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<h3>
Marge Bot pushed to branch wip/marge_bot_batch_merge_job
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/bee43aca827387aa81a64801d82adcb596d01d9a">bee43aca</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-12T20:52:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rewrite and move the monad-state hack note
The note has been rewritten by @simonpj in !3851
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/25fdf25eb574d6d291673603ab36ac5ec7e37066">25fdf25e</a></strong>
<div>
<span>by Alan Zimmerman</span>
<i>at 2020-08-12T20:53:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ApiAnnotations: Fix parser for new GHC 9.0 features
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cff2bb3da5584863839a9d101bf1d5b6714aa857">cff2bb3d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-12T21:24:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">parser: Suggest ImportQualifiedPost in prepositive import warning
As suggested in #18545.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/01ea86e21f112006a0026e6415f4a517c5c24418">01ea86e2</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-08-12T21:24:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Better long-distance info for where bindings (#18533)
Where bindings can see evidence from the pattern match of the `GRHSs`
they belong to, but not from anything in any of the guards (which belong
to one of possibly many RHSs).
Before this patch, we did *not* consider said evidence, causing #18533,
where the lack of considering type information from a case pattern match
leads to failure to resolve the vanilla COMPLETE set of a data type.
Making available that information required a medium amount of
refactoring so that `checkMatches` can return a
`[(Deltas, NonEmpty Deltas)]`; one `(Deltas, NonEmpty Deltas)` for each
`GRHSs` of the match group. The first component of the pair is the
covered set of the pattern, the second component is one covered set per
RHS.
Fixes #18533.
Regression test case: T18533
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/23fac6834bba3181c13250aee54a28ddbeb3bddb">23fac683</a></strong>
<div>
<span>by Hécate</span>
<i>at 2020-08-12T21:24:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Re-add BangPatterns to CodePage.hs
</pre>
</li>
</ul>
<h4>23 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#92b713d88390e6ea489e24b6cff8a3960384c0d0">
compiler/GHC/Cmm/DebugBlock.hs
</a>
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<li class="file-stats">
<a href="#975dc08a8e7942b32d621f617d5a9c1b668601dd">
compiler/GHC/Core/Coercion/Opt.hs
</a>
</li>
<li class="file-stats">
<a href="#c3967bb9d3e8f5aae2dd111b5a335b48c21c1999">
compiler/GHC/Core/Opt/Arity.hs
</a>
</li>
<li class="file-stats">
<a href="#37879a759bc2ca5cc8f1f35235fe96e3e55b57c9">
compiler/GHC/Core/Opt/Simplify/Monad.hs
</a>
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<li class="file-stats">
<a href="#89a2e0e1a3095c7a42b10f2819049908908080e8">
compiler/GHC/Core/Unify.hs
</a>
</li>
<li class="file-stats">
<a href="#cc97d81e7223ad4a3a5e801156ca632f9fa75654">
compiler/GHC/Hs/Expr.hs
</a>
</li>
<li class="file-stats">
<a href="#0bae7e7e67b5f9b6ba2a371f8917cf74423a0c6f">
compiler/GHC/Hs/Pat.hs
</a>
</li>
<li class="file-stats">
<a href="#65e2067fbb7377818b6cadff0531f44029499948">
compiler/GHC/HsToCore/Binds.hs
</a>
</li>
<li class="file-stats">
<a href="#6bdd5abc649727f2a802bc96ce5c276de19d3726">
compiler/GHC/HsToCore/Expr.hs
</a>
</li>
<li class="file-stats">
<a href="#83f0b13548ac43fe13b1813fb407249ff9b825f7">
compiler/GHC/HsToCore/GuardedRHSs.hs
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</li>
<li class="file-stats">
<a href="#085703923f9c18f6ac9f926ac9a4c7c7e6d9d9ed">
compiler/GHC/HsToCore/Match.hs
</a>
</li>
<li class="file-stats">
<a href="#c8a27621f82549165d8946ae8e9f467660958059">
compiler/GHC/HsToCore/Monad.hs
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</li>
<li class="file-stats">
<a href="#ac0a6473a902628a18b3a470122e5cc1ce09de14">
compiler/GHC/HsToCore/PmCheck.hs
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</li>
<li class="file-stats">
<a href="#8d8e5922fde8bc19ffa2bc9cae6b6720abb88564">
compiler/GHC/HsToCore/PmCheck/Oracle.hs
</a>
</li>
<li class="file-stats">
<a href="#bf951467d4a9aa443cb109cb4c84a2891945649b">
compiler/GHC/Parser.y
</a>
</li>
<li class="file-stats">
<a href="#446cb12ca6cefaf1c6eb79b7db643632744263c7">
compiler/GHC/Parser/PostProcess.hs
</a>
</li>
<li class="file-stats">
<a href="#897218b3e24728ae9e5b0329b949493f1ede80fb">
compiler/GHC/Tc/Errors/Hole.hs
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</li>
<li class="file-stats">
<a href="#9355bef855426caf5f526925edf351b20f9a86c4">
compiler/GHC/Tc/Gen/HsType.hs
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</li>
<li class="file-stats">
<a href="#cb4ad425e8ed846dfcc5d3793b08b95f6864e545">
compiler/GHC/Utils/Monad.hs
</a>
</li>
<li class="file-stats">
<a href="#4569c39c0942a37f3d3a5b5014fcc735d38b82e8">
libraries/base/GHC/IO/Encoding/CodePage.hs
</a>
</li>
<li class="file-stats">
<a href="#496bf99eec323624c4dc197d4d61221c469a1bb3">
testsuite/tests/module/mod184.stderr
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</li>
<li class="file-stats">
<a href="#b28640cfb4cbe6647e0bb3a3e12ef25528acbbf7">
<span class="new-file">
+
testsuite/tests/pmcheck/should_compile/T18533.hs
</span>
</a>
</li>
<li class="file-stats">
<a href="#a52966ece03f9e76a93a2c4ea96b9fb25368723d">
testsuite/tests/pmcheck/should_compile/all.T
</a>
</li>
</ul>
<h4>Changes:</h4>
<li id="92b713d88390e6ea489e24b6cff8a3960384c0d0">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/855f71a9c639a72833b63cd03061cc92785c2228...23fac6834bba3181c13250aee54a28ddbeb3bddb#92b713d88390e6ea489e24b6cff8a3960384c0d0"><strong>compiler/GHC/Cmm/DebugBlock.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE CPP #-}</span></span>
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1
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2
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE GADTs #-}</span></span>
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2
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3
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE MultiWayIf #-}</span></span>
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3
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4
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="110" 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="111" 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">@@ -110,7 +111,9 @@ cmmDebugGen modLoc decls = map (blocksForScope Nothing) topScopes</td>
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<td class="diff-line-num old_line" data-linenumber="110" 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">
110
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<td class="diff-line-num new_line" data-linenumber="111" 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">
111
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<pre style="margin: 0;"> <span id="LC111" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- recover by copying ticks below.</span></span>
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<td class="diff-line-num old_line" data-linenumber="111" 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">
111
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<td class="diff-line-num new_line" data-linenumber="112" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC112" class="line" lang="haskell"> <span class="n" style="color: #333;">scp'</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">SubScope</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">scp'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">scp</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">scp'</span></span>
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<td class="diff-line-num old_line" data-linenumber="112" 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">
112
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<td class="diff-line-num new_line" data-linenumber="113" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC113" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">CombinedScope</span> <span class="n" style="color: #333;">scp'</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">scp</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">scp'</span></span>
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<td class="diff-line-num new old_line" data-linenumber="113" 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="114" 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="LC114" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">__GLASGOW_HASKELL__</span> <span class="o" style="font-weight: 600;"><=</span> <span class="mi" style="color: #099;">810</span></span>
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<td class="diff-line-num old_line" data-linenumber="113" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="diff-line-num new_line" data-linenumber="115" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC115" 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;">panic</span> <span class="s" style="color: #d14;">"findP impossible"</span></span>
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<td class="diff-line-num new old_line" data-linenumber="114" 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="116" 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="LC116" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="n" style="color: #333;">endif</span></span>
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<td class="diff-line-num old_line" data-linenumber="114" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="diff-line-num new_line" data-linenumber="117" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC117" class="line" lang="haskell"></span>
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<td class="diff-line-num old_line" data-linenumber="115" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="diff-line-num new_line" data-linenumber="118" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC118" class="line" lang="haskell"> <span class="n" style="color: #333;">scopeMap</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="p">(</span><span class="n" style="color: #333;">uncurry</span> <span class="n" style="color: #333;">insertMulti</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">Map</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">empty</span> <span class="n" style="color: #333;">childScopes</span></span>
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<pre style="margin: 0;"> <span id="LC119" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/855f71a9c639a72833b63cd03061cc92785c2228...23fac6834bba3181c13250aee54a28ddbeb3bddb#975dc08a8e7942b32d621f617d5a9c1b668601dd"><strong>compiler/GHC/Core/Coercion/Opt.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -559,7 +559,10 @@ opt_univ env sym prov role oty1 oty2</td>
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<pre style="margin: 0;"> <span id="LC559" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC560" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC561" class="line" lang="haskell"> <span class="n" style="color: #333;">prov'</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">prov</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC562" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">__GLASGOW_HASKELL__</span> <span class="o" style="font-weight: 600;"><=</span> <span class="mi" style="color: #099;">810</span></span>
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<pre style="margin: 0;">+<span id="LC563" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This alt is redundant with the first match of the FunDef</span></span>
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<pre style="margin: 0;"> <span id="LC564" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PhantomProv</span> <span class="n" style="color: #333;">kco</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PhantomProv</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">opt_co4_wrap</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">sym</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">kco</span></span>
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<pre style="margin: 0;">+<span id="LC565" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="n" style="color: #333;">endif</span></span>
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<pre style="margin: 0;"> <span id="LC566" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ProofIrrelProv</span> <span class="n" style="color: #333;">kco</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ProofIrrelProv</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">opt_co4_wrap</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">sym</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">kco</span></span>
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<pre style="margin: 0;"> <span id="LC567" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PluginProv</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">prov</span></span>
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<pre style="margin: 0;"> <span id="LC568" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/855f71a9c639a72833b63cd03061cc92785c2228...23fac6834bba3181c13250aee54a28ddbeb3bddb#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">@@ -1031,7 +1031,7 @@ one-shot flag from the inner \s{osf}. By expanding with the</td>
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<pre style="margin: 0;"> <span id="LC1031" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">ArityType gotten from analysing the RHS, we achieve this neatly.</span></span>
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<pre style="margin: 0;"> <span id="LC1032" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1033" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This makes a big difference to the one-shot monad trick;</span></span>
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<pre style="margin: 0;">-<span id="LC1034" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">see Note [The one-shot state monad trick] in GHC.<span class="idiff left right">Core.Unify</span>.</span></span>
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<pre style="margin: 0;">+<span id="LC1034" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">see Note [The one-shot state monad trick] in GHC.<span class="idiff left right">Utils.Monad</span>.</span></span>
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1035
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<pre style="margin: 0;"> <span id="LC1035" 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="LC1036" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1037" class="line" lang="haskell"><span class="cd">-- | @etaExpand n e@ returns an expression with</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/855f71a9c639a72833b63cd03061cc92785c2228...23fac6834bba3181c13250aee54a28ddbeb3bddb#37879a759bc2ca5cc8f1f35235fe96e3e55b57c9"><strong>compiler/GHC/Core/Opt/Simplify/Monad.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">@@ -71,7 +71,7 @@ pattern SM :: (SimplTopEnv -> UniqSupply -> SimplCount</td>
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This pattern synonym makes the simplifier monad eta-expand,</span></span>
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<pre style="margin: 0;"> <span id="LC72" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- which as a very beneficial effect on compiler performance</span></span>
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<pre style="margin: 0;"> <span id="LC73" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (worth a 1-2% reduction in bytes-allocated). See #18202.</span></span>
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<pre style="margin: 0;">-<span id="LC74" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [The one-shot state monad trick] in GHC.<span class="idiff left right">Core.Unify</span></span></span>
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<pre style="margin: 0;">+<span id="LC74" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [The one-shot state monad trick] in GHC.<span class="idiff left right">Utils.Monad</span></span></span>
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<pre style="margin: 0;"> <span id="LC75" class="line" lang="haskell"><span class="n" style="color: #333;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">SM</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">SM'</span> <span class="n" style="color: #333;">m</span></span>
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<pre style="margin: 0;"> <span id="LC76" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC77" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SM</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SM'</span> <span class="p">(</span><span class="n" style="color: #333;">oneShot</span> <span class="n" style="color: #333;">m</span><span class="p">)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/855f71a9c639a72833b63cd03061cc92785c2228...23fac6834bba3181c13250aee54a28ddbeb3bddb#89a2e0e1a3095c7a42b10f2819049908908080e8"><strong>compiler/GHC/Core/Unify.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">@@ -1212,77 +1212,6 @@ data BindFlag</td>
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<pre style="margin: 0;"> <span id="LC1212" 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="LC1213" 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="LC1214" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1215" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [The one-shot state monad trick]</span></span>
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<pre style="margin: 0;">-<span id="LC1216" 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="LC1217" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Many places in GHC use a state monad, and we really want those</span></span>
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<pre style="margin: 0;">-<span id="LC1218" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">functions to be eta-expanded (#18202). Consider</span></span>
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<pre style="margin: 0;">-<span id="LC1219" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1220" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> newtype M a = MkM (State -> (State, a))</span></span>
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<pre style="margin: 0;">-<span id="LC1221" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1222" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance Monad M where</span></span>
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<pre style="margin: 0;">-<span id="LC1223" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> mf >>= k = MkM (\s -> case mf of MkM f -></span></span>
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<pre style="margin: 0;">-<span id="LC1224" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> case f s of (s',r) -></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;"> case k r of MkM g -></span></span>
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<pre style="margin: 0;">-<span id="LC1226" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g s')</span></span>
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<pre style="margin: 0;">-<span id="LC1227" class="line" lang="haskell"></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;"> foo :: Int -> M Int</span></span>
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1229
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<td class="diff-line-num new_line old" data-linenumber="1215" 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="LC1229" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> foo x = g y >>= \r -> h r</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;"> where</span></span>
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1231
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<td class="diff-line-num new_line old" data-linenumber="1215" 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="LC1231" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> y = expensive x</span></span>
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1232
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<pre style="margin: 0;">-<span id="LC1232" class="line" lang="haskell"></span>
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<td class="diff-line-num old old_line" data-linenumber="1233" 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">
1233
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<td class="diff-line-num new_line old" data-linenumber="1215" 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="LC1233" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In general, you might say (map (foo 4) xs), and expect (expensive 4)</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1234" 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">
1234
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<td class="diff-line-num new_line old" data-linenumber="1215" 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="LC1234" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to be evaluated only once. So foo should have arity 1 (not 2).</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1235" 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">
1235
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<td class="diff-line-num new_line old" data-linenumber="1215" 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="LC1235" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But that's rare, and if you /aren't/ re-using (M a) values it's much</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1236" 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">
1236
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<td class="diff-line-num new_line old" data-linenumber="1215" 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="LC1236" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">more efficient to make foo have arity 2.</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;">See https://www.joachim-breitner.de/blog/763-Faster_Winter_5__Eta-Expanding_ReaderT</span></span>
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1239
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<pre style="margin: 0;">-<span id="LC1239" class="line" lang="haskell"></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;">So here is the trick. Define</span></span>
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1241
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<pre style="margin: 0;">-<span id="LC1241" class="line" lang="haskell"></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;"> data M a = MkM' (State -> (State, a))</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;"> pattern MkM f <- MkM' f</span></span>
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1244
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<pre style="margin: 0;">-<span id="LC1244" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> where</span></span>
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1245
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<pre style="margin: 0;">-<span id="LC1245" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkM f = MkM' (oneShot f)</span></span>
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1246
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<pre style="margin: 0;">-<span id="LC1246" class="line" lang="haskell"></span>
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1247
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<pre style="margin: 0;">-<span id="LC1247" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The patten synonm means that whenever we write (MkM f), we'll</span></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;">actually get (MkM' (oneShot f)), so we'll pin a one-shot flag</span></span>
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1249
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<pre style="margin: 0;">-<span id="LC1249" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">on f's lambda-binder. Now look at foo:</span></span>
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1250
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<pre style="margin: 0;">-<span id="LC1250" class="line" lang="haskell"></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;"> foo = \x. g (expensive x) >>= \r -> h r</span></span>
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1252
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<pre style="margin: 0;">-<span id="LC1252" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = \x. let mf = g (expensive x)</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;"> k = \r -> h r</span></span>
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1254
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<pre style="margin: 0;">-<span id="LC1254" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in MkM' (oneShot (\s -> case mf of MkM' f -></span></span>
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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;"> case f s of (s',r) -></span></span>
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1256
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<pre style="margin: 0;">-<span id="LC1256" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> case k r of MkM' g -></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;"> g s'))</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;"> -- The MkM' are just newtype casts nt_co</span></span>
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1259
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<td class="diff-line-num new_line old" data-linenumber="1215" 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="LC1259" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = \x. let mf = g (expensive x)</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;"> k = \r -> h r</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;"> in (\s{os}. case (mf |> nt_co) s of (s',r) -></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;"> (k r) |> nt_co s')</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;"> |> sym nt_co</span></span>
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1264
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<pre style="margin: 0;">-<span id="LC1264" class="line" lang="haskell"></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;"> -- Float into that \s{os}</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;"> = \x. (\s{os}. case (g (expensive x) |> nt_co) s of (s',r) -></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;"> h r |> nt_co s')</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;"> |> sym nt_co</span></span>
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1269
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<pre style="margin: 0;">-<span id="LC1269" class="line" lang="haskell"></span>
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1270
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<td class="diff-line-num new_line old" data-linenumber="1215" 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="LC1270" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and voila! In summary:</span></span>
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1271
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<pre style="margin: 0;">-<span id="LC1271" class="line" lang="haskell"></span>
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1272
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<td class="diff-line-num new_line old" data-linenumber="1215" 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="LC1272" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* It's a very simple, two-line change</span></span>
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1273
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<pre style="margin: 0;">-<span id="LC1273" class="line" lang="haskell"></span>
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1274
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<td class="diff-line-num new_line old" data-linenumber="1215" 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="LC1274" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* It eta-expands all uses of the monad, automatically</span></span>
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1275
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<pre style="margin: 0;">-<span id="LC1275" class="line" lang="haskell"></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;">* It is very similar to the built-in "state hack" (see</span></span>
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<pre style="margin: 0;">-<span id="LC1277" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> GHC.Core.Opt.Arity Note [The state-transformer hack]) but the trick</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;"> described here is applicable on a monad-by-monad basis under</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;"> programmer control.</span></span>
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1280
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<pre style="margin: 0;">-<span id="LC1280" class="line" lang="haskell"></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;">* Beware: itt changes the behaviour of</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;"> map (foo 3) xs</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;"> ToDo: explain what to do if you want to do this</span></span>
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1284
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<pre style="margin: 0;">-<span id="LC1284" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1285
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<pre style="margin: 0;">-<span id="LC1285" class="line" lang="haskell"></span>
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1215
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<pre style="margin: 0;"> <span id="LC1215" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">UMEnv</span></span>
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<pre style="margin: 0;"> <span id="LC1216" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">UMEnv</span> <span class="p">{</span> <span class="n" style="color: #333;">um_unif</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">AmIUnifying</span></span>
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1217
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<pre style="margin: 0;"> <span id="LC1217" 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">@@ -1311,11 +1240,11 @@ data UMState = UMState</td>
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1240
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<pre style="margin: 0;"> <span id="LC1240" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1241" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">UM</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;"> <span id="LC1242" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">UM'</span> <span class="p">{</span> <span class="n" style="color: #333;">unUM</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">UMState</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">UnifyResultM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UMState</span><span class="p">,</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC1314" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [The one-shot state monad trick]</span></span>
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<pre style="margin: 0;">+<span id="LC1243" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [The one-shot state monad trick]<span class="idiff left right"> in GHC.Utils.Monad</span></span></span>
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1315
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<pre style="margin: 0;"> <span id="LC1244" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Functor</span><span class="p">)</span></span>
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1316
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1245
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<pre style="margin: 0;"> <span id="LC1245" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1246" class="line" lang="haskell"><span class="n" style="color: #333;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">UM</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UMState</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">UnifyResultM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UMState</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;">UM</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">-<span id="LC1318" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [The one-shot state monad trick]</span></span>
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<pre style="margin: 0;">+<span id="LC1247" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [The one-shot state monad trick]<span class="idiff left right"> in GHC.Utils.Monad</span></span></span>
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<pre style="margin: 0;"> <span id="LC1248" class="line" lang="haskell"><span class="n" style="color: #333;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">UM</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">UM'</span> <span class="n" style="color: #333;">m</span></span>
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<pre style="margin: 0;"> <span id="LC1249" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC1250" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">UM</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">UM'</span> <span class="p">(</span><span class="n" style="color: #333;">oneShot</span> <span class="n" style="color: #333;">m</span><span class="p">)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/855f71a9c639a72833b63cd03061cc92785c2228...23fac6834bba3181c13250aee54a28ddbeb3bddb#cc97d81e7223ad4a3a5e801156ca632f9fa75654"><strong>compiler/GHC/Hs/Expr.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">@@ -1243,7 +1243,9 @@ ppr_infix_expr (HsConLikeOut _ c) = Just (pprInfixOcc (conLikeName c))</td>
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<pre style="margin: 0;"> <span id="LC1243" class="line" lang="haskell"><span class="n" style="color: #333;">ppr_infix_expr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsRecFld</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">f</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">pprInfixOcc</span> <span class="n" style="color: #333;">f</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1244" class="line" lang="haskell"><span class="n" style="color: #333;">ppr_infix_expr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsUnboundVar</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">occ</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">pprInfixOcc</span> <span class="n" style="color: #333;">occ</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1245" class="line" lang="haskell"><span class="n" style="color: #333;">ppr_infix_expr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XExpr</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="p">(</span><span class="n" style="color: #333;">ghcPass</span> <span class="o" style="font-weight: 600;">@</span><span class="n" style="color: #333;">p</span><span class="p">,</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC1246" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">__GLASGOW_HASKELL__</span> <span class="o" style="font-weight: 600;"><=</span> <span class="mi" style="color: #099;">810</span></span>
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<pre style="margin: 0;"> <span id="LC1247" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPs</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="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<pre style="margin: 0;">+<span id="LC1248" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="n" style="color: #333;">endif</span></span>
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<pre style="margin: 0;"> <span id="LC1249" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">HsExpanded</span> <span class="n" style="color: #333;">a</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;">ppr_infix_expr</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;"> <span id="LC1250" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">WrapExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsWrap</span> <span class="kr" style="font-weight: 600;">_</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;">ppr_infix_expr</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;"> <span id="LC1251" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ExpansionExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsExpanded</span> <span class="n" style="color: #333;">a</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;">ppr_infix_expr</span> <span class="n" style="color: #333;">a</span></span>
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<li id="0bae7e7e67b5f9b6ba2a371f8917cf74423a0c6f">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/855f71a9c639a72833b63cd03061cc92785c2228...23fac6834bba3181c13250aee54a28ddbeb3bddb#0bae7e7e67b5f9b6ba2a371f8917cf74423a0c6f"><strong>compiler/GHC/Hs/Pat.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">@@ -845,8 +845,10 @@ patNeedsParens p = go</td>
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<pre style="margin: 0;"> <span id="LC845" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SigPat</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">>=</span> <span class="n" style="color: #333;">sigPrec</span></span>
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846
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846
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<pre style="margin: 0;"> <span id="LC846" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ViewPat</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="LC847" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XPat</span> <span class="n" style="color: #333;">ext</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">ghcPass</span> <span class="o" style="font-weight: 600;">@</span><span class="n" style="color: #333;">p</span> <span class="kr" style="font-weight: 600;">of</span></span>
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848
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<pre style="margin: 0;">+<span id="LC848" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">__GLASGOW_HASKELL__</span> <span class="o" style="font-weight: 600;"><=</span> <span class="mi" style="color: #099;">810</span></span>
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848
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849
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<pre style="margin: 0;"> <span id="LC849" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">noExtCon</span> <span class="n" style="color: #333;">ext</span></span>
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849
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850
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<pre style="margin: 0;"> <span id="LC850" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">noExtCon</span> <span class="n" style="color: #333;">ext</span></span>
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851
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<pre style="margin: 0;">+<span id="LC851" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="n" style="color: #333;">endif</span></span>
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850
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852
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<pre style="margin: 0;"> <span id="LC852" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">inner</span></span>
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851
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853
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<pre style="margin: 0;"> <span id="LC853" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="kt" style="color: #458; font-weight: 600;">CoPat</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">inner</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ext</span></span>
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852
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854
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<pre style="margin: 0;"> <span id="LC854" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WildPat</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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<li id="65e2067fbb7377818b6cadff0531f44029499948">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/855f71a9c639a72833b63cd03061cc92785c2228...23fac6834bba3181c13250aee54a28ddbeb3bddb#65e2067fbb7377818b6cadff0531f44029499948"><strong>compiler/GHC/HsToCore/Binds.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">@@ -33,7 +33,7 @@ import {-# SOURCE #-} GHC.HsToCore.Match ( matchWrapper )</td>
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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.HsToCore.Monad</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.HsToCore.GuardedRHSs</span></span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.HsToCore.Utils</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.HsToCore.PmCheck</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">addTyCsDs</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkG<span class="idiff left right">uardMatche</span>s</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.HsToCore.PmCheck</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">addTyCsDs</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkG<span class="idiff left right">RHS</span>s</span> <span class="p">)</span></span>
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37
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"></span>
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38
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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.Hs</span> <span class="c1" style="color: #998; font-style: italic;">-- lots of things</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</span> <span class="c1" style="color: #998; font-style: italic;">-- lots of things</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">@@ -78,7 +78,6 @@ import GHC.Types.Unique.Set( nonDetEltsUniqSet )</td>
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<pre style="margin: 0;"> <span id="LC78" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Monad</span></span>
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79
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<pre style="margin: 0;"> <span id="LC79" 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.LanguageExtensions</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">LangExt</span></span>
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<pre style="margin: 0;"> <span id="LC80" 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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81
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<pre style="margin: 0;">-<span id="LC81" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List.NonEmpty</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">nonEmpty</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC81" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC82" 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="LC83" 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">@@ -185,8 +184,8 @@ dsHsBind dflags b@(FunBind { fun_id = L loc fun</td>
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185
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<pre style="margin: 0;"> <span id="LC184" class="line" lang="haskell"><span class="n" style="color: #333;">dsHsBind</span> <span class="n" style="color: #333;">dflags</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PatBind</span> <span class="p">{</span> <span class="n" style="color: #333;">pat_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pat</span><span class="p">,</span> <span class="n" style="color: #333;">pat_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">grhss</span></span>
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<pre style="margin: 0;"> <span id="LC185" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">pat_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NPatBindTc</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ty</span></span>
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187
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<pre style="margin: 0;"> <span id="LC186" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">pat_ticks</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">rhs_tick</span><span class="p">,</span> <span class="n" style="color: #333;">var_ticks</span><span class="p">)</span> <span class="p">})</span></span>
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188
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<pre style="margin: 0;">-<span id="LC188" 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;">rhss_deltas</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkG<span class="idiff left right">uardMatche</span>s</span> <span class="kt" style="color: #458; font-weight: 600;">PatBindGuards</span> <span class="n" style="color: #333;">grhss</span></span>
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189
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<pre style="margin: 0;">-<span id="LC189" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">body_expr</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsGuarded</span> <span class="n" style="color: #333;">grhss</span> <span class="n" style="color: #333;">ty</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">nonEmpty</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rhss_deltas</span></span><span class="p"><span class="idiff right">)</span></span></span>
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187
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<pre style="margin: 0;">+<span id="LC187" 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;">rhss_deltas</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkG<span class="idiff left right">RHS</span>s</span> <span class="kt" style="color: #458; font-weight: 600;">PatBindGuards</span> <span class="n" style="color: #333;">grhss</span></span>
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188
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<pre style="margin: 0;">+<span id="LC188" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">body_expr</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsGuarded</span> <span class="n" style="color: #333;">grhss</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;"><span class="idiff left right">rhss_deltas</span></span></span>
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190
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189
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<pre style="margin: 0;"> <span id="LC189" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">body'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkOptTickBox</span> <span class="n" style="color: #333;">rhs_tick</span> <span class="n" style="color: #333;">body_expr</span></span>
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<pre style="margin: 0;"> <span id="LC190" class="line" lang="haskell"> <span class="n" style="color: #333;">pat'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">decideBangHood</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">pat</span></span>
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<pre style="margin: 0;"> <span id="LC191" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">force_var</span><span class="p">,</span><span class="n" style="color: #333;">sel_binds</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkSelectorBinds</span> <span class="n" style="color: #333;">var_ticks</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">body'</span></span>
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<li id="6bdd5abc649727f2a802bc96ce5c276de19d3726">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/855f71a9c639a72833b63cd03061cc92785c2228...23fac6834bba3181c13250aee54a28ddbeb3bddb#6bdd5abc649727f2a802bc96ce5c276de19d3726"><strong>compiler/GHC/HsToCore/Expr.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">@@ -31,7 +31,7 @@ import GHC.HsToCore.ListComp</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.HsToCore.Utils</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.HsToCore.Arrows</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.HsToCore.Monad</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.HsToCore.PmCheck</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">addTyCsDs</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkG<span class="idiff left right">uardMatche</span>s</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.HsToCore.PmCheck</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">addTyCsDs</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkG<span class="idiff left right">RHS</span>s</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC35" 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="LC36" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Name.Env</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.FamInstEnv</span><span class="p">(</span> <span class="n" style="color: #333;">topNormaliseType</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">@@ -70,7 +70,6 @@ import GHC.Utils.Panic</td>
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<pre style="margin: 0;"> <span id="LC70" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.PatSyn</span></span>
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC72" 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="LC73" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List.NonEmpty</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">nonEmpty</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC73" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC74" 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="LC75" 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">@@ -216,8 +215,8 @@ dsUnliftedBind (PatBind {pat_lhs = pat, pat_rhs = grhss</td>
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<pre style="margin: 0;"> <span id="LC215" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">pat_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NPatBindTc</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ty</span> <span class="p">})</span> <span class="n" style="color: #333;">body</span></span>
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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="c1" style="color: #998; font-style: italic;">-- let C x# y# = rhs in body</span></span>
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<pre style="margin: 0;"> <span id="LC217" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ==> case rhs of C x# y# -> body</span></span>
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<pre style="margin: 0;">-<span id="LC219" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;"><span class="idiff left">rhs_deltas</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 right">checkGuardMatche</span>s</span> <span class="kt" style="color: #458; font-weight: 600;">PatBindGuards</span> <span class="n" style="color: #333;">grhss</span></span>
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<pre style="margin: 0;">-<span id="LC220" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rhs</span> <span class="o" style="font-weight: 600;"><span class="idiff left"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">dsGuarded</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">grhss</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">nonEmpty</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rhs_deltas</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC218" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;"><span class="idiff left">match_deltas</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 right">checkGRHS</span>s</span> <span class="kt" style="color: #458; font-weight: 600;">PatBindGuards</span> <span class="n" style="color: #333;">grhss</span></span>
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<pre style="margin: 0;">+<span id="LC219" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rhs</span> <span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">dsGuarded</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">grhss</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">match_deltas</span></span></span>
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<pre style="margin: 0;"> <span id="LC220" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">upat</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">pat</span></span>
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<pre style="margin: 0;"> <span id="LC221" class="line" lang="haskell"> <span class="n" style="color: #333;">eqn</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">EqnInfo</span> <span class="p">{</span> <span class="n" style="color: #333;">eqn_pats</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="n" style="color: #333;">upat</span><span class="p">],</span></span>
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<pre style="margin: 0;"> <span id="LC222" class="line" lang="haskell"> <span class="n" style="color: #333;">eqn_orig</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FromSource</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">@@ -487,8 +486,8 @@ dsExpr (HsMultiIf res_ty alts)</td>
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<pre style="margin: 0;"> <span id="LC486" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC487" 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="LC488" 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;">grhss</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">GRHSs</span> <span class="n" style="color: #333;">noExtField</span> <span class="n" style="color: #333;">alts</span> <span class="p">(</span><span class="n" style="color: #333;">noLoc</span> <span class="n" style="color: #333;">emptyLocalBinds</span><span class="p">)</span></span>
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490
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<pre style="margin: 0;">-<span id="LC490" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rhss_deltas</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkG<span class="idiff left right">uardMatche</span>s</span> <span class="kt" style="color: #458; font-weight: 600;">IfAlt</span> <span class="n" style="color: #333;">grhss</span></span>
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491
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<pre style="margin: 0;">-<span id="LC491" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">match_result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsGRHSs</span> <span class="kt" style="color: #458; font-weight: 600;">IfAlt</span> <span class="n" style="color: #333;">grhss</span> <span class="n" style="color: #333;">res_ty</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">nonEmpty</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rhss_deltas</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC489" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rhss_deltas</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkG<span class="idiff left right">RHS</span>s</span> <span class="kt" style="color: #458; font-weight: 600;">IfAlt</span> <span class="n" style="color: #333;">grhss</span></span>
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<pre style="margin: 0;">+<span id="LC490" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">match_result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsGRHSs</span> <span class="kt" style="color: #458; font-weight: 600;">IfAlt</span> <span class="n" style="color: #333;">grhss</span> <span class="n" style="color: #333;">res_ty</span> <span class="n" style="color: #333;"><span class="idiff left right">rhss_deltas</span></span></span>
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<pre style="margin: 0;"> <span id="LC491" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">error_expr</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkErrorExpr</span></span>
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492
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<pre style="margin: 0;"> <span id="LC492" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">extractMatchResult</span> <span class="n" style="color: #333;">match_result</span> <span class="n" style="color: #333;">error_expr</span> <span class="p">}</span></span>
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494
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<pre style="margin: 0;"> <span id="LC493" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<li id="83f0b13548ac43fe13b1813fb407249ff9b825f7">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/855f71a9c639a72833b63cd03061cc92785c2228...23fac6834bba3181c13250aee54a28ddbeb3bddb#83f0b13548ac43fe13b1813fb407249ff9b825f7"><strong>compiler/GHC/HsToCore/GuardedRHSs.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">@@ -25,7 +25,7 @@ import GHC.Core.Utils (bindNonRec)</td>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"></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.HsToCore.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="nn" style="color: #555;">GHC.HsToCore.Utils</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.HsToCore.PmCheck.Types</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Deltas</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">initDeltas</span></span> <span class="p">)</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.HsToCore.PmCheck.Types</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Deltas</span> <span class="p">)</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.Type</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Misc</span></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.SrcLoc</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">@@ -48,9 +48,9 @@ producing an expression with a runtime error in the corner if</td>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">necessary. The type argument gives the type of the @ei@.</span></span>
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<pre style="margin: 0;"> <span id="LC49" 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="LC50" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC51" class="line" lang="haskell"><span class="n" style="color: #333;">dsGuarded</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">GRHSs</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">)</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;"><span class="idiff left">Maybe</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">NonEmpty</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Deltas</span></span><span class="p"><span class="idiff right">)</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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<pre style="margin: 0;">-<span id="LC52" class="line" lang="haskell"><span class="n" style="color: #333;">dsGuarded</span> <span class="n" style="color: #333;">grhss</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="n" style="color: #333;"><span class="idiff left right">mb_</span>rhss_deltas</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">-<span id="LC53" class="line" lang="haskell"> <span class="n" style="color: #333;">match_result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsGRHSs</span> <span class="kt" style="color: #458; font-weight: 600;">PatBindRhs</span> <span class="n" style="color: #333;">grhss</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="n" style="color: #333;"><span class="idiff left right">mb_</span>rhss_deltas</span></span>
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<pre style="margin: 0;">+<span id="LC51" class="line" lang="haskell"><span class="n" style="color: #333;">dsGuarded</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">GRHSs</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">)</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;"><span class="idiff left">NonEmpty</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Deltas</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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<pre style="margin: 0;">+<span id="LC52" class="line" lang="haskell"><span class="n" style="color: #333;">dsGuarded</span> <span class="n" style="color: #333;">grhss</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="n" style="color: #333;">rhss_deltas</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC53" class="line" lang="haskell"> <span class="n" style="color: #333;">match_result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsGRHSs</span> <span class="kt" style="color: #458; font-weight: 600;">PatBindRhs</span> <span class="n" style="color: #333;">grhss</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="n" style="color: #333;">rhss_deltas</span></span>
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="haskell"> <span class="n" style="color: #333;">error_expr</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkErrorAppDs</span> <span class="n" style="color: #333;">nON_EXHAUSTIVE_GUARDS_ERROR_ID</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="n" style="color: #333;">empty</span></span>
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="haskell"> <span class="n" style="color: #333;">extractMatchResult</span> <span class="n" style="color: #333;">match_result</span> <span class="n" style="color: #333;">error_expr</span></span>
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<pre style="margin: 0;"> <span id="LC56" 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">@@ -59,25 +59,28 @@ dsGuarded grhss rhs_ty mb_rhss_deltas = do</td>
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<pre style="margin: 0;"> <span id="LC59" class="line" lang="haskell"><span class="n" style="color: #333;">dsGRHSs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsMatchContext</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span></span>
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">GRHSs</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Guarded RHSs</span></span>
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<pre style="margin: 0;"> <span id="LC61" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Type of RHS</span></span>
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<pre style="margin: 0;">-<span id="LC62" class="line" lang="haskell"> <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="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NonEmpty</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Deltas</span></span><span class="p"><span class="idiff right">)</span></span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Refined pattern match checking</span></span>
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<pre style="margin: 0;">-<span id="LC63" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- models, one for <span class="idiff left right">each GRHS. Defaults</span></span></span>
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<pre style="margin: 0;">-<span id="LC64" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">to 'initDeltas' if 'Nothing'</span>.</span></span>
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<pre style="margin: 0;">+<span id="LC62" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">NonEmpty</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Deltas</span></span><span class="idiff right"> </span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Refined pattern match checking</span></span>
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<pre style="margin: 0;">+<span id="LC63" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- models, one for <span class="idiff left right">the pattern part and</span></span></span>
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<pre style="margin: 0;">+<span id="LC64" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">one for each GRHS</span>.</span></span>
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<pre style="margin: 0;"> <span id="LC65" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MatchResult</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC66" class="line" lang="haskell"><span class="n" style="color: #333;">dsGRHSs</span> <span class="n" style="color: #333;">hs_ctx</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GRHSs</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">grhss</span> <span class="n" style="color: #333;">binds</span><span class="p">)</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="n" style="color: #333;"><span class="idiff left right">mb_</span>rhss_deltas</span></span>
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<pre style="margin: 0;">+<span id="LC66" class="line" lang="haskell"><span class="n" style="color: #333;">dsGRHSs</span> <span class="n" style="color: #333;">hs_ctx</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GRHSs</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">grhss</span> <span class="n" style="color: #333;">binds</span><span class="p">)</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="n" style="color: #333;">rhss_deltas</span></span>
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<pre style="margin: 0;"> <span id="LC67" 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;">notNull</span> <span class="n" style="color: #333;">grhss</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC68" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">match_results</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">toList</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">mb_rhss_deltas</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC69" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">dsGRHS</span> <span class="n" style="color: #333;">hs_ctx</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="n" style="color: #333;">initDeltas</span><span class="p">)</span> <span class="n" style="color: #333;">grhss</span></span>
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<pre style="margin: 0;">-<span id="LC70" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">rhss_deltas</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">grhss</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">rhss_deltas</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC71" class="line" lang="haskell"> <span class="n" style="color: #333;">zipWithM</span> <span class="p">(</span><span class="n" style="color: #333;">dsGRHS</span> <span class="n" style="color: #333;">hs_ctx</span> <span class="n" style="color: #333;">rhs_ty</span><span class="p">)</span> <span class="n" style="color: #333;">rhss_deltas</span> <span class="n" style="color: #333;">grhss</span></span>
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<pre style="margin: 0;">-<span id="LC72" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">match_result1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr1</span> <span class="n" style="color: #333;">combineMatchResults</span> <span class="n" style="color: #333;">match_results</span></span>
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<pre style="margin: 0;">-<span id="LC73" class="line" lang="haskell"> <span class="n" style="color: #333;">match_result2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">adjustMatchResultDs</span> <span class="p">(</span><span class="n" style="color: #333;">dsLocalBinds</span> <span class="n" style="color: #333;">binds</span><span class="p">)</span> <span class="n" style="color: #333;">match_result1</span></span>
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<pre style="margin: 0;">+<span id="LC68" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">match_results</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">grhss</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">rhss_deltas</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC69" class="line" lang="haskell"> <span class="n" style="color: #333;">zipWithM</span> <span class="p">(</span><span class="n" style="color: #333;">dsGRHS</span> <span class="n" style="color: #333;">hs_ctx</span> <span class="n" style="color: #333;">rhs_ty</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">toList</span> <span class="n" style="color: #333;">rhss_deltas</span><span class="p">)</span> <span class="n" style="color: #333;">grhss</span></span>
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<pre style="margin: 0;">+<span id="LC70" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">deltas</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getPmDeltas</span></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;">-- We need to remember the Deltas from the particular match context we</span></span>
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<pre style="margin: 0;">+<span id="LC72" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- are in, which might be different to when dsLocalBinds is actually</span></span>
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<pre style="margin: 0;">+<span id="LC73" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- called.</span></span>
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<pre style="margin: 0;">+<span id="LC74" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ds_binds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">updPmDeltas</span> <span class="n" style="color: #333;">deltas</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">dsLocalBinds</span> <span class="n" style="color: #333;">binds</span></span>
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<pre style="margin: 0;">+<span id="LC75" class="line" lang="haskell"> <span class="n" style="color: #333;">match_result1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr1</span> <span class="n" style="color: #333;">combineMatchResults</span> <span class="n" style="color: #333;">match_results</span></span>
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<pre style="margin: 0;">+<span id="LC76" class="line" lang="haskell"> <span class="n" style="color: #333;">match_result2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">adjustMatchResultDs</span> <span class="n" style="color: #333;">ds_binds</span> <span class="n" style="color: #333;">match_result1</span></span>
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<pre style="margin: 0;"> <span id="LC77" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: nested dsLet inside matchResult</span></span>
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<pre style="margin: 0;"> <span id="LC78" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">match_result2</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC79" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC80" class="line" lang="haskell"><span class="n" style="color: #333;">dsGRHS</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsMatchContext</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</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;">Deltas</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LGRHS</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC81" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MatchResult</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC82" class="line" lang="haskell"><span class="n" style="color: #333;">dsGRHS</span> <span class="n" style="color: #333;">hs_ctx</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="n" style="color: #333;">rhs_deltas</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GRHS</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">guards</span> <span class="n" style="color: #333;">rhs</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC80" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left">updPmDeltas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rhs_deltas</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">matchGuards</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">map</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">unLoc</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">guards</span></span><span class="p"><span class="idiff">)</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">PatGuard</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">hs_ctx</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rhs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rhs_ty</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC83" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left">matchGuards</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">map</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">unLoc</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">guards</span></span><span class="p"><span class="idiff">)</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">PatGuard</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">hs_ctx</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rhs_deltas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rhs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">rhs_ty</span></span></span>
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<pre style="margin: 0;"> <span id="LC84" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC85" 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="LC86" 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">@@ -89,6 +92,7 @@ dsGRHS hs_ctx rhs_ty rhs_deltas (L _ (GRHS _ guards rhs))</td>
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<pre style="margin: 0;"> <span id="LC92" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC93" class="line" lang="haskell"><span class="n" style="color: #333;">matchGuards</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">GuardStmt</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- Guard</span></span>
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<pre style="margin: 0;"> <span id="LC94" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsStmtContext</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="c1" style="color: #998; font-style: italic;">-- Context</span></span>
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<pre style="margin: 0;">+<span id="LC95" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Deltas</span> <span class="c1" style="color: #998; font-style: italic;">-- The RHS's covered set for PmCheck</span></span>
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<pre style="margin: 0;"> <span id="LC96" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="c1" style="color: #998; font-style: italic;">-- RHS</span></span>
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<pre style="margin: 0;"> <span id="LC97" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="c1" style="color: #998; font-style: italic;">-- Type of RHS of guard</span></span>
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<pre style="margin: 0;"> <span id="LC98" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MatchResult</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</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">@@ -96,8 +100,8 @@ matchGuards :: [GuardStmt GhcTc] -- Guard</td>
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<pre style="margin: 0;"> <span id="LC100" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See comments with HsExpr.Stmt re what a BodyStmt means</span></span>
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<pre style="margin: 0;"> <span id="LC101" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Here we must be in a guard context (not do-expression, nor list-comp)</span></span>
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102
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<pre style="margin: 0;"> <span id="LC102" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC99" class="line" lang="haskell"><span class="n" style="color: #333;">matchGuards</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">rhs</span> <span class="kr" style="font-weight: 600;">_</span></span>
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<pre style="margin: 0;">-<span id="LC100" 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;">core_rhs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;"><span class="idiff left">dsLExpr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">rhs</span></span></span>
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<pre style="margin: 0;">+<span id="LC103" class="line" lang="haskell"><span class="n" style="color: #333;">matchGuards</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;"><span class="idiff left">deltas</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">rhs</span> <span class="kr" style="font-weight: 600;">_</span></span>
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<pre style="margin: 0;">+<span id="LC104" 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;">core_rhs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;"><span class="idiff left">updPmDeltas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">deltas</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">dsLExpr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rhs</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;"> <span id="LC105" 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;">cantFailMatchResult</span> <span class="n" style="color: #333;">core_rhs</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC106" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC107" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- BodyStmts must be guards</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">@@ -107,41 +111,41 @@ matchGuards [] _ rhs _</td>
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<pre style="margin: 0;"> <span id="LC111" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: The success of this clause depends on the typechecker not</span></span>
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<pre style="margin: 0;"> <span id="LC112" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- wrapping the 'otherwise' in empty HsTyApp or HsWrap constructors</span></span>
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<pre style="margin: 0;"> <span id="LC113" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If it does, you'll get bogus overlap warnings</span></span>
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<pre style="margin: 0;">-<span id="LC110" class="line" lang="haskell"><span class="n" style="color: #333;">matchGuards</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">BodyStmt</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">e</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">stmts</span><span class="p">)</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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<pre style="margin: 0;">+<span id="LC114" class="line" lang="haskell"><span class="n" style="color: #333;">matchGuards</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">BodyStmt</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">e</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">stmts</span><span class="p">)</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;"><span class="idiff left">deltas</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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<pre style="margin: 0;"> <span id="LC115" 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;">addTicks</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isTrueLHsExpr</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">-<span id="LC112" class="line" lang="haskell"> <span class="n" style="color: #333;">match_result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchGuards</span> <span class="n" style="color: #333;">stmts</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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<pre style="margin: 0;">+<span id="LC116" class="line" lang="haskell"> <span class="n" style="color: #333;">match_result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchGuards</span> <span class="n" style="color: #333;">stmts</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;"><span class="idiff left">deltas</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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<pre style="margin: 0;"> <span id="LC117" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">adjustMatchResultDs</span> <span class="n" style="color: #333;">addTicks</span> <span class="n" style="color: #333;">match_result</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC114" class="line" lang="haskell"><span class="n" style="color: #333;">matchGuards</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">BodyStmt</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">expr</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">stmts</span><span class="p">)</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">-<span id="LC115" class="line" lang="haskell"> <span class="n" style="color: #333;">match_result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchGuards</span> <span class="n" style="color: #333;">stmts</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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<pre style="margin: 0;">+<span id="LC118" class="line" lang="haskell"><span class="n" style="color: #333;">matchGuards</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">BodyStmt</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">expr</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">stmts</span><span class="p">)</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;"><span class="idiff left">deltas</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC119" class="line" lang="haskell"> <span class="n" style="color: #333;">match_result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchGuards</span> <span class="n" style="color: #333;">stmts</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;"><span class="idiff left">deltas</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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<pre style="margin: 0;"> <span id="LC120" class="line" lang="haskell"> <span class="n" style="color: #333;">pred_expr</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsLExpr</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;"> <span id="LC121" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkGuardedMatchResult</span> <span class="n" style="color: #333;">pred_expr</span> <span class="n" style="color: #333;">match_result</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC122" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC119" class="line" lang="haskell"><span class="n" style="color: #333;">matchGuards</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LetStmt</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">binds</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">stmts</span><span class="p">)</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">-<span id="LC120" class="line" lang="haskell"> <span class="n" style="color: #333;">match_result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchGuards</span> <span class="n" style="color: #333;">stmts</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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<pre style="margin: 0;">+<span id="LC123" class="line" lang="haskell"><span class="n" style="color: #333;">matchGuards</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LetStmt</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">binds</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">stmts</span><span class="p">)</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;"><span class="idiff left">deltas</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC124" class="line" lang="haskell"> <span class="n" style="color: #333;">match_result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchGuards</span> <span class="n" style="color: #333;">stmts</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;"><span class="idiff left">deltas</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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<pre style="margin: 0;"> <span id="LC125" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">adjustMatchResultDs</span> <span class="p">(</span><span class="n" style="color: #333;">dsLocalBinds</span> <span class="n" style="color: #333;">binds</span><span class="p">)</span> <span class="n" style="color: #333;">match_result</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC126" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB the dsLet occurs inside the match_result</span></span>
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<pre style="margin: 0;"> <span id="LC127" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Reason: dsLet takes the body expression as its argument</span></span>
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<pre style="margin: 0;"> <span id="LC128" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- so we can't desugar the bindings without the</span></span>
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<pre style="margin: 0;"> <span id="LC129" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- body expression in hand</span></span>
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<pre style="margin: 0;"> <span id="LC130" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC127" class="line" lang="haskell"><span class="n" style="color: #333;">matchGuards</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">BindStmt</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">bind_rhs</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">stmts</span><span class="p">)</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC131" class="line" lang="haskell"><span class="n" style="color: #333;">matchGuards</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">BindStmt</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">bind_rhs</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">stmts</span><span class="p">)</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;"><span class="idiff left">deltas</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;"> <span id="LC132" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">upat</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">pat</span></span>
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133
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<pre style="margin: 0;"> <span id="LC133" class="line" lang="haskell"> <span class="n" style="color: #333;">match_var</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">selectMatchVar</span> <span class="kt" style="color: #458; font-weight: 600;">Many</span> <span class="n" style="color: #333;">upat</span></span>
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130
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134
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<pre style="margin: 0;"> <span id="LC134" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We only allow unrestricted patterns in guard, hence the `Many`</span></span>
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135
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<pre style="margin: 0;"> <span id="LC135" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- above. It isn't clear what linear patterns would mean, maybe we will</span></span>
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132
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136
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<pre style="margin: 0;"> <span id="LC136" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- figure it out in the future.</span></span>
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133
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137
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<pre style="margin: 0;"> <span id="LC137" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC134" class="line" lang="haskell"> <span class="n" style="color: #333;">match_result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchGuards</span> <span class="n" style="color: #333;">stmts</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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138
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<pre style="margin: 0;">+<span id="LC138" class="line" lang="haskell"> <span class="n" style="color: #333;">match_result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchGuards</span> <span class="n" style="color: #333;">stmts</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;"><span class="idiff left">deltas</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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139
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<pre style="margin: 0;"> <span id="LC139" class="line" lang="haskell"> <span class="n" style="color: #333;">core_rhs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsLExpr</span> <span class="n" style="color: #333;">bind_rhs</span></span>
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136
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140
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<pre style="margin: 0;"> <span id="LC140" class="line" lang="haskell"> <span class="n" style="color: #333;">match_result'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchSinglePatVar</span> <span class="n" style="color: #333;">match_var</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StmtCtxt</span> <span class="n" style="color: #333;">ctx</span><span class="p">)</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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141
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<pre style="margin: 0;"> <span id="LC141" class="line" lang="haskell"> <span class="n" style="color: #333;">match_result</span></span>
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138
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<pre style="margin: 0;"> <span id="LC142" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">bindNonRec</span> <span class="n" style="color: #333;">match_var</span> <span class="n" style="color: #333;">core_rhs</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">match_result'</span></span>
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139
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143
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<pre style="margin: 0;"> <span id="LC143" class="line" lang="haskell"></span>
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140
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<pre style="margin: 0;">-<span id="LC140" class="line" lang="haskell"><span class="n" style="color: #333;">matchGuards</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LastStmt</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">:</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"matchGuards LastStmt"</span></span>
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141
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<pre style="margin: 0;">-<span id="LC141" class="line" lang="haskell"><span class="n" style="color: #333;">matchGuards</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ParStmt</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">:</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"matchGuards ParStmt"</span></span>
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142
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<pre style="margin: 0;">-<span id="LC142" class="line" lang="haskell"><span class="n" style="color: #333;">matchGuards</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TransStmt</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">:</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"matchGuards TransStmt"</span></span>
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143
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<pre style="margin: 0;">-<span id="LC143" class="line" lang="haskell"><span class="n" style="color: #333;">matchGuards</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RecStmt</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">:</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"matchGuards RecStmt"</span></span>
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144
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<pre style="margin: 0;">-<span id="LC144" class="line" lang="haskell"><span class="n" style="color: #333;">matchGuards</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ApplicativeStmt</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">:</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span></span>
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144
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<pre style="margin: 0;">+<span id="LC144" class="line" lang="haskell"><span class="n" style="color: #333;">matchGuards</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LastStmt</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">:</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">_</span></span><span class="idiff right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"matchGuards LastStmt"</span></span>
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145
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<pre style="margin: 0;">+<span id="LC145" class="line" lang="haskell"><span class="n" style="color: #333;">matchGuards</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ParStmt</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">:</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">_</span></span><span class="idiff right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"matchGuards ParStmt"</span></span>
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146
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<pre style="margin: 0;">+<span id="LC146" class="line" lang="haskell"><span class="n" style="color: #333;">matchGuards</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TransStmt</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">:</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">_</span></span><span class="idiff right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"matchGuards TransStmt"</span></span>
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147
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<pre style="margin: 0;">+<span id="LC147" class="line" lang="haskell"><span class="n" style="color: #333;">matchGuards</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RecStmt</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">:</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">_</span></span><span class="idiff right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"matchGuards RecStmt"</span></span>
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148
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<pre style="margin: 0;">+<span id="LC148" class="line" lang="haskell"><span class="n" style="color: #333;">matchGuards</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ApplicativeStmt</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">:</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">_</span></span><span class="idiff right"> </span><span class="o" style="font-weight: 600;">=</span></span>
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145
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<pre style="margin: 0;"> <span id="LC149" class="line" lang="haskell"> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"matchGuards ApplicativeLastStmt"</span></span>
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146
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150
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<pre style="margin: 0;"> <span id="LC150" class="line" lang="haskell"></span>
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147
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151
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<pre style="margin: 0;"> <span id="LC151" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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<li id="085703923f9c18f6ac9f926ac9a4c7c7e6d9d9ed">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/855f71a9c639a72833b63cd03061cc92785c2228...23fac6834bba3181c13250aee54a28ddbeb3bddb#085703923f9c18f6ac9f926ac9a4c7c7e6d9d9ed"><strong>compiler/GHC/HsToCore/Match.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_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">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -35,6 +35,7 @@ import GHC.Tc.Utils.Zonk</td>
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35
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types.Evidence</span></span>
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36
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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.Tc.Utils.Monad</span></span>
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37
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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.HsToCore.PmCheck</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.HsToCore.PmCheck.Types</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Deltas</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">initDeltas</span> <span class="p">)</span></span>
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38
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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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39
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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.Literal</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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<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 +66,7 @@ import GHC.Data.FastString</td>
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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.Types.Unique</span></span>
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<pre style="margin: 0;"> <span id="LC67" 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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67
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<pre style="margin: 0;"> <span id="LC68" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC68" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Monad</span><span class="p">(</span> <span class="n" style="color: #333;">unless</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC69" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Monad</span><span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">zipWithM</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff right"> </span> <span class="n" style="color: #333;">unless</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC70" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List.NonEmpty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NonEmpty</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="LC71" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="k" style="font-weight: 600;">qualified</span> <span class="nn" style="color: #555;">Data.List.NonEmpty</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">NEL</span></span>
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<pre style="margin: 0;"> <span id="LC72" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="k" style="font-weight: 600;">qualified</span> <span class="nn" style="color: #555;">Data.Map</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">Map</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">@@ -767,49 +768,47 @@ matchWrapper ctxt mb_scr (MG { mg_alts = L _ matches</td>
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<pre style="margin: 0;"> <span id="LC768" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Pattern match check warnings for /this match-group/.</span></span>
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<pre style="margin: 0;"> <span id="LC769" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- @rhss_deltas@ is a flat list of covered Deltas for each RHS.</span></span>
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<pre style="margin: 0;"> <span id="LC770" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Each Match will split off one Deltas for its RHSs from this.</span></span>
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<pre style="margin: 0;">-<span id="LC770" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;"><span class="idiff left right">rhs</span>s_deltas</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">isMatchContextPmChecked</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">origin</span> <span class="n" style="color: #333;">ctxt</span></span>
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<pre style="margin: 0;">+<span id="LC771" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;"><span class="idiff left right">matche</span>s_deltas</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">isMatchContextPmChecked</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">origin</span> <span class="n" style="color: #333;">ctxt</span></span>
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<pre style="margin: 0;"> <span id="LC772" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">addScrutTmCs</span> <span class="n" style="color: #333;">mb_scr</span> <span class="n" style="color: #333;">new_vars</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC772" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Type and Term Equality Propagation]</span></span>
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<pre style="margin: 0;">-<span id="LC773" class="line" lang="haskell"> <span class="n" style="color: #333;">checkMatches</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DsMatchContext</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">locn</span><span class="p">)</span> <span class="n" style="color: #333;">new_vars</span> <span class="n" style="color: #333;">matches</span></span>
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<pre style="margin: 0;">-<span id="LC774" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="c1" style="color: #998; font-style: italic;">-- Ultimately this will result in passing Nothing</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;">-- to dsGRHSs as match_deltas</span></span>
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<pre style="margin: 0;">+<span id="LC773" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Type and Term Equality Propagation]</span></span>
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<pre style="margin: 0;">+<span id="LC774" class="line" lang="haskell"> <span class="n" style="color: #333;">checkMatches</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DsMatchContext</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">locn</span><span class="p">)</span> <span class="n" style="color: #333;">new_vars</span> <span class="n" style="color: #333;">matches</span></span>
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<pre style="margin: 0;">+<span id="LC775" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">initDeltasMatches</span> <span class="n" style="color: #333;">matches</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC776" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC777" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">eqns_info</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;"><span class="idiff left">mk_eqn_infos</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">matches</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">rhs</span>s_deltas</span></span>
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<pre style="margin: 0;">+<span id="LC777" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">eqns_info</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;"><span class="idiff left">zipWithM</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">mk_eqn_info</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">matches</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">matche</span>s_deltas</span></span>
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<pre style="margin: 0;"> <span id="LC778" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC779" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">result_expr</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">handleWarnings</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC780" class="line" lang="haskell"> <span class="n" style="color: #333;">matchEquations</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">new_vars</span> <span class="n" style="color: #333;">eqns_info</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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<pre style="margin: 0;"> <span id="LC781" 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;">new_vars</span><span class="p">,</span> <span class="n" style="color: #333;">result_expr</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC782" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC783" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- rhss_deltas is a flat list, whereas there are multiple GRHSs per match.</span></span>
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<pre style="margin: 0;">-<span id="LC784" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- mk_eqn_infos will thread rhss_deltas as state through calls to</span></span>
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<pre style="margin: 0;">-<span id="LC785" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- mk_eqn_info, distributing each rhss_deltas to a GRHS.</span></span>
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<pre style="margin: 0;">-<span id="LC786" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_eqn_infos</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">match</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">matches</span><span class="p">)</span> <span class="n" style="color: #333;">rhss_deltas</span></span>
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787
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<pre style="margin: 0;">-<span id="LC787" 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;">info</span><span class="p">,</span> <span class="n" style="color: #333;">rhss_deltas'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mk_eqn_info</span> <span class="n" style="color: #333;">match</span> <span class="n" style="color: #333;">rhss_deltas</span></span>
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<pre style="margin: 0;">-<span id="LC788" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">infos</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mk_eqn_infos</span> <span class="n" style="color: #333;">matches</span> <span class="n" style="color: #333;">rhss_deltas'</span></span>
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<pre style="margin: 0;">-<span id="LC789" 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;">info</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">infos</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC790" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_eqn_infos</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;"> <span id="LC783" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Called once per equation in the match, or alternative in the case</span></span>
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<pre style="margin: 0;">-<span id="LC792" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_eqn_info</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Match</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">m_pats</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">pats</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">m_grhss</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">grhss</span></span><span class="idiff"> </span><span class="p"><span class="idiff">})</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">rhss_deltas</span></span></span>
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<pre style="margin: 0;">-<span id="LC793" class="line" lang="haskell"> <span class="idiff left"> </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">GRHSs</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">grhss'</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</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">grhss</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">let</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">n_grhss</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">length</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">grhss'</span></span></span>
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<pre style="margin: 0;">+<span id="LC784" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_eqn_info</span> <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">LMatch</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">GhcTc</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">LHsExpr</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">GhcTc</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></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">Deltas</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NonEmpty</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Deltas</span></span><span class="p"><span class="idiff">)</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">DsM</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">EquationInfo</span></span></span>
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<pre style="margin: 0;">+<span id="LC785" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">mk_eqn_info</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">L</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</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">Match</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">m_pats</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">pats</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">m_grhss</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">grhss</span></span><span class="idiff"> </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">pat_deltas</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rhss_deltas</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;"> <span id="LC786" 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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787
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<pre style="margin: 0;"> <span id="LC787" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">upats</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">decideBangHood</span> <span class="n" style="color: #333;">dflags</span><span class="p">)</span> <span class="n" style="color: #333;">pats</span></span>
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796
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<pre style="margin: 0;">-<span id="LC796" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Split off one Deltas for each GRHS of the current Match from the</span></span>
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<pre style="margin: 0;">-<span id="LC797" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- flat list of GRHS Deltas *for all matches* (see the call to</span></span>
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<pre style="margin: 0;">-<span id="LC798" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- checkMatches above).</span></span>
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799
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<pre style="margin: 0;">-<span id="LC799" 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;">match_deltas</span><span class="p">,</span> <span class="n" style="color: #333;">rhss_deltas'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitAt</span> <span class="n" style="color: #333;">n_grhss</span> <span class="n" style="color: #333;">rhss_deltas</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;">-- The list of Deltas is empty iff we don't perform any coverage</span></span>
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801
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<pre style="margin: 0;">-<span id="LC801" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- checking, in which case nonEmpty does the right thing by passing</span></span>
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802
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<pre style="margin: 0;">-<span id="LC802" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Nothing.</span></span>
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803
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<pre style="margin: 0;">-<span id="LC803" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">match_result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsGRHSs</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">grhss</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NEL</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">nonEmpty</span> <span class="n" style="color: #333;">match_deltas</span><span class="p">)</span></span>
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804
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<pre style="margin: 0;">-<span id="LC804" 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;">EqnInfo</span> <span class="p">{</span> <span class="n" style="color: #333;">eqn_pats</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">upats</span></span>
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<pre style="margin: 0;">-<span id="LC805" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">eqn_orig</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FromSource</span></span>
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806
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<pre style="margin: 0;">-<span id="LC806" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">eqn_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">match_result</span> <span class="p">}</span></span>
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807
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<pre style="margin: 0;">-<span id="LC807" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">rhss_deltas'</span> <span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC788" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- pat_deltas is the covered set *after* matching the pattern, but</span></span>
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<pre style="margin: 0;">+<span id="LC789" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- before any of the GRHSs. We extend the environment with pat_deltas</span></span>
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790
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<pre style="margin: 0;">+<span id="LC790" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (via updPmDeltas) so that the where-clause of 'grhss' can profit</span></span>
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791
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<pre style="margin: 0;">+<span id="LC791" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- from that knowledge (#18533)</span></span>
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792
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<pre style="margin: 0;">+<span id="LC792" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">match_result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">updPmDeltas</span> <span class="n" style="color: #333;">pat_deltas</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC793" class="line" lang="haskell"> <span class="n" style="color: #333;">dsGRHSs</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">grhss</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="n" style="color: #333;">rhss_deltas</span></span>
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794
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<pre style="margin: 0;">+<span id="LC794" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">EqnInfo</span> <span class="p">{</span> <span class="n" style="color: #333;">eqn_pats</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">upats</span></span>
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795
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<pre style="margin: 0;">+<span id="LC795" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">eqn_orig</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FromSource</span></span>
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796
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<pre style="margin: 0;">+<span id="LC796" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">eqn_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">match_result</span> <span class="p">}</span> <span class="p">}</span></span>
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808
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797
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<pre style="margin: 0;"> <span id="LC797" class="line" lang="haskell"></span>
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809
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798
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<pre style="margin: 0;"> <span id="LC798" class="line" lang="haskell"> <span class="n" style="color: #333;">handleWarnings</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">isGenerated</span> <span class="n" style="color: #333;">origin</span></span>
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810
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799
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<pre style="margin: 0;"> <span id="LC799" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">discardWarningsDs</span></span>
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811
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800
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<pre style="margin: 0;"> <span id="LC800" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">id</span></span>
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812
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801
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<pre style="margin: 0;"> <span id="LC801" class="line" lang="haskell"></span>
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802
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<pre style="margin: 0;">+<span id="LC802" class="line" lang="haskell"> <span class="n" style="color: #333;">initDeltasMatches</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LMatch</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="n" style="color: #333;">b</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Deltas</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span> <span class="kt" style="color: #458; font-weight: 600;">Deltas</span><span class="p">)]</span></span>
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803
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<pre style="margin: 0;">+<span id="LC803" class="line" lang="haskell"> <span class="n" style="color: #333;">initDeltasMatches</span> <span class="n" style="color: #333;">ms</span></span>
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804
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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;">map</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">m</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">initDeltas</span><span class="p">,</span> <span class="n" style="color: #333;">initDeltasGRHSs</span> <span class="p">(</span><span class="n" style="color: #333;">m_grhss</span> <span class="n" style="color: #333;">m</span><span class="p">)))</span> <span class="n" style="color: #333;">ms</span></span>
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805
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<pre style="margin: 0;">+<span id="LC805" class="line" lang="haskell"></span>
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806
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<pre style="margin: 0;">+<span id="LC806" class="line" lang="haskell"> <span class="n" style="color: #333;">initDeltasGRHSs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">GRHSs</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</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;">NonEmpty</span> <span class="kt" style="color: #458; font-weight: 600;">Deltas</span></span>
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807
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<pre style="margin: 0;">+<span id="LC807" class="line" lang="haskell"> <span class="n" style="color: #333;">initDeltasGRHSs</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">expectJust</span> <span class="s" style="color: #d14;">"GRHSs non-empty"</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;">$</span> <span class="kt" style="color: #458; font-weight: 600;">NEL</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">nonEmpty</span></span>
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809
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<pre style="margin: 0;">+<span id="LC809" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">replicate</span> <span class="p">(</span><span class="n" style="color: #333;">length</span> <span class="p">(</span><span class="n" style="color: #333;">grhssGRHSs</span> <span class="n" style="color: #333;">m</span><span class="p">))</span> <span class="n" style="color: #333;">initDeltas</span></span>
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810
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<pre style="margin: 0;">+<span id="LC810" class="line" lang="haskell"></span>
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811
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<pre style="margin: 0;">+<span id="LC811" class="line" lang="haskell"></span>
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813
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812
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<pre style="margin: 0;"> <span id="LC812" class="line" lang="haskell"><span class="n" style="color: #333;">matchEquations</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsMatchContext</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span></span>
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814
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813
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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="p">[</span><span class="kt" style="color: #458; font-weight: 600;">MatchId</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">EquationInfo</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span></span>
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<pre style="margin: 0;"> <span id="LC814" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/855f71a9c639a72833b63cd03061cc92785c2228...23fac6834bba3181c13250aee54a28ddbeb3bddb#c8a27621f82549165d8946ae8e9f467660958059"><strong>compiler/GHC/HsToCore/Monad.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">@@ -407,7 +407,7 @@ getPmDeltas = do { env <- getLclEnv; return (dsl_deltas env) }</td>
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<pre style="margin: 0;"> <span id="LC407" class="line" lang="haskell"><span class="cd">-- | Set the pattern match oracle state within the scope of the given action.</span></span>
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<pre style="margin: 0;"> <span id="LC408" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See 'dsl_deltas'.</span></span>
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<pre style="margin: 0;"> <span id="LC409" class="line" lang="haskell"><span class="n" style="color: #333;">updPmDeltas</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Deltas</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</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;">DsM</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">-<span id="LC410" class="line" lang="haskell"><span class="n" style="color: #333;">updPmDeltas</span> <span class="n" style="color: #333;">delta</span><span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">updLclEnv</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">\</span></span><span class="n" style="color: #333;"><span class="idiff">env</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">env</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">dsl_deltas</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 right">delta</span></span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC410" class="line" lang="haskell"><span class="n" style="color: #333;">updPmDeltas</span> <span class="n" style="color: #333;">delta<span class="idiff left">s</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">updLclEnv</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">\</span></span><span class="n" style="color: #333;"><span class="idiff">env</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">env</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">dsl_deltas</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 right">deltas</span></span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC411" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC412" class="line" lang="haskell"><span class="n" style="color: #333;">getSrcSpanDs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">SrcSpan</span></span>
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<pre style="margin: 0;"> <span id="LC413" class="line" lang="haskell"><span class="n" style="color: #333;">getSrcSpanDs</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;">env</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getLclEnv</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/855f71a9c639a72833b63cd03061cc92785c2228...23fac6834bba3181c13250aee54a28ddbeb3bddb#ac0a6473a902628a18b3a470122e5cc1ce09de14"><strong>compiler/GHC/HsToCore/PmCheck.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">@@ -13,7 +13,7 @@ Pattern Matching Coverage Checking.</td>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.HsToCore.PmCheck</span> <span class="p">(</span></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Checking and printing</span></span>
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<pre style="margin: 0;">-<span id="LC16" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">checkSingle</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkMatches</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkG<span class="idiff left right">uardMatche</span>s</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">checkSingle</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkMatches</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkG<span class="idiff left right">RHS</span>s</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isMatchContextPmChecked</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Type and Term Equality Propagation]</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">@@ -66,6 +66,7 @@ import GHC.Utils.Monad (concatMapM)</td>
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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;">Control.Monad</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">when</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">forM_</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">zipWithM</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC67" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">elemIndex</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC68" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="k" style="font-weight: 600;">qualified</span> <span class="nn" style="color: #555;">Data.Semigroup</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">Semi</span></span>
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<pre style="margin: 0;">+<span id="LC69" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List.NonEmpty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NonEmpty</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="LC70" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC71" 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="LC72" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This module checks pattern matches for:</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">@@ -150,13 +151,11 @@ data GrdTree</td>
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<pre style="margin: 0;"> <span id="LC151" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ @Guard grd t@ will try to match @grd@ and on success continue to match</span></span>
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<pre style="margin: 0;"> <span id="LC152" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- @t@. Falls through if either match fails. Models left-to-right semantics</span></span>
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<pre style="margin: 0;"> <span id="LC153" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- of pattern matching.</span></span>
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<pre style="margin: 0;">-<span id="LC153" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Sequence</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">GrdTree</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">GrdTree</span></span>
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<pre style="margin: 0;">-<span id="LC154" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ @Sequence l r@ first matches against @l@, and then matches all</span></span>
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<pre style="margin: 0;">-<span id="LC155" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- fallen-through values against @r@. Models top-to-bottom semantics of</span></span>
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<pre style="margin: 0;">-<span id="LC156" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- pattern matching.</span></span>
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<pre style="margin: 0;">-<span id="LC157" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Empty</span></span>
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<pre style="margin: 0;">-<span id="LC158" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ A @GrdTree@ that always fails. Most useful for</span></span>
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<pre style="margin: 0;">-<span id="LC159" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Checking EmptyCase]. A neutral element to 'Sequence'.</span></span>
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<pre style="margin: 0;">+<span id="LC154" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Sequence</span> <span class="o" style="font-weight: 600;">!</span><span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">GrdTree</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC155" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ @Sequence (t:ts)@ matches against @t@, and then matches all</span></span>
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<pre style="margin: 0;">+<span id="LC156" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- fallen-through values against @Sequence ts@. Models top-to-bottom semantics</span></span>
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<pre style="margin: 0;">+<span id="LC157" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- of pattern matching.</span></span>
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<pre style="margin: 0;">+<span id="LC158" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- @Sequence []@ always fails; it is useful for Note [Checking EmptyCase].</span></span>
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<pre style="margin: 0;"> <span id="LC159" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC160" class="line" lang="haskell"><span class="cd">-- | The digest of 'checkGrdTree', representing the annotated pattern-match</span></span>
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<pre style="margin: 0;"> <span id="LC161" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- tree. 'redundantAndInaccessibleRhss' can figure out redundant and proper</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">@@ -170,10 +169,10 @@ data AnnotatedTree</td>
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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="kt" style="color: #458; font-weight: 600;">MayDiverge</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">AnnotatedTree</span></span>
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<pre style="margin: 0;"> <span id="LC170" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Asserts that the tree may force diverging values, so not all of its</span></span>
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<pre style="margin: 0;"> <span id="LC171" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- clauses can be redundant.</span></span>
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<pre style="margin: 0;">-<span id="LC173" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">SequenceAnn</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">AnnotatedTree</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">!</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">AnnotatedTree</span></span></span>
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<pre style="margin: 0;">-<span id="LC174" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ <span class="idiff left right">Mirrors 'Sequence' for preserving the skeleton of a 'GrdTree's.</span></span></span>
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<pre style="margin: 0;">-<span id="LC175" 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 right">EmptyAnn</span></span></span>
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<pre style="margin: 0;">-<span id="LC176" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">^ Mirrors 'Empty' for preserving the skeleton of a 'GrdTree's</span>.</span></span>
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<pre style="margin: 0;">+<span id="LC172" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">SequenceAnn</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Deltas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">!</span></span><span class="p"><span class="idiff">[</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">AnnotatedTree</span></span><span class="p"><span class="idiff right">]</span></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;">-- ^ <span class="idiff left right">@SequenceAnn inc ts@ mirrors @'Sequence' ts@ for preserving the</span></span></span>
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<pre style="margin: 0;">+<span id="LC174" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">-- skeleton of a 'GrdTree's @ts@. It also carries the set of incoming values</span></span></span>
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<pre style="margin: 0;">+<span id="LC175" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">@inc@</span>.</span></span>
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<pre style="margin: 0;"> <span id="LC176" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC177" class="line" lang="haskell"><span class="n" style="color: #333;">pprRhsInfo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">RhsInfo</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="LC178" class="line" lang="haskell"><span class="n" style="color: #333;">pprRhsInfo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RealSrcSpan</span> <span class="n" style="color: #333;">rss</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="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">srcSpanStartLine</span> <span class="n" style="color: #333;">rss</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">@@ -189,23 +188,15 @@ instance Outputable GrdTree where</td>
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<pre style="margin: 0;"> <span id="LC188" class="line" lang="haskell"> <span class="n" style="color: #333;">collect_grds</span> <span class="n" style="color: #333;">t</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">t</span><span class="p">,</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="LC189" class="line" lang="haskell"> <span class="n" style="color: #333;">prefix</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;"> <span id="LC190" class="line" lang="haskell"> <span class="n" style="color: #333;">prefix</span> <span class="p">(</span><span class="n" style="color: #333;">s</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">sdocs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">char</span> <span class="sc" style="color: #d14;">'|'</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">s</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">comma</span> <span class="o" style="font-weight: 600;"><+></span><span class="p">)</span> <span class="n" style="color: #333;">sdocs</span></span>
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<pre style="margin: 0;">-<span id="LC192" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Format nested Sequences in blocks "{ grds1; grds2; ... }"</span></span>
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<pre style="margin: 0;">-<span id="LC193" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">t</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">Sequence</span><span class="p">{}</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">braces</span> <span class="p">(</span><span class="n" style="color: #333;">space</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">fsep</span> <span class="p">(</span><span class="n" style="color: #333;">punctuate</span> <span class="n" style="color: #333;">semi</span> <span class="p">(</span><span class="n" style="color: #333;">collect_seqs</span> <span class="n" style="color: #333;">t</span><span class="p">))</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">space</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC194" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC195" class="line" lang="haskell"> <span class="n" style="color: #333;">collect_seqs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Sequence</span> <span class="n" style="color: #333;">l</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;">collect_seqs</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">collect_seqs</span> <span class="n" style="color: #333;">r</span></span>
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196
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<pre style="margin: 0;">-<span id="LC196" class="line" lang="haskell"> <span class="n" style="color: #333;">collect_seqs</span> <span class="n" style="color: #333;">t</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">t</span><span class="p">]</span></span>
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197
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<pre style="margin: 0;">-<span id="LC197" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">Empty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"<empty case>"</span></span>
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<pre style="margin: 0;">+<span id="LC191" 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;">Sequence</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"<empty case>"</span></span>
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192
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<pre style="margin: 0;">+<span id="LC192" 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;">Sequence</span> <span class="n" style="color: #333;">ts</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">braces</span> <span class="p">(</span><span class="n" style="color: #333;">space</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">fsep</span> <span class="p">(</span><span class="n" style="color: #333;">punctuate</span> <span class="n" style="color: #333;">semi</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ts</span><span class="p">))</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">space</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC193" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC194" 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;">AnnotatedTree</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC200" 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;">AccessibleRhs</span> <span class="kr" style="font-weight: 600;">_</span><span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff">info</span></span><span class="p"><span class="idiff">)</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;">pprRhsInfo</span> <span class="n" style="color: #333;">info</span></span>
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<pre style="margin: 0;">+<span id="LC195" 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;">AccessibleRhs</span> <span class="n" style="color: #333;">_<span class="idiff left">delta</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">info</span></span><span class="p"><span class="idiff">)</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">parens</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">_delta</span></span><span class="p"><span class="idiff">)</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;">pprRhsInfo</span> <span class="n" style="color: #333;">info</span></span>
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<pre style="margin: 0;"> <span id="LC196" 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;">InaccessibleRhs</span> <span class="n" style="color: #333;">info</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;">"inaccessible"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pprRhsInfo</span> <span class="n" style="color: #333;">info</span></span>
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<pre style="margin: 0;"> <span id="LC197" 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;">MayDiverge</span> <span class="n" style="color: #333;">t</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;">"div"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">t</span></span>
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<pre style="margin: 0;">-<span id="LC203" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Format nested Sequences in blocks "{ grds1; grds2; ... }"</span></span>
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<pre style="margin: 0;">-<span id="LC204" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">t</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">SequenceAnn</span><span class="p">{}</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">braces</span> <span class="p">(</span><span class="n" style="color: #333;">space</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">fsep</span> <span class="p">(</span><span class="n" style="color: #333;">punctuate</span> <span class="n" style="color: #333;">semi</span> <span class="p">(</span><span class="n" style="color: #333;">collect_seqs</span> <span class="n" style="color: #333;">t</span><span class="p">))</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">space</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC205" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC206" class="line" lang="haskell"> <span class="n" style="color: #333;">collect_seqs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SequenceAnn</span> <span class="n" style="color: #333;">l</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;">collect_seqs</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">collect_seqs</span> <span class="n" style="color: #333;">r</span></span>
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<pre style="margin: 0;">-<span id="LC207" class="line" lang="haskell"> <span class="n" style="color: #333;">collect_seqs</span> <span class="n" style="color: #333;">t</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">t</span><span class="p">]</span></span>
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208
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<pre style="margin: 0;">-<span id="LC208" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">EmptyAnn</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"<empty case>"</span></span>
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198
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<pre style="margin: 0;">+<span id="LC198" 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;">SequenceAnn</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"<empty case>"</span></span>
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199
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<pre style="margin: 0;">+<span id="LC199" 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;">SequenceAnn</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ts</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">braces</span> <span class="p">(</span><span class="n" style="color: #333;">space</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">fsep</span> <span class="p">(</span><span class="n" style="color: #333;">punctuate</span> <span class="n" style="color: #333;">semi</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ts</span><span class="p">))</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">space</span><span class="p">)</span></span>
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200
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<pre style="margin: 0;"> <span id="LC200" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC201" class="line" lang="haskell"><span class="cd">-- | Lift 'addPmCts' over 'Deltas'.</span></span>
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<pre style="margin: 0;"> <span id="LC202" class="line" lang="haskell"><span class="n" style="color: #333;">addPmCtsDeltas</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Deltas</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmCts</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Deltas</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">@@ -264,7 +255,7 @@ checkSingle dflags ctxt@(DsMatchContext kind locn) var p = do</td>
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264
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<pre style="margin: 0;"> <span id="LC255" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Omitting checking this flag emits redundancy warnings twice in obscure</span></span>
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<pre style="margin: 0;"> <span id="LC256" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- cases like #17646.</span></span>
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<pre style="margin: 0;"> <span id="LC257" class="line" lang="haskell"> <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">exhaustive</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">kind</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="kr" style="font-weight: 600;">do</span></span>
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267
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<pre style="margin: 0;">-<span id="LC267" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- TODO: This could probably call checkMatches, like checkG<span class="idiff left right">uardMatche</span>s.</span></span>
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<pre style="margin: 0;">+<span id="LC258" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- TODO: This could probably call checkMatches, like checkG<span class="idiff left right">RHS</span>s.</span></span>
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<pre style="margin: 0;"> <span id="LC259" class="line" lang="haskell"> <span class="n" style="color: #333;">missing</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getPmDeltas</span></span>
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<pre style="margin: 0;"> <span id="LC260" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"checkSingle: missing"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">missing</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC261" class="line" lang="haskell"> <span class="n" style="color: #333;">fam_insts</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsGetFamInstEnvs</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">@@ -274,12 +265,12 @@ checkSingle dflags ctxt@(DsMatchContext kind locn) var p = do</td>
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274
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<pre style="margin: 0;"> <span id="LC265" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC266" class="line" lang="haskell"><span class="cd">-- | Exhaustive for guard matches, is used for guards in pattern bindings and</span></span>
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<pre style="margin: 0;"> <span id="LC267" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- in @MultiIf@ expressions. Returns the 'Deltas' covered by the RHSs.</span></span>
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277
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<pre style="margin: 0;">-<span id="LC277" class="line" lang="haskell"><span class="n" style="color: #333;">checkG<span class="idiff left right">uardMatche</span>s</span></span>
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<pre style="margin: 0;">+<span id="LC268" class="line" lang="haskell"><span class="n" style="color: #333;">checkG<span class="idiff left right">RHS</span>s</span></span>
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<pre style="margin: 0;"> <span id="LC269" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsMatchContext</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Match context, for warning messages</span></span>
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<pre style="margin: 0;"> <span id="LC270" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">GRHSs</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ The GRHSs to check</span></span>
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<pre style="margin: 0;">-<span id="LC280" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p"><span class="idiff left">[</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Deltas</span></span><span class="p"><span class="idiff">]</span></span><span class="idiff right"> </span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Covered 'Deltas' for each RHS, for long</span></span>
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<pre style="margin: 0;">+<span id="LC271" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NonEmpty</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Deltas</span></span><span class="p"><span class="idiff right">)</span></span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Covered 'Deltas' for each RHS, for long</span></span>
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<pre style="margin: 0;"> <span id="LC272" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- distance info</span></span>
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<pre style="margin: 0;">-<span id="LC282" class="line" lang="haskell"><span class="n" style="color: #333;">checkG<span class="idiff left right">uardMatche</span>s</span> <span class="n" style="color: #333;">hs_ctx</span> <span class="n" style="color: #333;">guards</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GRHSs</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">grhss</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC273" class="line" lang="haskell"><span class="n" style="color: #333;">checkG<span class="idiff left right">RHS</span>s</span> <span class="n" style="color: #333;">hs_ctx</span> <span class="n" style="color: #333;">guards</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GRHSs</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">grhss</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;"> <span id="LC274" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">combinedLoc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldl1</span> <span class="n" style="color: #333;">combineSrcSpans</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">getLoc</span> <span class="n" style="color: #333;">grhss</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC275" class="line" lang="haskell"> <span class="n" style="color: #333;">dsMatchContext</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">DsMatchContext</span> <span class="n" style="color: #333;">hs_ctx</span> <span class="n" style="color: #333;">combinedLoc</span></span>
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<pre style="margin: 0;"> <span id="LC276" class="line" lang="haskell"> <span class="n" style="color: #333;">match</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">combinedLoc</span> <span class="o" style="font-weight: 600;">$</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">@@ -287,7 +278,8 @@ checkGuardMatches hs_ctx guards@(GRHSs _ grhss _) = do</td>
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<pre style="margin: 0;"> <span id="LC278" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">m_ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_ctx</span></span>
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<pre style="margin: 0;"> <span id="LC279" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">m_pats</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;"> <span id="LC280" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">m_grhss</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">guards</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC290" class="line" lang="haskell"> <span class="n" style="color: #333;">checkMatches</span> <span class="n" style="color: #333;">dsMatchContext</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="p">[</span><span class="n" style="color: #333;">match</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC281" class="line" lang="haskell"> <span class="p">[(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">deltas</span><span class="p">)]</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkMatches</span> <span class="n" style="color: #333;">dsMatchContext</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="p">[</span><span class="n" style="color: #333;">match</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC282" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">deltas</span></span>
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<pre style="margin: 0;"> <span id="LC283" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC284" class="line" lang="haskell"><span class="cd">-- | Check a list of syntactic /match/es (part of case, functions, etc.), each</span></span>
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<pre style="margin: 0;"> <span id="LC285" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- with a /pat/ and one or more /grhss/:</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="298" 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">@@ -306,10 +298,9 @@ checkMatches</td>
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<pre style="margin: 0;"> <span id="LC298" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DsMatchContext</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Match context, for warnings messages</span></span>
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307
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<pre style="margin: 0;"> <span id="LC299" 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;">-- ^ Match variables, i.e. x and y above</span></span>
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308
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<pre style="margin: 0;"> <span id="LC300" 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;">LMatch</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">)]</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ List of matches</span></span>
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309
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<pre style="margin: 0;">-<span id="LC309" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Deltas</span></span><span class="p"><span class="idiff">]</span></span><span class="idiff right"> </span> <span class="c1" style="color: #998; font-style: italic;">-- ^ One covered 'Deltas' per RHS, for long</span></span>
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<pre style="margin: 0;">+<span id="LC301" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">[<span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Deltas</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NonEmpty</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Deltas</span></span><span class="p"><span class="idiff right">)]</span></span> <span class="c1" style="color: #998; font-style: italic;">-- ^ One covered 'Deltas' per RHS, for long</span></span>
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310
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<pre style="margin: 0;"> <span id="LC302" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- distance info.</span></span>
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<pre style="margin: 0;"> <span id="LC303" class="line" lang="haskell"><span class="n" style="color: #333;">checkMatches</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">vars</span> <span class="n" style="color: #333;">matches</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">-<span id="LC312" class="line" lang="haskell"> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getDynFlags</span></span>
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<pre style="margin: 0;"> <span id="LC304" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"checkMatches"</span> <span class="p">(</span><span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ctxt</span></span>
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<pre style="margin: 0;"> <span id="LC305" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">vars</span></span>
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<pre style="margin: 0;"> <span id="LC306" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Matches:"</span><span class="p">])</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="322" 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">@@ -322,25 +313,45 @@ checkMatches ctxt vars matches = do</td>
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<pre style="margin: 0;"> <span id="LC313" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">|</span> <span class="p">[</span><span class="n" style="color: #333;">var</span><span class="p">]</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">vars</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addPmCtDeltas</span> <span class="n" style="color: #333;">init_deltas</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmNotBotCt</span> <span class="n" style="color: #333;">var</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC314" 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;">pure</span> <span class="n" style="color: #333;">init_deltas</span></span>
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<pre style="margin: 0;"> <span id="LC315" class="line" lang="haskell"> <span class="n" style="color: #333;">fam_insts</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsGetFamInstEnvs</span></span>
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<pre style="margin: 0;">-<span id="LC325" class="line" lang="haskell"> <span class="n" style="color: #333;">grd_tree</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;"><span class="idiff left">mkGrdTreeMany</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">[]</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">mapM</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">translateMatch</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fam_insts</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">vars</span></span><span class="p"><span class="idiff right">)</span></span> <span class="n" style="color: #333;">matches</span></span>
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<pre style="margin: 0;">+<span id="LC316" class="line" lang="haskell"> <span class="n" style="color: #333;">grd_tree</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;"><span class="idiff left">translateMatches</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fam_insts</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">vars</span></span> <span class="n" style="color: #333;">matches</span></span>
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<pre style="margin: 0;"> <span id="LC317" 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;">checkGrdTree</span> <span class="n" style="color: #333;">grd_tree</span> <span class="n" style="color: #333;">missing</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="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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<pre style="margin: 0;"> <span id="LC320" class="line" lang="haskell"> <span class="n" style="color: #333;">dsPmWarn</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">vars</span> <span class="n" style="color: #333;">res</span></span>
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<pre style="margin: 0;"> <span id="LC321" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC330" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">extractRhsDeltas</span> <span class="n" style="color: #333;"><span class="idiff left">init_deltas</span></span><span class="idiff right"> </span><span class="p">(</span><span class="n" style="color: #333;">cr_clauses</span> <span class="n" style="color: #333;">res</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC322" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">extractRhsDeltas</span> <span class="p">(</span><span class="n" style="color: #333;">cr_clauses</span> <span class="n" style="color: #333;">res</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC323" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC332" class="line" lang="haskell"><span class="cd">-- | Extract the 'Deltas' reaching the RHSs of the 'AnnotatedTree'.</span></span>
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<pre style="margin: 0;">+<span id="LC324" class="line" lang="haskell"><span class="cd">-- | Extract the 'Deltas' reaching the RHSs of the 'AnnotatedTree' for a match</span></span>
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<pre style="margin: 0;">+<span id="LC325" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- group.</span></span>
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<pre style="margin: 0;"> <span id="LC326" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- For 'AccessibleRhs's, this is stored in the tree node, whereas</span></span>
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<pre style="margin: 0;"> <span id="LC327" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'InaccessibleRhs's fall back to the supplied original 'Deltas'.</span></span>
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<pre style="margin: 0;"> <span id="LC328" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See @Note [Recovering from unsatisfiable pattern-matching constraints]@.</span></span>
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<pre style="margin: 0;">-<span id="LC336" class="line" lang="haskell"><span class="n" style="color: #333;">extractRhsDeltas</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Deltas</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">AnnotatedTree</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></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 right">Deltas</span></span><span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC337" class="line" lang="haskell"><span class="n" style="color: #333;">extractRhsDeltas</span> <span class="n" style="color: #333;"><span class="idiff left">orig_deltas</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">fromOL</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 right">go</span></span></span>
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<pre style="margin: 0;">+<span id="LC329" class="line" lang="haskell"><span class="n" style="color: #333;">extractRhsDeltas</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">AnnotatedTree</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></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">Deltas</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NonEmpty</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Deltas</span></span><span class="p"><span class="idiff right">)</span>]</span></span>
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<pre style="margin: 0;">+<span id="LC330" class="line" lang="haskell"><span class="n" style="color: #333;">extractRhsDeltas</span> <span class="o" style="font-weight: 600;"><span class="idiff left">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">go_matches</span></span></span>
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<pre style="margin: 0;"> <span id="LC331" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC339" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AccessibleRhs</span> <span class="n" style="color: #333;">deltas</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;">unitOL</span> <span class="n" style="color: #333;">deltas</span></span>
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<pre style="margin: 0;">-<span id="LC340" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">InaccessibleRhs</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;">unitOL</span> <span class="n" style="color: #333;">orig_deltas</span></span>
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<pre style="margin: 0;">-<span id="LC341" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MayDiverge</span> <span class="n" style="color: #333;">t</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;">t</span></span>
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<pre style="margin: 0;">-<span id="LC342" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SequenceAnn</span> <span class="n" style="color: #333;">l</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;">go</span> <span class="n" style="color: #333;">l</span> <span class="kt" style="color: #458; font-weight: 600;">Semi</span><span class="o" style="font-weight: 600;">.<></span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">r</span></span>
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<pre style="margin: 0;">-<span id="LC343" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kt" style="color: #458; font-weight: 600;">EmptyAnn</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nilOL</span></span>
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<pre style="margin: 0;">+<span id="LC332" class="line" lang="haskell"> <span class="n" style="color: #333;">go_matches</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">AnnotatedTree</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Deltas</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span> <span class="kt" style="color: #458; font-weight: 600;">Deltas</span><span class="p">)]</span></span>
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<pre style="margin: 0;">+<span id="LC333" class="line" lang="haskell"> <span class="n" style="color: #333;">go_matches</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SequenceAnn</span> <span class="n" style="color: #333;">def</span> <span class="n" style="color: #333;">ts</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">go_match</span> <span class="n" style="color: #333;">def</span><span class="p">)</span> <span class="n" style="color: #333;">ts</span> <span class="c1" style="color: #998; font-style: italic;">-- -XEmptyCase handled here!</span></span>
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<pre style="margin: 0;">+<span id="LC334" class="line" lang="haskell"> <span class="n" style="color: #333;">go_matches</span> <span class="n" style="color: #333;">t</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"extractRhsDeltas.go_matches"</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Matches must start with SequenceAnn. But was"</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">t</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC335" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC336" class="line" lang="haskell"> <span class="n" style="color: #333;">go_match</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Deltas</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">AnnotatedTree</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Deltas</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span> <span class="kt" style="color: #458; font-weight: 600;">Deltas</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC337" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- There is no -XEmptyCase at this level, only at the Matches level. So @ts@</span></span>
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<pre style="margin: 0;">+<span id="LC338" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- is non-empty!</span></span>
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<pre style="margin: 0;">+<span id="LC339" class="line" lang="haskell"> <span class="n" style="color: #333;">go_match</span> <span class="n" style="color: #333;">def</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SequenceAnn</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">ts</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">pat</span><span class="p">,</span> <span class="n" style="color: #333;">foldMap1</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"go_match: empty SequenceAnn"</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">go_grhss</span> <span class="n" style="color: #333;">def</span><span class="p">)</span> <span class="n" style="color: #333;">ts</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC340" class="line" lang="haskell"> <span class="n" style="color: #333;">go_match</span> <span class="n" style="color: #333;">def</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MayDiverge</span> <span class="n" style="color: #333;">t</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go_match</span> <span class="n" style="color: #333;">def</span> <span class="n" style="color: #333;">t</span></span>
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<pre style="margin: 0;">+<span id="LC341" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Even if there's only a single GRHS, we wrap it in a SequenceAnn for the</span></span>
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<pre style="margin: 0;">+<span id="LC342" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Deltas covered by the pattern. So the remaining cases are impossible!</span></span>
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<pre style="margin: 0;">+<span id="LC343" class="line" lang="haskell"> <span class="n" style="color: #333;">go_match</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">t</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"extractRhsDeltas.go_match"</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Single GRHS must be wrapped in SequenceAnn. But got "</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">t</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC344" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC345" class="line" lang="haskell"> <span class="n" style="color: #333;">go_grhss</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Deltas</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">AnnotatedTree</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span> <span class="kt" style="color: #458; font-weight: 600;">Deltas</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;">-- There is no -XEmptyCase at this level, only at the Matches level. So @ts@</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;">-- is non-empty!</span></span>
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<pre style="margin: 0;">+<span id="LC348" class="line" lang="haskell"> <span class="n" style="color: #333;">go_grhss</span> <span class="n" style="color: #333;">def</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SequenceAnn</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ts</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldMap1</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"go_grhss: empty SequenceAnn"</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">go_grhss</span> <span class="n" style="color: #333;">def</span><span class="p">)</span> <span class="n" style="color: #333;">ts</span></span>
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<pre style="margin: 0;">+<span id="LC349" class="line" lang="haskell"> <span class="n" style="color: #333;">go_grhss</span> <span class="n" style="color: #333;">def</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MayDiverge</span> <span class="n" style="color: #333;">t</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go_grhss</span> <span class="n" style="color: #333;">def</span> <span class="n" style="color: #333;">t</span></span>
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<pre style="margin: 0;">+<span id="LC350" class="line" lang="haskell"> <span class="n" style="color: #333;">go_grhss</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AccessibleRhs</span> <span class="n" style="color: #333;">deltas</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;">deltas</span> <span class="o" style="font-weight: 600;">:|</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;">+<span id="LC351" class="line" lang="haskell"> <span class="n" style="color: #333;">go_grhss</span> <span class="n" style="color: #333;">def</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">InaccessibleRhs</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;">def</span> <span class="o" style="font-weight: 600;">:|</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;">+<span id="LC352" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC353" class="line" lang="haskell"> <span class="n" style="color: #333;">foldMap1</span> <span class="n" style="color: #333;">msg</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;">pprPanic</span> <span class="s" style="color: #d14;">"extractRhsDeltas.foldMap1"</span> <span class="n" style="color: #333;">msg</span></span>
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<pre style="margin: 0;">+<span id="LC354" class="line" lang="haskell"> <span class="n" style="color: #333;">foldMap1</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">xs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldl'</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">acc</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">acc</span> <span class="kt" style="color: #458; font-weight: 600;">Semi</span><span class="o" style="font-weight: 600;">.<></span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="n" style="color: #333;">xs</span></span>
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<pre style="margin: 0;"> <span id="LC355" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC356" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Checking EmptyCase]</span></span>
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<pre style="margin: 0;"> <span id="LC357" 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">@@ -629,34 +640,43 @@ translateConPatOut fam_insts x con univ_tys ex_tvs dicts = \case</td>
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<pre style="margin: 0;"> <span id="LC640" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 1. 2. 3.</span></span>
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<pre style="margin: 0;"> <span id="LC641" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">con_grd</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">bang_grds</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">arg_grds</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC642" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC632" class="line" lang="haskell"><span class="n" style="color: #333;">mkGrdTreeRhs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Located</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;">GrdVec</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">GrdTree</span></span>
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<pre style="margin: 0;">-<span id="LC633" class="line" lang="haskell"><span class="n" style="color: #333;">mkGrdTreeRhs</span> <span class="n" style="color: #333;">sdoc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="kt" style="color: #458; font-weight: 600;">Guard</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Rhs</span> <span class="n" style="color: #333;">sdoc</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC634" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC635" class="line" lang="haskell"><span class="n" style="color: #333;">mkGrdTreeMany</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">GrdVec</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">GrdTree</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">GrdTree</span></span>
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<pre style="margin: 0;">-<span id="LC636" class="line" lang="haskell"><span class="n" style="color: #333;">mkGrdTreeMany</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="kt" style="color: #458; font-weight: 600;">Empty</span></span>
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<pre style="margin: 0;">-<span id="LC637" class="line" lang="haskell"><span class="n" style="color: #333;">mkGrdTreeMany</span> <span class="n" style="color: #333;">grds</span> <span class="n" style="color: #333;">trees</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="kt" style="color: #458; font-weight: 600;">Guard</span> <span class="p">(</span><span class="n" style="color: #333;">foldr1</span> <span class="kt" style="color: #458; font-weight: 600;">Sequence</span> <span class="n" style="color: #333;">trees</span><span class="p">)</span> <span class="n" style="color: #333;">grds</span></span>
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<pre style="margin: 0;">+<span id="LC643" class="line" lang="haskell"><span class="cd">-- | Translate a the 'Match'es of a 'MatchGroup'</span></span>
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<pre style="margin: 0;">+<span id="LC644" class="line" lang="haskell"><span class="n" style="color: #333;">translateMatches</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FamInstEnvs</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LMatch</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">)]</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;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">GrdTree</span></span>
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<pre style="margin: 0;">+<span id="LC646" class="line" lang="haskell"><span class="n" style="color: #333;">translateMatches</span> <span class="n" style="color: #333;">fam_insts</span> <span class="n" style="color: #333;">vars</span> <span class="n" style="color: #333;">matches</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC647" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- It's important that we wrap a 'Sequence' even if it only wraps a singleton.</span></span>
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<pre style="margin: 0;">+<span id="LC648" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 'extractRhsDeltas' needs this to recover 'MatchGroup' structure.</span></span>
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<pre style="margin: 0;">+<span id="LC649" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Sequence</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">traverse</span> <span class="p">(</span><span class="n" style="color: #333;">translateMatch</span> <span class="n" style="color: #333;">fam_insts</span> <span class="n" style="color: #333;">vars</span><span class="p">)</span> <span class="n" style="color: #333;">matches</span></span>
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<pre style="margin: 0;"> <span id="LC650" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC651" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Translate a single match</span></span>
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<pre style="margin: 0;"> <span id="LC652" class="line" lang="haskell"><span class="n" style="color: #333;">translateMatch</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FamInstEnvs</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LMatch</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">)</span></span>
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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="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">GrdTree</span></span>
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<pre style="margin: 0;"> <span id="LC654" class="line" lang="haskell"><span class="n" style="color: #333;">translateMatch</span> <span class="n" style="color: #333;">fam_insts</span> <span class="n" style="color: #333;">vars</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">match_loc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Match</span> <span class="p">{</span> <span class="n" style="color: #333;">m_pats</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pats</span><span class="p">,</span> <span class="n" style="color: #333;">m_grhss</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">grhss</span> <span class="p">}))</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">-<span id="LC643" class="line" lang="haskell"> <span class="n" style="color: #333;">pats'</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">concat</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">zipWithM</span> <span class="p">(</span><span class="n" style="color: #333;">translateLPat</span> <span class="n" style="color: #333;">fam_insts</span><span class="p">)</span> <span class="n" style="color: #333;">vars</span> <span class="n" style="color: #333;">pats</span></span>
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<pre style="margin: 0;">-<span id="LC644" class="line" lang="haskell"> <span class="n" style="color: #333;">grhss'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;"><span class="idiff left">mapM</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">translateLGRHS</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fam_insts</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">match_loc</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pats</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">grhssGRHSs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">grhss</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">-<span id="LC645" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- tracePm "translateMatch" (vcat [ppr pats, ppr pats', ppr grhss<span class="idiff left right">, ppr grhss</span>'])</span></span>
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<pre style="margin: 0;">-<span id="LC646" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">mkGrdTreeMany</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pats'</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">grhs</span>s'</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC655" class="line" lang="haskell"> <span class="n" style="color: #333;">pats'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">concat</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">zipWithM</span> <span class="p">(</span><span class="n" style="color: #333;">translateLPat</span> <span class="n" style="color: #333;">fam_insts</span><span class="p">)</span> <span class="n" style="color: #333;">vars</span> <span class="n" style="color: #333;">pats</span></span>
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<pre style="margin: 0;">+<span id="LC656" class="line" lang="haskell"> <span class="n" style="color: #333;">grhss'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;"><span class="idiff left">translateGRHSs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fam_insts</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">match_loc</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">sep</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">map</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pats</span></span><span class="p"><span class="idiff">))</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">grhss</span></span></span>
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<pre style="margin: 0;">+<span id="LC657" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- tracePm "translateMatch" (vcat [ppr pats, ppr pats', ppr grhss'])</span></span>
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<pre style="margin: 0;">+<span id="LC658" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">foldr</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Guard</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">grhss'</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">pat</span>s'</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC659" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC648" 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="LC649" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Transform source guards (GuardStmt Id) to simpler PmGrds</span></span>
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<pre style="margin: 0;">+<span id="LC660" class="line" lang="haskell"><span class="n" style="color: #333;">mkGrdTreeRhs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Located</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;">GrdVec</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">GrdTree</span></span>
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<pre style="margin: 0;">+<span id="LC661" class="line" lang="haskell"><span class="n" style="color: #333;">mkGrdTreeRhs</span> <span class="n" style="color: #333;">sdoc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="kt" style="color: #458; font-weight: 600;">Guard</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Rhs</span> <span class="n" style="color: #333;">sdoc</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC662" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC663" class="line" lang="haskell"><span class="n" style="color: #333;">translateGRHSs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FamInstEnvs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SrcSpan</span> <span class="o" style="font-weight: 600;">-></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;">GRHSs</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">GrdTree</span></span>
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<pre style="margin: 0;">+<span id="LC664" class="line" lang="haskell"><span class="n" style="color: #333;">translateGRHSs</span> <span class="n" style="color: #333;">fam_insts</span> <span class="n" style="color: #333;">match_loc</span> <span class="n" style="color: #333;">pp_pats</span> <span class="n" style="color: #333;">grhss</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC665" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- It's important that we wrap a 'Sequence' even if it only wraps a singleton.</span></span>
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<pre style="margin: 0;">+<span id="LC666" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 'extractRhsDeltas' needs this to recover 'GRHSs' structure.</span></span>
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<pre style="margin: 0;">+<span id="LC667" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Sequence</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">traverse</span> <span class="p">(</span><span class="n" style="color: #333;">translateLGRHS</span> <span class="n" style="color: #333;">fam_insts</span> <span class="n" style="color: #333;">match_loc</span> <span class="n" style="color: #333;">pp_pats</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">grhssGRHSs</span> <span class="n" style="color: #333;">grhss</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC668" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC669" class="line" lang="haskell"><span class="cd">-- | Translate a guarded right-hand side to a single 'GrdTree'</span></span>
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<pre style="margin: 0;">-<span id="LC652" class="line" lang="haskell"><span class="n" style="color: #333;">translateLGRHS</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FamInstEnvs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SrcSpan</span> <span class="o" style="font-weight: 600;">-></span> <span class="p"><span class="idiff left">[</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">LPat</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">GhcTc</span></span><span class="p"><span class="idiff right">]</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LGRHS</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">GrdTree</span></span>
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<pre style="margin: 0;">-<span id="LC653" class="line" lang="haskell"><span class="n" style="color: #333;">translateLGRHS</span> <span class="n" style="color: #333;">fam_insts</span> <span class="n" style="color: #333;">match_loc</span> <span class="n" style="color: #333;">pats</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">_loc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GRHS</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">gs</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">-<span id="LC654" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- _loc <span class="idiff left right">apparently points to the match separator</span> that comes after the guards..</span></span>
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<pre style="margin: 0;">+<span id="LC670" class="line" lang="haskell"><span class="n" style="color: #333;">translateLGRHS</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FamInstEnvs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SrcSpan</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">SDoc</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LGRHS</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">GrdTree</span></span>
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<pre style="margin: 0;">+<span id="LC671" class="line" lang="haskell"><span class="n" style="color: #333;">translateLGRHS</span> <span class="n" style="color: #333;">fam_insts</span> <span class="n" style="color: #333;">match_loc</span> <span class="n" style="color: #333;">p<span class="idiff left right">p_p</span>ats</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">_loc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GRHS</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">gs</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC672" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- _loc <span class="idiff left right">points to the match separator (ie =, ->)</span> that comes after the guards..</span></span>
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<pre style="margin: 0;"> <span id="LC673" class="line" lang="haskell"> <span class="n" style="color: #333;">mkGrdTreeRhs</span> <span class="n" style="color: #333;">loc_sdoc</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">concatMapM</span> <span class="p">(</span><span class="n" style="color: #333;">translateGuard</span> <span class="n" style="color: #333;">fam_insts</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">unLoc</span><span class="p">)</span> <span class="n" style="color: #333;">gs</span></span>
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<pre style="margin: 0;"> <span id="LC674" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC675" class="line" lang="haskell"> <span class="n" style="color: #333;">loc_sdoc</span></span>
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<pre style="margin: 0;">-<span id="LC658" 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;">gs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">match_loc</span> <span class="p">(</span><span class="n" style="color: #333;">sep</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">pats</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC659" 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;">L</span> <span class="n" style="color: #333;">grd_loc</span> <span class="p">(</span><span class="n" style="color: #333;">sep</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">pats</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">vbar</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">interpp'SP</span> <span class="n" style="color: #333;">gs</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC676" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- pp_pats is the space-separated pattern of the current Match this</span></span>
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<pre style="margin: 0;">+<span id="LC677" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- GRHS belongs to, so the @A B x@ part in @A B x | 0 <- x@.</span></span>
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<pre style="margin: 0;">+<span id="LC678" 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;">gs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">match_loc</span> <span class="n" style="color: #333;">pp_pats</span></span>
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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="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">grd_loc</span> <span class="p">(</span><span class="n" style="color: #333;">pp_pats</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">vbar</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">interpp'SP</span> <span class="n" style="color: #333;">gs</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC680" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">grd_loc</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">head</span> <span class="n" style="color: #333;">gs</span></span>
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681
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<pre style="margin: 0;"> <span id="LC681" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC682" class="line" lang="haskell"><span class="cd">-- | Translate a guard statement to a 'GrdVec'</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">@@ -971,6 +991,7 @@ checkGrdTree' (Guard (PmCon x con tvs dicts args) tree) deltas = do</td>
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<pre style="margin: 0;"> <span id="LC991" class="line" lang="haskell"> <span class="n" style="color: #333;">unc_this</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addPmCtDeltas</span> <span class="n" style="color: #333;">deltas</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmNotConCt</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC992" class="line" lang="haskell"> <span class="n" style="color: #333;">deltas'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addPmCtsDeltas</span> <span class="n" style="color: #333;">deltas</span> <span class="o" style="font-weight: 600;">$</span></span>
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993
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<pre style="margin: 0;"> <span id="LC993" class="line" lang="haskell"> <span class="n" style="color: #333;">listToBag</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmTyCt</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">evVarPred</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">dicts</span><span class="p">)</span> <span class="p">`</span><span class="n" style="color: #333;">snocBag</span><span class="p">`</span> <span class="kt" style="color: #458; font-weight: 600;">PmConCt</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">+<span id="LC994" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- tracePm "checkGrdTree:Con" (ppr deltas $$ ppr x $$ ppr con $$ ppr dicts $$ ppr deltas')</span></span>
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995
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<pre style="margin: 0;"> <span id="LC995" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CheckResult</span> <span class="n" style="color: #333;">tree'</span> <span class="n" style="color: #333;">unc_inner</span> <span class="n" style="color: #333;">prec</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkGrdTree'</span> <span class="n" style="color: #333;">tree</span> <span class="n" style="color: #333;">deltas'</span></span>
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<pre style="margin: 0;"> <span id="LC996" class="line" lang="haskell"> <span class="n" style="color: #333;">limit</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">maxPmCheckModels</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">getDynFlags</span></span>
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<pre style="margin: 0;"> <span id="LC997" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">prec'</span><span class="p">,</span> <span class="n" style="color: #333;">unc'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">throttle</span> <span class="n" style="color: #333;">limit</span> <span class="n" style="color: #333;">deltas</span> <span class="p">(</span><span class="n" style="color: #333;">unc_this</span> <span class="kt" style="color: #458; font-weight: 600;">Semi</span><span class="o" style="font-weight: 600;">.<></span> <span class="n" style="color: #333;">unc_inner</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">@@ -979,19 +1000,21 @@ checkGrdTree' (Guard (PmCon x con tvs dicts args) tree) deltas = do</td>
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<pre style="margin: 0;"> <span id="LC1000" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cr_uncov</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unc'</span></span>
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<pre style="margin: 0;"> <span id="LC1001" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cr_approx</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">prec</span> <span class="kt" style="color: #458; font-weight: 600;">Semi</span><span class="o" style="font-weight: 600;">.<></span> <span class="n" style="color: #333;">prec'</span> <span class="p">}</span></span>
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1002
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<pre style="margin: 0;"> <span id="LC1002" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Sequence: Thread residual uncovered sets from equation to equation</span></span>
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<pre style="margin: 0;">-<span id="LC982" class="line" lang="haskell"><span class="n" style="color: #333;">checkGrdTree'</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Sequence</span> <span class="n" style="color: #333;">l</span> <span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="n" style="color: #333;">unc_0</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">-<span id="LC983" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CheckResult</span> <span class="n" style="color: #333;">l'</span> <span class="n" style="color: #333;">unc_1</span> <span class="n" style="color: #333;">prec_l</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkGrdTree'</span> <span class="n" style="color: #333;">l</span> <span class="n" style="color: #333;">unc_0</span></span>
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984
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<pre style="margin: 0;">-<span id="LC984" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CheckResult</span> <span class="n" style="color: #333;">r'</span> <span class="n" style="color: #333;">unc_2</span> <span class="n" style="color: #333;">prec_r</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkGrdTree'</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">unc_1</span></span>
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<pre style="margin: 0;">-<span id="LC985" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">CheckResult</span></span>
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<pre style="margin: 0;">-<span id="LC986" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">cr_clauses</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SequenceAnn</span> <span class="n" style="color: #333;">l'</span> <span class="n" style="color: #333;">r'</span></span>
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<pre style="margin: 0;">-<span id="LC987" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cr_uncov</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unc_2</span></span>
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<pre style="margin: 0;">-<span id="LC988" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cr_approx</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">prec_l</span> <span class="kt" style="color: #458; font-weight: 600;">Semi</span><span class="o" style="font-weight: 600;">.<></span> <span class="n" style="color: #333;">prec_r</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC989" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Empty: Fall through for all values</span></span>
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<pre style="margin: 0;">-<span id="LC990" class="line" lang="haskell"><span class="n" style="color: #333;">checkGrdTree'</span> <span class="kt" style="color: #458; font-weight: 600;">Empty</span> <span class="n" style="color: #333;">unc</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">-<span id="LC991" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">CheckResult</span></span>
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<pre style="margin: 0;">-<span id="LC992" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">cr_clauses</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">EmptyAnn</span></span>
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<pre style="margin: 0;">-<span id="LC993" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cr_uncov</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unc</span></span>
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<pre style="margin: 0;">-<span id="LC994" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cr_approx</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Precise</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1003" class="line" lang="haskell"><span class="n" style="color: #333;">checkGrdTree'</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Sequence</span> <span class="n" style="color: #333;">ts</span><span class="p">)</span> <span class="n" style="color: #333;">init_unc</span> <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;">init_unc</span> <span class="kt" style="color: #458; font-weight: 600;">Precise</span> <span class="n" style="color: #333;">ts</span></span>
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1004
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<pre style="margin: 0;">+<span id="LC1004" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC1005" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | Accumulates a CheckResult. Its type is more like</span></span>
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<pre style="margin: 0;">+<span id="LC1006" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- @CheckResult -> [GrdTree] -> CheckResult@, but cr_clauses is a single</span></span>
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<pre style="margin: 0;">+<span id="LC1007" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 'AnnotatedTree', not a list thereof. Hence 3 parameters to thread the</span></span>
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1008
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<pre style="margin: 0;">+<span id="LC1008" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- fields.</span></span>
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1009
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<pre style="margin: 0;">+<span id="LC1009" 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;">AnnotatedTree</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Deltas</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Precision</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">GrdTree</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">CheckResult</span></span>
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1010
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<pre style="margin: 0;">+<span id="LC1010" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- No cases left: Fall through for all values</span></span>
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1011
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<pre style="margin: 0;">+<span id="LC1011" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ts'</span> <span class="n" style="color: #333;">unc</span> <span class="n" style="color: #333;">prec</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;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">CheckResult</span></span>
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1012
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<pre style="margin: 0;">+<span id="LC1012" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">cr_clauses</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SequenceAnn</span> <span class="n" style="color: #333;">init_unc</span> <span class="p">(</span><span class="n" style="color: #333;">reverse</span> <span class="n" style="color: #333;">ts'</span><span class="p">)</span></span>
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1013
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<pre style="margin: 0;">+<span id="LC1013" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cr_uncov</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unc</span></span>
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1014
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<pre style="margin: 0;">+<span id="LC1014" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cr_approx</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">prec</span> <span class="p">}</span></span>
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1015
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<pre style="margin: 0;">+<span id="LC1015" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ts'</span> <span class="n" style="color: #333;">unc</span> <span class="n" style="color: #333;">prec</span> <span class="p">(</span><span class="n" style="color: #333;">t</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">ts</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1016
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<pre style="margin: 0;">+<span id="LC1016" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CheckResult</span> <span class="n" style="color: #333;">t'</span> <span class="n" style="color: #333;">unc_1</span> <span class="n" style="color: #333;">prec_t</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkGrdTree'</span> <span class="n" style="color: #333;">t</span> <span class="n" style="color: #333;">unc</span></span>
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1017
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<pre style="margin: 0;">+<span id="LC1017" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="n" style="color: #333;">t'</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">ts'</span><span class="p">)</span> <span class="n" style="color: #333;">unc_1</span> <span class="p">(</span><span class="n" style="color: #333;">prec_t</span> <span class="kt" style="color: #458; font-weight: 600;">Semi</span><span class="o" style="font-weight: 600;">.<></span> <span class="n" style="color: #333;">prec</span><span class="p">)</span> <span class="n" style="color: #333;">ts</span></span>
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995
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1018
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<pre style="margin: 0;"> <span id="LC1018" class="line" lang="haskell"></span>
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996
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1019
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<pre style="margin: 0;"> <span id="LC1019" class="line" lang="haskell"><span class="cd">-- | Print diagnostic info and actually call 'checkGrdTree''.</span></span>
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997
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1020
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<pre style="margin: 0;"> <span id="LC1020" class="line" lang="haskell"><span class="n" style="color: #333;">checkGrdTree</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">GrdTree</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Deltas</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">CheckResult</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1117" 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="1140" 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">@@ -1117,8 +1140,7 @@ redundantAndInaccessibleRhss tree = (fromOL ol_red, fromOL ol_inacc)</td>
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1117
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1140
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<pre style="margin: 0;"> <span id="LC1140" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">acc</span><span class="p">,</span> <span class="n" style="color: #333;">inacc</span><span class="p">,</span> <span class="n" style="color: #333;">red</span><span class="p">)</span></span>
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1118
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1141
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<pre style="margin: 0;"> <span id="LC1141" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isNilOL</span> <span class="n" style="color: #333;">acc</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">isNilOL</span> <span class="n" style="color: #333;">inacc</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">nilOL</span><span class="p">,</span> <span class="n" style="color: #333;">red</span><span class="p">,</span> <span class="n" style="color: #333;">nilOL</span><span class="p">)</span></span>
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1119
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<pre style="margin: 0;"> <span id="LC1142" 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;">res</span></span>
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<pre style="margin: 0;">-<span id="LC1120" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SequenceAnn</span> <span class="n" style="color: #333;">l</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;">go</span> <span class="n" style="color: #333;">l</span> <span class="kt" style="color: #458; font-weight: 600;">Semi</span><span class="o" style="font-weight: 600;">.<></span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">r</span></span>
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<pre style="margin: 0;">-<span id="LC1121" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kt" style="color: #458; font-weight: 600;">EmptyAnn</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">nilOL</span><span class="p">,</span> <span class="n" style="color: #333;">nilOL</span><span class="p">,</span> <span class="n" style="color: #333;">nilOL</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="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SequenceAnn</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ts</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldMap</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ts</span></span>
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1144
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<pre style="margin: 0;"> <span id="LC1144" class="line" lang="haskell"></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;">{- Note [Determining inaccessible clauses]</span></span>
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<pre style="margin: 0;"> <span id="LC1146" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<li id="8d8e5922fde8bc19ffa2bc9cae6b6720abb88564">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/855f71a9c639a72833b63cd03061cc92785c2228...23fac6834bba3181c13250aee54a28ddbeb3bddb#8d8e5922fde8bc19ffa2bc9cae6b6720abb88564"><strong>compiler/GHC/HsToCore/PmCheck/Oracle.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1070" 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="1070" 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">@@ -1070,7 +1070,8 @@ ensureAllPossibleMatchesInhabited delta@MkDelta{ delta_tm_st = TmSt env reps }</td>
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<pre style="margin: 0;"> <span id="LC1070" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">runMaybeT</span> <span class="p">(</span><span class="n" style="color: #333;">set_tm_cs_env</span> <span class="n" style="color: #333;">delta</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">traverseSDIE</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">env</span><span class="p">)</span></span>
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1071
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1071
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<pre style="margin: 0;"> <span id="LC1071" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1072
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1072
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<pre style="margin: 0;"> <span id="LC1072" class="line" lang="haskell"> <span class="n" style="color: #333;">set_tm_cs_env</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">delta</span><span class="p">{</span> <span class="n" style="color: #333;">delta_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">reps</span> <span class="p">}</span></span>
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1073
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<pre style="margin: 0;">-<span id="LC1073" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">vi</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="p">(</span><span class="n" style="color: #333;">ensureInhabited</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">vi</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1073" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">vi</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC1074" class="line" lang="haskell"> <span class="n" style="color: #333;">initPossibleMatches</span> <span class="p">(</span><span class="n" style="color: #333;">delta_ty_st</span> <span class="n" style="color: #333;">delta</span><span class="p">)</span> <span class="n" style="color: #333;">vi</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="n" style="color: #333;">ensureInhabited</span> <span class="n" style="color: #333;">delta</span></span>
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1075
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<pre style="margin: 0;"> <span id="LC1075" class="line" lang="haskell"></span>
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1076
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<pre style="margin: 0;"> <span id="LC1076" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--------------------------------------</span></span>
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<pre style="margin: 0;"> <span id="LC1077" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Term oracle unification procedure</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">@@ -1668,7 +1669,7 @@ addCoreCt :: Delta -> Id -> CoreExpr -> MaybeT DsM Delta</td>
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1668
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1669
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<pre style="margin: 0;"> <span id="LC1669" class="line" lang="haskell"><span class="n" style="color: #333;">addCoreCt</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1670
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<pre style="margin: 0;"> <span id="LC1670" class="line" lang="haskell"> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getDynFlags</span></span>
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<pre style="margin: 0;"> <span id="LC1671" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">e'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simpleOptExpr</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;">-<span id="LC1671" class="line" lang="haskell"> <span class="n" style="color: #333;">lift</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"addCoreCt"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">e'</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1672" class="line" lang="haskell"> <span class="n" style="color: #333;">lift</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"addCoreCt"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;"><span class="idiff left"><+></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">dcolon</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">ppr</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">idType</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff right"> </span><span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">e'</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1673" class="line" lang="haskell"> <span class="n" style="color: #333;">execStateT</span> <span class="p">(</span><span class="n" style="color: #333;">core_expr</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e'</span><span class="p">)</span> <span class="n" style="color: #333;">delta</span></span>
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<pre style="margin: 0;"> <span id="LC1674" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC1675" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | Takes apart a 'CoreExpr' and tries to extract as much information about</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/855f71a9c639a72833b63cd03061cc92785c2228...23fac6834bba3181c13250aee54a28ddbeb3bddb#bf951467d4a9aa443cb109cb4c84a2891945649b"><strong>compiler/GHC/Parser.y</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">@@ -1961,7 +1961,7 @@ type :: { LHsType GhcPs }</td>
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<pre style="margin: 0;"> <span id="LC1961" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1962" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">btype</span> <span class="sc" style="color: #d14;">'#</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">-</span><span class="o" style="font-weight: 600;">></span><span class="sc" style="color: #d14;">' </span><span class="err" style="color: #a61717; background-color: #e3d2d2;">c</span><span class="kr" style="font-weight: 600;">type</span> <span class="p">{</span><span class="o" style="font-weight: 600;">%</span> <span class="n" style="color: #333;">hintLinear</span> <span class="p">(</span><span class="n" style="color: #333;">getLoc</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">>></span></span>
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<pre style="margin: 0;"> <span id="LC1963" class="line" lang="haskell"> <span class="n" style="color: #333;">ams</span> <span class="p">(</span><span class="n" style="color: #333;">sLL</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">$></span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">HsFunTy</span> <span class="n" style="color: #333;">noExtField</span> <span class="kt" style="color: #458; font-weight: 600;">HsLinearArrow</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">3</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1964" class="line" lang="haskell"> <span class="p">[</span><span class="n" style="color: #333;">mu</span> <span class="kt" style="color: #458; font-weight: 600;">Ann<span class="idiff left right">Rarrow</span></span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">2</span><span class="p">]</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1964" class="line" lang="haskell"> <span class="p">[</span><span class="n" style="color: #333;">mu</span> <span class="kt" style="color: #458; font-weight: 600;">Ann<span class="idiff left right">Lolly</span></span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">2</span><span class="p">]</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1965" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1966" class="line" lang="haskell"><span class="n" style="color: #333;">mult</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1967" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">btype</span> <span class="p">{</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="p">}</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2089" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2089,10 +2089,10 @@ tv_bndrs :: { [LHsTyVarBndr Specificity GhcPs] }</td>
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<pre style="margin: 0;"> <span id="LC2089" class="line" lang="haskell"><span class="n" style="color: #333;">tv_bndr</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">LHsTyVarBndr</span> <span class="kt" style="color: #458; font-weight: 600;">Specificity</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC2090" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">tv_bndr_no_braces</span> <span class="p">{</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="p">}</span></span>
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2091
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2091
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<pre style="margin: 0;"> <span id="LC2091" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="sc" style="color: #d14;">'{'</span> <span class="n" style="color: #333;">tyvar</span> <span class="sc" style="color: #d14;">'}'</span> <span class="p">{</span><span class="o" style="font-weight: 600;">%</span> <span class="n" style="color: #333;">ams</span> <span class="p">(</span><span class="n" style="color: #333;">sLL</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">$></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UserTyVar</span> <span class="n" style="color: #333;">noExtField</span> <span class="kt" style="color: #458; font-weight: 600;">InferredSpec</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">2</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC2092" class="line" lang="haskell"> <span class="p">[</span><span class="n" style="color: #333;">mo<span class="idiff left">p</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="mi" style="color: #099;"><span class="idiff">1</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">mcp</span></span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">3</span><span class="p">]</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC2092" class="line" lang="haskell"> <span class="p">[</span><span class="n" style="color: #333;">mo<span class="idiff left">c</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="mi" style="color: #099;"><span class="idiff">1</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">mcc</span></span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">3</span><span class="p">]</span> <span class="p">}</span></span>
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2093
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<pre style="margin: 0;"> <span id="LC2093" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="sc" style="color: #d14;">'{'</span> <span class="n" style="color: #333;">tyvar</span> <span class="sc" style="color: #d14;">':</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">:</span><span class="sc" style="color: #d14;">' </span><span class="err" style="color: #a61717; background-color: #e3d2d2;">k</span><span class="n" style="color: #333;">ind</span> <span class="sc" style="color: #d14;">'}'</span> <span class="p">{</span><span class="o" style="font-weight: 600;">%</span> <span class="n" style="color: #333;">ams</span> <span class="p">(</span><span class="n" style="color: #333;">sLL</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">$></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">KindedTyVar</span> <span class="n" style="color: #333;">noExtField</span> <span class="kt" style="color: #458; font-weight: 600;">InferredSpec</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">2</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">4</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC2094" class="line" lang="haskell"> <span class="p">[</span><span class="n" style="color: #333;">mo<span class="idiff left right">p</span></span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">,</span><span class="n" style="color: #333;">mu</span> <span class="kt" style="color: #458; font-weight: 600;">AnnDcolon</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">3</span></span>
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<pre style="margin: 0;">-<span id="LC2095" class="line" lang="haskell"> <span class="p">,</span><span class="n" style="color: #333;">mc<span class="idiff left right">p</span></span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">5</span><span class="p">]</span> <span class="p">}</span></span>
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2094
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<pre style="margin: 0;">+<span id="LC2094" class="line" lang="haskell"> <span class="p">[</span><span class="n" style="color: #333;">mo<span class="idiff left right">c</span></span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">,</span><span class="n" style="color: #333;">mu</span> <span class="kt" style="color: #458; font-weight: 600;">AnnDcolon</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">3</span></span>
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<pre style="margin: 0;">+<span id="LC2095" class="line" lang="haskell"> <span class="p">,</span><span class="n" style="color: #333;">mc<span class="idiff left right">c</span></span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">5</span><span class="p">]</span> <span class="p">}</span></span>
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2096
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<pre style="margin: 0;"> <span id="LC2096" class="line" lang="haskell"></span>
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2097
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<pre style="margin: 0;"> <span id="LC2097" class="line" lang="haskell"><span class="n" style="color: #333;">tv_bndr_no_braces</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">LHsTyVarBndr</span> <span class="kt" style="color: #458; font-weight: 600;">Specificity</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="p">}</span></span>
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2098
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<pre style="margin: 0;"> <span id="LC2098" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">tyvar</span> <span class="p">{</span> <span class="n" style="color: #333;">sL1</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UserTyVar</span> <span class="n" style="color: #333;">noExtField</span> <span class="kt" style="color: #458; font-weight: 600;">SpecifiedSpec</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="p">}</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="3728" 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">@@ -3728,6 +3728,7 @@ isUnicode (L _ (ITcparenbar iu)) = iu == UnicodeSyntax</td>
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3728
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<pre style="margin: 0;"> <span id="LC3728" class="line" lang="haskell"><span class="n" style="color: #333;">isUnicode</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ITopenExpQuote</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">iu</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">iu</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">UnicodeSyntax</span></span>
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3729
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3729
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<pre style="margin: 0;"> <span id="LC3729" class="line" lang="haskell"><span class="n" style="color: #333;">isUnicode</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ITcloseQuote</span> <span class="n" style="color: #333;">iu</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">iu</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">UnicodeSyntax</span></span>
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3730
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3730
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<pre style="margin: 0;"> <span id="LC3730" class="line" lang="haskell"><span class="n" style="color: #333;">isUnicode</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ITstar</span> <span class="n" style="color: #333;">iu</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">iu</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">UnicodeSyntax</span></span>
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3731
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<pre style="margin: 0;">+<span id="LC3731" class="line" lang="haskell"><span class="n" style="color: #333;">isUnicode</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ITlolly</span> <span class="n" style="color: #333;">iu</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">iu</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">UnicodeSyntax</span></span>
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3731
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3732
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<pre style="margin: 0;"> <span id="LC3732" class="line" lang="haskell"><span class="n" style="color: #333;">isUnicode</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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3732
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3733
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<pre style="margin: 0;"> <span id="LC3733" class="line" lang="haskell"></span>
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3733
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3734
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<pre style="margin: 0;"> <span id="LC3734" class="line" lang="haskell"><span class="n" style="color: #333;">hasE</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">Token</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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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/855f71a9c639a72833b63cd03061cc92785c2228...23fac6834bba3181c13250aee54a28ddbeb3bddb#446cb12ca6cefaf1c6eb79b7db643632744263c7"><strong>compiler/GHC/Parser/PostProcess.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">@@ -2612,6 +2612,7 @@ warnPrepositiveQualifiedModule span =</td>
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<pre style="margin: 0;"> <span id="LC2612" 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;">"in prepositive position"</span></span>
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2613
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2613
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<pre style="margin: 0;"> <span id="LC2613" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Suggested fix: place "</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"qualified"</span><span class="p">)</span></span>
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2614
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2614
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<pre style="margin: 0;"> <span id="LC2614" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"after the module name instead."</span></span>
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<pre style="margin: 0;">+<span id="LC2615" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"To allow this, enable language extension 'ImportQualifiedPost'"</span></span>
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2616
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<pre style="margin: 0;"> <span id="LC2616" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2617" class="line" lang="haskell"><span class="n" style="color: #333;">failOpNotEnabledImportQualifiedPost</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SrcSpan</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">P</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC2618" class="line" lang="haskell"><span class="n" style="color: #333;">failOpNotEnabledImportQualifiedPost</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addError</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">msg</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/855f71a9c639a72833b63cd03061cc92785c2228...23fac6834bba3181c13250aee54a28ddbeb3bddb#897218b3e24728ae9e5b0329b949493f1ede80fb"><strong>compiler/GHC/Tc/Errors/Hole.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE CPP #-}</span></span>
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2
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE RecordWildCards #-}</span></span>
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3
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE ExistentialQuantification #-}</span></span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# OPTIONS_GHC -Wno-incomplete-record-updates #-}</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">@@ -779,7 +780,9 @@ tcFilterHoleFits limit typed_hole ht@(hole_ty, _) candidates =</td>
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779
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780
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<pre style="margin: 0;"> <span id="LC780" 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;">dataConWrapId</span> <span class="n" style="color: #333;">con</span><span class="p">,</span> <span class="n" style="color: #333;">dataConNonlinearType</span> <span class="n" style="color: #333;">con</span><span class="p">)</span></span>
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780
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781
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<pre style="margin: 0;"> <span id="LC781" 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 class="p">}</span></span>
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781
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782
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<pre style="margin: 0;"> <span id="LC782" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">hfc</span> <span class="kr" style="font-weight: 600;">of</span></span>
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783
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<pre style="margin: 0;">+<span id="LC783" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">__GLASGOW_HASKELL__</span> <span class="o" style="font-weight: 600;"><=</span> <span class="mi" style="color: #099;">810</span></span>
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782
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784
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<pre style="margin: 0;"> <span id="LC784" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">IdHFCand</span> <span class="n" style="color: #333;">id</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">idName</span> <span class="n" style="color: #333;">id</span></span>
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785
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<pre style="margin: 0;">+<span id="LC785" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="n" style="color: #333;">endif</span></span>
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783
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786
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<pre style="margin: 0;"> <span id="LC786" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">GreHFCand</span> <span class="n" style="color: #333;">gre</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">gre_name</span> <span class="n" style="color: #333;">gre</span></span>
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784
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787
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<pre style="margin: 0;"> <span id="LC787" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NameHFCand</span> <span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">name</span></span>
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788
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<pre style="margin: 0;"> <span id="LC788" class="line" lang="haskell"> <span class="n" style="color: #333;">discard_it</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">subs</span> <span class="n" style="color: #333;">seen</span> <span class="n" style="color: #333;">maxleft</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">elts</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/855f71a9c639a72833b63cd03061cc92785c2228...23fac6834bba3181c13250aee54a28ddbeb3bddb#9355bef855426caf5f526925edf351b20f9a86c4"><strong>compiler/GHC/Tc/Gen/HsType.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">@@ -1079,7 +1079,9 @@ tc_hs_type mode rn_ty@(HsTupleTy _ hs_tup_sort tys) exp_kind</td>
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1079
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<pre style="margin: 0;"> <span id="LC1079" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsUnboxedTuple</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">UnboxedTuple</span></span>
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1080
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1080
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<pre style="margin: 0;"> <span id="LC1080" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsBoxedTuple</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">BoxedTuple</span></span>
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1081
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1081
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<pre style="margin: 0;"> <span id="LC1081" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsConstraintTuple</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ConstraintTuple</span></span>
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1082
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<pre style="margin: 0;">+<span id="LC1082" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">__GLASGOW_HASKELL__</span> <span class="o" style="font-weight: 600;"><=</span> <span class="mi" style="color: #099;">810</span></span>
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1083
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<pre style="margin: 0;"> <span id="LC1083" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"tc_hs_type HsTupleTy"</span></span>
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1084
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<pre style="margin: 0;">+<span id="LC1084" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="n" style="color: #333;">endif</span></span>
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1085
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<pre style="margin: 0;"> <span id="LC1085" class="line" lang="haskell"></span>
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1086
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<pre style="margin: 0;"> <span id="LC1086" class="line" lang="haskell"><span class="n" style="color: #333;">tc_hs_type</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">rn_ty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsSumTy</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">hs_tys</span><span class="p">)</span> <span class="n" style="color: #333;">exp_kind</span></span>
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1087
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<pre style="margin: 0;"> <span id="LC1087" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="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;">arity</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">hs_tys</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/855f71a9c639a72833b63cd03061cc92785c2228...23fac6834bba3181c13250aee54a28ddbeb3bddb#cb4ad425e8ed846dfcc5d3793b08b95f6864e545"><strong>compiler/GHC/Utils/Monad.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -226,3 +226,175 @@ unlessM condM acc = do { cond <- condM</td>
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<pre style="margin: 0;"> <span id="LC226" class="line" lang="haskell"><span class="n" style="color: #333;">filterOutM</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Applicative</span> <span class="n" style="color: #333;">m</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="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</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="n" style="color: #333;">m</span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC227" class="line" lang="haskell"><span class="n" style="color: #333;">filterOutM</span> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;"> <span id="LC228" class="line" lang="haskell"> <span class="n" style="color: #333;">foldr</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">liftA2</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">flg</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">flg</span> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">id</span> <span class="kr" style="font-weight: 600;">else</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="o" style="font-weight: 600;">:</span><span class="p">))</span> <span class="p">(</span><span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">x</span><span class="p">))</span> <span class="p">(</span><span class="n" style="color: #333;">pure</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="LC229" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC230" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [The one-shot state monad trick]</span></span>
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<pre style="margin: 0;">+<span id="LC231" 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="LC232" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Summary: many places in GHC use a state monad, and we really want those</span></span>
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<pre style="margin: 0;">+<span id="LC233" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">functions to be eta-expanded (#18202).</span></span>
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234
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<pre style="margin: 0;">+<span id="LC234" class="line" lang="haskell"></span>
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235
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<pre style="margin: 0;">+<span id="LC235" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The problem</span></span>
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236
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<pre style="margin: 0;">+<span id="LC236" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~</span></span>
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237
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<pre style="margin: 0;">+<span id="LC237" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider</span></span>
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238
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<pre style="margin: 0;">+<span id="LC238" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> newtype M a = MkM (State -> (State, a))</span></span>
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239
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<pre style="margin: 0;">+<span id="LC239" class="line" lang="haskell"></span>
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240
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<pre style="margin: 0;">+<span id="LC240" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance Monad M where</span></span>
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241
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<pre style="margin: 0;">+<span id="LC241" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> mf >>= k = MkM (\s -> case mf of MkM f -></span></span>
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242
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<pre style="margin: 0;">+<span id="LC242" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> case f s of (s',r) -></span></span>
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243
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<pre style="margin: 0;">+<span id="LC243" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> case k r of MkM g -></span></span>
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244
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<pre style="margin: 0;">+<span id="LC244" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g s')</span></span>
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245
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<pre style="margin: 0;">+<span id="LC245" class="line" lang="haskell"></span>
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246
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<pre style="margin: 0;">+<span id="LC246" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> fooM :: Int -> M Int</span></span>
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247
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<pre style="margin: 0;">+<span id="LC247" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> fooM x = g y >>= \r -> h r</span></span>
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248
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<pre style="margin: 0;">+<span id="LC248" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> where</span></span>
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249
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<pre style="margin: 0;">+<span id="LC249" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> y = expensive x</span></span>
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250
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<pre style="margin: 0;">+<span id="LC250" class="line" lang="haskell"></span>
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251
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<pre style="margin: 0;">+<span id="LC251" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Now suppose you say (repeat 20 (fooM 4)), where</span></span>
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252
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<pre style="margin: 0;">+<span id="LC252" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> repeat :: Int -> M Int -> M Int</span></span>
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253
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<pre style="margin: 0;">+<span id="LC253" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">performs its argument n times. You would expect (expensive 4) to be</span></span>
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254
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<pre style="margin: 0;">+<span id="LC254" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">evaluated only once, not 20 times. So foo should have arity 1 (not 2);</span></span>
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255
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<pre style="margin: 0;">+<span id="LC255" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">it should look like this (modulo casts)</span></span>
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256
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<pre style="margin: 0;">+<span id="LC256" class="line" lang="haskell"></span>
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257
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<pre style="margin: 0;">+<span id="LC257" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> fooM x = let y = expensive x in</span></span>
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258
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<pre style="margin: 0;">+<span id="LC258" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> \s -> case g y of ...</span></span>
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259
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<pre style="margin: 0;">+<span id="LC259" class="line" lang="haskell"></span>
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260
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<pre style="margin: 0;">+<span id="LC260" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But creating and then repeating, a monadic computation is rare. If you</span></span>
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261
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<pre style="margin: 0;">+<span id="LC261" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">/aren't/ re-using (M a) value, it's /much/ more efficient to make</span></span>
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262
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<pre style="margin: 0;">+<span id="LC262" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">foo have arity 2, thus:</span></span>
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263
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<pre style="margin: 0;">+<span id="LC263" class="line" lang="haskell"></span>
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264
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<pre style="margin: 0;">+<span id="LC264" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> fooM x s = case g (expensive x) of ...</span></span>
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265
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<pre style="margin: 0;">+<span id="LC265" class="line" lang="haskell"></span>
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266
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<pre style="margin: 0;">+<span id="LC266" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Why more efficient? Because now foo takes its argument both at once,</span></span>
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267
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<pre style="margin: 0;">+<span id="LC267" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">rather than one at a time, creating a heap-allocated function closure. See</span></span>
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268
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<pre style="margin: 0;">+<span id="LC268" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">https://www.joachim-breitner.de/blog/763-Faster_Winter_5__Eta-Expanding_ReaderT</span></span>
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269
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<pre style="margin: 0;">+<span id="LC269" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">for a very good explanation of the issue which led to these optimisations</span></span>
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270
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<pre style="margin: 0;">+<span id="LC270" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">into GHC.</span></span>
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271
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<pre style="margin: 0;">+<span id="LC271" class="line" lang="haskell"></span>
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272
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<pre style="margin: 0;">+<span id="LC272" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The trick</span></span>
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273
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<pre style="margin: 0;">+<span id="LC273" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~</span></span>
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274
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<pre style="margin: 0;">+<span id="LC274" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">With state monads like M the general case is that we *aren't* reusing</span></span>
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275
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<pre style="margin: 0;">+<span id="LC275" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(M a) values so it is much more efficient to avoid allocating a</span></span>
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276
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<pre style="margin: 0;">+<span id="LC276" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">function closure for them. So the state monad trick is a way to keep</span></span>
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277
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<pre style="margin: 0;">+<span id="LC277" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the monadic syntax but to make GHC eta-expand functions like `fooM`.</span></span>
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278
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<pre style="margin: 0;">+<span id="LC278" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">To do that we use the "oneShot" magic function.</span></span>
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279
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<pre style="margin: 0;">+<span id="LC279" class="line" lang="haskell"></span>
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280
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<pre style="margin: 0;">+<span id="LC280" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here is the trick:</span></span>
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281
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<pre style="margin: 0;">+<span id="LC281" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Define a "smart constructor"</span></span>
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<pre style="margin: 0;">+<span id="LC282" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> mkM :: (State -> (State,a)) -> M a</span></span>
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283
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<pre style="margin: 0;">+<span id="LC283" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> mkM f = MkM (oneShot m)</span></span>
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284
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<pre style="margin: 0;">+<span id="LC284" class="line" lang="haskell"></span>
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285
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<pre style="margin: 0;">+<span id="LC285" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Never call MkM directly, as a constructor. Instead, always call mkM.</span></span>
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286
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<pre style="margin: 0;">+<span id="LC286" class="line" lang="haskell"></span>
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287
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<pre style="margin: 0;">+<span id="LC287" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">And that's it! The magic 'oneShot' function does this transformation:</span></span>
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288
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<pre style="margin: 0;">+<span id="LC288" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> oneShot (\s. e) ==> \s{os}. e</span></span>
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289
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<pre style="margin: 0;">+<span id="LC289" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">which pins a one-shot flag {os} onto the binder 's'. That tells GHC</span></span>
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290
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<pre style="margin: 0;">+<span id="LC290" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that it can assume the lambda is called only once, and thus can freely</span></span>
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291
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<pre style="margin: 0;">+<span id="LC291" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">float computations in and out of the lambda.</span></span>
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292
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<pre style="margin: 0;">+<span id="LC292" class="line" lang="haskell"></span>
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293
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<pre style="margin: 0;">+<span id="LC293" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">To be concrete, let's see what happens to fooM:</span></span>
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294
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<pre style="margin: 0;">+<span id="LC294" class="line" lang="haskell"></span>
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295
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<pre style="margin: 0;">+<span id="LC295" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> fooM = \x. g (expensive x) >>= \r -> h r</span></span>
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296
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<pre style="margin: 0;">+<span id="LC296" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = \x. let mf = g (expensive x)</span></span>
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297
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<pre style="margin: 0;">+<span id="LC297" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> k = \r -> h r</span></span>
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298
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<pre style="margin: 0;">+<span id="LC298" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in MkM (oneShot (\s -> case mf of MkM' f -></span></span>
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299
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<pre style="margin: 0;">+<span id="LC299" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> case f s of (s',r) -></span></span>
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<pre style="margin: 0;">+<span id="LC300" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> case k r of MkM' g -></span></span>
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301
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<pre style="margin: 0;">+<span id="LC301" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g s'))</span></span>
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<pre style="margin: 0;">+<span id="LC302" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- The MkM' are just newtype casts nt_co</span></span>
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303
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<pre style="margin: 0;">+<span id="LC303" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = \x. let mf = g (expensive x)</span></span>
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304
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<pre style="margin: 0;">+<span id="LC304" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> k = \r -> h r</span></span>
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305
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<pre style="margin: 0;">+<span id="LC305" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in (\s{os}. case (mf |> nt_co) s of (s',r) -></span></span>
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306
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<pre style="margin: 0;">+<span id="LC306" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (k r) |> nt_co s')</span></span>
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<pre style="margin: 0;">+<span id="LC307" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> |> sym nt_co</span></span>
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<pre style="margin: 0;">+<span id="LC308" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC309" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- Crucial step: float let-bindings into that \s{os}</span></span>
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<pre style="margin: 0;">+<span id="LC310" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = \x. (\s{os}. case (g (expensive x) |> nt_co) s of (s',r) -></span></span>
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<pre style="margin: 0;">+<span id="LC311" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> h r |> nt_co s')</span></span>
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<pre style="margin: 0;">+<span id="LC312" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> |> sym nt_co</span></span>
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<pre style="margin: 0;">+<span id="LC313" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC314" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and voila! fooM has arity 2.</span></span>
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<pre style="margin: 0;">+<span id="LC315" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC316" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The trick is very similar to the built-in "state hack"</span></span>
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<pre style="margin: 0;">+<span id="LC317" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(see Note [The state-transformer hack] in "GHC.Core.Opt.Arity") but is</span></span>
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<pre style="margin: 0;">+<span id="LC318" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">applicable on a monad-by-monad basis under programmer control.</span></span>
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<pre style="margin: 0;">+<span id="LC319" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC320" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Using pattern synonyms</span></span>
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<pre style="margin: 0;">+<span id="LC321" 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="LC322" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Using a smart constructor is fine, but there is no way to check that we</span></span>
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<pre style="margin: 0;">+<span id="LC323" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">have found *all* uses, especially if the uses escape a single module.</span></span>
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<pre style="margin: 0;">+<span id="LC324" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">A neat (but more sophisticated) alternative is to use pattern synonyms:</span></span>
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<pre style="margin: 0;">+<span id="LC325" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC326" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- We rename the existing constructor.</span></span>
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<pre style="margin: 0;">+<span id="LC327" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> newtype M a = MkM' (State -> (State, a))</span></span>
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<pre style="margin: 0;">+<span id="LC328" class="line" lang="haskell"></span>
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329
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<pre style="margin: 0;">+<span id="LC329" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- The pattern has the old constructor name.</span></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;"> pattern MkM f <- MkM' f</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;"> where</span></span>
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332
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<pre style="margin: 0;">+<span id="LC332" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkM f = MkM' (oneShot f)</span></span>
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333
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<pre style="margin: 0;">+<span id="LC333" class="line" lang="haskell"></span>
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334
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<pre style="margin: 0;">+<span id="LC334" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Now we can simply grep to check that there are no uses of MkM'</span></span>
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335
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<pre style="margin: 0;">+<span id="LC335" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">/anywhere/, to guarantee that we have not missed any. (Using the</span></span>
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336
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<pre style="margin: 0;">+<span id="LC336" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">smart constructor alone we still need the data constructor in</span></span>
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337
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<pre style="margin: 0;">+<span id="LC337" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">patterns.) That's the advantage of the pattern-synonym approach, but</span></span>
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338
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<pre style="margin: 0;">+<span id="LC338" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">it is more elaborate.</span></span>
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339
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<pre style="margin: 0;">+<span id="LC339" class="line" lang="haskell"></span>
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340
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<pre style="margin: 0;">+<span id="LC340" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The pattern synonym approach is due to Sebastian Graaf (#18238)</span></span>
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341
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<pre style="margin: 0;">+<span id="LC341" class="line" lang="haskell"></span>
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342
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<pre style="margin: 0;">+<span id="LC342" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Derived instances</span></span>
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343
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<pre style="margin: 0;">+<span id="LC343" 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="LC344" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">One caveat of both approaches is that derived instances don't use the smart</span></span>
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<pre style="margin: 0;">+<span id="LC345" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">constructor /or/ the pattern synonym. So they won't benefit from the automatic</span></span>
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346
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<pre style="margin: 0;">+<span id="LC346" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">insertion of "oneShot".</span></span>
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347
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<pre style="margin: 0;">+<span id="LC347" class="line" lang="haskell"></span>
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348
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<pre style="margin: 0;">+<span id="LC348" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data M a = MkM' (State -> (State,a))</span></span>
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349
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<pre style="margin: 0;">+<span id="LC349" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> deriving (Functor) <-- Functor implementation will use MkM'!</span></span>
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350
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<pre style="margin: 0;">+<span id="LC350" class="line" lang="haskell"></span>
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351
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<pre style="margin: 0;">+<span id="LC351" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Conclusion: don't use 'derviving' in these cases.</span></span>
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352
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<pre style="margin: 0;">+<span id="LC352" class="line" lang="haskell"></span>
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353
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<pre style="margin: 0;">+<span id="LC353" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Multi-shot actions (cf #18238)</span></span>
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354
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<pre style="margin: 0;">+<span id="LC354" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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355
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<pre style="margin: 0;">+<span id="LC355" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Sometimes we really *do* want computations to be shared! Remember our</span></span>
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<pre style="margin: 0;">+<span id="LC356" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">example (repeat 20 (fooM 4)). See Note [multiShotIO] in GHC.Types.Unique.Supply</span></span>
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<pre style="margin: 0;">+<span id="LC357" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC358" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We can force fooM to have arity 1 using multiShot:</span></span>
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359
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<pre style="margin: 0;">+<span id="LC359" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC360" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> fooM :: Int -> M Int</span></span>
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361
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<pre style="margin: 0;">+<span id="LC361" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> fooM x = multiShotM (g y >>= \r -> h r)</span></span>
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362
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<pre style="margin: 0;">+<span id="LC362" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> where</span></span>
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<pre style="margin: 0;">+<span id="LC363" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> y = expensive x</span></span>
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<pre style="margin: 0;">+<span id="LC364" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC365" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> multiShotM :: M a -> M a</span></span>
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366
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<pre style="margin: 0;">+<span id="LC366" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> {-# INLINE multiShotM #-}</span></span>
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<pre style="margin: 0;">+<span id="LC367" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> multiShotM (MkM m) = MkM (\s -> inline m s)</span></span>
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368
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<pre style="margin: 0;">+<span id="LC368" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- Really uses the data constructor,</span></span>
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369
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<pre style="margin: 0;">+<span id="LC369" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- not the smart constructor!</span></span>
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370
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<pre style="margin: 0;">+<span id="LC370" class="line" lang="haskell"></span>
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371
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<pre style="margin: 0;">+<span id="LC371" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Now we can see how fooM optimises (ignoring casts)</span></span>
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372
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<pre style="margin: 0;">+<span id="LC372" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC373" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> multiShotM (g y >>= \r -> h r)</span></span>
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374
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<pre style="margin: 0;">+<span id="LC374" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ==> {inline (>>=)}</span></span>
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375
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<pre style="margin: 0;">+<span id="LC375" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> multiShotM (\s{os}. case g y s of ...)</span></span>
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376
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<pre style="margin: 0;">+<span id="LC376" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ==> {inline multiShotM}</span></span>
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377
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<pre style="margin: 0;">+<span id="LC377" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> let m = \s{os}. case g y s of ...</span></span>
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378
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<pre style="margin: 0;">+<span id="LC378" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in \s. inline m s</span></span>
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379
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<pre style="margin: 0;">+<span id="LC379" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ==> {inline m}</span></span>
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<pre style="margin: 0;">+<span id="LC380" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> \s. (\s{os}. case g y s of ...) s</span></span>
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381
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<pre style="margin: 0;">+<span id="LC381" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ==> \s. case g y s of ...</span></span>
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382
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<pre style="margin: 0;">+<span id="LC382" class="line" lang="haskell"></span>
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383
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<pre style="margin: 0;">+<span id="LC383" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and voila! the one-shot flag has gone. It's possible that y has been</span></span>
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384
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<pre style="margin: 0;">+<span id="LC384" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">replaced by (expensive x), but full laziness should pull it back out.</span></span>
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385
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<pre style="margin: 0;">+<span id="LC385" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(This part seems less robust.)</span></span>
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386
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<pre style="margin: 0;">+<span id="LC386" class="line" lang="haskell"></span>
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387
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<pre style="margin: 0;">+<span id="LC387" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The magic `inline` function does two things</span></span>
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388
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<pre style="margin: 0;">+<span id="LC388" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* It prevents eta reduction. If we wrote just</span></span>
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389
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<pre style="margin: 0;">+<span id="LC389" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> multiShotIO (IO m) = IO (\s -> m s)</span></span>
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390
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<pre style="margin: 0;">+<span id="LC390" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the lamda would eta-reduce to 'm' and all would be lost.</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="cm" style="color: #998; font-style: italic;">* It helps ensure that 'm' really does inline.</span></span>
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393
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<pre style="margin: 0;">+<span id="LC393" class="line" lang="haskell"></span>
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394
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<pre style="margin: 0;">+<span id="LC394" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that 'inline' evaporates in phase 0. See Note [inlineIdMagic]</span></span>
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395
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<pre style="margin: 0;">+<span id="LC395" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in GHC.Core.Opt.ConstantFold.match_inline.</span></span>
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396
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<pre style="margin: 0;">+<span id="LC396" class="line" lang="haskell"></span>
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397
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<pre style="margin: 0;">+<span id="LC397" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The INLINE pragma on multiShotM is very important, else the</span></span>
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398
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<pre style="margin: 0;">+<span id="LC398" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'inline' call will evaporate when compiling the module that</span></span>
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399
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<pre style="margin: 0;">+<span id="LC399" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">defines 'multiShotM', before it is ever exported.</span></span>
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400
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<pre style="margin: 0;">+<span id="LC400" 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/-/compare/855f71a9c639a72833b63cd03061cc92785c2228...23fac6834bba3181c13250aee54a28ddbeb3bddb#4569c39c0942a37f3d3a5b5014fcc735d38b82e8"><strong>libraries/base/GHC/IO/Encoding/CodePage.hs</strong></a>
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1
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE BangPatterns #-}</span></span>
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1
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2
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE CPP #-}</span></span>
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3
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE MagicHash #-}</span></span>
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2
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4
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE NoImplicitPrelude #-}</span></span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE NondecreasingIndentation #-}</span></span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE Trustworthy #-}</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/855f71a9c639a72833b63cd03061cc92785c2228...23fac6834bba3181c13250aee54a28ddbeb3bddb#496bf99eec323624c4dc197d4d61221c469a1bb3"><strong>testsuite/tests/module/mod184.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext">mod184.hs:6:8: warning: [-Wprepositive-qualified-module]</span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext"> Found ‘qualified’ in prepositive position</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> Suggested fix: place ‘qualified’ after the module name instead.</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> To allow this, enable language extension 'ImportQualifiedPost'</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/855f71a9c639a72833b63cd03061cc92785c2228...23fac6834bba3181c13250aee54a28ddbeb3bddb#b28640cfb4cbe6647e0bb3a3e12ef25528acbbf7"><strong>testsuite/tests/pmcheck/should_compile/T18533.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# OPTIONS_GHC -Wincomplete-patterns -fforce-recomp #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE GADTs, DataKinds, TypeFamilies, BangPatterns #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18533</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">SBool</span> <span class="p">(</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;">Bool</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">STrue</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SBool</span> <span class="kt" style="color: #458; font-weight: 600;">'True</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SFalse</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SBool</span> <span class="kt" style="color: #458; font-weight: 600;">'False</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">Fam</span> <span class="p">(</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;">Bool</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Fam</span> <span class="kt" style="color: #458; font-weight: 600;">'True</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">T</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><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;">Fam</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;">SBool</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;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">t</span> <span class="n" style="color: #333;">s</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">s</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">STrue</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">t</span> <span class="kr" style="font-weight: 600;">of</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC18" 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="LC19" class="line" lang="haskell"></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="n" style="color: #333;">g</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</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="LC22" class="line" lang="haskell"><span class="n" style="color: #333;">g</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">x</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC23" 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;">a</span> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">x</span> <span class="kr" style="font-weight: 600;">of</span> <span class="kt" style="color: #458; font-weight: 600;">True</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="LC24" 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="kt" style="color: #458; font-weight: 600;">True</span></span></pre>
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<li id="a52966ece03f9e76a93a2c4ea96b9fb25368723d">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/855f71a9c639a72833b63cd03061cc92785c2228...23fac6834bba3181c13250aee54a28ddbeb3bddb#a52966ece03f9e76a93a2c4ea96b9fb25368723d"><strong>testsuite/tests/pmcheck/should_compile/all.T</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">@@ -122,6 +122,8 @@ test('T18049', normal, compile,</td>
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<pre style="margin: 0;"> <span id="LC122" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">-fwarn-incomplete-patterns -fwarn-overlapping-patterns</span><span class="p">'])</span></span>
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<pre style="margin: 0;"> <span id="LC123" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18478</span><span class="p">',</span> <span class="nv" style="color: #008080;">collect_compiler_stats</span><span class="p">('</span><span class="s1" style="color: #d14;">bytes allocated</span><span class="p">',</span><span class="mi" style="color: #099;">10</span><span class="p">),</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC124" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">-fwarn-incomplete-patterns -fwarn-overlapping-patterns</span><span class="p">'])</span></span>
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<pre style="margin: 0;">+<span id="LC125" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18533</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC126" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">-fwarn-incomplete-patterns -fwarn-overlapping-patterns</span><span class="p">'])</span></span>
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<pre style="margin: 0;"> <span id="LC127" class="line" lang="perl"></span>
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<pre style="margin: 0;"> <span id="LC128" class="line" lang="perl"><span class="c1" style="color: #998; font-style: italic;"># Other tests</span></span>
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<pre style="margin: 0;"> <span id="LC129" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">pmc001</span><span class="p">',</span> <span class="o" style="font-weight: 600;">[]</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
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