expansion for join points]</span></span>
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1274
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<pre style="margin: 0;">+<span id="LC1274" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = Let b' (go subst' e eis)</span></span>
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1275
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<pre style="margin: 0;">+<span id="LC1275" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> where</span></span>
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1276
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<pre style="margin: 0;">+<span id="LC1276" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (subst', b') = Core.substBindSC subst b</span></span>
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1130
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1277
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<pre style="margin: 0;"> <span id="LC1277" class="line" lang="haskell"></span>
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1131
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<pre style="margin: 0;">-<span id="LC1131" class="line" lang="haskell"><span class="n" style="color: #333;">etaInfoApp</span> <span class="n" style="color: #333;">subst</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Case</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">b</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">alts</span><span class="p">)</span> <span class="n" style="color: #333;">eis</span></span>
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1132
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<pre style="margin: 0;">-<span id="LC1132" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Case</span> <span class="p">(</span><span class="n" style="color: #333;">subst_expr</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="n" style="color: #333;">b1</span> <span class="n" style="color: #333;">ty'</span> <span class="n" style="color: #333;">alts'</span></span>
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1133
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<pre style="margin: 0;">-<span id="LC1133" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1134
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<pre style="margin: 0;">-<span id="LC1134" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">subst1</span><span class="p">,</span> <span class="n" style="color: #333;">b1</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substBndr</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">b</span></span>
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1135
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<pre style="margin: 0;">-<span id="LC1135" class="line" lang="haskell"> <span class="n" style="color: #333;">alts'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">subst_alt</span> <span class="n" style="color: #333;">alts</span></span>
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1136
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<pre style="margin: 0;">-<span id="LC1136" class="line" lang="haskell"> <span class="n" style="color: #333;">ty'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">etaInfoAppTy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Core</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Subst</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">substTy</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="n" style="color: #333;">eis</span></span>
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1137
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<pre style="margin: 0;">-<span id="LC1137" class="line" lang="haskell"> <span class="n" style="color: #333;">subst_alt</span> <span class="p">(</span><span class="n" style="color: #333;">con</span><span class="p">,</span> <span class="n" style="color: #333;">bs</span><span class="p">,</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">con</span><span class="p">,</span> <span class="n" style="color: #333;">bs'</span><span class="p">,</span> <span class="n" style="color: #333;">etaInfoApp</span> <span class="n" style="color: #333;">subst2</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">eis</span><span class="p">)</span></span>
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1138
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<pre style="margin: 0;">-<span id="LC1138" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1139
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<pre style="margin: 0;">-<span id="LC1139" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">subst2</span><span class="p">,</span><span class="n" style="color: #333;">bs'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substBndrs</span> <span class="n" style="color: #333;">subst1</span> <span class="n" style="color: #333;">bs</span></span>
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1140
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<pre style="margin: 0;">-<span id="LC1140" class="line" lang="haskell"></span>
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1141
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<pre style="margin: 0;">-<span id="LC1141" class="line" lang="haskell"><span class="n" style="color: #333;">etaInfoApp</span> <span class="n" style="color: #333;">subst</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Let</span> <span class="n" style="color: #333;">b</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="n" style="color: #333;">eis</span></span>
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1142
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<pre style="margin: 0;">-<span id="LC1142" class="line" lang="haskell"> <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;">isJoinBind</span> <span class="n" style="color: #333;">b</span><span class="p">)</span></span>
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1143
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<pre style="margin: 0;">-<span id="LC1143" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Eta expansion for join points]</span></span>
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1144
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<pre style="margin: 0;">-<span id="LC1144" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Let</span> <span class="n" style="color: #333;">b'</span> <span class="p">(</span><span class="n" style="color: #333;">etaInfoApp</span> <span class="n" style="color: #333;">subst'</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">eis</span><span class="p">)</span></span>
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1145
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<pre style="margin: 0;">-<span id="LC1145" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1146
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<pre style="margin: 0;">-<span id="LC1146" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">subst'</span><span class="p">,</span> <span class="n" style="color: #333;">b'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substBindSC</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">b</span></span>
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1278
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<pre style="margin: 0;">+<span id="LC1278" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- Beta-reduction if possible, using getArg_maybe to push</span></span>
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1279
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<pre style="margin: 0;">+<span id="LC1279" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- any intervening casts past the argument</span></span>
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1280
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<pre style="margin: 0;">+<span id="LC1280" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- See Note [The EtaInfo mechansim]</span></span>
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1281
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<pre style="margin: 0;">+<span id="LC1281" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> go subst (Lam v e) eis</span></span>
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1282
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<pre style="margin: 0;">+<span id="LC1282" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | Just (arg, eis') <- getArg_maybe eis</span></span>
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1283
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<pre style="margin: 0;">+<span id="LC1283" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = go (Core.extendSubst subst v arg) e eis'</span></span>
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1147
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1284
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<pre style="margin: 0;"> <span id="LC1284" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1148" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">etaInfoApp</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">subst</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Tick</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">t</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">e</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">eis</span></span></span>
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1149
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<pre style="margin: 0;">-<span id="LC1149" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><span class="idiff left">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Tick</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">substTickish</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">subst</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">t</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">etaInfoApp</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">subst</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">e</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">eis</span></span><span class="p"><span class="idiff right">)</span></span></span>
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1285
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<pre style="margin: 0;">+<span id="LC1285" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right"> -- Stop pushing down; just wrap the expression up</span></span></span>
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1286
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<pre style="margin: 0;">+<span id="LC1286" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right"> go subst e eis = wrap (Core.substExprSC subst e) eis</span></span></span>
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1150
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1287
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<pre style="margin: 0;"> <span id="LC1287" class="line" lang="haskell"></span>
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1151
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<pre style="margin: 0;">-<span id="LC1151" class="line" lang="haskell"><span class="n" style="color: #333;">etaInfoApp</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">expr</span> <span class="kr" style="font-weight: 600;">_</span></span>
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1152
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<pre style="margin: 0;">-<span id="LC1152" 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;">Var</span> <span class="n" style="color: #333;">fun</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">collectArgs</span> <span class="n" style="color: #333;">expr</span></span>
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1153
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<pre style="margin: 0;">-<span id="LC1153" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">fun'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupIdSubst</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">fun</span></span>
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1154
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<pre style="margin: 0;">-<span id="LC1154" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">isJoinId</span> <span class="n" style="color: #333;">fun'</span></span>
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1155
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<pre style="margin: 0;">-<span id="LC1155" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">subst_expr</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">expr</span></span>
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1156
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<pre style="margin: 0;">-<span id="LC1156" class="line" lang="haskell"></span>
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1157
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<pre style="margin: 0;">-<span id="LC1157" class="line" lang="haskell"><span class="n" style="color: #333;">etaInfoApp</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">eis</span></span>
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1158
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<pre style="margin: 0;">-<span id="LC1158" class="line" lang="haskell"> <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;">subst_expr</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="n" style="color: #333;">eis</span></span>
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1159
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<pre style="margin: 0;">-<span id="LC1159" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1160
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<pre style="margin: 0;">-<span id="LC1160" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">e</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">e</span></span>
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1161
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<pre style="margin: 0;">-<span id="LC1161" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">e</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EtaVar</span> <span class="n" style="color: #333;">v</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">eis</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">App</span> <span class="n" style="color: #333;">e</span> <span class="p">(</span><span class="n" style="color: #333;">varToCoreExpr</span> <span class="n" style="color: #333;">v</span><span class="p">))</span> <span class="n" style="color: #333;">eis</span></span>
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1162
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<pre style="margin: 0;">-<span id="LC1162" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">e</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EtaCo</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">eis</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Cast</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="n" style="color: #333;">eis</span></span>
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1288
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<pre style="margin: 0;">+<span id="LC1288" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> wrap e [] = e</span></span>
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1289
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<pre style="margin: 0;">+<span id="LC1289" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> wrap e (EtaVar v : eis) = wrap (App e (varToCoreExpr v)) eis</span></span>
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1290
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<pre style="margin: 0;">+<span id="LC1290" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> wrap e (EtaCo co : eis) = wrap (Cast e co) eis</span></span>
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<pre style="margin: 0;"> <span id="LC1291" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1292" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1293" 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">@@ -1235,7 +1363,7 @@ mkEtaWW orig_oss ppr_orig_expr in_scope orig_ty</td>
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<pre style="margin: 0;"> <span id="LC1363" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- We want to get</span></span>
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1236
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<pre style="margin: 0;"> <span id="LC1364" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- coerce T (\x::[T] -> (coerce ([T]->Int) e) x)</span></span>
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<pre style="margin: 0;"> <span id="LC1365" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | Just (co, ty') <- topNormaliseNewType_maybe ty</span></span>
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1238
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<pre style="margin: 0;">-<span id="LC1238" 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="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Coercion</span></span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">substCo</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">co</span></span>
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<pre style="margin: 0;">+<span id="LC1366" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> , let co' = <span class="idiff left right">Type</span>.substCo subst co</span></span>
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<pre style="margin: 0;"> <span id="LC1367" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- Remember to apply the substitution to co (#16979)</span></span>
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<pre style="margin: 0;"> <span id="LC1368" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- (or we could have applied to ty, but then</span></span>
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<pre style="margin: 0;"> <span id="LC1369" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- we'd have had to zap it for the recursive call)</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">@@ -1253,21 +1381,288 @@ mkEtaWW orig_oss ppr_orig_expr in_scope orig_ty</td>
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<pre style="margin: 0;"> <span id="LC1381" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- with an explicit lambda having a non-function type</span></span>
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1382
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<pre style="margin: 0;"> <span id="LC1382" class="line" lang="haskell"></span>
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1383
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<pre style="margin: 0;"> <span id="LC1383" class="line" lang="haskell"></span>
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1384
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<pre style="margin: 0;">+<span id="LC1384" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *********************************************************************</span></span>
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1385
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<pre style="margin: 0;">+<span id="LC1385" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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1386
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<pre style="margin: 0;">+<span id="LC1386" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The "push rules"</span></span>
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1387
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<pre style="margin: 0;">+<span id="LC1387" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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1388
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<pre style="margin: 0;">+<span id="LC1388" 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="LC1389" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1390" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here we implement the "push rules" from FC papers:</span></span>
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1391
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<pre style="margin: 0;">+<span id="LC1391" class="line" lang="haskell"></span>
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1392
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<pre style="margin: 0;">+<span id="LC1392" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* The push-argument rules, where we can move a coercion past an argument.</span></span>
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1393
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<pre style="margin: 0;">+<span id="LC1393" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We have</span></span>
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1394
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<pre style="margin: 0;">+<span id="LC1394" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (fun |> co) arg</span></span>
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1395
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<pre style="margin: 0;">+<span id="LC1395" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> and we want to transform it to</span></span>
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1396
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<pre style="margin: 0;">+<span id="LC1396" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (fun arg') |> co'</span></span>
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1397
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<pre style="margin: 0;">+<span id="LC1397" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> for some suitable co' and transformed arg'.</span></span>
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1398
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<pre style="margin: 0;">+<span id="LC1398" class="line" lang="haskell"></span>
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1399
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<pre style="margin: 0;">+<span id="LC1399" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* The PushK rule for data constructors. We have</span></span>
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1400
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<pre style="margin: 0;">+<span id="LC1400" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (K e1 .. en) |> co</span></span>
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1401
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<pre style="margin: 0;">+<span id="LC1401" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> and we want to transform to</span></span>
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1402
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<pre style="margin: 0;">+<span id="LC1402" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (K e1' .. en')</span></span>
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1403
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<pre style="margin: 0;">+<span id="LC1403" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> by pushing the coercion into the arguments</span></span>
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1404
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<pre style="margin: 0;">+<span id="LC1404" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1405
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<pre style="margin: 0;">+<span id="LC1405" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1406" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">pushCoArgs :: CoercionR -> [CoreArg] -> Maybe ([CoreArg], MCoercion)</span></span>
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<pre style="margin: 0;">+<span id="LC1407" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">pushCoArgs co [] = return ([], MCo co)</span></span>
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<pre style="margin: 0;">+<span id="LC1408" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">pushCoArgs co (arg:args) = do { (arg', m_co1) <- pushCoArg co arg</span></span>
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1409
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<pre style="margin: 0;">+<span id="LC1409" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; case m_co1 of</span></span>
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<pre style="margin: 0;">+<span id="LC1410" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MCo co1 -> do { (args', m_co2) <- pushCoArgs co1 args</span></span>
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<pre style="margin: 0;">+<span id="LC1411" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; return (arg':args', m_co2) }</span></span>
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<pre style="margin: 0;">+<span id="LC1412" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MRefl -> return (arg':args, MRefl) }</span></span>
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<pre style="margin: 0;">+<span id="LC1413" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1414" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">pushCoArg :: CoercionR -> CoreArg -> Maybe (CoreArg, MCoercion)</span></span>
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<pre style="margin: 0;">+<span id="LC1415" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- We have (fun |> co) arg, and we want to transform it to</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1416" 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">
1416
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<pre style="margin: 0;">+<span id="LC1416" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- (fun arg) |> co</span></span>
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1417
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<pre style="margin: 0;">+<span id="LC1417" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- This may fail, e.g. if (fun :: N) where N is a newtype</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1418" 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">
1418
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<pre style="margin: 0;">+<span id="LC1418" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- C.f. simplCast in GHC.Core.Opt.Simplify</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1419" 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">
1419
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<pre style="margin: 0;">+<span id="LC1419" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- 'co' is always Representational</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1420" 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">
1420
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<pre style="margin: 0;">+<span id="LC1420" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- If the returned coercion is Nothing, then it would have been reflexive</span></span>
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1421
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<pre style="margin: 0;">+<span id="LC1421" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">pushCoArg co (Type ty) = do { (ty', m_co') <- pushCoTyArg co ty</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1422" 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">
1422
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<pre style="margin: 0;">+<span id="LC1422" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; return (Type ty', m_co') }</span></span>
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1423
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<pre style="margin: 0;">+<span id="LC1423" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">pushCoArg co val_arg = do { (arg_co, m_co') <- pushCoValArg co</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1424" 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">
1424
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<pre style="margin: 0;">+<span id="LC1424" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; return (val_arg `mkCastMCo` arg_co, m_co') }</span></span>
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1425
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<pre style="margin: 0;">+<span id="LC1425" class="line" lang="haskell"></span>
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1426
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<pre style="margin: 0;">+<span id="LC1426" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">pushCoTyArg :: CoercionR -> Type -> Maybe (Type, MCoercionR)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1427" 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">
1427
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<pre style="margin: 0;">+<span id="LC1427" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- We have (fun |> co) @ty</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="cm" style="color: #998; font-style: italic;">-- Push the coercion through to return</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1429" 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">
1429
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<pre style="margin: 0;">+<span id="LC1429" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- (fun @ty') |> co'</span></span>
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1430
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<pre style="margin: 0;">+<span id="LC1430" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- 'co' is always Representational</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1431" 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">
1431
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<pre style="margin: 0;">+<span id="LC1431" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- If the returned coercion is Nothing, then it would have been reflexive;</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1432" 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">
1432
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<pre style="margin: 0;">+<span id="LC1432" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- it's faster not to compute it, though.</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1433" 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">
1433
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<pre style="margin: 0;">+<span id="LC1433" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">pushCoTyArg co ty</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1434" 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">
1434
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<pre style="margin: 0;">+<span id="LC1434" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- The following is inefficient - don't do `eqType` here, the coercion</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1435" 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">
1435
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<pre style="margin: 0;">+<span id="LC1435" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- optimizer will take care of it. See #14737.</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1436" 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">
1436
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<pre style="margin: 0;">+<span id="LC1436" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- -- | tyL `eqType` tyR</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1437" 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">
1437
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<pre style="margin: 0;">+<span id="LC1437" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- -- = Just (ty, Nothing)</span></span>
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1438
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<pre style="margin: 0;">+<span id="LC1438" class="line" lang="haskell"></span>
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<td class="diff-line-num new new_line" data-linenumber="1439" 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">
1439
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<pre style="margin: 0;">+<span id="LC1439" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | isReflCo co</span></span>
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1440
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<pre style="margin: 0;">+<span id="LC1440" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = Just (ty, MRefl)</span></span>
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1441
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<pre style="margin: 0;">+<span id="LC1441" class="line" lang="haskell"></span>
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1442
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<pre style="margin: 0;">+<span id="LC1442" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | isForAllTy_ty tyL</span></span>
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1443
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<pre style="margin: 0;">+<span id="LC1443" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = ASSERT2( isForAllTy_ty tyR, ppr co $$ ppr ty )</span></span>
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1444
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<pre style="margin: 0;">+<span id="LC1444" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Just (ty `mkCastTy` co1, MCo co2)</span></span>
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1445
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<pre style="margin: 0;">+<span id="LC1445" class="line" lang="haskell"></span>
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1446
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<pre style="margin: 0;">+<span id="LC1446" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | otherwise</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1447" 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">
1447
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<pre style="margin: 0;">+<span id="LC1447" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = Nothing</span></span>
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1448
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<pre style="margin: 0;">+<span id="LC1448" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> where</span></span>
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1449
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<pre style="margin: 0;">+<span id="LC1449" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Pair tyL tyR = coercionKind co</span></span>
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1450
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<pre style="margin: 0;">+<span id="LC1450" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- co :: tyL ~ tyR</span></span>
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1451
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<pre style="margin: 0;">+<span id="LC1451" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- tyL = forall (a1 :: k1). ty1</span></span>
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1452
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<pre style="margin: 0;">+<span id="LC1452" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- tyR = forall (a2 :: k2). ty2</span></span>
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1453
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<pre style="margin: 0;">+<span id="LC1453" class="line" lang="haskell"></span>
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1454
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<pre style="margin: 0;">+<span id="LC1454" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> co1 = mkSymCo (mkNthCo Nominal 0 co)</span></span>
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1455
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<pre style="margin: 0;">+<span id="LC1455" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- co1 :: k2 ~N k1</span></span>
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1456
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<pre style="margin: 0;">+<span id="LC1456" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- Note that NthCo can extract a Nominal equality between the</span></span>
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1457
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<pre style="margin: 0;">+<span id="LC1457" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- kinds of the types related by a coercion between forall-types.</span></span>
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1458
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<pre style="margin: 0;">+<span id="LC1458" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- See the NthCo case in GHC.Core.Lint.</span></span>
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1459
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<pre style="margin: 0;">+<span id="LC1459" class="line" lang="haskell"></span>
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1460
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<pre style="margin: 0;">+<span id="LC1460" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> co2 = mkInstCo co (mkGReflLeftCo Nominal ty co1)</span></span>
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1461
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<pre style="margin: 0;">+<span id="LC1461" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- co2 :: ty1[ (ty|>co1)/a1 ] ~ ty2[ ty/a2 ]</span></span>
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1462
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<pre style="margin: 0;">+<span id="LC1462" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- Arg of mkInstCo is always nominal, hence mkNomReflCo</span></span>
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1463
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<pre style="margin: 0;">+<span id="LC1463" class="line" lang="haskell"></span>
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1464
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<pre style="margin: 0;">+<span id="LC1464" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">pushCoValArg :: CoercionR -> Maybe (MCoercionR, MCoercionR)</span></span>
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1465
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<pre style="margin: 0;">+<span id="LC1465" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- We have (fun |> co) arg</span></span>
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1466
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<pre style="margin: 0;">+<span id="LC1466" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- Push the coercion through to return</span></span>
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1467
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<pre style="margin: 0;">+<span id="LC1467" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- (fun (arg |> co_arg)) |> co_res</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1468" 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">
1468
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<pre style="margin: 0;">+<span id="LC1468" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- 'co' is always Representational</span></span>
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1469
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<pre style="margin: 0;">+<span id="LC1469" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- If the second returned Coercion is actually Nothing, then no cast is necessary;</span></span>
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1470
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<pre style="margin: 0;">+<span id="LC1470" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- the returned coercion would have been reflexive.</span></span>
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1471
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<pre style="margin: 0;">+<span id="LC1471" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">pushCoValArg 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="cm" style="color: #998; font-style: italic;"> -- The following is inefficient - don't do `eqType` here, the coercion</span></span>
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1473
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<pre style="margin: 0;">+<span id="LC1473" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- optimizer will take care of it. See #14737.</span></span>
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1474
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<pre style="margin: 0;">+<span id="LC1474" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- -- | tyL `eqType` tyR</span></span>
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1475
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<pre style="margin: 0;">+<span id="LC1475" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- -- = Just (mkRepReflCo arg, Nothing)</span></span>
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1476
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<pre style="margin: 0;">+<span id="LC1476" class="line" lang="haskell"></span>
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1477
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<pre style="margin: 0;">+<span id="LC1477" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | isReflCo co</span></span>
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1478
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<pre style="margin: 0;">+<span id="LC1478" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = Just (MRefl, MRefl)</span></span>
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1479
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<pre style="margin: 0;">+<span id="LC1479" class="line" lang="haskell"></span>
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1480
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<pre style="margin: 0;">+<span id="LC1480" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | isFunTy tyL</span></span>
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1481
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<pre style="margin: 0;">+<span id="LC1481" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> , (co_mult, co1, co2) <- decomposeFunCo Representational co</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1482" 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">
1482
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<pre style="margin: 0;">+<span id="LC1482" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> , isReflexiveCo co_mult</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1483" 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">
1483
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<pre style="margin: 0;">+<span id="LC1483" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- We can't push the coercion in the case where co_mult isn't reflexivity:</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1484" 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">
1484
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<pre style="margin: 0;">+<span id="LC1484" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- it could be an unsafe axiom, and losing this information could yield</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1485" 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">
1485
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<pre style="margin: 0;">+<span id="LC1485" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- ill-typed terms. For instance (fun x ::(1) Int -> (fun _ -> () |> co) x)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1486" 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">
1486
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<pre style="margin: 0;">+<span id="LC1486" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- with co :: (Int -> ()) ~ (Int #-> ()), would reduce to (fun x ::(1) Int</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1487" 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">
1487
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<pre style="margin: 0;">+<span id="LC1487" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- -> (fun _ ::(Many) Int -> ()) x) which is ill-typed</span></span>
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1488
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<pre style="margin: 0;">+<span id="LC1488" class="line" lang="haskell"></span>
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1489
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<pre style="margin: 0;">+<span id="LC1489" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- If co :: (tyL1 -> tyL2) ~ (tyR1 -> tyR2)</span></span>
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1490
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<pre style="margin: 0;">+<span id="LC1490" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- then co1 :: tyL1 ~ tyR1</span></span>
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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;"> -- co2 :: tyL2 ~ tyR2</span></span>
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1492
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<pre style="margin: 0;">+<span id="LC1492" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = ASSERT2( isFunTy tyR, ppr co $$ ppr arg )</span></span>
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1493
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<pre style="margin: 0;">+<span id="LC1493" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Just (coToMCo (mkSymCo co1), coToMCo co2)</span></span>
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1494
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<pre style="margin: 0;">+<span id="LC1494" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- Use coToMCo to check for reflexivity; the whole coercion may not</span></span>
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1495
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<pre style="margin: 0;">+<span id="LC1495" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- be reflexive, but either of its components might be</span></span>
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1496
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<pre style="margin: 0;">+<span id="LC1496" class="line" lang="haskell"></span>
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1497
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<pre style="margin: 0;">+<span id="LC1497" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | otherwise</span></span>
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1498
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<pre style="margin: 0;">+<span id="LC1498" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = Nothing</span></span>
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1499
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<pre style="margin: 0;">+<span id="LC1499" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> where</span></span>
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1500
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<pre style="margin: 0;">+<span id="LC1500" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> arg = funArgTy tyR</span></span>
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1501
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<pre style="margin: 0;">+<span id="LC1501" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Pair tyL tyR = coercionKind co</span></span>
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1502
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<pre style="margin: 0;">+<span id="LC1502" class="line" lang="haskell"></span>
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1503
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<pre style="margin: 0;">+<span id="LC1503" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">pushCoercionIntoLambda</span></span>
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1504
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<pre style="margin: 0;">+<span id="LC1504" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> :: InScopeSet -> Var -> CoreExpr -> CoercionR -> Maybe (Var, CoreExpr)</span></span>
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1505
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<pre style="margin: 0;">+<span id="LC1505" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- This implements the Push rule from the paper on coercions</span></span>
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1506
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<pre style="margin: 0;">+<span id="LC1506" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- (\x. e) |> co</span></span>
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1507
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<pre style="margin: 0;">+<span id="LC1507" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- ===></span></span>
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1508
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<pre style="margin: 0;">+<span id="LC1508" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- (\x'. e |> co')</span></span>
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1509
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<pre style="margin: 0;">+<span id="LC1509" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">pushCoercionIntoLambda in_scope x e co</span></span>
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1510
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<pre style="margin: 0;">+<span id="LC1510" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | ASSERT(not (isTyVar x) && not (isCoVar x)) True</span></span>
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1511
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<pre style="margin: 0;">+<span id="LC1511" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> , Pair s1s2 t1t2 <- coercionKind co</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1512" 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">
1512
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<pre style="margin: 0;">+<span id="LC1512" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> , Just (_, _s1,_s2) <- splitFunTy_maybe s1s2</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1513" 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">
1513
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<pre style="margin: 0;">+<span id="LC1513" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> , Just (w1, t1,_t2) <- splitFunTy_maybe t1t2</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1514" 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">
1514
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<pre style="margin: 0;">+<span id="LC1514" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> , (co_mult, co1, co2) <- decomposeFunCo Representational co</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1515" 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">
1515
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<pre style="margin: 0;">+<span id="LC1515" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> , isReflexiveCo co_mult</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1516" 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">
1516
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<pre style="margin: 0;">+<span id="LC1516" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- We can't push the coercion in the case where co_mult isn't</span></span>
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1517
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<pre style="margin: 0;">+<span id="LC1517" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- reflexivity. See pushCoValArg for more details.</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1518" 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">
1518
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<pre style="margin: 0;">+<span id="LC1518" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = let</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1519" 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">
1519
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<pre style="margin: 0;">+<span id="LC1519" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- Should we optimize the coercions here?</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1520" 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">
1520
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<pre style="margin: 0;">+<span id="LC1520" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- Otherwise they might not match too well</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1521" 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">
1521
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<pre style="margin: 0;">+<span id="LC1521" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> x' = x `setIdType` t1 `setIdMult` w1</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1522" 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">
1522
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<pre style="margin: 0;">+<span id="LC1522" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in_scope' = in_scope `extendInScopeSet` x'</span></span>
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1523
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<pre style="margin: 0;">+<span id="LC1523" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> subst = extendIdSubst (mkEmptySubst in_scope')</span></span>
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1524
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<pre style="margin: 0;">+<span id="LC1524" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> x</span></span>
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1525
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<pre style="margin: 0;">+<span id="LC1525" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (mkCast (Var x') co1)</span></span>
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1526
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<pre style="margin: 0;">+<span id="LC1526" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in Just (x', substExpr subst e `mkCast` co2)</span></span>
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1527
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<pre style="margin: 0;">+<span id="LC1527" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | otherwise</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1528" 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">
1528
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<pre style="margin: 0;">+<span id="LC1528" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = pprTrace "exprIsLambda_maybe: Unexpected lambda in case" (ppr (Lam x e))</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1529" 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">
1529
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<pre style="margin: 0;">+<span id="LC1529" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Nothing</span></span>
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1530
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<pre style="margin: 0;">+<span id="LC1530" class="line" lang="haskell"></span>
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<td class="diff-line-num new new_line" data-linenumber="1531" 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">
1531
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<pre style="margin: 0;">+<span id="LC1531" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">pushCoDataCon :: DataCon -> [CoreExpr] -> Coercion</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1532" 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">
1532
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<pre style="margin: 0;">+<span id="LC1532" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -> Maybe (DataCon</span></span>
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1533
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<pre style="margin: 0;">+<span id="LC1533" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> , [Type] -- Universal type args</span></span>
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1534
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<pre style="margin: 0;">+<span id="LC1534" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> , [CoreExpr]) -- All other args incl existentials</span></span>
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1535
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<pre style="margin: 0;">+<span id="LC1535" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- Implement the KPush reduction rule as described in "Down with kinds"</span></span>
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1536
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<pre style="margin: 0;">+<span id="LC1536" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- The transformation applies iff we have</span></span>
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1537
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<pre style="margin: 0;">+<span id="LC1537" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- (C e1 ... en) `cast` co</span></span>
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1538
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<pre style="margin: 0;">+<span id="LC1538" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- where co :: (T t1 .. tn) ~ to_ty</span></span>
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1539
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<pre style="margin: 0;">+<span id="LC1539" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- The left-hand one must be a T, because exprIsConApp returned True</span></span>
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1540
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<pre style="margin: 0;">+<span id="LC1540" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- but the right-hand one might not be. (Though it usually will.)</span></span>
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1541
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<pre style="margin: 0;">+<span id="LC1541" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">pushCoDataCon dc dc_args co</span></span>
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1542
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<pre style="margin: 0;">+<span id="LC1542" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | isReflCo co || from_ty `eqType` to_ty -- try cheap test first</span></span>
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1543
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<pre style="margin: 0;">+<span id="LC1543" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> , let (univ_ty_args, rest_args) = splitAtList (dataConUnivTyVars dc) dc_args</span></span>
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1544
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<pre style="margin: 0;">+<span id="LC1544" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = Just (dc, map exprToType univ_ty_args, rest_args)</span></span>
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1545
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<pre style="margin: 0;">+<span id="LC1545" class="line" lang="haskell"></span>
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1546
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<pre style="margin: 0;">+<span id="LC1546" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | Just (to_tc, to_tc_arg_tys) <- splitTyConApp_maybe to_ty</span></span>
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1547
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<pre style="margin: 0;">+<span id="LC1547" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> , to_tc == dataConTyCon dc</span></span>
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1548
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<pre style="margin: 0;">+<span id="LC1548" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- These two tests can fail; we might see</span></span>
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1549
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<pre style="margin: 0;">+<span id="LC1549" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- (C x y) `cast` (g :: T a ~ S [a]),</span></span>
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1550
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<pre style="margin: 0;">+<span id="LC1550" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- where S is a type function. In fact, exprIsConApp</span></span>
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1551
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<pre style="margin: 0;">+<span id="LC1551" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- will probably not be called in such circumstances,</span></span>
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1552
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<pre style="margin: 0;">+<span id="LC1552" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- but there's nothing wrong with it</span></span>
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1553
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<pre style="margin: 0;">+<span id="LC1553" class="line" lang="haskell"></span>
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1554
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<pre style="margin: 0;">+<span id="LC1554" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = let</span></span>
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1555
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<pre style="margin: 0;">+<span id="LC1555" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> tc_arity = tyConArity to_tc</span></span>
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1556
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<pre style="margin: 0;">+<span id="LC1556" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> dc_univ_tyvars = dataConUnivTyVars dc</span></span>
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1557
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<pre style="margin: 0;">+<span id="LC1557" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> dc_ex_tcvars = dataConExTyCoVars dc</span></span>
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1558
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<pre style="margin: 0;">+<span id="LC1558" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> arg_tys = dataConRepArgTys dc</span></span>
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1559
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<pre style="margin: 0;">+<span id="LC1559" class="line" lang="haskell"></span>
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1560
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<pre style="margin: 0;">+<span id="LC1560" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> non_univ_args = dropList dc_univ_tyvars dc_args</span></span>
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1561
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<pre style="margin: 0;">+<span id="LC1561" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (ex_args, val_args) = splitAtList dc_ex_tcvars non_univ_args</span></span>
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1562
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<pre style="margin: 0;">+<span id="LC1562" class="line" lang="haskell"></span>
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1563
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<pre style="margin: 0;">+<span id="LC1563" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- Make the "Psi" from the paper</span></span>
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1564
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<pre style="margin: 0;">+<span id="LC1564" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> omegas = decomposeCo tc_arity co (tyConRolesRepresentational to_tc)</span></span>
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1565
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<pre style="margin: 0;">+<span id="LC1565" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (psi_subst, to_ex_arg_tys)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1566" 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">
1566
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<pre style="margin: 0;">+<span id="LC1566" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = liftCoSubstWithEx Representational</span></span>
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1567
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<pre style="margin: 0;">+<span id="LC1567" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> dc_univ_tyvars</span></span>
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1568
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<pre style="margin: 0;">+<span id="LC1568" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> omegas</span></span>
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1569
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<pre style="margin: 0;">+<span id="LC1569" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> dc_ex_tcvars</span></span>
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1570
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<pre style="margin: 0;">+<span id="LC1570" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (map exprToType ex_args)</span></span>
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1571
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<pre style="margin: 0;">+<span id="LC1571" class="line" lang="haskell"></span>
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1572
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<pre style="margin: 0;">+<span id="LC1572" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- Cast the value arguments (which include dictionaries)</span></span>
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1573
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<pre style="margin: 0;">+<span id="LC1573" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> new_val_args = zipWith cast_arg (map scaledThing arg_tys) val_args</span></span>
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1574
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<pre style="margin: 0;">+<span id="LC1574" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> cast_arg arg_ty arg = mkCast arg (psi_subst arg_ty)</span></span>
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1575
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<pre style="margin: 0;">+<span id="LC1575" class="line" lang="haskell"></span>
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1576
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<pre style="margin: 0;">+<span id="LC1576" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> to_ex_args = map Type to_ex_arg_tys</span></span>
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1577
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<pre style="margin: 0;">+<span id="LC1577" class="line" lang="haskell"></span>
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1578
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<pre style="margin: 0;">+<span id="LC1578" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> dump_doc = vcat [ppr dc, ppr dc_univ_tyvars, ppr dc_ex_tcvars,</span></span>
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1579
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<pre style="margin: 0;">+<span id="LC1579" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ppr arg_tys, ppr dc_args,</span></span>
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1580
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<pre style="margin: 0;">+<span id="LC1580" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ppr ex_args, ppr val_args, ppr co, ppr from_ty, ppr to_ty, ppr to_tc</span></span>
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1581
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<pre style="margin: 0;">+<span id="LC1581" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> , ppr $ mkTyConApp to_tc (map exprToType $ takeList dc_univ_tyvars dc_args) ]</span></span>
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1582
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<pre style="margin: 0;">+<span id="LC1582" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in</span></span>
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1583
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<pre style="margin: 0;">+<span id="LC1583" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ASSERT2( eqType from_ty (mkTyConApp to_tc (map exprToType $ takeList dc_univ_tyvars dc_args)), dump_doc )</span></span>
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1584
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<pre style="margin: 0;">+<span id="LC1584" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ASSERT2( equalLength val_args arg_tys, dump_doc )</span></span>
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1585
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<pre style="margin: 0;">+<span id="LC1585" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Just (dc, to_tc_arg_tys, to_ex_args ++ new_val_args)</span></span>
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1586
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<pre style="margin: 0;">+<span id="LC1586" class="line" lang="haskell"></span>
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1587
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<pre style="margin: 0;">+<span id="LC1587" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | otherwise</span></span>
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1588
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<pre style="margin: 0;">+<span id="LC1588" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = Nothing</span></span>
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1589
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<pre style="margin: 0;">+<span id="LC1589" class="line" lang="haskell"></span>
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1590
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<pre style="margin: 0;">+<span id="LC1590" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> where</span></span>
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1591
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<pre style="margin: 0;">+<span id="LC1591" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Pair from_ty to_ty = coercionKind co</span></span>
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1256
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1592
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<pre style="margin: 0;"> <span id="LC1592" class="line" lang="haskell"></span>
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1257
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<pre style="margin: 0;">-<span id="LC1257" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">------------</span></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;"><span class="idiff left">subst_expr</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Subst</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">CoreExpr</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">CoreExpr</span></span></span>
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1259
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<pre style="margin: 0;">-<span id="LC1259" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">Apply a substitution to an expression. We use substExpr</span></span></span>
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1260
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<pre style="margin: 0;">-<span id="LC1260" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">not substExprSC (short-cutting substitution) because</span></span></span>
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1261
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<pre style="margin: 0;">-<span id="LC1261" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--<span class="idiff left right"> we may be changing the types of join points, so applying</span></span></span>
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1262
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<pre style="margin: 0;">-<span id="LC1262" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">the in-scope set is necessary.</span></span></span>
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1593
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<pre style="margin: 0;">+<span id="LC1593" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">collectBindersPushingCo :: CoreExpr -> ([Var], CoreExpr)</span></span></span>
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1594
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<pre style="margin: 0;">+<span id="LC1594" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">-- Collect lambda binders, pushing coercions inside if possible</span></span></span>
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<td class="diff-line-num new new_line" data-linenumber="1595" 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">
1595
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<pre style="margin: 0;">+<span id="LC1595" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- <span class="idiff left right">E.g. (\x.e) |> g g :: <Int> -> blah</span></span></span>
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<td class="diff-line-num new new_line" data-linenumber="1596" 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">
1596
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<pre style="margin: 0;">+<span id="LC1596" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- <span class="idiff left right"> = (\x. e |> Nth 1 g)</span></span></span>
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1597
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<pre style="margin: 0;">+<span id="LC1597" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">--</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1598" 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">
1598
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<pre style="margin: 0;">+<span id="LC1598" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- <span class="idiff left right">That is,</span></span></span>
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1263
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1599
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<pre style="margin: 0;"> <span id="LC1599" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">--</span></span>
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1264
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<pre style="margin: 0;">-<span id="LC1264" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ToDo: we could instead check if we actually *are*</span></span>
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1265
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<pre style="margin: 0;">-<span id="LC1265" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- changing any join points' types, and if not use substExprSC.</span></span>
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1266
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<pre style="margin: 0;">-<span id="LC1266" class="line" lang="haskell"><span class="n" style="color: #333;">subst_expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substExpr</span></span>
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1600
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<pre style="margin: 0;">+<span id="LC1600" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- collectBindersPushingCo ((\x.e) |> g) === ([x], e |> Nth 1 g)</span></span>
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1601
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<pre style="margin: 0;">+<span id="LC1601" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">collectBindersPushingCo e</span></span>
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1602
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<pre style="margin: 0;">+<span id="LC1602" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = go [] e</span></span>
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1603
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<pre style="margin: 0;">+<span id="LC1603" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> where</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1604" 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">
1604
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<pre style="margin: 0;">+<span id="LC1604" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- Peel off lambdas until we hit a cast.</span></span>
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1605
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<pre style="margin: 0;">+<span id="LC1605" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> go :: [Var] -> CoreExpr -> ([Var], CoreExpr)</span></span>
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1606
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<pre style="margin: 0;">+<span id="LC1606" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- The accumulator is in reverse order</span></span>
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1607
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<pre style="margin: 0;">+<span id="LC1607" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> go bs (Lam b e) = go (b:bs) e</span></span>
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1608
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<pre style="margin: 0;">+<span id="LC1608" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> go bs (Cast e co) = go_c bs e co</span></span>
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1609
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<pre style="margin: 0;">+<span id="LC1609" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> go bs e = (reverse bs, e)</span></span>
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1610
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<pre style="margin: 0;">+<span id="LC1610" class="line" lang="haskell"></span>
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1611
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<pre style="margin: 0;">+<span id="LC1611" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- We are in a cast; peel off casts until we hit a lambda.</span></span>
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1612
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<pre style="margin: 0;">+<span id="LC1612" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> go_c :: [Var] -> CoreExpr -> CoercionR -> ([Var], CoreExpr)</span></span>
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1613
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<pre style="margin: 0;">+<span id="LC1613" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- (go_c bs e c) is same as (go bs e (e |> c))</span></span>
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1614
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<pre style="margin: 0;">+<span id="LC1614" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> go_c bs (Cast e co1) co2 = go_c bs e (co1 `mkTransCo` co2)</span></span>
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1615
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<pre style="margin: 0;">+<span id="LC1615" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> go_c bs (Lam b e) co = go_lam bs b e co</span></span>
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1616
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<pre style="margin: 0;">+<span id="LC1616" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> go_c bs e co = (reverse bs, mkCast e co)</span></span>
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1617
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<pre style="margin: 0;">+<span id="LC1617" class="line" lang="haskell"></span>
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1618
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<pre style="margin: 0;">+<span id="LC1618" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- We are in a lambda under a cast; peel off lambdas and build a</span></span>
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1619
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<pre style="margin: 0;">+<span id="LC1619" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- new coercion for the body.</span></span>
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1620
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<pre style="margin: 0;">+<span id="LC1620" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> go_lam :: [Var] -> Var -> CoreExpr -> CoercionR -> ([Var], CoreExpr)</span></span>
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1621
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<pre style="margin: 0;">+<span id="LC1621" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- (go_lam bs b e c) is same as (go_c bs (\b.e) c)</span></span>
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1622
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<pre style="margin: 0;">+<span id="LC1622" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> go_lam bs b e co</span></span>
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1623
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<pre style="margin: 0;">+<span id="LC1623" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | isTyVar b</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1624" 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">
1624
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<pre style="margin: 0;">+<span id="LC1624" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> , let Pair tyL tyR = coercionKind co</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1625" 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">
1625
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<pre style="margin: 0;">+<span id="LC1625" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> , ASSERT( isForAllTy_ty tyL )</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1626" 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">
1626
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<pre style="margin: 0;">+<span id="LC1626" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> isForAllTy_ty tyR</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1627" 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">
1627
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<pre style="margin: 0;">+<span id="LC1627" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> , isReflCo (mkNthCo Nominal 0 co) -- See Note [collectBindersPushingCo]</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1628" 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">
1628
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<pre style="margin: 0;">+<span id="LC1628" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = go_c (b:bs) e (mkInstCo co (mkNomReflCo (mkTyVarTy b)))</span></span>
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1629
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<pre style="margin: 0;">+<span id="LC1629" class="line" lang="haskell"></span>
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1630
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<pre style="margin: 0;">+<span id="LC1630" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | isCoVar b</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1631" 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">
1631
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<pre style="margin: 0;">+<span id="LC1631" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> , let Pair tyL tyR = coercionKind co</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1632" 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">
1632
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<pre style="margin: 0;">+<span id="LC1632" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> , ASSERT( isForAllTy_co tyL )</span></span>
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1633
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<pre style="margin: 0;">+<span id="LC1633" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> isForAllTy_co tyR</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1634" 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">
1634
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<pre style="margin: 0;">+<span id="LC1634" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> , isReflCo (mkNthCo Nominal 0 co) -- See Note [collectBindersPushingCo]</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1635" 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">
1635
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<pre style="margin: 0;">+<span id="LC1635" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> , let cov = mkCoVarCo b</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1636" 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">
1636
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<pre style="margin: 0;">+<span id="LC1636" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = go_c (b:bs) e (mkInstCo co (mkNomReflCo (mkCoercionTy cov)))</span></span>
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1637
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<pre style="margin: 0;">+<span id="LC1637" class="line" lang="haskell"></span>
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1638
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<pre style="margin: 0;">+<span id="LC1638" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | isId b</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1639" 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">
1639
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<pre style="margin: 0;">+<span id="LC1639" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> , let Pair tyL tyR = coercionKind co</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1640" 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">
1640
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<pre style="margin: 0;">+<span id="LC1640" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> , ASSERT( isFunTy tyL) isFunTy tyR</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1641" 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">
1641
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<pre style="margin: 0;">+<span id="LC1641" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> , (co_mult, co_arg, co_res) <- decomposeFunCo Representational co</span></span>
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1642
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<pre style="margin: 0;">+<span id="LC1642" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> , isReflCo co_mult -- See Note [collectBindersPushingCo]</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1643" 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">
1643
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<pre style="margin: 0;">+<span id="LC1643" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> , isReflCo co_arg -- See Note [collectBindersPushingCo]</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1644" 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">
1644
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<pre style="margin: 0;">+<span id="LC1644" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = go_c (b:bs) e co_res</span></span>
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1645
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<pre style="margin: 0;">+<span id="LC1645" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1646" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | otherwise = (reverse bs, mkCast (Lam b e) co)</span></span>
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1647
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<pre style="margin: 0;"> <span id="LC1647" class="line" lang="haskell"></span>
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1648
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<pre style="margin: 0;">+<span id="LC1648" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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1268
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1649
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<pre style="margin: 0;"> <span id="LC1649" class="line" lang="haskell"></span>
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1269
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<pre style="margin: 0;">-<span id="LC1269" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--------------</span></span>
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1650
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<pre style="margin: 0;">+<span id="LC1650" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [collectBindersPushingCo]</span></span>
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1651
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<pre style="margin: 0;">+<span id="LC1651" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1652
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<pre style="margin: 0;">+<span id="LC1652" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We just look for coercions of form</span></span>
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1653
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<pre style="margin: 0;">+<span id="LC1653" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <type> # w -> blah</span></span>
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1654
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<pre style="margin: 0;">+<span id="LC1654" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(and similarly for foralls) to keep this function simple. We could do</span></span>
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1655
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<pre style="margin: 0;">+<span id="LC1655" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">more elaborate stuff, but it'd involve substitution etc.</span></span>
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1270
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1656
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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="cm" style="color: #998; font-style: italic;">-}</span></span>
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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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1659
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<pre style="margin: 0;">+<span id="LC1659" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *********************************************************************</span></span>
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1660
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<pre style="margin: 0;">+<span id="LC1660" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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1661
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<pre style="margin: 0;">+<span id="LC1661" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Join points</span></span>
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1662
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<pre style="margin: 0;">+<span id="LC1662" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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1663
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<pre style="margin: 0;">+<span id="LC1663" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">********************************************************************* -}</span></span>
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1664
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<pre style="margin: 0;">+<span id="LC1664" class="line" lang="haskell"></span>
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1665
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<pre style="margin: 0;">+<span id="LC1665" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-------------------</span></span>
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1271
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1666
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<pre style="margin: 0;"> <span id="LC1666" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- | Split an expression into the given number of binders and a body,</span></span>
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1272
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1667
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<pre style="margin: 0;"> <span id="LC1667" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- eta-expanding if necessary. Counts value *and* type binders.</span></span>
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1273
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1668
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<pre style="margin: 0;"> <span id="LC1668" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">etaExpandToJoinPoint :: JoinArity -> CoreExpr -> ([CoreBndr], CoreExpr)</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">@@ -1307,7 +1702,7 @@ etaBodyForJoinPoint need_args body</td>
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1307
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1702
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<pre style="margin: 0;"> <span id="LC1702" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = (reverse rev_bs, e)</span></span>
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1308
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1703
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<pre style="margin: 0;"> <span id="LC1703" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> go n ty subst rev_bs e</span></span>
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1309
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1704
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<pre style="margin: 0;"> <span id="LC1704" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | Just (tv, res_ty) <- splitForAllTy_maybe ty</span></span>
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1310
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<pre style="margin: 0;">-<span id="LC1310" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">subst'</span><span class="p">,</span> <span class="n" style="color: #333;">tv'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Type</span></span><span class="o" style="font-weight: 600;"><span class="idiff right">.</span></span><span class="n" style="color: #333;">substVarBndr</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tv</span></span>
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1705
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<pre style="margin: 0;">+<span id="LC1705" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> , let (subst', tv') = substVarBndr subst tv</span></span>
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1311
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1706
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<pre style="margin: 0;"> <span id="LC1706" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = go (n-1) res_ty subst' (tv' : rev_bs) (e `App` varToCoreExpr tv')</span></span>
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1312
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1707
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<pre style="margin: 0;"> <span id="LC1707" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | Just (mult, arg_ty, res_ty) <- splitFunTy_maybe ty</span></span>
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1313
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1708
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<pre style="margin: 0;"> <span id="LC1708" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> , let (subst', b) = freshEtaId n subst (Scaled mult arg_ty)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1318,6 +1713,8 @@ etaBodyForJoinPoint need_args body</td>
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1318
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1713
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<pre style="margin: 0;"> <span id="LC1713" class="line" lang="haskell"></span>
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1319
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<pre style="margin: 0;"> <span id="LC1714" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> init_subst e = mkEmptyTCvSubst (mkInScopeSet (exprFreeVars e))</span></span>
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1320
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1715
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<pre style="margin: 0;"> <span id="LC1715" class="line" lang="haskell"></span>
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1716
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<pre style="margin: 0;">+<span id="LC1716" class="line" lang="haskell"></span>
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1717
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<pre style="margin: 0;">+<span id="LC1717" class="line" lang="haskell"></span>
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1321
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1718
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<pre style="margin: 0;"> <span id="LC1718" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">--------------</span></span>
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1322
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1719
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<pre style="margin: 0;"> <span id="LC1719" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">freshEtaId :: Int -> TCvSubst -> Scaled Type -> (TCvSubst, Id)</span></span>
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1323
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1720
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<pre style="margin: 0;"> <span id="LC1720" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- Make a fresh Id, with specified type (after applying substitution)</span></span>
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<td class="diff-line-num unfold js-unfold 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">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1733" 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">@@ -1336,3 +1733,4 @@ freshEtaId n subst ty</td>
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1336
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1733
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<pre style="margin: 0;"> <span id="LC1733" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- "OrCoVar" since this can be used to eta-expand</span></span>
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1337
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1734
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<pre style="margin: 0;"> <span id="LC1734" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- coercion abstractions</span></span>
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1338
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1735
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<pre style="margin: 0;"> <span id="LC1735" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> subst' = extendTCvInScope subst eta_id'</span></span>
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1736
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<pre style="margin: 0;">+<span id="LC1736" class="line" lang="haskell"></span></pre>
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<li id="f168a93cde5e2aec2441d6331dfe500172df4af3">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/716b67d9b0ce485e2bfb6951b5f0586af642cad8#f168a93cde5e2aec2441d6331dfe500172df4af3"><strong>compiler/GHC/Core/Opt/Simplify.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">@@ -48,9 +48,9 @@ import GHC.Types.Unique ( hasKey )</td>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Unfold</span></span>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Utils</span></span>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Opt.Arity</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</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;">arityTypeArity</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isBotArityType</span></span>
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<pre style="margin: 0;">+<span id="LC51" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pushCoTyArg</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pushCoValArg</span></span>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">idArityType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">etaExpandAT</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC52" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.SimpleOpt</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">pushCoTyArg</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pushCoValArg</span></span>
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<pre style="margin: 0;">-<span id="LC53" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">joinPointBinding_maybe</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">joinPointBindings_maybe</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC53" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.SimpleOpt</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">joinPointBinding_maybe</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">joinPointBindings_maybe</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.FVs</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">mkRuleInfo</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Rules</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">lookupRule</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">getRules</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">initRuleOpts</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Basic</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">@@ -315,7 +315,7 @@ simplLazyBind env top_lvl is_rec bndr bndr1 rhs rhs_se</td>
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<pre style="margin: 0;"> <span id="LC315" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">rhs_cont</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkRhsStop</span> <span class="p">(</span><span class="n" style="color: #333;">substTy</span> <span class="n" style="color: #333;">body_env</span> <span class="p">(</span><span class="n" style="color: #333;">exprType</span> <span class="n" style="color: #333;">body</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC316" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">body_floats0</span><span class="p">,</span> <span class="n" style="color: #333;">body0</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="cp" style="color: #999; font-weight: 600;">{-#SCC "simplExprF" #-}</span> <span class="n" style="color: #333;">simplExprF</span> <span class="n" style="color: #333;">body_env</span> <span class="n" style="color: #333;">body</span> <span class="n" style="color: #333;">rhs_cont</span></span>
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<pre style="margin: 0;"> <span id="LC317" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC318" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Never float join-floats out of a non-join let-binding</span></span>
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<pre style="margin: 0;">+<span id="LC318" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Never float join-floats out of a non-join let-binding<span class="idiff left right"> (which this is)</span></span></span>
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<pre style="margin: 0;"> <span id="LC319" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- So wrap the body in the join-floats right now</span></span>
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<pre style="margin: 0;"> <span id="LC320" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Hence: body_floats1 consists only of let-floats</span></span>
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<pre style="margin: 0;"> <span id="LC321" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">body_floats1</span><span class="p">,</span> <span class="n" style="color: #333;">body1</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wrapJoinFloatsX</span> <span class="n" style="color: #333;">body_floats0</span> <span class="n" style="color: #333;">body0</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">@@ -385,7 +385,8 @@ simplNonRecX env bndr new_rhs</td>
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385
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<pre style="margin: 0;"> <span id="LC385" class="line" lang="haskell"></span>
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386
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<pre style="margin: 0;"> <span id="LC386" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;"> <span id="LC387" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">env'</span><span class="p">,</span> <span class="n" style="color: #333;">bndr'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">simplBinder</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">bndr</span></span>
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388
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<pre style="margin: 0;">-<span id="LC388" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">completeNonRecX</span> <span class="kt" style="color: #458; font-weight: 600;">NotTopLevel</span> <span class="n" style="color: #333;">env'</span> <span class="p">(</span><span class="n" style="color: #333;">isStrictId</span> <span class="n" style="color: #333;">bndr</span><span class="p">)</span> <span class="n" style="color: #333;">bndr</span> <span class="n" style="color: #333;">bndr'</span> <span class="n" style="color: #333;">new_rhs</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC388" class="line" lang="haskell"> <span class="p">;</span> <span class="c1" style="color: #998; font-style: italic;">-- pprTrace "simplNonRecX" (ppr bndr <+> ppr bndr' $$ ppr (idOccInfo bndr) $$ ppr new_rhs) $</span></span>
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<pre style="margin: 0;">+<span id="LC389" class="line" lang="haskell"> <span class="n" style="color: #333;">completeNonRecX</span> <span class="kt" style="color: #458; font-weight: 600;">NotTopLevel</span> <span class="n" style="color: #333;">env'</span> <span class="p">(</span><span class="n" style="color: #333;">isStrictId</span> <span class="n" style="color: #333;">bndr</span><span class="p">)</span> <span class="n" style="color: #333;">bndr</span> <span class="n" style="color: #333;">bndr'</span> <span class="n" style="color: #333;">new_rhs</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC390" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- simplNonRecX is only used for NotTopLevel things</span></span>
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391
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<pre style="margin: 0;"> <span id="LC391" class="line" lang="haskell"></span>
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392
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<pre style="margin: 0;"> <span id="LC392" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--------------------------</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="601" 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">@@ -600,7 +601,8 @@ prepareRhs mode top_lvl occ rhs0</td>
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600
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601
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<pre style="margin: 0;"> <span id="LC601" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">is_exp</span><span class="p">,</span> <span class="n" style="color: #333;">floats1</span><span class="p">,</span> <span class="n" style="color: #333;">fun'</span><span class="p">)</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;">n_val_args</span><span class="o" style="font-weight: 600;">+</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="n" style="color: #333;">fun</span></span>
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601
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602
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<pre style="margin: 0;"> <span id="LC602" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">is_exp</span> <span class="kr" style="font-weight: 600;">of</span></span>
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602
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603
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<pre style="margin: 0;"> <span id="LC603" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">,</span> <span class="n" style="color: #333;">emptyLetFloats</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">App</span> <span class="n" style="color: #333;">fun</span> <span class="n" style="color: #333;">arg</span><span class="p">)</span></span>
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603
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<pre style="margin: 0;">-<span id="LC603" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">floats2</span><span class="p">,</span> <span class="n" style="color: #333;">arg'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">makeTrivial</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">top_lvl</span> <span class="n" style="color: #333;">topDmd</span> <span class="n" style="color: #333;">occ</span> <span class="n" style="color: #333;">arg</span></span>
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604
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<pre style="margin: 0;">+<span id="LC604" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">floats2</span><span class="p">,</span> <span class="n" style="color: #333;">arg'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="c1" style="color: #998; font-style: italic;">-- pprTrace "prepareRhs" (ppr occ <+> ppr rhs0) $</span></span>
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605
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<pre style="margin: 0;">+<span id="LC605" class="line" lang="haskell"> <span class="n" style="color: #333;">makeTrivial</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">top_lvl</span> <span class="n" style="color: #333;">topDmd</span> <span class="n" style="color: #333;">occ</span> <span class="n" style="color: #333;">arg</span></span>
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604
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606
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<pre style="margin: 0;"> <span id="LC606" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">,</span> <span class="n" style="color: #333;">floats1</span> <span class="p">`</span><span class="n" style="color: #333;">addLetFlts</span><span class="p">`</span> <span class="n" style="color: #333;">floats2</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">App</span> <span class="n" style="color: #333;">fun'</span> <span class="n" style="color: #333;">arg'</span><span class="p">)</span> <span class="p">}</span> <span class="p">}</span></span>
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605
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607
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<pre style="margin: 0;"> <span id="LC607" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n_val_args</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">fun</span><span class="p">)</span></span>
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606
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608
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<pre style="margin: 0;"> <span id="LC608" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">is_exp</span><span class="p">,</span> <span class="n" style="color: #333;">emptyLetFloats</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">fun</span><span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="680" 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="682" 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">@@ -680,7 +682,8 @@ makeTrivialBinding mode top_lvl occ_fs info expr expr_ty</td>
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<pre style="margin: 0;"> <span id="LC682" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">final_id</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addLetBndrInfo</span> <span class="n" style="color: #333;">var</span> <span class="n" style="color: #333;">arity_type</span> <span class="n" style="color: #333;">unf</span></span>
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<pre style="margin: 0;"> <span id="LC683" class="line" lang="haskell"> <span class="n" style="color: #333;">bind</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NonRec</span> <span class="n" style="color: #333;">final_id</span> <span class="n" style="color: #333;">expr2</span></span>
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684
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<pre style="margin: 0;"> <span id="LC684" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC683" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span> <span class="n" style="color: #333;">floats</span> <span class="p">`</span><span class="n" style="color: #333;">addLetFlts</span><span class="p">`</span> <span class="n" style="color: #333;">unitLetFloat</span> <span class="n" style="color: #333;">bind</span><span class="p">,</span> <span class="n" style="color: #333;">final_id</span> <span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC685" class="line" lang="haskell"> <span class="p">;</span> <span class="c1" style="color: #998; font-style: italic;">-- pprTrace "makeTrivial" (ppr bind) $</span></span>
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<pre style="margin: 0;">+<span id="LC686" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span> <span class="n" style="color: #333;">floats</span> <span class="p">`</span><span class="n" style="color: #333;">addLetFlts</span><span class="p">`</span> <span class="n" style="color: #333;">unitLetFloat</span> <span class="n" style="color: #333;">bind</span><span class="p">,</span> <span class="n" style="color: #333;">final_id</span> <span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC687" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC688" class="line" lang="haskell"><span class="n" style="color: #333;">bindingOk</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TopLevelFlag</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</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;">Bool</span></span>
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<pre style="margin: 0;"> <span id="LC689" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- True iff we can have a binding of this expression at this level</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">@@ -1411,25 +1414,23 @@ simplCast env body co0 cont0</td>
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<pre style="margin: 0;"> <span id="LC1414" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- type of the hole changes (#16312)</span></span>
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<pre style="margin: 0;"> <span id="LC1415" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1416" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (f |> co) e ===> (f (e |> co1)) |> co2</span></span>
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<pre style="margin: 0;">-<span id="LC1414" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- where co :: (s1->s2) ~ (t1<span class="idiff left right">~</span>t2)</span></span>
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<pre style="margin: 0;">+<span id="LC1417" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- where co :: (s1->s2) ~ (t1<span class="idiff left right">-></span>t2)</span></span>
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<pre style="margin: 0;"> <span id="LC1418" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- co1 :: t1 ~ s1</span></span>
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<pre style="margin: 0;"> <span id="LC1419" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- co2 :: s2 ~ t2</span></span>
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<pre style="margin: 0;"> <span id="LC1420" class="line" lang="haskell"> <span class="n" style="color: #333;">addCoerce</span> <span class="n" style="color: #333;">co</span> <span class="n" style="color: #333;">cont</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ApplyToVal</span> <span class="p">{</span> <span class="n" style="color: #333;">sc_arg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">arg</span><span class="p">,</span> <span class="n" style="color: #333;">sc_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">arg_se</span></span>
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<pre style="margin: 0;"> <span id="LC1421" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">sc_dup</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dup</span><span class="p">,</span> <span class="n" style="color: #333;">sc_cont</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tail</span> <span class="p">})</span></span>
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<pre style="margin: 0;">-<span id="LC1419" 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;">co1</span><span class="p">,</span> <span class="n" style="color: #333;">m_co2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pushCoValArg</span> <span class="n" style="color: #333;">co</span></span>
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1420
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<pre style="margin: 0;">-<span id="LC1420" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">new_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">coercionRKind</span> <span class="n" style="color: #333;">co1</span></span>
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<pre style="margin: 0;">-<span id="LC1421" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isTypeLevPoly</span> <span class="n" style="color: #333;">new_ty</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Without this check, we get a lev-poly arg</span></span>
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<pre style="margin: 0;">-<span id="LC1422" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Levity polymorphism invariants] in GHC.Core</span></span>
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<pre style="margin: 0;">-<span id="LC1423" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- test: typecheck/should_run/EtaExpandLevPoly</span></span>
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<pre style="margin: 0;">+<span id="LC1422" 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;">m_co1</span><span class="p">,</span> <span class="n" style="color: #333;">m_co2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pushCoValArg</span> <span class="n" style="color: #333;">co</span></span>
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<pre style="margin: 0;">+<span id="LC1423" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">levity_ok</span> <span class="n" style="color: #333;">m_co1</span></span>
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<pre style="margin: 0;"> <span id="LC1424" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="cp" style="color: #999; font-weight: 600;">{-#SCC "addCoerce-pushCoValArg" #-}</span></span>
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1425
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1425
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<pre style="margin: 0;"> <span id="LC1425" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">tail'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addCoerceM</span> <span class="n" style="color: #333;">m_co2</span> <span class="n" style="color: #333;">tail</span></span>
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1426
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<pre style="margin: 0;">-<span id="LC1426" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">if</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">isReflCo</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">co1</span></span></span>
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<pre style="margin: 0;">-<span id="LC1427" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;"><span class="idiff left right">then</span></span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">cont</span> <span class="p">{</span> <span class="n" style="color: #333;">sc_cont</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tail'</span></span>
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<pre style="margin: 0;">-<span id="LC1428" class="line" lang="haskell"> <span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">sc_hole_ty</span></span><span class="idiff"> </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">coercionLKind</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">co</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">})</span></span></span>
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<pre style="margin: 0;">+<span id="LC1426" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">case</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">m_co1</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">of</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">{</span></span></span>
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<pre style="margin: 0;">+<span id="LC1427" class="line" lang="haskell"> <span class="idiff left"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">MRefl</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">-></span></span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">cont</span> <span class="p">{</span> <span class="n" style="color: #333;">sc_cont</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tail'</span></span>
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<pre style="margin: 0;">+<span id="LC1428" class="line" lang="haskell"> <span class="idiff left"> </span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">sc_hole_ty</span></span><span class="idiff"> </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">coercionLKind</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">co</span></span><span class="idiff"> </span><span class="p"><span class="idiff">})</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">;</span></span></span>
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<pre style="margin: 0;"> <span id="LC1429" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Avoid simplifying if possible;</span></span>
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<pre style="margin: 0;"> <span id="LC1430" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Avoiding exponential behaviour]</span></span>
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<pre style="margin: 0;">-<span id="LC1431" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">-<span id="LC1432" class="line" lang="haskell"> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">dup'</span><span class="p">,</span> <span class="n" style="color: #333;">arg_se'</span><span class="p">,</span> <span class="n" style="color: #333;">arg'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">simplArg</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">dup</span> <span class="n" style="color: #333;">arg_se</span> <span class="n" style="color: #333;">arg</span></span>
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<pre style="margin: 0;">+<span id="LC1431" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1432" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MCo</span> <span class="n" style="color: #333;">co1</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC1433" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">dup'</span><span class="p">,</span> <span class="n" style="color: #333;">arg_se'</span><span class="p">,</span> <span class="n" style="color: #333;">arg'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">simplArg</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">dup</span> <span class="n" style="color: #333;">arg_se</span> <span class="n" style="color: #333;">arg</span></span>
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<pre style="margin: 0;"> <span id="LC1434" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- When we build the ApplyTo we can't mix the OutCoercion</span></span>
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1435
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<pre style="margin: 0;"> <span id="LC1435" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 'co' with the InExpr 'arg', so we simplify</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;">-- to make it all consistent. It's a bit messy.</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">@@ -1439,7 +1440,7 @@ simplCast env body co0 cont0</td>
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1439
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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;">sc_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">arg_se'</span></span>
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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="n" style="color: #333;">sc_dup</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dup'</span></span>
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1442
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<pre style="margin: 0;"> <span id="LC1442" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">sc_cont</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tail'</span></span>
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<pre style="margin: 0;">-<span id="LC1442" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">sc_hole_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">coercionLKind</span> <span class="n" style="color: #333;">co</span> <span class="p">})</span> <span class="p">}</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1443" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">sc_hole_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">coercionLKind</span> <span class="n" style="color: #333;">co</span> <span class="p">})</span> <span class="p">}</span> <span class="p">}</span><span class="idiff left"> </span><span class="p"><span class="idiff right">}</span></span></span>
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1444
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<pre style="margin: 0;"> <span id="LC1444" class="line" lang="haskell"></span>
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1445
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<pre style="margin: 0;"> <span id="LC1445" class="line" lang="haskell"> <span class="n" style="color: #333;">addCoerce</span> <span class="n" style="color: #333;">co</span> <span class="n" style="color: #333;">cont</span></span>
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1446
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<pre style="margin: 0;"> <span id="LC1446" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isReflexiveCo</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">cont</span> <span class="c1" style="color: #998; font-style: italic;">-- Having this at the end makes a huge</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">@@ -1447,6 +1448,13 @@ simplCast env body co0 cont0</td>
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1447
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1448
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<pre style="margin: 0;"> <span id="LC1448" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Optimising reflexivity]</span></span>
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1449
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<pre style="margin: 0;"> <span id="LC1449" 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;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CastIt</span> <span class="n" style="color: #333;">co</span> <span class="n" style="color: #333;">cont</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>
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<pre style="margin: 0;">+<span id="LC1451" class="line" lang="haskell"> <span class="n" style="color: #333;">levity_ok</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">MCoercionR</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC1452" class="line" lang="haskell"> <span class="n" style="color: #333;">levity_ok</span> <span class="kt" style="color: #458; font-weight: 600;">MRefl</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">+<span id="LC1453" class="line" lang="haskell"> <span class="n" style="color: #333;">levity_ok</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;">not</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">isTypeLevPoly</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">coercionRKind</span> <span class="n" style="color: #333;">co</span></span>
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<pre style="margin: 0;">+<span id="LC1454" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Without this check, we get a lev-poly arg</span></span>
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<pre style="margin: 0;">+<span id="LC1455" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Levity polymorphism invariants] in GHC.Core</span></span>
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<pre style="margin: 0;">+<span id="LC1456" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- test: typecheck/should_run/EtaExpandLevPoly</span></span>
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1457
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<pre style="margin: 0;">+<span id="LC1457" class="line" lang="haskell"></span>
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1450
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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;">simplArg</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SimplEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DupFlag</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StaticEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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1451
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1459
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<pre style="margin: 0;"> <span id="LC1459" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SimplM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DupFlag</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">StaticEnv</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">OutExpr</span><span class="p">)</span></span>
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1452
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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;">simplArg</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">dup_flag</span> <span class="n" style="color: #333;">arg_env</span> <span class="n" style="color: #333;">arg</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="3119" 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">@@ -3111,7 +3119,7 @@ knownCon :: SimplEnv</td>
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3111
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3119
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<pre style="margin: 0;"> <span id="LC3119" class="line" lang="haskell"></span>
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3112
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3120
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<pre style="margin: 0;"> <span id="LC3120" class="line" lang="haskell"><span class="n" style="color: #333;">knownCon</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">scrut</span> <span class="n" style="color: #333;">dc_floats</span> <span class="n" style="color: #333;">dc</span> <span class="n" style="color: #333;">dc_ty_args</span> <span class="n" style="color: #333;">dc_args</span> <span class="n" style="color: #333;">bndr</span> <span class="n" style="color: #333;">bs</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">cont</span></span>
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3113
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3121
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<pre style="margin: 0;"> <span id="LC3121" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">floats1</span><span class="p">,</span> <span class="n" style="color: #333;">env1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">bind_args</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">bs</span> <span class="n" style="color: #333;">dc_args</span></span>
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3114
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<pre style="margin: 0;">-<span id="LC3114" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">floats2</span><span class="p">,</span> <span class="n" style="color: #333;">env2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">bind_case_bndr</span> <span class="n" style="color: #333;">env1</span></span>
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3122
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<pre style="margin: 0;">+<span id="LC3122" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">floats2</span><span class="p">,</span> <span class="n" style="color: #333;">env2</span><span class="p">)</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">bind_case_bndr</span> <span class="n" style="color: #333;">env1</span></span>
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3115
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3123
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<pre style="margin: 0;"> <span id="LC3123" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">floats3</span><span class="p">,</span> <span class="n" style="color: #333;">expr'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">simplExprF</span> <span class="n" style="color: #333;">env2</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">cont</span></span>
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3116
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3124
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<pre style="margin: 0;"> <span id="LC3124" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">dc_floats</span> <span class="kr" style="font-weight: 600;">of</span></span>
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3117
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3125
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<pre style="margin: 0;"> <span id="LC3125" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">-></span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="3143" 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="3151" 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">@@ -3143,8 +3151,9 @@ knownCon env scrut dc_floats dc dc_ty_args dc_args bndr bs rhs cont</td>
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3143
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3151
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<pre style="margin: 0;"> <span id="LC3151" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- it via postInlineUnconditionally.</span></span>
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3144
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3152
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<pre style="margin: 0;"> <span id="LC3152" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Nevertheless we must keep it if the case-binder is alive,</span></span>
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3145
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3153
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<pre style="margin: 0;"> <span id="LC3153" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- because it may be used in the con_app. See Note [knownCon occ info]</span></span>
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3146
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<pre style="margin: 0;">-<span id="LC3146" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">floats1</span><span class="p">,</span> <span class="n" style="color: #333;">env2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">simplNonRecX</span> <span class="n" style="color: #333;">env'</span> <span class="n" style="color: #333;">b'</span> <span class="n" style="color: #333;">arg</span> <span class="c1" style="color: #998; font-style: italic;">-- arg satisfies let/app invariant</span></span>
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3147
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<pre style="margin: 0;">-<span id="LC3147" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">floats2</span><span class="p">,</span> <span class="n" style="color: #333;">env3</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">bind_args</span> <span class="n" style="color: #333;">env2</span> <span class="n" style="color: #333;">bs'</span> <span class="n" style="color: #333;">args</span></span>
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<td class="diff-line-num new old_line" data-linenumber="3148" 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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3154
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<pre style="margin: 0;">+<span id="LC3154" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">floats1</span><span class="p">,</span> <span class="n" style="color: #333;">env2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="c1" style="color: #998; font-style: italic;">-- pprTrace "knownCon" (vcat [ pprBndr CasePatBind b, pprBndr CasePatBind b', ppr arg ]) $</span></span>
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<pre style="margin: 0;">+<span id="LC3155" class="line" lang="haskell"> <span class="n" style="color: #333;">simplNonRecX</span> <span class="n" style="color: #333;">env'</span> <span class="n" style="color: #333;">b'</span> <span class="n" style="color: #333;">arg</span> <span class="c1" style="color: #998; font-style: italic;">-- arg satisfies let/app invariant</span></span>
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3156
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<pre style="margin: 0;">+<span id="LC3156" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">floats2</span><span class="p">,</span> <span class="n" style="color: #333;">env3</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">bind_args</span> <span class="n" style="color: #333;">env2</span> <span class="n" style="color: #333;">bs'</span> <span class="n" style="color: #333;">args</span></span>
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3148
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3157
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<pre style="margin: 0;"> <span id="LC3157" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">floats1</span> <span class="p">`</span><span class="n" style="color: #333;">addFloats</span><span class="p">`</span> <span class="n" style="color: #333;">floats2</span><span class="p">,</span> <span class="n" style="color: #333;">env3</span><span class="p">)</span> <span class="p">}</span></span>
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3149
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3158
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<pre style="margin: 0;"> <span id="LC3158" class="line" lang="haskell"></span>
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3150
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3159
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<pre style="margin: 0;"> <span id="LC3159" class="line" lang="haskell"> <span class="n" style="color: #333;">bind_args</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>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="3237" 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="3246" 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">@@ -3237,6 +3246,7 @@ altsWouldDup [_] = False</td>
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3237
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3246
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<pre style="margin: 0;"> <span id="LC3246" class="line" lang="haskell"><span class="n" style="color: #333;">altsWouldDup</span> <span class="p">(</span><span class="n" style="color: #333;">alt</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">alts</span><span class="p">)</span></span>
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3238
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3247
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<pre style="margin: 0;"> <span id="LC3247" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">is_bot_alt</span> <span class="n" style="color: #333;">alt</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">altsWouldDup</span> <span class="n" style="color: #333;">alts</span></span>
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3239
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3248
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<pre style="margin: 0;"> <span id="LC3248" 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;">not</span> <span class="p">(</span><span class="n" style="color: #333;">all</span> <span class="n" style="color: #333;">is_bot_alt</span> <span class="n" style="color: #333;">alts</span><span class="p">)</span></span>
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3249
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<pre style="margin: 0;">+<span id="LC3249" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- otherwise case: first alt is non-bot, so all the rest must be bot</span></span>
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3240
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3250
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<pre style="margin: 0;"> <span id="LC3250" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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3241
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3251
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<pre style="margin: 0;"> <span id="LC3251" class="line" lang="haskell"> <span class="n" style="color: #333;">is_bot_alt</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span><span class="n" style="color: #333;">rhs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">exprIsDeadEnd</span> <span class="n" style="color: #333;">rhs</span></span>
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3242
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3252
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<pre style="margin: 0;"> <span id="LC3252" 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">@@ -3824,7 +3834,8 @@ simplStableUnfolding env top_lvl mb_cont id rhs_ty id_arity unf</td>
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3824
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3834
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<pre style="margin: 0;"> <span id="LC3834" class="line" lang="haskell"> <span class="n" style="color: #333;">simplJoinRhs</span> <span class="n" style="color: #333;">unf_env</span> <span class="n" style="color: #333;">id</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">cont</span></span>
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3825
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3835
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<pre style="margin: 0;"> <span id="LC3835" 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="c1" style="color: #998; font-style: italic;">-- Binder is not a join point</span></span>
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3826
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3836
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<pre style="margin: 0;"> <span id="LC3836" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">expr'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">simplExprC</span> <span class="n" style="color: #333;">unf_env</span> <span class="n" style="color: #333;">expr</span> <span class="p">(</span><span class="n" style="color: #333;">mkBoringStop</span> <span class="n" style="color: #333;">rhs_ty</span><span class="p">)</span></span>
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3827
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<pre style="margin: 0;">-<span id="LC3827" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">eta_expand</span> <span class="n" style="color: #333;">expr'</span><span class="p">)</span> <span class="p">}</span></span>
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3837
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<pre style="margin: 0;">+<span id="LC3837" class="line" lang="haskell"> <span class="p">;</span> <span class="c1" style="color: #998; font-style: italic;">-- pprTrace "ssu" (ppr expr $$ ppr expr' $$ ppr (eta_expand expr')) $</span></span>
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3838
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<pre style="margin: 0;">+<span id="LC3838" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">eta_expand</span> <span class="n" style="color: #333;">expr'</span><span class="p">)</span> <span class="p">}</span></span>
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3828
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3839
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<pre style="margin: 0;"> <span id="LC3839" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">guide</span> <span class="kr" style="font-weight: 600;">of</span></span>
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3829
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<pre style="margin: 0;"> <span id="LC3840" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">UnfWhen</span> <span class="p">{</span> <span class="n" style="color: #333;">ug_arity</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">arity</span></span>
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<pre style="margin: 0;"> <span id="LC3841" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ug_unsat_ok</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sat_ok</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/716b67d9b0ce485e2bfb6951b5f0586af642cad8#2f46b19cb85e3f7b4e72305644bc50015628c41d"><strong>compiler/GHC/Core/Opt/Simplify/Env.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">@@ -591,7 +591,7 @@ addJoinFlts :: JoinFloats -> JoinFloats -> JoinFloats</td>
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<pre style="margin: 0;"> <span id="LC591" class="line" lang="haskell"><span class="n" style="color: #333;">addJoinFlts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">appOL</span></span>
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<pre style="margin: 0;"> <span id="LC592" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC593" class="line" lang="haskell"><span class="n" style="color: #333;">mkRecFloats</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SimplFloats</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SimplFloats</span></span>
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<pre style="margin: 0;">-<span id="LC594" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Flattens the floats <span class="idiff left right">from env2 </span>into a single Rec group,</span></span>
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<pre style="margin: 0;">+<span id="LC594" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Flattens the floats into a single Rec group,</span></span>
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<pre style="margin: 0;"> <span id="LC595" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- They must either all be lifted LetFloats or all JoinFloats</span></span>
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<pre style="margin: 0;"> <span id="LC596" class="line" lang="haskell"><span class="n" style="color: #333;">mkRecFloats</span> <span class="n" style="color: #333;">floats</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SimplFloats</span> <span class="p">{</span> <span class="n" style="color: #333;">sfLetFloats</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">LetFloats</span> <span class="n" style="color: #333;">bs</span> <span class="n" style="color: #333;">ff</span></span>
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<pre style="margin: 0;"> <span id="LC597" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">sfJoinFloats</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">jbs</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/716b67d9b0ce485e2bfb6951b5f0586af642cad8#ab22d7ae4d245581b701367e386d7e886e416e76"><strong>compiler/GHC/Core/Opt/Specialise.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">@@ -21,7 +21,7 @@ import GHC.Tc.Utils.TcType hiding( substTy )</td>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Type</span> <span class="n" style="color: #333;">hiding</span><span class="p">(</span> <span class="n" style="color: #333;">substTy</span><span class="p">,</span> <span class="n" style="color: #333;">extendTvSubstList</span> <span class="p">)</span></span>
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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;">GHC.Core.Multiplicity</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;">GHC.Core.Predicate</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;">GHC.Unit.Module</span><span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Module</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">HasModule</span></span><span class="p"><span class="idiff">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">..</span></span><span class="p"><span class="idiff right">)</span></span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Unit.Module</span><span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Module</span> <span class="p">)</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;">GHC.Core.Coercion</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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<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;">GHC.Core.Opt.Monad</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="k" style="font-weight: 600;">qualified</span> <span class="nn" style="color: #555;">GHC.Core.Subst</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">Core</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">@@ -31,11 +31,11 @@ import GHC.Types.Var.Set</td>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var.Env</span></span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core</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;">GHC.Core.Rules</span></span>
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<pre style="margin: 0;">-<span id="LC34" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.SimpleOpt</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">collectBindersPushingCo</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Utils</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">exprIsTrivial</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">getIdFromTrivialExpr_maybe</span></span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkCast</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">exprType</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.FVs</span></span>
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<pre style="margin: 0;">-<span id="LC38" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Opt.Arity</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">etaExpandToJoinPointRule</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Opt.Arity</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">collectBindersPushingCo</span></span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">etaExpandToJoinPointRule</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Unique.Supply</span></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Name</span></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Id.Make</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">voidArgId</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">voidPrimId</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">@@ -51,12 +51,9 @@ import GHC.Utils.Misc</td>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Outputable</span></span>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Panic</span></span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.FastString</span></span>
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<pre style="margin: 0;">-<span id="LC54" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Monad.State</span></span>
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Unique.DFM</span></span>
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCo.Rep</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyCoBinder</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="LC56" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC58" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Monad</span></span>
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<pre style="margin: 0;">-<span id="LC59" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC57" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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58
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<pre style="margin: 0;"> <span id="LC58" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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59
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<pre style="margin: 0;"> <span id="LC59" 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">@@ -590,28 +587,29 @@ specProgram guts@(ModGuts { mg_module = this_mod</td>
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590
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587
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<pre style="margin: 0;"> <span id="LC587" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">mg_binds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">binds</span> <span class="p">})</span></span>
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591
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588
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<pre style="margin: 0;"> <span id="LC588" 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;">dflags</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getDynFlags</span></span>
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592
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589
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<pre style="margin: 0;"> <span id="LC589" class="line" lang="haskell"></span>
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590
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<pre style="margin: 0;">+<span id="LC590" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We need to start with a Subst that knows all the things</span></span>
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591
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<pre style="margin: 0;">+<span id="LC591" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- that are in scope, so that the substitution engine doesn't</span></span>
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592
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<pre style="margin: 0;">+<span id="LC592" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- accidentally re-use a unique that's already in use</span></span>
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593
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<pre style="margin: 0;">+<span id="LC593" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Easiest thing is to do it all at once, as if all the top-level</span></span>
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594
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<pre style="margin: 0;">+<span id="LC594" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- decls were mutually recursive</span></span>
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595
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<pre style="margin: 0;">+<span id="LC595" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">top_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SE</span> <span class="p">{</span> <span class="n" style="color: #333;">se_subst</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Core</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">mkEmptySubst</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkInScopeSet</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkVarSet</span> <span class="o" style="font-weight: 600;">$</span></span>
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596
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<pre style="margin: 0;">+<span id="LC596" class="line" lang="haskell"> <span class="n" style="color: #333;">bindersOfBinds</span> <span class="n" style="color: #333;">binds</span></span>
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597
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<pre style="margin: 0;">+<span id="LC597" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">se_interesting</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="LC598" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">se_module</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">this_mod</span></span>
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<pre style="margin: 0;">+<span id="LC599" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">se_dflags</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dflags</span> <span class="p">}</span></span>
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600
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<pre style="margin: 0;">+<span id="LC600" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC601" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span> <span class="n" style="color: #333;">emptyUDs</span><span class="p">)</span></span>
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602
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<pre style="margin: 0;">+<span id="LC602" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="n" style="color: #333;">bind</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">binds</span><span class="p">)</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;">binds'</span><span class="p">,</span> <span class="n" style="color: #333;">uds</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;">binds</span></span>
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603
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<pre style="margin: 0;">+<span id="LC603" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">bind'</span><span class="p">,</span> <span class="n" style="color: #333;">uds'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">specBind</span> <span class="n" style="color: #333;">top_env</span> <span class="n" style="color: #333;">bind</span> <span class="n" style="color: #333;">uds</span></span>
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604
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<pre style="margin: 0;">+<span id="LC604" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">bind'</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">binds'</span><span class="p">,</span> <span class="n" style="color: #333;">uds'</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC605" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC606" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Specialise the bindings of this module</span></span>
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<pre style="margin: 0;">-<span id="LC594" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">binds'</span><span class="p">,</span> <span class="n" style="color: #333;">uds</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">runSpecM</span> <span class="n" style="color: #333;"><span class="idiff left">dflags</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">this_mod</span></span><span class="idiff right"> </span><span class="p">(</span><span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">binds</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC607" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">binds'</span><span class="p">,</span> <span class="n" style="color: #333;">uds</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">runSpecM</span> <span class="p">(</span><span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">binds</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC608" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC596" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">spec_rules</span><span class="p">,</span> <span class="n" style="color: #333;">spec_binds</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">specImports</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">this_mod</span> <span class="n" style="color: #333;">top_env</span></span>
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<pre style="margin: 0;">-<span id="LC597" class="line" lang="haskell"> <span class="n" style="color: #333;">local_rules</span> <span class="n" style="color: #333;">uds</span></span>
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<pre style="margin: 0;">+<span id="LC609" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">spec_rules</span><span class="p">,</span> <span class="n" style="color: #333;">spec_binds</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">specImports</span> <span class="n" style="color: #333;">top_env</span> <span class="n" style="color: #333;">local_rules</span> <span class="n" style="color: #333;">uds</span></span>
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<pre style="margin: 0;"> <span id="LC610" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC611" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">guts</span> <span class="p">{</span> <span class="n" style="color: #333;">mg_binds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">spec_binds</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">binds'</span></span>
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<pre style="margin: 0;"> <span id="LC612" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">mg_rules</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">spec_rules</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">local_rules</span> <span class="p">})</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC601" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC602" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We need to start with a Subst that knows all the things</span></span>
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<pre style="margin: 0;">-<span id="LC603" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- that are in scope, so that the substitution engine doesn't</span></span>
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<pre style="margin: 0;">-<span id="LC604" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- accidentally re-use a unique that's already in use</span></span>
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<pre style="margin: 0;">-<span id="LC605" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Easiest thing is to do it all at once, as if all the top-level</span></span>
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<pre style="margin: 0;">-<span id="LC606" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- decls were mutually recursive</span></span>
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<pre style="margin: 0;">-<span id="LC607" class="line" lang="haskell"> <span class="n" style="color: #333;">top_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SE</span> <span class="p">{</span> <span class="n" style="color: #333;">se_subst</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Core</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">mkEmptySubst</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkInScopeSet</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkVarSet</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC608" class="line" lang="haskell"> <span class="n" style="color: #333;">bindersOfBinds</span> <span class="n" style="color: #333;">binds</span></span>
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609
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<pre style="margin: 0;">-<span id="LC609" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">se_interesting</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyVarSet</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC610" class="line" lang="haskell"></span>
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611
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<pre style="margin: 0;">-<span id="LC611" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span> <span class="n" style="color: #333;">emptyUDs</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC612" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="n" style="color: #333;">bind</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">binds</span><span class="p">)</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;">binds'</span><span class="p">,</span> <span class="n" style="color: #333;">uds</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;">binds</span></span>
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<pre style="margin: 0;">-<span id="LC613" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">bind'</span><span class="p">,</span> <span class="n" style="color: #333;">uds'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">specBind</span> <span class="n" style="color: #333;">top_env</span> <span class="n" style="color: #333;">bind</span> <span class="n" style="color: #333;">uds</span></span>
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<pre style="margin: 0;">-<span id="LC614" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">bind'</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">binds'</span><span class="p">,</span> <span class="n" style="color: #333;">uds'</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC613" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC614" 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="LC615" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Wrap bindings returned by specImports]</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">@@ -641,13 +639,13 @@ See #10491</td>
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<pre style="margin: 0;"> <span id="LC639" 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="LC640" 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="LC641" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC644" class="line" lang="haskell"><span class="n" style="color: #333;">specImports</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">DynFlags</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Module</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="kt" style="color: #458; font-weight: 600;">SpecEnv</span></span>
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<pre style="margin: 0;">+<span id="LC642" class="line" lang="haskell"><span class="n" style="color: #333;">specImports</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SpecEnv</span></span>
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<pre style="margin: 0;"> <span id="LC643" 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;">CoreRule</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC644" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">UsageDetails</span></span>
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<pre style="margin: 0;"> <span id="LC645" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreM</span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">CoreRule</span><span class="p">],</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoreBind</span><span class="p">])</span></span>
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<pre style="margin: 0;">-<span id="LC648" class="line" lang="haskell"><span class="n" style="color: #333;">specImports</span> <span class="n" style="color: #333;"><span class="idiff left">dflags</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">this_mod</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">top_env</span> <span class="n" style="color: #333;">local_rules</span></span>
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<pre style="margin: 0;">+<span id="LC646" class="line" lang="haskell"><span class="n" style="color: #333;">specImports</span> <span class="n" style="color: #333;">top_env</span> <span class="n" style="color: #333;">local_rules</span></span>
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<pre style="margin: 0;"> <span id="LC647" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MkUD</span> <span class="p">{</span> <span class="n" style="color: #333;">ud_binds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dict_binds</span><span class="p">,</span> <span class="n" style="color: #333;">ud_calls</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">calls</span> <span class="p">})</span></span>
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<pre style="margin: 0;">-<span id="LC650" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not</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_CrossModuleSpecialise</span> <span class="n" style="color: #333;"><span class="idiff left right">dflags</span></span></span>
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<pre style="margin: 0;">+<span id="LC648" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not</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_CrossModuleSpecialise</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">se_dflags</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">top_env</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;"> <span id="LC649" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Disabling cross-module specialisation]</span></span>
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<pre style="margin: 0;"> <span id="LC650" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span> <span class="n" style="color: #333;">wrapDictBinds</span> <span class="n" style="color: #333;">dict_binds</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC651" 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">@@ -655,8 +653,7 @@ specImports dflags this_mod top_env local_rules</td>
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<pre style="margin: 0;"> <span id="LC653" 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;">hpt_rules</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getRuleBase</span></span>
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<pre style="margin: 0;"> <span id="LC654" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">rule_base</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendRuleBaseList</span> <span class="n" style="color: #333;">hpt_rules</span> <span class="n" style="color: #333;">local_rules</span></span>
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<pre style="margin: 0;"> <span id="LC655" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC658" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">spec_rules</span><span class="p">,</span> <span class="n" style="color: #333;">spec_binds</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">spec_imports</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">this_mod</span> <span class="n" style="color: #333;">top_env</span></span>
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<pre style="margin: 0;">-<span id="LC659" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">rule_base</span></span>
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<pre style="margin: 0;">+<span id="LC656" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">spec_rules</span><span class="p">,</span> <span class="n" style="color: #333;">spec_binds</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">spec_imports</span> <span class="n" style="color: #333;">top_env</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">rule_base</span></span>
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<pre style="margin: 0;"> <span id="LC657" class="line" lang="haskell"> <span class="n" style="color: #333;">dict_binds</span> <span class="n" style="color: #333;">calls</span></span>
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<pre style="margin: 0;"> <span id="LC658" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC659" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Don't forget to wrap the specialized bindings with</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">@@ -672,9 +669,7 @@ specImports dflags this_mod top_env local_rules</td>
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<pre style="margin: 0;"> <span id="LC669" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC670" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC671" class="line" lang="haskell"><span class="cd">-- | Specialise a set of calls to imported bindings</span></span>
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<pre style="margin: 0;">-<span id="LC675" class="line" lang="haskell"><span class="n" style="color: #333;">spec_imports</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="LC676" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Module</span></span>
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<pre style="margin: 0;">-<span id="LC677" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SpecEnv</span> <span class="c1" style="color: #998; font-style: italic;">-- Passed in so that all top-level Ids are in scope</span></span>
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<pre style="margin: 0;">+<span id="LC672" class="line" lang="haskell"><span class="n" style="color: #333;">spec_imports</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SpecEnv</span> <span class="c1" style="color: #998; font-style: italic;">-- Passed in so that all top-level Ids are in scope</span></span>
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<pre style="margin: 0;"> <span id="LC673" 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;">Id</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- Stack of imported functions being specialised</span></span>
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<pre style="margin: 0;"> <span id="LC674" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [specImport call stack]</span></span>
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<pre style="margin: 0;"> <span id="LC675" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RuleBase</span> <span class="c1" style="color: #998; font-style: italic;">-- Rules from this module and the home package</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">@@ -684,8 +679,7 @@ spec_imports :: DynFlags</td>
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<pre style="margin: 0;"> <span id="LC679" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CallDetails</span> <span class="c1" style="color: #998; font-style: italic;">-- Calls for imported things</span></span>
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680
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<pre style="margin: 0;"> <span id="LC680" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreM</span> <span class="p">(</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoreRule</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- New rules</span></span>
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686
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681
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<pre style="margin: 0;"> <span id="LC681" class="line" lang="haskell"> <span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoreBind</span><span class="p">]</span> <span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Specialised bindings</span></span>
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<pre style="margin: 0;">-<span id="LC687" class="line" lang="haskell"><span class="n" style="color: #333;">spec_imports</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">this_mod</span> <span class="n" style="color: #333;">top_env</span></span>
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<pre style="margin: 0;">-<span id="LC688" class="line" lang="haskell"> <span class="n" style="color: #333;">callers</span> <span class="n" style="color: #333;">rule_base</span> <span class="n" style="color: #333;">dict_binds</span> <span class="n" style="color: #333;">calls</span></span>
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<pre style="margin: 0;">+<span id="LC682" class="line" lang="haskell"><span class="n" style="color: #333;">spec_imports</span> <span class="n" style="color: #333;">top_env</span> <span class="n" style="color: #333;">callers</span> <span class="n" style="color: #333;">rule_base</span> <span class="n" style="color: #333;">dict_binds</span> <span class="n" style="color: #333;">calls</span></span>
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<pre style="margin: 0;"> <span id="LC683" 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;">import_calls</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dVarEnvElts</span> <span class="n" style="color: #333;">calls</span></span>
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684
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<pre style="margin: 0;"> <span id="LC684" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ; debugTraceMsg (text "specImports {" <+></span></span>
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685
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<pre style="margin: 0;"> <span id="LC685" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- vcat [ text "calls:" <+> ppr import_calls</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">@@ -699,16 +693,13 @@ spec_imports dflags this_mod top_env</td>
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693
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<pre style="margin: 0;"> <span id="LC693" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span></span>
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700
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694
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<pre style="margin: 0;"> <span id="LC694" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">rb</span> <span class="p">(</span><span class="n" style="color: #333;">cis</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">other_calls</span><span class="p">)</span></span>
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701
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695
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<pre style="margin: 0;"> <span id="LC695" 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="c1" style="color: #998; font-style: italic;">-- debugTraceMsg (text "specImport {" <+> ppr cis)</span></span>
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702
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<pre style="margin: 0;">-<span id="LC702" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">rules1</span><span class="p">,</span> <span class="n" style="color: #333;">spec_binds1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">spec_import</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">this_mod</span> <span class="n" style="color: #333;">top_env</span></span>
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<pre style="margin: 0;">-<span id="LC703" class="line" lang="haskell"> <span class="n" style="color: #333;">callers</span> <span class="n" style="color: #333;">rb</span> <span class="n" style="color: #333;">dict_binds</span> <span class="n" style="color: #333;">cis</span></span>
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<pre style="margin: 0;">+<span id="LC696" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">rules1</span><span class="p">,</span> <span class="n" style="color: #333;">spec_binds1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">spec_import</span> <span class="n" style="color: #333;">top_env</span> <span class="n" style="color: #333;">callers</span> <span class="n" style="color: #333;">rb</span> <span class="n" style="color: #333;">dict_binds</span> <span class="n" style="color: #333;">cis</span></span>
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<pre style="margin: 0;"> <span id="LC697" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ; debugTraceMsg (text "specImport }" <+> ppr cis)</span></span>
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698
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<pre style="margin: 0;"> <span id="LC698" class="line" lang="haskell"></span>
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699
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<pre style="margin: 0;"> <span id="LC699" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">rules2</span><span class="p">,</span> <span class="n" style="color: #333;">spec_binds2</span><span class="p">)</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;">extendRuleBaseList</span> <span class="n" style="color: #333;">rb</span> <span class="n" style="color: #333;">rules1</span><span class="p">)</span> <span class="n" style="color: #333;">other_calls</span></span>
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707
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700
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<pre style="margin: 0;"> <span id="LC700" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">rules1</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">rules2</span><span class="p">,</span> <span class="n" style="color: #333;">spec_binds1</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">spec_binds2</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC701" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC709" class="line" lang="haskell"><span class="n" style="color: #333;">spec_import</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="LC710" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Module</span></span>
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<pre style="margin: 0;">-<span id="LC711" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SpecEnv</span> <span class="c1" style="color: #998; font-style: italic;">-- Passed in so that all top-level Ids are in scope</span></span>
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<pre style="margin: 0;">+<span id="LC702" class="line" lang="haskell"><span class="n" style="color: #333;">spec_import</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SpecEnv</span> <span class="c1" style="color: #998; font-style: italic;">-- Passed in so that all top-level Ids are in scope</span></span>
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<pre style="margin: 0;"> <span id="LC703" 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;">Id</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- Stack of imported functions being specialised</span></span>
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<pre style="margin: 0;"> <span id="LC704" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [specImport call stack]</span></span>
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<pre style="margin: 0;"> <span id="LC705" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RuleBase</span> <span class="c1" style="color: #998; font-style: italic;">-- Rules from this module</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">@@ -717,8 +708,7 @@ spec_import :: DynFlags</td>
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<pre style="margin: 0;"> <span id="LC708" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CallInfoSet</span> <span class="c1" style="color: #998; font-style: italic;">-- Imported function and calls for it</span></span>
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<pre style="margin: 0;"> <span id="LC709" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreM</span> <span class="p">(</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoreRule</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- New rules</span></span>
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<pre style="margin: 0;"> <span id="LC710" class="line" lang="haskell"> <span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoreBind</span><span class="p">]</span> <span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Specialised bindings</span></span>
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<pre style="margin: 0;">-<span id="LC720" class="line" lang="haskell"><span class="n" style="color: #333;">spec_import</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">this_mod</span> <span class="n" style="color: #333;">top_env</span> <span class="n" style="color: #333;">callers</span></span>
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<pre style="margin: 0;">-<span id="LC721" class="line" lang="haskell"> <span class="n" style="color: #333;">rb</span> <span class="n" style="color: #333;">dict_binds</span> <span class="n" style="color: #333;">cis</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CIS</span> <span class="n" style="color: #333;">fn</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC711" class="line" lang="haskell"><span class="n" style="color: #333;">spec_import</span> <span class="n" style="color: #333;">top_env</span> <span class="n" style="color: #333;">callers</span> <span class="n" style="color: #333;">rb</span> <span class="n" style="color: #333;">dict_binds</span> <span class="n" style="color: #333;">cis</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CIS</span> <span class="n" style="color: #333;">fn</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC712" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isIn</span> <span class="s" style="color: #d14;">"specImport"</span> <span class="n" style="color: #333;">fn</span> <span class="n" style="color: #333;">callers</span></span>
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<pre style="margin: 0;"> <span id="LC713" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- No warning. This actually happens all the time</span></span>
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<pre style="margin: 0;"> <span id="LC714" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- when specialising a recursive function, because</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">@@ -729,8 +719,7 @@ spec_import dflags this_mod top_env callers</td>
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<pre style="margin: 0;"> <span id="LC719" 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="c1" style="color: #998; font-style: italic;">-- debugTraceMsg (text "specImport:no valid calls")</span></span>
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<pre style="margin: 0;"> <span id="LC720" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC721" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC732" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">wantSpecImport</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">unfolding</span></span>
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<pre style="margin: 0;">-<span id="LC733" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">rhs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">maybeUnfoldingTemplate</span> <span class="n" style="color: #333;">unfolding</span></span>
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722
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<pre style="margin: 0;">+<span id="LC722" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">rhs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">maybeUnfoldingTemplate</span> <span class="n" style="color: #333;">unfolding</span></span>
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734
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723
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<pre style="margin: 0;"> <span id="LC723" 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="c1" style="color: #998; font-style: italic;">-- Get rules from the external package state</span></span>
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724
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<pre style="margin: 0;"> <span id="LC724" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We keep doing this in case we "page-fault in"</span></span>
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736
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725
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<pre style="margin: 0;"> <span id="LC725" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- more rules as we go along</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">@@ -742,8 +731,8 @@ spec_import dflags this_mod top_env callers</td>
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<pre style="margin: 0;"> <span id="LC731" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC732" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">rules1</span><span class="p">,</span> <span class="n" style="color: #333;">spec_pairs</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">MkUD</span> <span class="p">{</span> <span class="n" style="color: #333;">ud_binds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dict_binds1</span><span class="p">,</span> <span class="n" style="color: #333;">ud_calls</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">new_calls</span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC733" 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="c1" style="color: #998; font-style: italic;">-- debugTraceMsg (text "specImport1" <+> vcat [ppr fn, ppr good_calls, ppr rhs])</span></span>
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745
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<pre style="margin: 0;">-<span id="LC745" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">runSpecM</span> <span class="n" style="color: #333;"><span class="idiff left">dflags</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">this_mod</span></span><span class="idiff right"> </span><span class="o" style="font-weight: 600;">$</span></span>
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746
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<pre style="margin: 0;">-<span id="LC746" class="line" lang="haskell"> <span class="n" style="color: #333;">specCalls</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Just</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">this_mod</span></span><span class="p"><span class="idiff right">)</span></span> <span class="n" style="color: #333;">top_env</span> <span class="n" style="color: #333;">rules_for_fn</span> <span class="n" style="color: #333;">good_calls</span> <span class="n" style="color: #333;">fn</span> <span class="n" style="color: #333;">rhs</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC734" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">runSpecM</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC735" class="line" lang="haskell"> <span class="n" style="color: #333;">specCalls</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">True</span></span> <span class="n" style="color: #333;">top_env</span> <span class="n" style="color: #333;">rules_for_fn</span> <span class="n" style="color: #333;">good_calls</span> <span class="n" style="color: #333;">fn</span> <span class="n" style="color: #333;">rhs</span> <span class="p">}</span></span>
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747
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736
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<pre style="margin: 0;"> <span id="LC736" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">spec_binds1</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">NonRec</span> <span class="n" style="color: #333;">b</span> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">b</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;">spec_pairs</span><span class="p">]</span></span>
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748
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737
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<pre style="margin: 0;"> <span id="LC737" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- After the rules kick in we may get recursion, but</span></span>
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738
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<pre style="margin: 0;"> <span id="LC738" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we rely on a global GlomBinds to sort that out later</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">@@ -751,7 +740,7 @@ spec_import dflags this_mod top_env callers</td>
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751
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740
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<pre style="margin: 0;"> <span id="LC740" class="line" lang="haskell"></span>
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741
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<pre style="margin: 0;"> <span id="LC741" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Now specialise any cascaded calls</span></span>
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753
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<pre style="margin: 0;"> <span id="LC742" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ; debugTraceMsg (text "specImport 2" <+> (ppr fn $$ ppr rules1 $$ ppr spec_binds1))</span></span>
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<pre style="margin: 0;">-<span id="LC754" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">rules2</span><span class="p">,</span> <span class="n" style="color: #333;">spec_binds2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">spec_imports</span> <span class="n" style="color: #333;"><span class="idiff left">dflags</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">this_mod</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">top_env</span></span>
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<pre style="margin: 0;">+<span id="LC743" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">rules2</span><span class="p">,</span> <span class="n" style="color: #333;">spec_binds2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">spec_imports</span> <span class="n" style="color: #333;">top_env</span></span>
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755
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<pre style="margin: 0;"> <span id="LC744" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">fn</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">callers</span><span class="p">)</span></span>
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756
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<pre style="margin: 0;"> <span id="LC745" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">extendRuleBaseList</span> <span class="n" style="color: #333;">rb</span> <span class="n" style="color: #333;">rules1</span><span class="p">)</span></span>
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757
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746
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<pre style="margin: 0;"> <span id="LC746" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">dict_binds</span> <span class="p">`</span><span class="n" style="color: #333;">unionBags</span><span class="p">`</span> <span class="n" style="color: #333;">dict_binds1</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">@@ -767,6 +756,7 @@ spec_import dflags this_mod top_env callers</td>
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<pre style="margin: 0;"> <span id="LC756" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)}</span></span>
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768
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757
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<pre style="margin: 0;"> <span id="LC757" class="line" lang="haskell"></span>
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769
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758
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<pre style="margin: 0;"> <span id="LC758" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC759" 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;">se_dflags</span> <span class="n" style="color: #333;">top_env</span></span>
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770
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760
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<pre style="margin: 0;"> <span id="LC760" class="line" lang="haskell"> <span class="n" style="color: #333;">unfolding</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">realIdUnfolding</span> <span class="n" style="color: #333;">fn</span> <span class="c1" style="color: #998; font-style: italic;">-- We want to see the unfolding even for loop breakers</span></span>
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771
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<pre style="margin: 0;"> <span id="LC761" class="line" lang="haskell"> <span class="n" style="color: #333;">good_calls</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filterCalls</span> <span class="n" style="color: #333;">cis</span> <span class="n" style="color: #333;">dict_binds</span></span>
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<pre style="margin: 0;"> <span id="LC762" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- SUPER IMPORTANT! Drop calls that (directly or indirectly) refer to fn</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="796" 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">@@ -796,22 +786,6 @@ tryWarnMissingSpecs dflags callers fn calls_for_fn</td>
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796
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786
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<pre style="margin: 0;"> <span id="LC786" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">whenPprDebug</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"calls:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">vcat</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">pprCallInfo</span> <span class="n" style="color: #333;">fn</span><span class="p">)</span> <span class="n" style="color: #333;">calls_for_fn</span><span class="p">))</span></span>
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787
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<pre style="margin: 0;"> <span id="LC787" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Probable fix: add INLINABLE pragma on"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fn</span><span class="p">)</span> <span class="p">])</span></span>
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788
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<pre style="margin: 0;"> <span id="LC788" class="line" lang="haskell"></span>
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799
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<pre style="margin: 0;">-<span id="LC799" class="line" lang="haskell"><span class="n" style="color: #333;">wantSpecImport</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;">Unfolding</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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800
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<pre style="margin: 0;">-<span id="LC800" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Specialise imported INLINABLE things]</span></span>
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801
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<pre style="margin: 0;">-<span id="LC801" class="line" lang="haskell"><span class="n" style="color: #333;">wantSpecImport</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">unf</span></span>
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802
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<pre style="margin: 0;">-<span id="LC802" 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;">unf</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC803" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NoUnfolding</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">-<span id="LC804" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">BootUnfolding</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">-<span id="LC805" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">OtherCon</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">-<span id="LC806" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DFunUnfolding</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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<pre style="margin: 0;">-<span id="LC807" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CoreUnfolding</span> <span class="p">{</span> <span class="n" style="color: #333;">uf_src</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">src</span><span class="p">,</span> <span class="n" style="color: #333;">uf_guidance</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">_guidance</span> <span class="p">}</span></span>
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808
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<pre style="margin: 0;">-<span id="LC808" class="line" lang="haskell"> <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_SpecialiseAggressively</span> <span class="n" style="color: #333;">dflags</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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809
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<pre style="margin: 0;">-<span id="LC809" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isStableSource</span> <span class="n" style="color: #333;">src</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">-<span id="LC810" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Specialise even INLINE things; it hasn't inlined yet,</span></span>
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<pre style="margin: 0;">-<span id="LC811" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- so perhaps it never will. Moreover it may have calls</span></span>
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812
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<pre style="margin: 0;">-<span id="LC812" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- inside it that we want to specialise</span></span>
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<pre style="margin: 0;">-<span id="LC813" 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;">False</span> <span class="c1" style="color: #998; font-style: italic;">-- Stable, not INLINE, hence INLINABLE</span></span>
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<pre style="margin: 0;">-<span id="LC814" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC789" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Avoiding loops in specImports]</span></span>
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<pre style="margin: 0;"> <span id="LC790" 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="LC791" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We must take great care when specialising instance declarations</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">@@ -1001,6 +975,9 @@ data SpecEnv</td>
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<pre style="margin: 0;"> <span id="LC975" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Dict Ids that we know something about</span></span>
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<pre style="margin: 0;"> <span id="LC976" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- and hence may be worth specialising against</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;">-- See Note [Interesting dictionary arguments]</span></span>
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<pre style="margin: 0;">+<span id="LC978" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC979" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">se_module</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Module</span></span>
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<pre style="margin: 0;">+<span id="LC980" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">se_dflags</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="LC981" class="line" lang="haskell"> <span class="p">}</span></span>
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982
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<pre style="margin: 0;"> <span id="LC982" class="line" lang="haskell"></span>
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983
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<pre style="margin: 0;"> <span id="LC983" 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;">SpecEnv</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="1285" 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">@@ -1308,7 +1285,7 @@ specDefn :: SpecEnv</td>
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1308
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1285
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<pre style="margin: 0;"> <span id="LC1285" class="line" lang="haskell"><span class="n" style="color: #333;">specDefn</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">body_uds</span> <span class="n" style="color: #333;">fn</span> <span class="n" style="color: #333;">rhs</span></span>
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1309
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1286
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<pre style="margin: 0;"> <span id="LC1286" 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="p">(</span><span class="n" style="color: #333;">body_uds_without_me</span><span class="p">,</span> <span class="n" style="color: #333;">calls_for_me</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">callsForMe</span> <span class="n" style="color: #333;">fn</span> <span class="n" style="color: #333;">body_uds</span></span>
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1310
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1287
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<pre style="margin: 0;"> <span id="LC1287" class="line" lang="haskell"> <span class="n" style="color: #333;">rules_for_me</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">idCoreRules</span> <span class="n" style="color: #333;">fn</span></span>
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1311
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<pre style="margin: 0;">-<span id="LC1311" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">rules</span><span class="p">,</span> <span class="n" style="color: #333;">spec_defns</span><span class="p">,</span> <span class="n" style="color: #333;">spec_uds</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">specCalls</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Nothing</span></span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">rules_for_me</span></span>
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1288
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<pre style="margin: 0;">+<span id="LC1288" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">rules</span><span class="p">,</span> <span class="n" style="color: #333;">spec_defns</span><span class="p">,</span> <span class="n" style="color: #333;">spec_uds</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">specCalls</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">False</span></span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">rules_for_me</span></span>
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1312
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1289
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<pre style="margin: 0;"> <span id="LC1289" class="line" lang="haskell"> <span class="n" style="color: #333;">calls_for_me</span> <span class="n" style="color: #333;">fn</span> <span class="n" style="color: #333;">rhs</span></span>
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1313
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1290
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<pre style="margin: 0;"> <span id="LC1290" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span> <span class="n" style="color: #333;">fn</span> <span class="p">`</span><span class="n" style="color: #333;">addIdSpecialisations</span><span class="p">`</span> <span class="n" style="color: #333;">rules</span></span>
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1314
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1291
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<pre style="margin: 0;"> <span id="LC1291" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">spec_defns</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">@@ -1321,8 +1298,8 @@ specDefn env body_uds fn rhs</td>
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1321
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1298
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<pre style="margin: 0;"> <span id="LC1298" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- body_uds_without_me</span></span>
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1322
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1299
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<pre style="margin: 0;"> <span id="LC1299" class="line" lang="haskell"></span>
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1323
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1300
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<pre style="margin: 0;"> <span id="LC1300" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">---------------------------</span></span>
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1324
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<pre style="margin: 0;">-<span id="LC1324" class="line" lang="haskell"><span class="n" style="color: #333;">specCalls</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Maybe</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Module</span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- Just this_mod</span> => specialising imported fn</span></span>
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1325
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<pre style="margin: 0;">-<span id="LC1325" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">Nothing </span> => specialising local fn</span></span>
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1301
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<pre style="margin: 0;">+<span id="LC1301" class="line" lang="haskell"><span class="n" style="color: #333;">specCalls</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Bool</span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- True</span> => specialising imported fn</span></span>
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1302
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<pre style="margin: 0;">+<span id="LC1302" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">False</span> => specialising local fn</span></span>
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1326
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1303
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<pre style="margin: 0;"> <span id="LC1303" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SpecEnv</span></span>
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1327
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1304
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<pre style="margin: 0;"> <span id="LC1304" 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;">CoreRule</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- Existing RULES for the fn</span></span>
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1305
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<pre style="margin: 0;"> <span id="LC1305" 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;">CallInfo</span><span class="p">]</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1337" 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="1314" 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">@@ -1337,7 +1314,7 @@ type SpecInfo = ( [CoreRule] -- Specialisation rules</td>
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1337
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1314
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<pre style="margin: 0;"> <span id="LC1314" class="line" lang="haskell"> <span class="p">,</span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">)]</span> <span class="c1" style="color: #998; font-style: italic;">-- Specialised definition</span></span>
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1338
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1315
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<pre style="margin: 0;"> <span id="LC1315" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">UsageDetails</span> <span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Usage details from specialised RHSs</span></span>
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1339
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1316
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<pre style="margin: 0;"> <span id="LC1316" class="line" lang="haskell"></span>
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1340
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<pre style="margin: 0;">-<span id="LC1340" class="line" lang="haskell"><span class="n" style="color: #333;">specCalls</span> <span class="n" style="color: #333;"><span class="idiff left right">mb_mod</span></span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">existing_rules</span> <span class="n" style="color: #333;">calls_for_me</span> <span class="n" style="color: #333;">fn</span> <span class="n" style="color: #333;">rhs</span></span>
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1317
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<pre style="margin: 0;">+<span id="LC1317" class="line" lang="haskell"><span class="n" style="color: #333;">specCalls</span> <span class="n" style="color: #333;"><span class="idiff left right">spec_imp</span></span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">existing_rules</span> <span class="n" style="color: #333;">calls_for_me</span> <span class="n" style="color: #333;">fn</span> <span class="n" style="color: #333;">rhs</span></span>
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1341
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1318
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<pre style="margin: 0;"> <span id="LC1318" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The first case is the interesting one</span></span>
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1342
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1319
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<pre style="margin: 0;"> <span id="LC1319" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">notNull</span> <span class="n" style="color: #333;">calls_for_me</span> <span class="c1" style="color: #998; font-style: italic;">-- And there are some calls to specialise</span></span>
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1343
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1320
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<pre style="margin: 0;"> <span id="LC1320" class="line" lang="haskell"> <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;">isNeverActive</span> <span class="p">(</span><span class="n" style="color: #333;">idInlineActivation</span> <span class="n" style="color: #333;">fn</span><span class="p">))</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1368" 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="1345" 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">@@ -1368,7 +1345,9 @@ specCalls mb_mod env existing_rules calls_for_me fn rhs</td>
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1368
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1345
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<pre style="margin: 0;"> <span id="LC1345" class="line" lang="haskell"> <span class="n" style="color: #333;">inl_act</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">inlinePragmaActivation</span> <span class="n" style="color: #333;">inl_prag</span></span>
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1369
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1346
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<pre style="margin: 0;"> <span id="LC1346" class="line" lang="haskell"> <span class="n" style="color: #333;">is_local</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isLocalId</span> <span class="n" style="color: #333;">fn</span></span>
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1370
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1347
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<pre style="margin: 0;"> <span id="LC1347" class="line" lang="haskell"> <span class="n" style="color: #333;">is_dfun</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isDFunId</span> <span class="n" style="color: #333;">fn</span></span>
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1371
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<td class="diff-line-num new_line old" data-linenumber="1348" 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="LC1371" class="line" lang="haskell"></span>
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1348
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<pre style="margin: 0;">+<span id="LC1348" 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;">se_dflags</span> <span class="n" style="color: #333;">env</span></span>
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1349
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<pre style="margin: 0;">+<span id="LC1349" class="line" lang="haskell"> <span class="n" style="color: #333;">ropts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">initRuleOpts</span> <span class="n" style="color: #333;">dflags</span></span>
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1350
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<pre style="margin: 0;">+<span id="LC1350" class="line" lang="haskell"> <span class="n" style="color: #333;">this_mod</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">se_module</span> <span class="n" style="color: #333;">env</span></span>
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1372
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1351
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<pre style="margin: 0;"> <span id="LC1351" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Figure out whether the function has an INLINE pragma</span></span>
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1373
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1352
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<pre style="margin: 0;"> <span id="LC1352" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Inline specialisations]</span></span>
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1374
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1353
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<pre style="margin: 0;"> <span id="LC1353" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1389" 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">@@ -1410,8 +1389,6 @@ specCalls mb_mod env existing_rules calls_for_me fn rhs</td>
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1410
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1389
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<pre style="margin: 0;"> <span id="LC1389" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- , ppr dx_binds ]) $</span></span>
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1411
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1390
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<pre style="margin: 0;"> <span id="LC1390" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- return ()</span></span>
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1412
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1391
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<pre style="margin: 0;"> <span id="LC1391" class="line" lang="haskell"></span>
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1413
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<pre style="margin: 0;">-<span id="LC1413" 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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1414
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<pre style="margin: 0;">-<span id="LC1414" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ropts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">initRuleOpts</span> <span class="n" style="color: #333;">dflags</span></span>
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1415
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1392
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<pre style="margin: 0;"> <span id="LC1392" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">useful</span> <span class="c1" style="color: #998; font-style: italic;">-- No useful specialisation</span></span>
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1416
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1393
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<pre style="margin: 0;"> <span id="LC1393" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">already_covered</span> <span class="n" style="color: #333;">ropts</span> <span class="n" style="color: #333;">rules_acc</span> <span class="n" style="color: #333;">rule_lhs_args</span></span>
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1417
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1394
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<pre style="margin: 0;"> <span id="LC1394" 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;">spec_acc</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">@@ -1439,17 +1416,15 @@ specCalls mb_mod env existing_rules calls_for_me fn rhs</td>
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1439
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1416
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<pre style="margin: 0;"> <span id="LC1416" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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1440
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1417
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<pre style="margin: 0;"> <span id="LC1417" class="line" lang="haskell"></span>
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1441
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1418
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<pre style="margin: 0;"> <span id="LC1418" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">spec_fn</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newSpecIdSM</span> <span class="n" style="color: #333;">fn</span> <span class="n" style="color: #333;">spec_fn_ty</span> <span class="n" style="color: #333;">spec_join_arity</span></span>
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1442
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<pre style="margin: 0;">-<span id="LC1442" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">this_mod</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getModule</span></span>
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1443
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1419
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<pre style="margin: 0;"> <span id="LC1419" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span></span>
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1444
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1420
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<pre style="margin: 0;"> <span id="LC1420" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The rule to put in the function's specialisation is:</span></span>
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1445
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1421
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<pre style="margin: 0;"> <span id="LC1421" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- forall x @b d1' d2'.</span></span>
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1446
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1422
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<pre style="margin: 0;"> <span id="LC1422" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- f x @T1 @b @T2 d1' d2' = f1 x @b</span></span>
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1447
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1423
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<pre style="margin: 0;"> <span id="LC1423" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Specialising Calls]</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;">herald</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">mb_mod</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1449
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<pre style="margin: 0;">-<span id="LC1449" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="c1" style="color: #998; font-style: italic;">-- Specialising local fn</span></span>
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1450
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<pre style="margin: 0;">-<span id="LC1450" 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;">"SPEC"</span></span>
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1451
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<pre style="margin: 0;">-<span id="LC1451" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">this_mod</span> <span class="c1" style="color: #998; font-style: italic;">-- Specialising imported fn</span></span>
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1452
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<pre style="margin: 0;">-<span id="LC1452" 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;">"SPEC/"</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">this_mod</span></span>
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1424
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<pre style="margin: 0;">+<span id="LC1424" class="line" lang="haskell"> <span class="n" style="color: #333;">herald</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">spec_imp</span> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- Specialising imported fn</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;">text</span> <span class="s" style="color: #d14;">"SPEC/"</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">this_mod</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="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- Specialising local fn</span></span>
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1427
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<pre style="margin: 0;">+<span id="LC1427" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"SPEC"</span></span>
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1453
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1428
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<pre style="margin: 0;"> <span id="LC1428" class="line" lang="haskell"></span>
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1454
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1429
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<pre style="margin: 0;"> <span id="LC1429" class="line" lang="haskell"> <span class="n" style="color: #333;">rule_name</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkFastString</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">showSDoc</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;">$</span></span>
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1455
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1430
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<pre style="margin: 0;"> <span id="LC1430" class="line" lang="haskell"> <span class="n" style="color: #333;">herald</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ftext</span> <span class="p">(</span><span class="n" style="color: #333;">occNameFS</span> <span class="p">(</span><span class="n" style="color: #333;">getOccName</span> <span class="n" style="color: #333;">fn</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">@@ -2476,15 +2451,15 @@ mkCallUDs env f args</td>
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2476
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2451
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<pre style="margin: 0;"> <span id="LC2451" class="line" lang="haskell"> <span class="n" style="color: #333;">res</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkCallUDs'</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">args</span></span>
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2477
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2452
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<pre style="margin: 0;"> <span id="LC2452" class="line" lang="haskell"></span>
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2478
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<pre style="margin: 0;"> <span id="LC2453" class="line" lang="haskell"><span class="n" style="color: #333;">mkCallUDs'</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">args</span></span>
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2479
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<pre style="margin: 0;">-<span id="LC2479" class="line" lang="haskell"> <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;">want_calls_for</span> <span class="n" style="color: #333;">f</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Imported from elsewhere</span></span>
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2480
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<pre style="margin: 0;">-<span id="LC2480" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">ci_key</span> <span class="c1" style="color: #998; font-style: italic;">-- No useful specialisation</span></span>
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2481
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<pre style="margin: 0;">-<span id="LC2481" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See also Note [Specialisations already covered]</span></span>
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<pre style="margin: 0;">+<span id="LC2454" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">wantCallsFor</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">f</span> <span class="c1" style="color: #998; font-style: italic;">-- We want it, and...</span></span>
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<pre style="margin: 0;">+<span id="LC2455" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">ci_key</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- this call site has a useful specialisation</span></span>
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2456
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<pre style="margin: 0;">+<span id="LC2456" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- pprTrace "mkCallUDs: keeping" _trace_doc</span></span>
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2457
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<pre style="margin: 0;">+<span id="LC2457" class="line" lang="haskell"> <span class="n" style="color: #333;">singleCall</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">ci_key</span></span>
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<pre style="margin: 0;">+<span id="LC2458" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2459" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="c1" style="color: #998; font-style: italic;">-- See also Note [Specialisations already covered]</span></span>
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2482
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2460
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<pre style="margin: 0;"> <span id="LC2460" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- pprTrace "mkCallUDs: discarding" _trace_doc</span></span>
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2483
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2461
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<pre style="margin: 0;"> <span id="LC2461" class="line" lang="haskell"> <span class="n" style="color: #333;">emptyUDs</span></span>
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2484
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<pre style="margin: 0;"> <span id="LC2462" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2485" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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2486
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<pre style="margin: 0;">-<span id="LC2486" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- pprTrace "mkCallUDs: keeping" _trace_doc</span></span>
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2487
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<pre style="margin: 0;">-<span id="LC2487" class="line" lang="haskell"> <span class="n" style="color: #333;">singleCall</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">ci_key</span></span>
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2488
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2463
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<pre style="margin: 0;"> <span id="LC2463" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2489
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2464
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<pre style="margin: 0;"> <span id="LC2464" class="line" lang="haskell"> <span class="n" style="color: #333;">_trace_doc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">f</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">args</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ci_key</span><span class="p">]</span></span>
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2490
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2465
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<pre style="margin: 0;"> <span id="LC2465" class="line" lang="haskell"> <span class="n" style="color: #333;">pis</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fst</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">splitPiTys</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">f</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">@@ -2518,13 +2493,6 @@ mkCallUDs' env f args</td>
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2518
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2493
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<pre style="margin: 0;"> <span id="LC2493" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_spec_arg</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Anon</span> <span class="kt" style="color: #458; font-weight: 600;">VisArg</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span></span>
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2519
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2494
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<pre style="margin: 0;"> <span id="LC2494" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">UnspecArg</span></span>
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2520
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2495
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<pre style="margin: 0;"> <span id="LC2495" class="line" lang="haskell"></span>
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2521
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<pre style="margin: 0;">-<span id="LC2521" class="line" lang="haskell"> <span class="n" style="color: #333;">want_calls_for</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isLocalId</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">isJust</span> <span class="p">(</span><span class="n" style="color: #333;">maybeUnfoldingTemplate</span> <span class="p">(</span><span class="n" style="color: #333;">realIdUnfolding</span> <span class="n" style="color: #333;">f</span><span class="p">))</span></span>
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2522
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<pre style="margin: 0;">-<span id="LC2522" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- For imported things, we gather call instances if</span></span>
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2523
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<pre style="margin: 0;">-<span id="LC2523" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- there is an unfolding that we could in principle specialise</span></span>
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2524
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<pre style="margin: 0;">-<span id="LC2524" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We might still decide not to use it (consulting dflags)</span></span>
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2525
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<pre style="margin: 0;">-<span id="LC2525" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in specImports</span></span>
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2526
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<pre style="margin: 0;">-<span id="LC2526" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Use 'realIdUnfolding' to ignore the loop-breaker flag!</span></span>
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2527
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<pre style="margin: 0;">-<span id="LC2527" class="line" lang="haskell"></span>
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2528
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2496
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<pre style="margin: 0;"> <span id="LC2496" class="line" lang="haskell"> <span class="n" style="color: #333;">type_determines_value</span> <span class="n" style="color: #333;">pred</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Type determines value]</span></span>
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2529
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2497
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<pre style="margin: 0;"> <span id="LC2497" 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;">classifyPredType</span> <span class="n" style="color: #333;">pred</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2530
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2498
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<pre style="margin: 0;"> <span id="LC2498" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ClassPred</span> <span class="n" style="color: #333;">cls</span> <span class="kr" style="font-weight: 600;">_</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;">isIPClass</span> <span class="n" style="color: #333;">cls</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Superclasses can't be IPs</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2533" 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">@@ -2533,7 +2501,68 @@ mkCallUDs' env f args</td>
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2533
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2501
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<pre style="margin: 0;"> <span id="LC2501" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Constraint-ranged family; #7785</span></span>
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2534
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2502
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<pre style="margin: 0;"> <span id="LC2502" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ForAllPred</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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2535
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2503
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<pre style="margin: 0;"> <span id="LC2503" class="line" lang="haskell"></span>
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2536
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<pre style="margin: 0;">-<span id="LC2536" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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2504
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<pre style="margin: 0;">+<span id="LC2504" class="line" lang="haskell"><span class="n" style="color: #333;">wantCallsFor</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SpecEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</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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2505
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<pre style="margin: 0;">+<span id="LC2505" class="line" lang="haskell"><span class="n" style="color: #333;">wantCallsFor</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">f</span></span>
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2506
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<pre style="margin: 0;">+<span id="LC2506" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isLocalId</span> <span class="n" style="color: #333;">f</span> <span class="c1" style="color: #998; font-style: italic;">-- Local function; don't look at the unfolding, because</span></span>
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2507
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<pre style="margin: 0;">+<span id="LC2507" class="line" lang="haskell"> <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;">-- unfoldings for local functions are discarded by cloneBind</span></span>
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2508
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<pre style="margin: 0;">+<span id="LC2508" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ToDo: we could keep a candidate set of let-binders to</span></span>
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2509
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<pre style="margin: 0;">+<span id="LC2509" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- reduce the size of the UsageDetails</span></span>
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2510
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<pre style="margin: 0;">+<span id="LC2510" class="line" lang="haskell"></span>
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2511
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<pre style="margin: 0;">+<span id="LC2511" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="c1" style="color: #998; font-style: italic;">-- Imported function</span></span>
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2512
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<pre style="margin: 0;">+<span id="LC2512" 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;">unf</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2513
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<pre style="margin: 0;">+<span id="LC2513" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NoUnfolding</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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2514
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<pre style="margin: 0;">+<span id="LC2514" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">BootUnfolding</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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2515
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<pre style="margin: 0;">+<span id="LC2515" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">OtherCon</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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2516
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<pre style="margin: 0;">+<span id="LC2516" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CoreUnfolding</span> <span class="p">{</span> <span class="n" style="color: #333;">uf_src</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">src</span> <span class="p">}</span></span>
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2517
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<pre style="margin: 0;">+<span id="LC2517" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isStableSource</span> <span class="n" style="color: #333;">src</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;">-- INLINEABLE/INLINE</span></span>
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2518
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<pre style="margin: 0;">+<span id="LC2518" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Specialise imported INLINABLE things]</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2519" 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">
2519
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<pre style="margin: 0;">+<span id="LC2519" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Specialise even INLINE things; it hasn't inlined yet,</span></span>
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2520
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<pre style="margin: 0;">+<span id="LC2520" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- so perhaps it never will. Moreover it may have calls</span></span>
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2521
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<pre style="margin: 0;">+<span id="LC2521" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- inside it that we want to specialise</span></span>
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2522
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<pre style="margin: 0;">+<span id="LC2522" 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;">aggressive_only</span> <span class="c1" style="color: #998; font-style: italic;">-- Imported, no INLINABLE</span></span>
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2523
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<pre style="margin: 0;">+<span id="LC2523" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DFunUnfolding</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">aggressive_only</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Do not specialise DFuns]</span></span>
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2524
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<pre style="margin: 0;">+<span id="LC2524" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2525
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<pre style="margin: 0;">+<span id="LC2525" class="line" lang="haskell"> <span class="n" style="color: #333;">aggressive_only</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_SpecialiseAggressively</span> <span class="p">(</span><span class="n" style="color: #333;">se_dflags</span> <span class="n" style="color: #333;">env</span><span class="p">)</span></span>
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2526
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<pre style="margin: 0;">+<span id="LC2526" class="line" lang="haskell"> <span class="n" style="color: #333;">unf</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">realIdUnfolding</span> <span class="n" style="color: #333;">f</span></span>
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2527
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<pre style="margin: 0;">+<span id="LC2527" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 'realIdUnfolding' to ignore the loop-breaker flag!</span></span>
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2528
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<pre style="margin: 0;">+<span id="LC2528" class="line" lang="haskell"></span>
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2529
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<pre style="margin: 0;">+<span id="LC2529" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Do not specialise DFuns]</span></span>
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2530
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<pre style="margin: 0;">+<span id="LC2530" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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2531
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<pre style="margin: 0;">+<span id="LC2531" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Ticket #18223 shows that specialising calls of DFuns is can cause a huge</span></span>
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2532
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<pre style="margin: 0;">+<span id="LC2532" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and entirely unnecessary blowup in program size. Consider a call to</span></span>
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2533
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<pre style="margin: 0;">+<span id="LC2533" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f @[[[[[[[[T]]]]]]]] d1 x</span></span>
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2534
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<pre style="margin: 0;">+<span id="LC2534" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">where df :: C a => C [a]</span></span>
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2535
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<pre style="margin: 0;">+<span id="LC2535" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> d1 :: C [[[[[[[[T]]]]]]]] = dfC[] @[[[[[[[T]]]]]]] d1</span></span>
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2536
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<pre style="margin: 0;">+<span id="LC2536" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> d2 :: C [[[[[[[T]]]]]]] = dfC[] @[[[[[[T]]]]]] d3</span></span>
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2537
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<pre style="margin: 0;">+<span id="LC2537" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ...</span></span>
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2538
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<pre style="margin: 0;">+<span id="LC2538" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Now we'll specialise f's RHS, which may give rise to calls to 'g',</span></span>
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2539
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<pre style="margin: 0;">+<span id="LC2539" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">also overloaded, which we will specialise, and so on. However, if</span></span>
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2540
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<pre style="margin: 0;">+<span id="LC2540" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we specialise the calls to dfC[], we'll generate specialised copies of</span></span>
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2541
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<pre style="margin: 0;">+<span id="LC2541" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">all methods of C, at all types; and the same for C's superclasses.</span></span>
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2542
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<pre style="margin: 0;">+<span id="LC2542" class="line" lang="haskell"></span>
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2543
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<pre style="margin: 0;">+<span id="LC2543" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">And many of these specialised functions will never be called. We are</span></span>
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2544
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<pre style="margin: 0;">+<span id="LC2544" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">going to call the specialised 'f', and the specialised 'g', but DFuns</span></span>
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2545
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<pre style="margin: 0;">+<span id="LC2545" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">group functions into a tuple, many of whose elements may never be used.</span></span>
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2546
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<pre style="margin: 0;">+<span id="LC2546" class="line" lang="haskell"></span>
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2547
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<pre style="margin: 0;">+<span id="LC2547" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">With deeply-nested types this can lead to a simply overwhelming number</span></span>
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2548
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<pre style="margin: 0;">+<span id="LC2548" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of specialisations: see #18223 for a simple example (from the wild).</span></span>
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2549
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<pre style="margin: 0;">+<span id="LC2549" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">I measured the number of specialisations for various numbers of calls</span></span>
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2550
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<pre style="margin: 0;">+<span id="LC2550" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of `flip evalStateT ()`, and got this</span></span>
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2551
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<pre style="margin: 0;">+<span id="LC2551" class="line" lang="haskell"></span>
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2552
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<pre style="margin: 0;">+<span id="LC2552" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Size after one simplification</span></span>
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2553
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<pre style="margin: 0;">+<span id="LC2553" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> #calls #SPEC rules Terms Types</span></span>
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2554
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<pre style="margin: 0;">+<span id="LC2554" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 5 56 3100 10600</span></span>
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2555
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<pre style="margin: 0;">+<span id="LC2555" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 9 108 13660 77206</span></span>
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2556
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<pre style="margin: 0;">+<span id="LC2556" class="line" lang="haskell"></span>
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2557
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<pre style="margin: 0;">+<span id="LC2557" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The real tests case has 60+ calls, which blew GHC out of the water.</span></span>
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2558
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<pre style="margin: 0;">+<span id="LC2558" class="line" lang="haskell"></span>
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2559
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<pre style="margin: 0;">+<span id="LC2559" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Solution: don't specialise DFuns. The downside is that if we end</span></span>
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2560
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<pre style="margin: 0;">+<span id="LC2560" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">up with (h (dfun d)), /and/ we don't specialise 'h', then we won't</span></span>
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2561
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<pre style="margin: 0;">+<span id="LC2561" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">pass to 'h' a tuple of specialised functions.</span></span>
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2562
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<pre style="margin: 0;">+<span id="LC2562" class="line" lang="haskell"></span>
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2563
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<pre style="margin: 0;">+<span id="LC2563" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">However, the flag -fspecialise-aggressively (experimental, off by default)</span></span>
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2564
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<pre style="margin: 0;">+<span id="LC2564" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">allows DFuns to specialise as well.</span></span>
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2565
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<pre style="margin: 0;">+<span id="LC2565" class="line" lang="haskell"></span>
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2537
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2566
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<pre style="margin: 0;"> <span id="LC2566" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Type determines value]</span></span>
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2538
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2567
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<pre style="margin: 0;"> <span id="LC2567" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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2539
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2568
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<pre style="margin: 0;"> <span id="LC2568" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Only specialise on non-IP *class* params, because these are the ones</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">@@ -2796,55 +2825,12 @@ deleteCallsFor bs calls = delDVarEnvList calls bs</td>
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2796
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<pre style="margin: 0;"> <span id="LC2825" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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2826
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<pre style="margin: 0;"> <span id="LC2826" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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2827
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<pre style="margin: 0;"> <span id="LC2827" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2799" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">SpecM</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;">SpecM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">State</span> <span class="kt" style="color: #458; font-weight: 600;">SpecState</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <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>
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2800
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<pre style="margin: 0;">-<span id="LC2800" class="line" lang="haskell"></span>
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2801
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<pre style="margin: 0;">-<span id="LC2801" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">SpecState</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SpecState</span> <span class="p">{</span></span>
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2802
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<pre style="margin: 0;">-<span id="LC2802" class="line" lang="haskell"> <span class="n" style="color: #333;">spec_uniq_supply</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">UniqSupply</span><span class="p">,</span></span>
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2803
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<pre style="margin: 0;">-<span id="LC2803" class="line" lang="haskell"> <span class="n" style="color: #333;">spec_module</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Module</span><span class="p">,</span></span>
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2804
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<pre style="margin: 0;">-<span id="LC2804" class="line" lang="haskell"> <span class="n" style="color: #333;">spec_dflags</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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2805
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<pre style="margin: 0;">-<span id="LC2805" class="line" lang="haskell"> <span class="p">}</span></span>
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2806
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<pre style="margin: 0;">-<span id="LC2806" class="line" lang="haskell"></span>
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2807
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<pre style="margin: 0;">-<span id="LC2807" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Applicative</span> <span class="kt" style="color: #458; font-weight: 600;">SpecM</span> <span class="kr" style="font-weight: 600;">where</span></span>
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2808
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<pre style="margin: 0;">-<span id="LC2808" 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;">SpecM</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">x</span></span>
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2809
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<pre style="margin: 0;">-<span id="LC2809" 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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2810
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<pre style="margin: 0;">-<span id="LC2810" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2811" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Monad</span> <span class="kt" style="color: #458; font-weight: 600;">SpecM</span> <span class="kr" style="font-weight: 600;">where</span></span>
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2812
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<pre style="margin: 0;">-<span id="LC2812" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SpecM</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SpecM</span> <span class="o" style="font-weight: 600;">$</span> <span class="kr" style="font-weight: 600;">do</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">x</span></span>
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2813
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<pre style="margin: 0;">-<span id="LC2813" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">y</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2814
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<pre style="margin: 0;">-<span id="LC2814" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SpecM</span> <span class="n" style="color: #333;">z</span> <span class="o" style="font-weight: 600;">-></span></span>
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2815
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<pre style="margin: 0;">-<span id="LC2815" class="line" lang="haskell"> <span class="n" style="color: #333;">z</span></span>
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2816
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<pre style="margin: 0;">-<span id="LC2816" class="line" lang="haskell"></span>
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2817
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<pre style="margin: 0;">-<span id="LC2817" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">MonadFail</span> <span class="kt" style="color: #458; font-weight: 600;">SpecM</span> <span class="kr" style="font-weight: 600;">where</span></span>
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2818
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<pre style="margin: 0;">-<span id="LC2818" class="line" lang="haskell"> <span class="n" style="color: #333;">fail</span> <span class="n" style="color: #333;">str</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SpecM</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">error</span> <span class="n" style="color: #333;">str</span></span>
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<pre style="margin: 0;">-<span id="LC2819" class="line" lang="haskell"></span>
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2820
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<pre style="margin: 0;">-<span id="LC2820" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">MonadUnique</span> <span class="kt" style="color: #458; font-weight: 600;">SpecM</span> <span class="kr" style="font-weight: 600;">where</span></span>
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2821
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<pre style="margin: 0;">-<span id="LC2821" class="line" lang="haskell"> <span class="n" style="color: #333;">getUniqueSupplyM</span></span>
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2822
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<pre style="margin: 0;">-<span id="LC2822" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SpecM</span> <span class="o" style="font-weight: 600;">$</span> <span class="kr" style="font-weight: 600;">do</span> <span class="n" style="color: #333;">st</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">get</span></span>
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2823
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<pre style="margin: 0;">-<span id="LC2823" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">us1</span><span class="p">,</span> <span class="n" style="color: #333;">us2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitUniqSupply</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">spec_uniq_supply</span> <span class="n" style="color: #333;">st</span></span>
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2824
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<pre style="margin: 0;">-<span id="LC2824" class="line" lang="haskell"> <span class="n" style="color: #333;">put</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">st</span> <span class="p">{</span> <span class="n" style="color: #333;">spec_uniq_supply</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">us2</span> <span class="p">}</span></span>
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2825
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<pre style="margin: 0;">-<span id="LC2825" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">us1</span></span>
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2826
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<pre style="margin: 0;">-<span id="LC2826" class="line" lang="haskell"></span>
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2827
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<pre style="margin: 0;">-<span id="LC2827" class="line" lang="haskell"> <span class="n" style="color: #333;">getUniqueM</span></span>
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2828
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<pre style="margin: 0;">-<span id="LC2828" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SpecM</span> <span class="o" style="font-weight: 600;">$</span> <span class="kr" style="font-weight: 600;">do</span> <span class="n" style="color: #333;">st</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">get</span></span>
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2829
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<pre style="margin: 0;">-<span id="LC2829" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">u</span><span class="p">,</span><span class="n" style="color: #333;">us'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">takeUniqFromSupply</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">spec_uniq_supply</span> <span class="n" style="color: #333;">st</span></span>
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2830
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<pre style="margin: 0;">-<span id="LC2830" class="line" lang="haskell"> <span class="n" style="color: #333;">put</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">st</span> <span class="p">{</span> <span class="n" style="color: #333;">spec_uniq_supply</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">us'</span> <span class="p">}</span></span>
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2831
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<pre style="margin: 0;">-<span id="LC2831" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">u</span></span>
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<pre style="margin: 0;">-<span id="LC2832" class="line" lang="haskell"></span>
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2833
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<pre style="margin: 0;">-<span id="LC2833" 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;">SpecM</span> <span class="kr" style="font-weight: 600;">where</span></span>
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2834
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<pre style="margin: 0;">-<span id="LC2834" 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;">SpecM</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">liftM</span> <span class="n" style="color: #333;">spec_dflags</span> <span class="n" style="color: #333;">get</span></span>
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2835
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<pre style="margin: 0;">-<span id="LC2835" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2836" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">HasModule</span> <span class="kt" style="color: #458; font-weight: 600;">SpecM</span> <span class="kr" style="font-weight: 600;">where</span></span>
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2837
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<pre style="margin: 0;">-<span id="LC2837" class="line" lang="haskell"> <span class="n" style="color: #333;">getModule</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SpecM</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">liftM</span> <span class="n" style="color: #333;">spec_module</span> <span class="n" style="color: #333;">get</span></span>
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2838
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<pre style="margin: 0;">-<span id="LC2838" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2839" class="line" lang="haskell"><span class="n" style="color: #333;">runSpecM</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;">Module</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SpecM</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;">CoreM</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">-<span id="LC2840" class="line" lang="haskell"><span class="n" style="color: #333;">runSpecM</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">this_mod</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SpecM</span> <span class="n" style="color: #333;">spec</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC2841" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="n" style="color: #333;">us</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getUniqueSupplyM</span></span>
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<pre style="margin: 0;">-<span id="LC2842" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">initialState</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SpecState</span> <span class="p">{</span></span>
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<pre style="margin: 0;">-<span id="LC2843" class="line" lang="haskell"> <span class="n" style="color: #333;">spec_uniq_supply</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">us</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC2844" class="line" lang="haskell"> <span class="n" style="color: #333;">spec_module</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">this_mod</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC2845" class="line" lang="haskell"> <span class="n" style="color: #333;">spec_dflags</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dflags</span></span>
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2846
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<pre style="margin: 0;">-<span id="LC2846" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC2847" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">evalState</span> <span class="n" style="color: #333;">spec</span> <span class="n" style="color: #333;">initialState</span></span>
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<pre style="margin: 0;">+<span id="LC2828" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">SpecM</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;">UniqSM</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC2829" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2830" class="line" lang="haskell"><span class="n" style="color: #333;">runSpecM</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SpecM</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;">CoreM</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC2831" class="line" lang="haskell"><span class="n" style="color: #333;">runSpecM</span> <span class="n" style="color: #333;">thing_inside</span></span>
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<pre style="margin: 0;">+<span id="LC2832" 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;">us</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getUniqueSupplyM</span></span>
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<pre style="margin: 0;">+<span id="LC2833" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">initUs_</span> <span class="n" style="color: #333;">us</span> <span class="n" style="color: #333;">thing_inside</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC2834" class="line" lang="haskell"></span>
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2835
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<pre style="margin: 0;"> <span id="LC2835" class="line" lang="haskell"><span class="n" style="color: #333;">mapAndCombineSM</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SpecM</span> <span class="p">(</span><span class="n" style="color: #333;">b</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">UsageDetails</span><span class="p">))</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SpecM</span> <span class="p">([</span><span class="n" style="color: #333;">b</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">UsageDetails</span><span class="p">)</span></span>
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2836
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<pre style="margin: 0;"> <span id="LC2836" class="line" lang="haskell"><span class="n" style="color: #333;">mapAndCombineSM</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span> <span class="n" style="color: #333;">emptyUDs</span><span class="p">)</span></span>
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<li id="a8e2a1e5829eb3b4809201e0f47e91b64ce11b96">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/716b67d9b0ce485e2bfb6951b5f0586af642cad8#a8e2a1e5829eb3b4809201e0f47e91b64ce11b96"><strong>compiler/GHC/Core/Ppr.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="161" 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="161" 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">@@ -161,15 +161,18 @@ pprOptCo co = sdocOption sdocSuppressCoercions $ \case</td>
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161
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161
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<pre style="margin: 0;"> <span id="LC161" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">angleBrackets</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Co:"</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">int</span> <span class="p">(</span><span class="n" style="color: #333;">coercionSize</span> <span class="n" style="color: #333;">co</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC162" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">parens</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">sep</span> <span class="p">[</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="n" style="color: #333;">dcolon</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;">coercionType</span> <span class="n" style="color: #333;">co</span><span class="p">)]</span></span>
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<pre style="margin: 0;"> <span id="LC163" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC164" class="line" lang="haskell"><span class="n" style="color: #333;">ppr_id_occ</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<pre style="margin: 0;">+<span id="LC165" class="line" lang="haskell"><span class="n" style="color: #333;">ppr_id_occ</span> <span class="n" style="color: #333;">add_par</span> <span class="n" style="color: #333;">id</span></span>
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<pre style="margin: 0;">+<span id="LC166" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isJoinId</span> <span class="n" style="color: #333;">id</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">add_par</span> <span class="p">((</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"jump"</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pp_id</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC167" 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;">pp_id</span></span>
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<pre style="margin: 0;">+<span id="LC168" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC169" class="line" lang="haskell"> <span class="n" style="color: #333;">pp_id</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPrefixOcc</span> <span class="n" style="color: #333;">id</span></span>
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<pre style="margin: 0;">+<span id="LC170" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC171" class="line" lang="haskell"><span class="n" style="color: #333;">ppr_expr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">OutputableBndr</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">=></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Expr</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<pre style="margin: 0;"> <span id="LC172" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The function adds parens in context that need</span></span>
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<pre style="margin: 0;"> <span id="LC173" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- an atomic value (e.g. function args)</span></span>
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<pre style="margin: 0;"> <span id="LC174" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC168" class="line" lang="haskell"><span class="n" style="color: #333;">ppr_expr</span> <span class="n" style="color: #333;">add_par</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">name</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC169" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isJoinId</span> <span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">add_par</span> <span class="p">((</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"jump"</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pp_name</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC170" 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;">pp_name</span></span>
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<pre style="margin: 0;">-<span id="LC171" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC172" class="line" lang="haskell"> <span class="n" style="color: #333;">pp_name</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPrefixOcc</span> <span class="n" style="color: #333;">name</span></span>
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<pre style="margin: 0;">+<span id="LC175" class="line" lang="haskell"><span class="n" style="color: #333;">ppr_expr</span> <span class="n" style="color: #333;">add_par</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">id</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ppr_id_occ</span> <span class="n" style="color: #333;">add_par</span> <span class="n" style="color: #333;">id</span></span>
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<pre style="margin: 0;"> <span id="LC176" class="line" lang="haskell"><span class="n" style="color: #333;">ppr_expr</span> <span class="n" style="color: #333;">add_par</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">add_par</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"TYPE:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Weird</span></span>
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<pre style="margin: 0;"> <span id="LC177" class="line" lang="haskell"><span class="n" style="color: #333;">ppr_expr</span> <span class="n" style="color: #333;">add_par</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Coercion</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;">add_par</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"CO:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>
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175
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<pre style="margin: 0;"> <span id="LC178" class="line" lang="haskell"><span class="n" style="color: #333;">ppr_expr</span> <span class="n" style="color: #333;">add_par</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Lit</span> <span class="n" style="color: #333;">lit</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprLiteral</span> <span class="n" style="color: #333;">add_par</span> <span class="n" style="color: #333;">lit</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">@@ -212,8 +215,7 @@ ppr_expr add_par expr@(App {})</td>
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212
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215
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<pre style="margin: 0;"> <span id="LC215" class="line" lang="haskell"></span>
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213
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<pre style="margin: 0;"> <span id="LC216" 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;">parens</span> <span class="p">(</span><span class="n" style="color: #333;">hang</span> <span class="n" style="color: #333;">fun_doc</span> <span class="mi" style="color: #099;">2</span> <span class="n" style="color: #333;">pp_args</span><span class="p">)</span></span>
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214
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<pre style="margin: 0;"> <span id="LC217" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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215
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<pre style="margin: 0;">-<span id="LC215" class="line" lang="haskell"> <span class="n" style="color: #333;">fun_doc</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isJoinId</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"jump"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">f</span></span>
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216
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<pre style="margin: 0;">-<span id="LC216" 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;">ppr</span> <span class="n" style="color: #333;">f</span></span>
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<pre style="margin: 0;">+<span id="LC218" class="line" lang="haskell"> <span class="n" style="color: #333;">fun_doc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ppr_id_occ</span> <span class="n" style="color: #333;">noParens</span> <span class="n" style="color: #333;">f</span></span>
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217
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219
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<pre style="margin: 0;"> <span id="LC219" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC220" 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;">parens</span> <span class="p">(</span><span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">pprParendExpr</span> <span class="n" style="color: #333;">fun</span><span class="p">)</span> <span class="mi" style="color: #099;">2</span> <span class="n" style="color: #333;">pp_args</span><span class="p">)</span></span>
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219
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<pre style="margin: 0;"> <span id="LC221" class="line" lang="haskell"> <span class="p">}</span></span>
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<li id="11ffe98a94d798427bc600e4fcfe899407536346">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/716b67d9b0ce485e2bfb6951b5f0586af642cad8#11ffe98a94d798427bc600e4fcfe899407536346"><strong>compiler/GHC/Core/SimpleOpt.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">@@ -16,17 +16,14 @@ module GHC.Core.SimpleOpt (</td>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ** Predicates on expressions</span></span>
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17
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">exprIsConApp_maybe</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">exprIsLiteral_maybe</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">exprIsLambda_maybe</span><span class="p">,</span></span>
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18
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"></span>
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19
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<pre style="margin: 0;">-<span id="LC19" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ** Coercions and casts</span></span>
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<pre style="margin: 0;">-<span id="LC20" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">pushCoArg</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pushCoValArg</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pushCoTyArg</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">collectBindersPushingCo</span></span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"> <span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="n" style="color: #333;">include</span> <span class="s" style="color: #d14;">"HsVersions.h"</span></span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"></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;">GHC.Prelude</span></span>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="haskell"></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;">GHC.Core.Opt.Arity</span><span class="p">(</span> <span class="n" style="color: #333;">etaExpandToJoinPoint</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="LC25" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core</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;">GHC.Core.Opt.Arity</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;">GHC.Core.Subst</span></span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Utils</span></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;">GHC.Core.FVs</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">@@ -46,18 +43,14 @@ import GHC.Core.Coercion.Opt ( optCoercion )</td>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Type</span> <span class="k" style="font-weight: 600;">hiding</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">substTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">extendTvSubst</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">extendCvSubst</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">extendTvSubstList</span></span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isInScope</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">substTyVarBndr</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">cloneTyVarBndr</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Coercion</span> <span class="k" style="font-weight: 600;">hiding</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">substCo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">substCoVarBndr</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC49" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCon</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">tyConArity</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC50" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Multiplicity</span></span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Builtin.Types</span></span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Builtin.Names</span></span>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Basic</span></span>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Unit.Module</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Module</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Error</span></span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Driver.Session</span></span>
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<pre style="margin: 0;">-<span id="LC57" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Driver.Ppr</span></span>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Outputable</span></span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Panic</span></span>
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<pre style="margin: 0;">-<span id="LC60" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.Pair</span></span>
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Misc</span></span>
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.Maybe</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">orElse</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.FastString</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">@@ -756,6 +749,28 @@ a good cause. And it won't hurt other RULES and such that it comes across.</td>
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756
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<pre style="margin: 0;"> <span id="LC749" 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="LC750" 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="LC751" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC752" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Strictness and join points]</span></span>
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<pre style="margin: 0;">+<span id="LC753" 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="LC754" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Suppose we have</span></span>
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<pre style="margin: 0;">+<span id="LC755" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC756" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> let f = \x. if x>200 then e1 else e1</span></span>
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<pre style="margin: 0;">+<span id="LC757" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC758" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and we know that f is strict in x. Then if we subsequently</span></span>
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<pre style="margin: 0;">+<span id="LC759" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">discover that f is an arity-2 join point, we'll eta-expand it to</span></span>
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<pre style="margin: 0;">+<span id="LC760" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC761" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> let f = \x y. if x>200 then e1 else e1</span></span>
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762
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<pre style="margin: 0;">+<span id="LC762" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC763" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and now it's only strict if applied to two arguments. So we should</span></span>
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764
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<pre style="margin: 0;">+<span id="LC764" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">adjust the strictness info.</span></span>
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<pre style="margin: 0;">+<span id="LC766" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">A more common case is when</span></span>
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<pre style="margin: 0;">+<span id="LC768" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f = \x. error ".."</span></span>
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<pre style="margin: 0;">+<span id="LC769" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC770" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and again its arity increases (#15517)</span></span>
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<pre style="margin: 0;">+<span id="LC771" 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="LC774" class="line" lang="haskell"><span class="cd">-- | Returns Just (bndr,rhs) if the binding is a join point:</span></span>
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<pre style="margin: 0;"> <span id="LC775" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If it's a JoinId, just return it</span></span>
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<pre style="margin: 0;"> <span id="LC776" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If it's not yet a JoinId but is always tail-called,</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">@@ -789,27 +804,6 @@ joinPointBindings_maybe bndrs</td>
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<pre style="margin: 0;"> <span id="LC804" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">uncurry</span> <span class="n" style="color: #333;">joinPointBinding_maybe</span><span class="p">)</span> <span class="n" style="color: #333;">bndrs</span></span>
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<pre style="margin: 0;"> <span id="LC805" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC806" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC792" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Strictness and join points]</span></span>
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<pre style="margin: 0;">-<span id="LC793" 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="LC794" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Suppose we have</span></span>
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<pre style="margin: 0;">-<span id="LC795" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC796" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> let f = \x. if x>200 then e1 else e1</span></span>
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<pre style="margin: 0;">-<span id="LC797" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC798" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and we know that f is strict in x. Then if we subsequently</span></span>
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<pre style="margin: 0;">-<span id="LC799" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">discover that f is an arity-2 join point, we'll eta-expand it to</span></span>
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<pre style="margin: 0;">-<span id="LC800" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC801" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> let f = \x y. if x>200 then e1 else e1</span></span>
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<pre style="margin: 0;">-<span id="LC802" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC803" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and now it's only strict if applied to two arguments. So we should</span></span>
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<pre style="margin: 0;">-<span id="LC804" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">adjust the strictness info.</span></span>
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<pre style="margin: 0;">-<span id="LC805" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC806" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">A more common case is when</span></span>
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<pre style="margin: 0;">-<span id="LC807" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC808" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f = \x. error ".."</span></span>
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<pre style="margin: 0;">-<span id="LC809" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC810" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and again its arity increases (#15517)</span></span>
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<pre style="margin: 0;">-<span id="LC811" 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="LC812" class="line" lang="haskell"></span>
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813
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<pre style="margin: 0;"> <span id="LC807" 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="LC808" 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="LC809" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> exprIsConApp_maybe</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1324" 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">@@ -1324,275 +1318,3 @@ exprIsLambda_maybe _ _e</td>
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1324
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<pre style="margin: 0;"> <span id="LC1318" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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1325
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1319
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<pre style="margin: 0;"> <span id="LC1319" class="line" lang="haskell"></span>
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1326
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1320
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<pre style="margin: 0;"> <span id="LC1320" class="line" lang="haskell"></span></pre>
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1327
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<pre style="margin: 0;">-<span id="LC1327" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *********************************************************************</span></span>
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1328
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<pre style="margin: 0;">-<span id="LC1328" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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1329
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<pre style="margin: 0;">-<span id="LC1329" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The "push rules"</span></span>
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1330
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<pre style="margin: 0;">-<span id="LC1330" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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1331
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<pre style="margin: 0;">-<span id="LC1331" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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1332
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<pre style="margin: 0;">-<span id="LC1332" class="line" lang="haskell"></span>
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1333
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<pre style="margin: 0;">-<span id="LC1333" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here we implement the "push rules" from FC papers:</span></span>
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1334
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<pre style="margin: 0;">-<span id="LC1334" class="line" lang="haskell"></span>
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1335
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<pre style="margin: 0;">-<span id="LC1335" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* The push-argument rules, where we can move a coercion past an argument.</span></span>
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1336
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<pre style="margin: 0;">-<span id="LC1336" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We have</span></span>
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<pre style="margin: 0;">-<span id="LC1337" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (fun |> co) arg</span></span>
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<pre style="margin: 0;">-<span id="LC1338" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> and we want to transform it to</span></span>
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1339
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<pre style="margin: 0;">-<span id="LC1339" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (fun arg') |> co'</span></span>
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<pre style="margin: 0;">-<span id="LC1340" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> for some suitable co' and transformed arg'.</span></span>
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1341
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<pre style="margin: 0;">-<span id="LC1341" class="line" lang="haskell"></span>
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1342
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<pre style="margin: 0;">-<span id="LC1342" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* The PushK rule for data constructors. We have</span></span>
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1343
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<pre style="margin: 0;">-<span id="LC1343" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (K e1 .. en) |> co</span></span>
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1344
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<pre style="margin: 0;">-<span id="LC1344" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> and we want to transform to</span></span>
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<pre style="margin: 0;">-<span id="LC1345" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (K e1' .. en')</span></span>
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1346
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<pre style="margin: 0;">-<span id="LC1346" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> by pushing the coercion into the arguments</span></span>
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1347
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<pre style="margin: 0;">-<span id="LC1347" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1348
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<pre style="margin: 0;">-<span id="LC1348" class="line" lang="haskell"></span>
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1349
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<pre style="margin: 0;">-<span id="LC1349" class="line" lang="haskell"><span class="n" style="color: #333;">pushCoArgs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CoercionR</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoreArg</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></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;">CoreArg</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">MCoercion</span><span class="p">)</span></span>
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1350
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<pre style="margin: 0;">-<span id="LC1350" class="line" lang="haskell"><span class="n" style="color: #333;">pushCoArgs</span> <span class="n" style="color: #333;">co</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">[]</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>
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1351
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<pre style="margin: 0;">-<span id="LC1351" class="line" lang="haskell"><span class="n" style="color: #333;">pushCoArgs</span> <span class="n" style="color: #333;">co</span> <span class="p">(</span><span class="n" style="color: #333;">arg</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">args</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">arg'</span><span class="p">,</span> <span class="n" style="color: #333;">m_co1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pushCoArg</span> <span class="n" style="color: #333;">co</span> <span class="n" style="color: #333;">arg</span></span>
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1352
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<pre style="margin: 0;">-<span id="LC1352" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">m_co1</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1353
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<pre style="margin: 0;">-<span id="LC1353" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MCo</span> <span class="n" style="color: #333;">co1</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">args'</span><span class="p">,</span> <span class="n" style="color: #333;">m_co2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pushCoArgs</span> <span class="n" style="color: #333;">co1</span> <span class="n" style="color: #333;">args</span></span>
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1354
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<pre style="margin: 0;">-<span id="LC1354" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">arg'</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">args'</span><span class="p">,</span> <span class="n" style="color: #333;">m_co2</span><span class="p">)</span> <span class="p">}</span></span>
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1355
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<pre style="margin: 0;">-<span id="LC1355" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MRefl</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">arg'</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">args</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">MRefl</span><span class="p">)</span> <span class="p">}</span></span>
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1356
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<pre style="margin: 0;">-<span id="LC1356" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1357" class="line" lang="haskell"><span class="n" style="color: #333;">pushCoArg</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CoercionR</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreArg</span> <span class="o" style="font-weight: 600;">-></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;">CoreArg</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">MCoercion</span><span class="p">)</span></span>
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1358
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<pre style="margin: 0;">-<span id="LC1358" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We have (fun |> co) arg, and we want to transform it to</span></span>
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1359
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<pre style="margin: 0;">-<span id="LC1359" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (fun arg) |> co</span></span>
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1360
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<pre style="margin: 0;">-<span id="LC1360" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This may fail, e.g. if (fun :: N) where N is a newtype</span></span>
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1361
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<pre style="margin: 0;">-<span id="LC1361" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- C.f. simplCast in GHC.Core.Opt.Simplify</span></span>
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1362
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<pre style="margin: 0;">-<span id="LC1362" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'co' is always Representational</span></span>
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1363
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<pre style="margin: 0;">-<span id="LC1363" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If the returned coercion is Nothing, then it would have been reflexive</span></span>
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1364
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<pre style="margin: 0;">-<span id="LC1364" class="line" lang="haskell"><span class="n" style="color: #333;">pushCoArg</span> <span class="n" style="color: #333;">co</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">ty'</span><span class="p">,</span> <span class="n" style="color: #333;">m_co'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pushCoTyArg</span> <span class="n" style="color: #333;">co</span> <span class="n" style="color: #333;">ty</span></span>
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1365
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<pre style="margin: 0;">-<span id="LC1365" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="n" style="color: #333;">ty'</span><span class="p">,</span> <span class="n" style="color: #333;">m_co'</span><span class="p">)</span> <span class="p">}</span></span>
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1366
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<pre style="margin: 0;">-<span id="LC1366" class="line" lang="haskell"><span class="n" style="color: #333;">pushCoArg</span> <span class="n" style="color: #333;">co</span> <span class="n" style="color: #333;">val_arg</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">arg_co</span><span class="p">,</span> <span class="n" style="color: #333;">m_co'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pushCoValArg</span> <span class="n" style="color: #333;">co</span></span>
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1367
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<pre style="margin: 0;">-<span id="LC1367" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">val_arg</span> <span class="p">`</span><span class="n" style="color: #333;">mkCast</span><span class="p">`</span> <span class="n" style="color: #333;">arg_co</span><span class="p">,</span> <span class="n" style="color: #333;">m_co'</span><span class="p">)</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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1369
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<pre style="margin: 0;">-<span id="LC1369" class="line" lang="haskell"><span class="n" style="color: #333;">pushCoTyArg</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CoercionR</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;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">MCoercionR</span><span class="p">)</span></span>
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1370
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<pre style="margin: 0;">-<span id="LC1370" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We have (fun |> co) @ty</span></span>
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1371
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<pre style="margin: 0;">-<span id="LC1371" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Push the coercion through to return</span></span>
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1372
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<pre style="margin: 0;">-<span id="LC1372" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (fun @ty') |> co'</span></span>
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1373
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<pre style="margin: 0;">-<span id="LC1373" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'co' is always Representational</span></span>
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1374
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<pre style="margin: 0;">-<span id="LC1374" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If the returned coercion is Nothing, then it would have been reflexive;</span></span>
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1375
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<pre style="margin: 0;">-<span id="LC1375" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- it's faster not to compute it, though.</span></span>
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1376
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<pre style="margin: 0;">-<span id="LC1376" class="line" lang="haskell"><span class="n" style="color: #333;">pushCoTyArg</span> <span class="n" style="color: #333;">co</span> <span class="n" style="color: #333;">ty</span></span>
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1377
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<pre style="margin: 0;">-<span id="LC1377" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The following is inefficient - don't do `eqType` here, the coercion</span></span>
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1378
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<pre style="margin: 0;">-<span id="LC1378" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- optimizer will take care of it. See #14737.</span></span>
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1379
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<pre style="margin: 0;">-<span id="LC1379" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- -- | tyL `eqType` tyR</span></span>
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1380
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<pre style="margin: 0;">-<span id="LC1380" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- -- = Just (ty, Nothing)</span></span>
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1381
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<pre style="margin: 0;">-<span id="LC1381" class="line" lang="haskell"></span>
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1382
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<pre style="margin: 0;">-<span id="LC1382" class="line" lang="haskell"> <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>
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<td class="diff-line-num old old_line" data-linenumber="1383" 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">
1383
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<pre style="margin: 0;">-<span id="LC1383" 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="kt" style="color: #458; font-weight: 600;">MRefl</span><span class="p">)</span></span>
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1384
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<pre style="margin: 0;">-<span id="LC1384" class="line" lang="haskell"></span>
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1385
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<pre style="margin: 0;">-<span id="LC1385" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isForAllTy_ty</span> <span class="n" style="color: #333;">tyL</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1386" 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">
1386
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<td class="diff-line-num new_line old" data-linenumber="1321" 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="LC1386" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT2</span><span class="p">(</span> <span class="n" style="color: #333;">isForAllTy_ty</span> <span class="n" style="color: #333;">tyR</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="n" style="color: #333;">ty</span> <span class="p">)</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1387" 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">
1387
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<td class="diff-line-num new_line old" data-linenumber="1321" 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="LC1387" class="line" lang="haskell"> <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;">mkCastTy</span><span class="p">`</span> <span class="n" style="color: #333;">co1</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">MCo</span> <span class="n" style="color: #333;">co2</span><span class="p">)</span></span>
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1388
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<pre style="margin: 0;">-<span id="LC1388" class="line" lang="haskell"></span>
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1389
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<td class="diff-line-num new_line old" data-linenumber="1321" 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="LC1389" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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1390
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<td class="diff-line-num new_line old" data-linenumber="1321" 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="LC1390" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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1391
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<pre style="margin: 0;">-<span id="LC1391" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1392" 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">
1392
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<td class="diff-line-num new_line old" data-linenumber="1321" 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="LC1392" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Pair</span> <span class="n" style="color: #333;">tyL</span> <span class="n" style="color: #333;">tyR</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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1393
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<pre style="margin: 0;">-<span id="LC1393" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- co :: tyL ~ tyR</span></span>
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1394
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<pre style="margin: 0;">-<span id="LC1394" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- tyL = forall (a1 :: k1). ty1</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1395" 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">
1395
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<pre style="margin: 0;">-<span id="LC1395" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- tyR = forall (a2 :: k2). ty2</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1396" 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">
1396
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<pre style="margin: 0;">-<span id="LC1396" class="line" lang="haskell"></span>
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<td class="diff-line-num old old_line" data-linenumber="1397" 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">
1397
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<pre style="margin: 0;">-<span id="LC1397" 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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<td class="diff-line-num old old_line" data-linenumber="1398" 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">
1398
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<td class="diff-line-num new_line old" data-linenumber="1321" 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="LC1398" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- co1 :: k2 ~N k1</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1399" 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">
1399
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<td class="diff-line-num new_line old" data-linenumber="1321" 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="LC1399" 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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1400
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<pre style="margin: 0;">-<span id="LC1400" 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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1401
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<pre style="margin: 0;">-<span id="LC1401" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See the NthCo case in GHC.Core.Lint.</span></span>
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1402
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<pre style="margin: 0;">-<span id="LC1402" class="line" lang="haskell"></span>
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1403
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<pre style="margin: 0;">-<span id="LC1403" 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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1404
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<pre style="margin: 0;">-<span id="LC1404" 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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1405
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<pre style="margin: 0;">-<span id="LC1405" 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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1406
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<pre style="margin: 0;">-<span id="LC1406" class="line" lang="haskell"></span>
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1407
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<pre style="margin: 0;">-<span id="LC1407" class="line" lang="haskell"><span class="n" style="color: #333;">pushCoValArg</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CoercionR</span> <span class="o" style="font-weight: 600;">-></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;">Coercion</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">MCoercion</span><span class="p">)</span></span>
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1408
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<pre style="margin: 0;">-<span id="LC1408" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We have (fun |> co) arg</span></span>
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1409
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<pre style="margin: 0;">-<span id="LC1409" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Push the coercion through to return</span></span>
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1410
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<pre style="margin: 0;">-<span id="LC1410" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (fun (arg |> co_arg)) |> co_res</span></span>
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1411
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<pre style="margin: 0;">-<span id="LC1411" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'co' is always Representational</span></span>
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1412
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<pre style="margin: 0;">-<span id="LC1412" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If the second returned Coercion is actually Nothing, then no cast is necessary;</span></span>
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1413
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<pre style="margin: 0;">-<span id="LC1413" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the returned coercion would have been reflexive.</span></span>
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1414
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<pre style="margin: 0;">-<span id="LC1414" class="line" lang="haskell"><span class="n" style="color: #333;">pushCoValArg</span> <span class="n" style="color: #333;">co</span></span>
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1415
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<pre style="margin: 0;">-<span id="LC1415" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The following is inefficient - don't do `eqType` here, the coercion</span></span>
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1416
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<pre style="margin: 0;">-<span id="LC1416" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- optimizer will take care of it. See #14737.</span></span>
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1417
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<pre style="margin: 0;">-<span id="LC1417" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- -- | tyL `eqType` tyR</span></span>
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1418
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<pre style="margin: 0;">-<span id="LC1418" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- -- = Just (mkRepReflCo arg, Nothing)</span></span>
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1419
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<pre style="margin: 0;">-<span id="LC1419" class="line" lang="haskell"></span>
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1420
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<pre style="margin: 0;">-<span id="LC1420" class="line" lang="haskell"> <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>
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1421
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<pre style="margin: 0;">-<span id="LC1421" 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;">mkRepReflCo</span> <span class="n" style="color: #333;">arg</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">MRefl</span><span class="p">)</span></span>
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1422
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<pre style="margin: 0;">-<span id="LC1422" class="line" lang="haskell"></span>
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1423
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<pre style="margin: 0;">-<span id="LC1423" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isFunTy</span> <span class="n" style="color: #333;">tyL</span></span>
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<pre style="margin: 0;">-<span id="LC1424" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">co_mult</span><span class="p">,</span> <span class="n" style="color: #333;">co1</span><span class="p">,</span> <span class="n" style="color: #333;">co2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">decomposeFunCo</span> <span class="kt" style="color: #458; font-weight: 600;">Representational</span> <span class="n" style="color: #333;">co</span></span>
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1425
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<pre style="margin: 0;">-<span id="LC1425" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">isReflexiveCo</span> <span class="n" style="color: #333;">co_mult</span></span>
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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;">-- We can't push the coercion in the case where co_mult isn't reflexivity:</span></span>
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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;">-- it could be an unsafe axiom, and losing this information could yield</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1428" 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">
1428
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<pre style="margin: 0;">-<span id="LC1428" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ill-typed terms. For instance (fun x ::(1) Int -> (fun _ -> () |> co) x)</span></span>
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1429
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<pre style="margin: 0;">-<span id="LC1429" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- with co :: (Int -> ()) ~ (Int #-> ()), would reduce to (fun x ::(1) Int</span></span>
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1430
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<pre style="margin: 0;">-<span id="LC1430" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- -> (fun _ ::(Many) Int -> ()) x) which is ill-typed</span></span>
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1431
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<pre style="margin: 0;">-<span id="LC1431" class="line" lang="haskell"></span>
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<td class="diff-line-num old old_line" data-linenumber="1432" 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">
1432
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<pre style="margin: 0;">-<span id="LC1432" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If co :: (tyL1 -> tyL2) ~ (tyR1 -> tyR2)</span></span>
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1433
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<pre style="margin: 0;">-<span id="LC1433" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- then co1 :: tyL1 ~ tyR1</span></span>
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1434
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<pre style="margin: 0;">-<span id="LC1434" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- co2 :: tyL2 ~ tyR2</span></span>
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1435
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<pre style="margin: 0;">-<span id="LC1435" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT2</span><span class="p">(</span> <span class="n" style="color: #333;">isFunTy</span> <span class="n" style="color: #333;">tyR</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="n" style="color: #333;">arg</span> <span class="p">)</span></span>
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1436
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<pre style="margin: 0;">-<span id="LC1436" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">mkSymCo</span> <span class="n" style="color: #333;">co1</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">MCo</span> <span class="n" style="color: #333;">co2</span><span class="p">)</span></span>
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1437
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<pre style="margin: 0;">-<span id="LC1437" class="line" lang="haskell"></span>
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1438
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<pre style="margin: 0;">-<span id="LC1438" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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1439
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<pre style="margin: 0;">-<span id="LC1439" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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1440
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<pre style="margin: 0;">-<span id="LC1440" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1441
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<pre style="margin: 0;">-<span id="LC1441" class="line" lang="haskell"> <span class="n" style="color: #333;">arg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">funArgTy</span> <span class="n" style="color: #333;">tyR</span></span>
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1442
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<pre style="margin: 0;">-<span id="LC1442" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Pair</span> <span class="n" style="color: #333;">tyL</span> <span class="n" style="color: #333;">tyR</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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1443
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<pre style="margin: 0;">-<span id="LC1443" class="line" lang="haskell"></span>
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1444
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<pre style="margin: 0;">-<span id="LC1444" class="line" lang="haskell"><span class="n" style="color: #333;">pushCoercionIntoLambda</span></span>
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1445
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<pre style="margin: 0;">-<span id="LC1445" class="line" lang="haskell"> <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="kt" style="color: #458; font-weight: 600;">Var</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoercionR</span> <span class="o" style="font-weight: 600;">-></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;">Var</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</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="c1" style="color: #998; font-style: italic;">-- This implements the Push rule from the paper on coercions</span></span>
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1447
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<pre style="margin: 0;">-<span id="LC1447" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (\x. e) |> 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="c1" style="color: #998; font-style: italic;">-- ===></span></span>
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1449
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<pre style="margin: 0;">-<span id="LC1449" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (\x'. e |> co')</span></span>
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1450
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<pre style="margin: 0;">-<span id="LC1450" class="line" lang="haskell"><span class="n" style="color: #333;">pushCoercionIntoLambda</span> <span class="n" style="color: #333;">in_scope</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">co</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1451" 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">
1451
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<pre style="margin: 0;">-<span id="LC1451" 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;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isTyVar</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isCoVar</span> <span class="n" style="color: #333;">x</span><span class="p">))</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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1452
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<pre style="margin: 0;">-<span id="LC1452" 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;">s1s2</span> <span class="n" style="color: #333;">t1t2</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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<td class="diff-line-num old old_line" data-linenumber="1453" 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">
1453
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<pre style="margin: 0;">-<span id="LC1453" 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="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">_s1</span><span class="p">,</span><span class="n" style="color: #333;">_s2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitFunTy_maybe</span> <span class="n" style="color: #333;">s1s2</span></span>
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1454
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<pre style="margin: 0;">-<span id="LC1454" 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;">w1</span><span class="p">,</span> <span class="n" style="color: #333;">t1</span><span class="p">,</span><span class="n" style="color: #333;">_t2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitFunTy_maybe</span> <span class="n" style="color: #333;">t1t2</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1455" 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">
1455
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<pre style="margin: 0;">-<span id="LC1455" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">co_mult</span><span class="p">,</span> <span class="n" style="color: #333;">co1</span><span class="p">,</span> <span class="n" style="color: #333;">co2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">decomposeFunCo</span> <span class="kt" style="color: #458; font-weight: 600;">Representational</span> <span class="n" style="color: #333;">co</span></span>
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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;">isReflexiveCo</span> <span class="n" style="color: #333;">co_mult</span></span>
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1457
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<pre style="margin: 0;">-<span id="LC1457" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We can't push the coercion in the case where co_mult isn't</span></span>
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1458
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<pre style="margin: 0;">-<span id="LC1458" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- reflexivity. See pushCoValArg for more details.</span></span>
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1459
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<pre style="margin: 0;">-<span id="LC1459" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">let</span></span>
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1460
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<pre style="margin: 0;">-<span id="LC1460" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Should we optimize the coercions here?</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;">-- Otherwise they might not match too well</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;">x'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">x</span> <span class="p">`</span><span class="n" style="color: #333;">setIdType</span><span class="p">`</span> <span class="n" style="color: #333;">t1</span> <span class="p">`</span><span class="n" style="color: #333;">setIdMult</span><span class="p">`</span> <span class="n" style="color: #333;">w1</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1463" 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">
1463
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<pre style="margin: 0;">-<span id="LC1463" class="line" lang="haskell"> <span class="n" style="color: #333;">in_scope'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">in_scope</span> <span class="p">`</span><span class="n" style="color: #333;">extendInScopeSet</span><span class="p">`</span> <span class="n" style="color: #333;">x'</span></span>
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1464
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<pre style="margin: 0;">-<span id="LC1464" class="line" lang="haskell"> <span class="n" style="color: #333;">subst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendIdSubst</span> <span class="p">(</span><span class="n" style="color: #333;">mkEmptySubst</span> <span class="n" style="color: #333;">in_scope'</span><span class="p">)</span></span>
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1465
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<pre style="margin: 0;">-<span id="LC1465" class="line" lang="haskell"> <span class="n" style="color: #333;">x</span></span>
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1466
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<pre style="margin: 0;">-<span id="LC1466" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mkCast</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">x'</span><span class="p">)</span> <span class="n" style="color: #333;">co1</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="kr" style="font-weight: 600;">in</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">x'</span><span class="p">,</span> <span class="n" style="color: #333;">substExpr</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">e</span> <span class="p">`</span><span class="n" style="color: #333;">mkCast</span><span class="p">`</span> <span class="n" style="color: #333;">co2</span><span class="p">)</span></span>
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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="n" style="color: #333;">otherwise</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="n" style="color: #333;">pprTrace</span> <span class="s" style="color: #d14;">"exprIsLambda_maybe: Unexpected lambda in case"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Lam</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span><span class="p">))</span></span>
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1470
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<pre style="margin: 0;">-<span id="LC1470" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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1471
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<pre style="margin: 0;">-<span id="LC1471" class="line" lang="haskell"></span>
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1472
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<pre style="margin: 0;">-<span id="LC1472" class="line" lang="haskell"><span class="n" style="color: #333;">pushCoDataCon</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DataCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">]</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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1473
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<pre style="margin: 0;">-<span id="LC1473" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></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;">DataCon</span></span>
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1474
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<pre style="margin: 0;">-<span id="LC1474" class="line" lang="haskell"> <span class="p">,</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;">-- Universal type args</span></span>
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1475
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<pre style="margin: 0;">-<span id="LC1475" class="line" lang="haskell"> <span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">])</span> <span class="c1" style="color: #998; font-style: italic;">-- All other args incl existentials</span></span>
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1476
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<pre style="margin: 0;">-<span id="LC1476" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Implement the KPush reduction rule as described in "Down with kinds"</span></span>
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1477
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<pre style="margin: 0;">-<span id="LC1477" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The transformation applies iff we have</span></span>
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1478
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<pre style="margin: 0;">-<span id="LC1478" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (C e1 ... en) `cast` co</span></span>
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1479
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<pre style="margin: 0;">-<span id="LC1479" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- where co :: (T t1 .. tn) ~ to_ty</span></span>
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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;">-- The left-hand one must be a T, because exprIsConApp returned True</span></span>
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1481
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<pre style="margin: 0;">-<span id="LC1481" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- but the right-hand one might not be. (Though it usually will.)</span></span>
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1482
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<pre style="margin: 0;">-<span id="LC1482" class="line" lang="haskell"><span class="n" style="color: #333;">pushCoDataCon</span> <span class="n" style="color: #333;">dc</span> <span class="n" style="color: #333;">dc_args</span> <span class="n" style="color: #333;">co</span></span>
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1483
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<pre style="margin: 0;">-<span id="LC1483" class="line" lang="haskell"> <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;">from_ty</span> <span class="p">`</span><span class="n" style="color: #333;">eqType</span><span class="p">`</span> <span class="n" style="color: #333;">to_ty</span> <span class="c1" style="color: #998; font-style: italic;">-- try cheap test first</span></span>
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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="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">univ_ty_args</span><span class="p">,</span> <span class="n" style="color: #333;">rest_args</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitAtList</span> <span class="p">(</span><span class="n" style="color: #333;">dataConUnivTyVars</span> <span class="n" style="color: #333;">dc</span><span class="p">)</span> <span class="n" style="color: #333;">dc_args</span></span>
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1485
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<pre style="margin: 0;">-<span id="LC1485" 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;">dc</span><span class="p">,</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">exprToType</span> <span class="n" style="color: #333;">univ_ty_args</span><span class="p">,</span> <span class="n" style="color: #333;">rest_args</span><span class="p">)</span></span>
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1486
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<pre style="margin: 0;">-<span id="LC1486" class="line" lang="haskell"></span>
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1487
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<pre style="margin: 0;">-<span id="LC1487" 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;">to_tc</span><span class="p">,</span> <span class="n" style="color: #333;">to_tc_arg_tys</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;">to_ty</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;">to_tc</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">dataConTyCon</span> <span class="n" style="color: #333;">dc</span></span>
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<pre style="margin: 0;">-<span id="LC1489" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- These two tests can fail; we might see</span></span>
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<pre style="margin: 0;">-<span id="LC1490" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (C x y) `cast` (g :: T a ~ S [a]),</span></span>
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1491
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<pre style="margin: 0;">-<span id="LC1491" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- where S is a type function. In fact, exprIsConApp</span></span>
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1492
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<pre style="margin: 0;">-<span id="LC1492" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- will probably not be called in such circumstances,</span></span>
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1493
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<pre style="margin: 0;">-<span id="LC1493" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- but there's nothing wrong with it</span></span>
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1494
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<pre style="margin: 0;">-<span id="LC1494" class="line" lang="haskell"></span>
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1495
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<pre style="margin: 0;">-<span id="LC1495" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">let</span></span>
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1496
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<pre style="margin: 0;">-<span id="LC1496" class="line" lang="haskell"> <span class="n" style="color: #333;">tc_arity</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyConArity</span> <span class="n" style="color: #333;">to_tc</span></span>
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<pre style="margin: 0;">-<span id="LC1497" class="line" lang="haskell"> <span class="n" style="color: #333;">dc_univ_tyvars</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dataConUnivTyVars</span> <span class="n" style="color: #333;">dc</span></span>
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1498
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<pre style="margin: 0;">-<span id="LC1498" class="line" lang="haskell"> <span class="n" style="color: #333;">dc_ex_tcvars</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dataConExTyCoVars</span> <span class="n" style="color: #333;">dc</span></span>
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1499
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<pre style="margin: 0;">-<span id="LC1499" class="line" lang="haskell"> <span class="n" style="color: #333;">arg_tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dataConRepArgTys</span> <span class="n" style="color: #333;">dc</span></span>
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1500
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<pre style="margin: 0;">-<span id="LC1500" class="line" lang="haskell"></span>
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1501
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<pre style="margin: 0;">-<span id="LC1501" class="line" lang="haskell"> <span class="n" style="color: #333;">non_univ_args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dropList</span> <span class="n" style="color: #333;">dc_univ_tyvars</span> <span class="n" style="color: #333;">dc_args</span></span>
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1502
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<pre style="margin: 0;">-<span id="LC1502" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ex_args</span><span class="p">,</span> <span class="n" style="color: #333;">val_args</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitAtList</span> <span class="n" style="color: #333;">dc_ex_tcvars</span> <span class="n" style="color: #333;">non_univ_args</span></span>
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1503
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<pre style="margin: 0;">-<span id="LC1503" class="line" lang="haskell"></span>
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1504
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<pre style="margin: 0;">-<span id="LC1504" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Make the "Psi" from the paper</span></span>
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1505
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<pre style="margin: 0;">-<span id="LC1505" class="line" lang="haskell"> <span class="n" style="color: #333;">omegas</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">decomposeCo</span> <span class="n" style="color: #333;">tc_arity</span> <span class="n" style="color: #333;">co</span> <span class="p">(</span><span class="n" style="color: #333;">tyConRolesRepresentational</span> <span class="n" style="color: #333;">to_tc</span><span class="p">)</span></span>
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1506
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<pre style="margin: 0;">-<span id="LC1506" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">psi_subst</span><span class="p">,</span> <span class="n" style="color: #333;">to_ex_arg_tys</span><span class="p">)</span></span>
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1507
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<pre style="margin: 0;">-<span id="LC1507" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">liftCoSubstWithEx</span> <span class="kt" style="color: #458; font-weight: 600;">Representational</span></span>
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<pre style="margin: 0;">-<span id="LC1508" class="line" lang="haskell"> <span class="n" style="color: #333;">dc_univ_tyvars</span></span>
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<pre style="margin: 0;">-<span id="LC1509" class="line" lang="haskell"> <span class="n" style="color: #333;">omegas</span></span>
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<pre style="margin: 0;">-<span id="LC1510" class="line" lang="haskell"> <span class="n" style="color: #333;">dc_ex_tcvars</span></span>
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1511
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<pre style="margin: 0;">-<span id="LC1511" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">exprToType</span> <span class="n" style="color: #333;">ex_args</span><span class="p">)</span></span>
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1512
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<pre style="margin: 0;">-<span id="LC1512" class="line" lang="haskell"></span>
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1513
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<pre style="margin: 0;">-<span id="LC1513" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Cast the value arguments (which include dictionaries)</span></span>
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1514
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<pre style="margin: 0;">-<span id="LC1514" class="line" lang="haskell"> <span class="n" style="color: #333;">new_val_args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">zipWith</span> <span class="n" style="color: #333;">cast_arg</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">scaledThing</span> <span class="n" style="color: #333;">arg_tys</span><span class="p">)</span> <span class="n" style="color: #333;">val_args</span></span>
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1515
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<pre style="margin: 0;">-<span id="LC1515" class="line" lang="haskell"> <span class="n" style="color: #333;">cast_arg</span> <span class="n" style="color: #333;">arg_ty</span> <span class="n" style="color: #333;">arg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkCast</span> <span class="n" style="color: #333;">arg</span> <span class="p">(</span><span class="n" style="color: #333;">psi_subst</span> <span class="n" style="color: #333;">arg_ty</span><span class="p">)</span></span>
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1516
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<pre style="margin: 0;">-<span id="LC1516" class="line" lang="haskell"></span>
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1517
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<pre style="margin: 0;">-<span id="LC1517" class="line" lang="haskell"> <span class="n" style="color: #333;">to_ex_args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="n" style="color: #333;">to_ex_arg_tys</span></span>
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1518
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<pre style="margin: 0;">-<span id="LC1518" class="line" lang="haskell"></span>
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1519
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<pre style="margin: 0;">-<span id="LC1519" class="line" lang="haskell"> <span class="n" style="color: #333;">dump_doc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">dc</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">dc_univ_tyvars</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">dc_ex_tcvars</span><span class="p">,</span></span>
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1520
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<pre style="margin: 0;">-<span id="LC1520" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">arg_tys</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">dc_args</span><span class="p">,</span></span>
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1521
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<pre style="margin: 0;">-<span id="LC1521" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ex_args</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">val_args</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">from_ty</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">to_ty</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">to_tc</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1522" 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">
1522
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<pre style="margin: 0;">-<span id="LC1522" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">to_tc</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">exprToType</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">takeList</span> <span class="n" style="color: #333;">dc_univ_tyvars</span> <span class="n" style="color: #333;">dc_args</span><span class="p">)</span> <span class="p">]</span></span>
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1523
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<pre style="margin: 0;">-<span id="LC1523" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span></span>
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1524
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<pre style="margin: 0;">-<span id="LC1524" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ASSERT2</span><span class="p">(</span> <span class="n" style="color: #333;">eqType</span> <span class="n" style="color: #333;">from_ty</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">to_tc</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">exprToType</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">takeList</span> <span class="n" style="color: #333;">dc_univ_tyvars</span> <span class="n" style="color: #333;">dc_args</span><span class="p">)),</span> <span class="n" style="color: #333;">dump_doc</span> <span class="p">)</span></span>
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1525
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<pre style="margin: 0;">-<span id="LC1525" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ASSERT2</span><span class="p">(</span> <span class="n" style="color: #333;">equalLength</span> <span class="n" style="color: #333;">val_args</span> <span class="n" style="color: #333;">arg_tys</span><span class="p">,</span> <span class="n" style="color: #333;">dump_doc</span> <span class="p">)</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1526" 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">
1526
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<pre style="margin: 0;">-<span id="LC1526" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">dc</span><span class="p">,</span> <span class="n" style="color: #333;">to_tc_arg_tys</span><span class="p">,</span> <span class="n" style="color: #333;">to_ex_args</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">new_val_args</span><span class="p">)</span></span>
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1527
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<pre style="margin: 0;">-<span id="LC1527" class="line" lang="haskell"></span>
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1528
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<pre style="margin: 0;">-<span id="LC1528" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1529" 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">
1529
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<pre style="margin: 0;">-<span id="LC1529" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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1530
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<pre style="margin: 0;">-<span id="LC1530" class="line" lang="haskell"></span>
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1531
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<pre style="margin: 0;">-<span id="LC1531" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1532
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<pre style="margin: 0;">-<span id="LC1532" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Pair</span> <span class="n" style="color: #333;">from_ty</span> <span class="n" style="color: #333;">to_ty</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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1533
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<pre style="margin: 0;">-<span id="LC1533" class="line" lang="haskell"></span>
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1534
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<pre style="margin: 0;">-<span id="LC1534" class="line" lang="haskell"><span class="n" style="color: #333;">collectBindersPushingCo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">Var</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">)</span></span>
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1535
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<td class="diff-line-num new_line old" data-linenumber="1321" 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="LC1535" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Collect lambda binders, pushing coercions inside if possible</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1536" 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">
1536
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<td class="diff-line-num new_line old" data-linenumber="1321" 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="LC1536" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- E.g. (\x.e) |> g g :: <Int> -> blah</span></span>
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1537
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<td class="diff-line-num new_line old" data-linenumber="1321" 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="LC1537" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- = (\x. e |> Nth 1 g)</span></span>
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1538
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<pre style="margin: 0;">-<span id="LC1538" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1539
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<td class="diff-line-num new_line old" data-linenumber="1321" 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="LC1539" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- That is,</span></span>
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1540
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<pre style="margin: 0;">-<span id="LC1540" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1541
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<pre style="margin: 0;">-<span id="LC1541" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- collectBindersPushingCo ((\x.e) |> g) === ([x], e |> Nth 1 g)</span></span>
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1542
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<pre style="margin: 0;">-<span id="LC1542" class="line" lang="haskell"><span class="n" style="color: #333;">collectBindersPushingCo</span> <span class="n" style="color: #333;">e</span></span>
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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;">go</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">e</span></span>
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1544
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<pre style="margin: 0;">-<span id="LC1544" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1545
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<td class="diff-line-num new_line old" data-linenumber="1321" 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="LC1545" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Peel off lambdas until we hit a cast.</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;">go</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Var</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">Var</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">)</span></span>
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1547
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<pre style="margin: 0;">-<span id="LC1547" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The accumulator is in reverse order</span></span>
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1548
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<pre style="margin: 0;">-<span id="LC1548" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">bs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Lam</span> <span class="n" style="color: #333;">b</span> <span class="n" style="color: #333;">e</span><span class="p">)</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;">b</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">bs</span><span class="p">)</span> <span class="n" style="color: #333;">e</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1549" 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">
1549
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<pre style="margin: 0;">-<span id="LC1549" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">bs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Cast</span> <span class="n" style="color: #333;">e</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_c</span> <span class="n" style="color: #333;">bs</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">co</span></span>
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1550
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<pre style="margin: 0;">-<span id="LC1550" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">bs</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">reverse</span> <span class="n" style="color: #333;">bs</span><span class="p">,</span> <span class="n" style="color: #333;">e</span><span class="p">)</span></span>
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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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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;">-- We are in a cast; peel off casts until we hit a lambda.</span></span>
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1553
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<pre style="margin: 0;">-<span id="LC1553" class="line" lang="haskell"> <span class="n" style="color: #333;">go_c</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Var</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoercionR</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">Var</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">)</span></span>
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1554
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<pre style="margin: 0;">-<span id="LC1554" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (go_c bs e c) is same as (go bs e (e |> c))</span></span>
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1555
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<pre style="margin: 0;">-<span id="LC1555" class="line" lang="haskell"> <span class="n" style="color: #333;">go_c</span> <span class="n" style="color: #333;">bs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Cast</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">co1</span><span class="p">)</span> <span class="n" style="color: #333;">co2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go_c</span> <span class="n" style="color: #333;">bs</span> <span class="n" style="color: #333;">e</span> <span class="p">(</span><span class="n" style="color: #333;">co1</span> <span class="p">`</span><span class="n" style="color: #333;">mkTransCo</span><span class="p">`</span> <span class="n" style="color: #333;">co2</span><span class="p">)</span></span>
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1556
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<pre style="margin: 0;">-<span id="LC1556" class="line" lang="haskell"> <span class="n" style="color: #333;">go_c</span> <span class="n" style="color: #333;">bs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Lam</span> <span class="n" style="color: #333;">b</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go_lam</span> <span class="n" style="color: #333;">bs</span> <span class="n" style="color: #333;">b</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">co</span></span>
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1557
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<pre style="margin: 0;">-<span id="LC1557" class="line" lang="haskell"> <span class="n" style="color: #333;">go_c</span> <span class="n" style="color: #333;">bs</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">reverse</span> <span class="n" style="color: #333;">bs</span><span class="p">,</span> <span class="n" style="color: #333;">mkCast</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>
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1558
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<pre style="margin: 0;">-<span id="LC1558" class="line" lang="haskell"></span>
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1559
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<td class="diff-line-num new_line old" data-linenumber="1321" 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="LC1559" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We are in a lambda under a cast; peel off lambdas and build a</span></span>
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1560
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<pre style="margin: 0;">-<span id="LC1560" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- new coercion for the body.</span></span>
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1561
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<pre style="margin: 0;">-<span id="LC1561" class="line" lang="haskell"> <span class="n" style="color: #333;">go_lam</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Var</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoercionR</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">Var</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">)</span></span>
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1562
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<pre style="margin: 0;">-<span id="LC1562" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (go_lam bs b e c) is same as (go_c bs (\b.e) c)</span></span>
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1563
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<pre style="margin: 0;">-<span id="LC1563" class="line" lang="haskell"> <span class="n" style="color: #333;">go_lam</span> <span class="n" style="color: #333;">bs</span> <span class="n" style="color: #333;">b</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">co</span></span>
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1564
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<pre style="margin: 0;">-<span id="LC1564" 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;">b</span></span>
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1565
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<pre style="margin: 0;">-<span id="LC1565" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="kt" style="color: #458; font-weight: 600;">Pair</span> <span class="n" style="color: #333;">tyL</span> <span class="n" style="color: #333;">tyR</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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1566
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<pre style="margin: 0;">-<span id="LC1566" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">isForAllTy_ty</span> <span class="n" style="color: #333;">tyL</span> <span class="p">)</span></span>
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1567
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<pre style="margin: 0;">-<span id="LC1567" class="line" lang="haskell"> <span class="n" style="color: #333;">isForAllTy_ty</span> <span class="n" style="color: #333;">tyR</span></span>
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1568
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<pre style="margin: 0;">-<span id="LC1568" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">isReflCo</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 class="c1" style="color: #998; font-style: italic;">-- See Note [collectBindersPushingCo]</span></span>
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1569
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<pre style="margin: 0;">-<span id="LC1569" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go_c</span> <span class="p">(</span><span class="n" style="color: #333;">b</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">bs</span><span class="p">)</span> <span class="n" style="color: #333;">e</span> <span class="p">(</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;">mkNomReflCo</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">b</span><span class="p">)))</span></span>
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1570
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<pre style="margin: 0;">-<span id="LC1570" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1571" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isCoVar</span> <span class="n" style="color: #333;">b</span></span>
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1572
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<pre style="margin: 0;">-<span id="LC1572" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="kt" style="color: #458; font-weight: 600;">Pair</span> <span class="n" style="color: #333;">tyL</span> <span class="n" style="color: #333;">tyR</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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1573
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<pre style="margin: 0;">-<span id="LC1573" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">isForAllTy_co</span> <span class="n" style="color: #333;">tyL</span> <span class="p">)</span></span>
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1574
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<pre style="margin: 0;">-<span id="LC1574" class="line" lang="haskell"> <span class="n" style="color: #333;">isForAllTy_co</span> <span class="n" style="color: #333;">tyR</span></span>
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1575
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<pre style="margin: 0;">-<span id="LC1575" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">isReflCo</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 class="c1" style="color: #998; font-style: italic;">-- See Note [collectBindersPushingCo]</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1576" 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">
1576
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<td class="diff-line-num new_line old" data-linenumber="1321" 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="LC1576" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">cov</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkCoVarCo</span> <span class="n" style="color: #333;">b</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1577" 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">
1577
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<td class="diff-line-num new_line old" data-linenumber="1321" 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="LC1577" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go_c</span> <span class="p">(</span><span class="n" style="color: #333;">b</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">bs</span><span class="p">)</span> <span class="n" style="color: #333;">e</span> <span class="p">(</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;">mkNomReflCo</span> <span class="p">(</span><span class="n" style="color: #333;">mkCoercionTy</span> <span class="n" style="color: #333;">cov</span><span class="p">)))</span></span>
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1578
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<pre style="margin: 0;">-<span id="LC1578" class="line" lang="haskell"></span>
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1579
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<pre style="margin: 0;">-<span id="LC1579" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isId</span> <span class="n" style="color: #333;">b</span></span>
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1580
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<pre style="margin: 0;">-<span id="LC1580" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="kt" style="color: #458; font-weight: 600;">Pair</span> <span class="n" style="color: #333;">tyL</span> <span class="n" style="color: #333;">tyR</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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1581
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<pre style="margin: 0;">-<span id="LC1581" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">isFunTy</span> <span class="n" style="color: #333;">tyL</span><span class="p">)</span> <span class="n" style="color: #333;">isFunTy</span> <span class="n" style="color: #333;">tyR</span></span>
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1582
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<pre style="margin: 0;">-<span id="LC1582" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">co_mult</span><span class="p">,</span> <span class="n" style="color: #333;">co_arg</span><span class="p">,</span> <span class="n" style="color: #333;">co_res</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">decomposeFunCo</span> <span class="kt" style="color: #458; font-weight: 600;">Representational</span> <span class="n" style="color: #333;">co</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1583" 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">
1583
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<pre style="margin: 0;">-<span id="LC1583" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">isReflCo</span> <span class="n" style="color: #333;">co_mult</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [collectBindersPushingCo]</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1584" 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">
1584
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<td class="diff-line-num new_line old" data-linenumber="1321" 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="LC1584" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">isReflCo</span> <span class="n" style="color: #333;">co_arg</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [collectBindersPushingCo]</span></span>
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1585
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<pre style="margin: 0;">-<span id="LC1585" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go_c</span> <span class="p">(</span><span class="n" style="color: #333;">b</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">bs</span><span class="p">)</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">co_res</span></span>
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1586
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<pre style="margin: 0;">-<span id="LC1586" class="line" lang="haskell"></span>
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1587
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<pre style="margin: 0;">-<span id="LC1587" 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="p">(</span><span class="n" style="color: #333;">reverse</span> <span class="n" style="color: #333;">bs</span><span class="p">,</span> <span class="n" style="color: #333;">mkCast</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Lam</span> <span class="n" style="color: #333;">b</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>
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1588
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<pre style="margin: 0;">-<span id="LC1588" class="line" lang="haskell"></span>
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1589
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<pre style="margin: 0;">-<span id="LC1589" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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1590
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<pre style="margin: 0;">-<span id="LC1590" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1591" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [collectBindersPushingCo]</span></span>
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<pre style="margin: 0;">-<span id="LC1592" 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="LC1593" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We just look for coercions of form</span></span>
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<pre style="margin: 0;">-<span id="LC1594" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <type> # w -> blah</span></span>
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<pre style="margin: 0;">-<span id="LC1595" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(and similarly for foralls) to keep this function simple. We could do</span></span>
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<pre style="margin: 0;">-<span id="LC1596" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">more elaborate stuff, but it'd involve substitution etc.</span></span>
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<pre style="margin: 0;">-<span id="LC1597" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1598" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/716b67d9b0ce485e2bfb6951b5f0586af642cad8#708fab0a51bd47227233eda4698e750ff6de66e0"><strong>compiler/GHC/Core/Subst.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">@@ -343,6 +343,8 @@ instance Outputable Subst where</td>
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<pre style="margin: 0;"> <span id="LC343" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC344" class="line" lang="haskell"><span class="n" style="color: #333;">substExprSC</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HasDebugCallStack</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Subst</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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<pre style="margin: 0;"> <span id="LC345" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Just like substExpr, but a no-op if the substitution is empty</span></span>
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<pre style="margin: 0;">+<span id="LC346" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note that this does /not/ replace occurrences of free vars with</span></span>
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<pre style="margin: 0;">+<span id="LC347" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- their canonical representatives in the in-scope set</span></span>
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<pre style="margin: 0;"> <span id="LC348" class="line" lang="haskell"><span class="n" style="color: #333;">substExprSC</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">orig_expr</span></span>
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<pre style="margin: 0;"> <span id="LC349" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isEmptySubst</span> <span class="n" style="color: #333;">subst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">orig_expr</span></span>
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<pre style="margin: 0;"> <span id="LC350" 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="c1" style="color: #998; font-style: italic;">-- pprTrace "enter subst-expr" (doc $$ ppr orig_expr) $</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">@@ -628,6 +630,9 @@ substIdInfo subst new_id info</td>
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<pre style="margin: 0;"> <span id="LC630" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC631" 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="LC632" class="line" lang="haskell"><span class="cd">-- | Substitutes for the 'Id's within an unfolding</span></span>
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<pre style="margin: 0;">+<span id="LC633" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- NB: substUnfolding /discards/ any unfolding without</span></span>
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<pre style="margin: 0;">+<span id="LC634" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- without a Stable source. This is usually what we want,</span></span>
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<pre style="margin: 0;">+<span id="LC635" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- but it may be a bit unexpected</span></span>
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<pre style="margin: 0;"> <span id="LC636" class="line" lang="haskell"><span class="n" style="color: #333;">substUnfolding</span><span class="p">,</span> <span class="n" style="color: #333;">substUnfoldingSC</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Subst</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Unfolding</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Unfolding</span></span>
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<pre style="margin: 0;"> <span id="LC637" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Seq'ing on the returned Unfolding is enough to cause</span></span>
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<pre style="margin: 0;"> <span id="LC638" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- all the substitutions to happen completely</span></span>
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