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<h3>
Ben Gamari pushed to branch wip/zap-coercions
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1e047402d6a59813461d7941338af6cfb574f252">1e047402</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-03-27T17:42:41-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix it
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<h4>1 changed file:</h4>
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<a href="#d01de95d8c71d4dec6a9a59146186e29a5b3fd38">
compiler/GHC/Core/Rules.hs
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<h4>Changes:</h4>
<li id="d01de95d8c71d4dec6a9a59146186e29a5b3fd38">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1e047402d6a59813461d7941338af6cfb574f252#d01de95d8c71d4dec6a9a59146186e29a5b3fd38"><strong>compiler/GHC/Core/Rules.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="842" 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">@@ -842,8 +842,8 @@ match_co renv subst co1 co2</td>
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842
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842
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<pre style="margin: 0;"> <span id="LC842" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">match_cos</span> <span class="n" style="color: #333;">renv</span> <span class="n" style="color: #333;">subst</span> <span class="p">[</span><span class="n" style="color: #333;">arg1</span><span class="p">,</span> <span class="n" style="color: #333;">res1</span><span class="p">]</span> <span class="p">[</span><span class="n" style="color: #333;">arg2</span><span class="p">,</span> <span class="n" style="color: #333;">res2</span><span class="p">]</span></span>
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843
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843
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<pre style="margin: 0;"> <span id="LC843" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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844
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844
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<pre style="margin: 0;"> <span id="LC844" class="line" lang="haskell"><span class="n" style="color: #333;">match_co</span> <span class="n" style="color: #333;">renv</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">co1</span> <span class="n" style="color: #333;">co2</span></span>
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845
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<pre style="margin: 0;">-<span id="LC845" 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;">prov1</span><span class="p">,</span> <span class="n" style="color: #333;">r1</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Pair</span> <span class="n" style="color: #333;">ty1a</span> <span class="n" style="color: #333;">ty1b</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitUnivCo_maybe</span> <span class="n" style="color: #333;">co1</span></span>
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846
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<pre style="margin: 0;">-<span id="LC846" 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;">prov2</span><span class="p">,</span> <span class="n" style="color: #333;">r2</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Pair</span> <span class="n" style="color: #333;">ty2a</span> <span class="n" style="color: #333;">ty2b</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitUnivCo_maybe</span> <span class="n" style="color: #333;">co2</span></span>
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<pre style="margin: 0;">+<span id="LC845" 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;"><span class="idiff left right">_</span>prov1</span><span class="p">,</span> <span class="n" style="color: #333;">r1</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Pair</span> <span class="n" style="color: #333;">ty1a</span> <span class="n" style="color: #333;">ty1b</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitUnivCo_maybe</span> <span class="n" style="color: #333;">co1</span></span>
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<pre style="margin: 0;">+<span id="LC846" 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;"><span class="idiff left right">_</span>prov2</span><span class="p">,</span> <span class="n" style="color: #333;">r2</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Pair</span> <span class="n" style="color: #333;">ty2a</span> <span class="n" style="color: #333;">ty2b</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitUnivCo_maybe</span> <span class="n" style="color: #333;">co2</span></span>
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847
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847
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<pre style="margin: 0;"> <span id="LC847" 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;">guard</span> <span class="p">(</span><span class="n" style="color: #333;">r1</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">r2</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC848" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- TODO: Should we try to match provenance?</span></span>
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<pre style="margin: 0;"> <span id="LC849" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">subst'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">match_ty</span> <span class="n" style="color: #333;">renv</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">ty1a</span> <span class="n" style="color: #333;">ty2a</span></span>
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