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<h3>
Marge Bot pushed to branch master
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/67ce72da1689058cb689ffbb6fcbd5cd12af56df">67ce72da</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-09-10T10:35:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add long-distance info for pattern bindings (#18572)
We didn't consider the RHS of a pattern-binding before, which led to
surprising warnings listed in #18572.
As can be seen from the regression test T18572, we get the expected
output now.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1207576ac0cfdd3fe1ea00b5505f7c874613451e">1207576a</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-09-10T10:35:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Big refactor using guard tree variants more closely following source syntax (#18565)
Previously, we desugared and coverage checked plain guard trees as
described in Lower Your Guards. That caused (in !3849) quite a bit of
pain when we need to partially recover tree structure of the input
syntax to return covered sets for long-distance information, for
example.
In this refactor, I introduced a guard tree variant for each relevant
source syntax component of a pattern-match (mainly match groups, match,
GRHS, empty case, pattern binding). I made sure to share as much
coverage checking code as possible, so that the syntax-specific checking
functions are just wrappers around the more substantial checking
functions for the LYG primitives (`checkSequence`, `checkGrds`).
The refactoring payed off in clearer code and elimination of all panics
related to assumed guard tree structure and thus fixes #18565.
I also took the liberty to rename and re-arrange the order of functions
and comments in the module, deleted some dead and irrelevant Notes,
wrote some new ones and gave an overview module haddock.
</pre>
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</ul>
<h4>19 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#29399f07d3320158454cb214d24b4825a7bf4928">
compiler/GHC/Data/OrdList.hs
</a>
</li>
<li class="file-stats">
<a href="#65e2067fbb7377818b6cadff0531f44029499948">
compiler/GHC/HsToCore/Binds.hs
</a>
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<li class="file-stats">
<a href="#6bdd5abc649727f2a802bc96ce5c276de19d3726">
compiler/GHC/HsToCore/Expr.hs
</a>
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<li class="file-stats">
<a href="#83f0b13548ac43fe13b1813fb407249ff9b825f7">
compiler/GHC/HsToCore/GuardedRHSs.hs
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<li class="file-stats">
<a href="#912bb8ed70a132c8eb2e037f8c9ecb045d2c229c">
compiler/GHC/HsToCore/ListComp.hs
</a>
</li>
<li class="file-stats">
<a href="#085703923f9c18f6ac9f926ac9a4c7c7e6d9d9ed">
compiler/GHC/HsToCore/Match.hs
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<li class="file-stats">
<a href="#7c474b472edbb70d6316b45cccdb0c78321e94d3">
compiler/GHC/HsToCore/Match.hs-boot
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<li class="file-stats">
<a href="#ac0a6473a902628a18b3a470122e5cc1ce09de14">
compiler/GHC/HsToCore/PmCheck.hs
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<li class="file-stats">
<a href="#8d8e5922fde8bc19ffa2bc9cae6b6720abb88564">
compiler/GHC/HsToCore/PmCheck/Oracle.hs
</a>
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<li class="file-stats">
<a href="#a90b29966ba2a86c0f6927651648cb062f00ea03">
compiler/GHC/HsToCore/PmCheck/Types.hs
</a>
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<li class="file-stats">
<a href="#7dcf5b567a6cd3c9d98cf8d57323fbca1b1536e9">
compiler/GHC/Tc/Types.hs
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<li class="file-stats">
<a href="#4d45cd1896284e4b4034580e431af68b09013b33">
compiler/GHC/Utils/Misc.hs
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<li class="file-stats">
<a href="#581c2162bdf32027e268d4f1f76fd7463a805cb0">
testsuite/tests/deSugar/should_compile/ds020.stderr
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</li>
<li class="file-stats">
<a href="#0c45984ad9bf4e57b152ed07fcb1b36bf1196441">
testsuite/tests/module/all.T
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</li>
<li class="file-stats">
<a href="#c70fb03205a3f0cb29e4ae40d190f40f06f22caf">
<span class="new-file">
+
testsuite/tests/pmcheck/should_compile/T18572.hs
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</a>
</li>
<li class="file-stats">
<a href="#ca32cb2e5ad82cf1602a04517313c35b37ffd83f">
<span class="new-file">
+
testsuite/tests/pmcheck/should_compile/T18572.stderr
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</a>
</li>
<li class="file-stats">
<a href="#a52966ece03f9e76a93a2c4ea96b9fb25368723d">
testsuite/tests/pmcheck/should_compile/all.T
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<li class="file-stats">
<a href="#5d2894916ade559bc87858aa635d1e7cc11196ee">
testsuite/tests/rename/should_compile/T7085.stderr
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<li class="file-stats">
<a href="#f829489a82696637aa2035c6dc435892f02a7652">
testsuite/tests/unboxedsums/all.T
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</li>
</ul>
<h4>Changes:</h4>
<li id="29399f07d3320158454cb214d24b4825a7bf4928">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/4798caa0fefd7adf4c5b85fa84a6f28fcc6b350b...1207576ac0cfdd3fe1ea00b5505f7c874613451e#29399f07d3320158454cb214d24b4825a7bf4928"><strong>compiler/GHC/Data/OrdList.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">@@ -5,13 +5,16 @@</td>
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<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC5" class="line" lang="haskell"></span>
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<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC6" 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="LC7" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE DeriveFunctor #-}</span></span>
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<pre style="margin: 0;">-<span id="LC8" class="line" lang="haskell"></span>
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<td class="diff-line-num old_line" data-linenumber="9" 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="LC8" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE BangPatterns #-}</span></span>
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<td class="diff-line-num new new_line" data-linenumber="9" 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="LC9" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE ViewPatterns #-}</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE PatternSynonyms #-}</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE UnboxedSums #-}</span></span>
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<td class="diff-line-num new new_line" data-linenumber="12" 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="LC12" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE UnboxedTuples #-}</span></span>
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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="cd">-- | Provide trees (of instructions), so that lists of instructions can be</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;">-- appended in linear time.</span></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.Data.OrdList</span> <span class="p">(</span></span>
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<td class="diff-line-num new_line old" data-linenumber="17" 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="LC14" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">OrdList</span><span class="p">,</span></span>
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<td class="diff-line-num new new_line" data-linenumber="17" 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="LC17" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">OrdList</span><span class="p">,</span><span class="idiff left"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">pattern</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NilOL</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">pattern</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">ConsOL</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">pattern</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">SnocOL</span></span><span class="p"><span class="idiff right">,</span></span></span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">nilOL</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isNilOL</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">unitOL</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">appOL</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">consOL</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">snocOL</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">concatOL</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lastOL</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">headOL</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mapOL</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">fromOL</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">toOL</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">foldrOL</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">foldlOL</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">reverseOL</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">fromOLReverse</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">@@ -79,6 +82,50 @@ snocOL as b = Snoc as b</td>
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<pre style="margin: 0;"> <span id="LC82" class="line" lang="haskell"><span class="n" style="color: #333;">consOL</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">bs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Cons</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">bs</span></span>
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80
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83
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<pre style="margin: 0;"> <span id="LC83" class="line" lang="haskell"><span class="n" style="color: #333;">concatOL</span> <span class="n" style="color: #333;">aas</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="n" style="color: #333;">appOL</span> <span class="kt" style="color: #458; font-weight: 600;">None</span> <span class="n" style="color: #333;">aas</span></span>
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81
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84
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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="n" style="color: #333;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">NilOL</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">OrdList</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC86" class="line" lang="haskell"><span class="n" style="color: #333;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">NilOL</span> <span class="o" style="font-weight: 600;"><-</span> <span class="p">(</span><span class="n" style="color: #333;">isNilOL</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">True</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="LC87" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NilOL</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">None</span></span>
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<pre style="margin: 0;">+<span id="LC88" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC89" class="line" lang="haskell"><span class="cd">-- | An unboxed 'Maybe' type with two unboxed fields in the 'Just' case.</span></span>
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<pre style="margin: 0;">+<span id="LC90" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Useful for defining 'viewCons' and 'viewSnoc' without overhead.</span></span>
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<pre style="margin: 0;">+<span id="LC91" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">VMaybe</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="o" style="font-weight: 600;">#</span> <span class="p">(</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">#</span><span class="p">)</span> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="o" style="font-weight: 600;">#</span> <span class="o" style="font-weight: 600;">#</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="LC92" class="line" lang="haskell"><span class="n" style="color: #333;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">VJust</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VMaybe</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span></span>
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<pre style="margin: 0;">+<span id="LC93" class="line" lang="haskell"><span class="n" style="color: #333;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">VJust</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="o" style="font-weight: 600;">#</span> <span class="p">(</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">#</span><span class="p">)</span> <span class="o" style="font-weight: 600;">|</span> <span class="o" style="font-weight: 600;">#</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC94" class="line" lang="haskell"><span class="n" style="color: #333;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">VNothing</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">VMaybe</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span></span>
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<pre style="margin: 0;">+<span id="LC95" class="line" lang="haskell"><span class="n" style="color: #333;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">VNothing</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="o" style="font-weight: 600;">#</span> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="o" style="font-weight: 600;">#</span> <span class="o" style="font-weight: 600;">#</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="LC96" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# COMPLETE VJust, VNothing #-}</span></span>
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<pre style="margin: 0;">+<span id="LC97" class="line" lang="haskell"></span>
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98
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<pre style="margin: 0;">+<span id="LC98" class="line" lang="haskell"><span class="n" style="color: #333;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">ConsOL</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">OrdList</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;">OrdList</span> <span class="n" style="color: #333;">a</span></span>
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99
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<pre style="margin: 0;">+<span id="LC99" class="line" lang="haskell"><span class="n" style="color: #333;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">ConsOL</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">xs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="p">(</span><span class="n" style="color: #333;">viewCons</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VJust</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">xs</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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100
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<pre style="margin: 0;">+<span id="LC100" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ConsOL</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">xs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">consOL</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">xs</span></span>
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101
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<pre style="margin: 0;">+<span id="LC101" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# COMPLETE NilOL, ConsOL #-}</span></span>
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102
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<pre style="margin: 0;">+<span id="LC102" class="line" lang="haskell"><span class="n" style="color: #333;">viewCons</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">OrdList</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;">VMaybe</span> <span class="n" style="color: #333;">a</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">OrdList</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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103
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<pre style="margin: 0;">+<span id="LC103" class="line" lang="haskell"><span class="n" style="color: #333;">viewCons</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">One</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;">VJust</span> <span class="n" style="color: #333;">a</span> <span class="kt" style="color: #458; font-weight: 600;">NilOL</span></span>
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104
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<pre style="margin: 0;">+<span id="LC104" class="line" lang="haskell"><span class="n" style="color: #333;">viewCons</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Cons</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">as</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">VJust</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">as</span></span>
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105
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<pre style="margin: 0;">+<span id="LC105" class="line" lang="haskell"><span class="n" style="color: #333;">viewCons</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Snoc</span> <span class="n" style="color: #333;">as</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">viewCons</span> <span class="n" style="color: #333;">as</span> <span class="kr" style="font-weight: 600;">of</span></span>
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106
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<pre style="margin: 0;">+<span id="LC106" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">VJust</span> <span class="n" style="color: #333;">a'</span> <span class="n" style="color: #333;">as'</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VJust</span> <span class="n" style="color: #333;">a'</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Snoc</span> <span class="n" style="color: #333;">as'</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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107
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<pre style="margin: 0;">+<span id="LC107" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">VNothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VJust</span> <span class="n" style="color: #333;">a</span> <span class="kt" style="color: #458; font-weight: 600;">NilOL</span></span>
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108
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<pre style="margin: 0;">+<span id="LC108" class="line" lang="haskell"><span class="n" style="color: #333;">viewCons</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Two</span> <span class="n" style="color: #333;">as1</span> <span class="n" style="color: #333;">as2</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;">viewCons</span> <span class="n" style="color: #333;">as1</span> <span class="kr" style="font-weight: 600;">of</span></span>
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109
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<pre style="margin: 0;">+<span id="LC109" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">VJust</span> <span class="n" style="color: #333;">a'</span> <span class="n" style="color: #333;">as1'</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VJust</span> <span class="n" style="color: #333;">a'</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Two</span> <span class="n" style="color: #333;">as1'</span> <span class="n" style="color: #333;">as2</span><span class="p">)</span></span>
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110
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<pre style="margin: 0;">+<span id="LC110" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">VNothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">viewCons</span> <span class="n" style="color: #333;">as2</span></span>
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111
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<pre style="margin: 0;">+<span id="LC111" class="line" lang="haskell"><span class="n" style="color: #333;">viewCons</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;">VNothing</span></span>
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112
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<pre style="margin: 0;">+<span id="LC112" class="line" lang="haskell"></span>
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113
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<pre style="margin: 0;">+<span id="LC113" class="line" lang="haskell"><span class="n" style="color: #333;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">SnocOL</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">OrdList</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">OrdList</span> <span class="n" style="color: #333;">a</span></span>
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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">
114
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<pre style="margin: 0;">+<span id="LC114" class="line" lang="haskell"><span class="n" style="color: #333;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">SnocOL</span> <span class="n" style="color: #333;">xs</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;"><-</span> <span class="p">(</span><span class="n" style="color: #333;">viewSnoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VJust</span> <span class="n" style="color: #333;">xs</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<td class="diff-line-num new new_line" data-linenumber="115" 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">
115
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<pre style="margin: 0;">+<span id="LC115" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SnocOL</span> <span class="n" style="color: #333;">xs</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">snocOL</span> <span class="n" style="color: #333;">xs</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">+<span id="LC116" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# COMPLETE NilOL, SnocOL #-}</span></span>
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<pre style="margin: 0;">+<span id="LC117" class="line" lang="haskell"><span class="n" style="color: #333;">viewSnoc</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">OrdList</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;">VMaybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">OrdList</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="n" style="color: #333;">a</span></span>
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118
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<pre style="margin: 0;">+<span id="LC118" class="line" lang="haskell"><span class="n" style="color: #333;">viewSnoc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">One</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;">VJust</span> <span class="kt" style="color: #458; font-weight: 600;">NilOL</span> <span class="n" style="color: #333;">a</span></span>
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119
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<pre style="margin: 0;">+<span id="LC119" class="line" lang="haskell"><span class="n" style="color: #333;">viewSnoc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Many</span> <span class="p">(</span><span class="n" style="color: #333;">reverse</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">as</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">VJust</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Many</span> <span class="p">(</span><span class="n" style="color: #333;">reverse</span> <span class="n" style="color: #333;">as</span><span class="p">))</span> <span class="n" style="color: #333;">a</span></span>
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120
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<pre style="margin: 0;">+<span id="LC120" class="line" lang="haskell"><span class="n" style="color: #333;">viewSnoc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Snoc</span> <span class="n" style="color: #333;">as</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;">VJust</span> <span class="n" style="color: #333;">as</span> <span class="n" style="color: #333;">a</span></span>
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121
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<pre style="margin: 0;">+<span id="LC121" class="line" lang="haskell"><span class="n" style="color: #333;">viewSnoc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Cons</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">as</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;">viewSnoc</span> <span class="n" style="color: #333;">as</span> <span class="kr" style="font-weight: 600;">of</span></span>
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122
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<pre style="margin: 0;">+<span id="LC122" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">VJust</span> <span class="n" style="color: #333;">as'</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;">VJust</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Cons</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">as'</span><span class="p">)</span> <span class="n" style="color: #333;">a'</span></span>
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123
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<pre style="margin: 0;">+<span id="LC123" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">VNothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VJust</span> <span class="kt" style="color: #458; font-weight: 600;">NilOL</span> <span class="n" style="color: #333;">a</span></span>
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124
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<pre style="margin: 0;">+<span id="LC124" class="line" lang="haskell"><span class="n" style="color: #333;">viewSnoc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Two</span> <span class="n" style="color: #333;">as1</span> <span class="n" style="color: #333;">as2</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;">viewSnoc</span> <span class="n" style="color: #333;">as2</span> <span class="kr" style="font-weight: 600;">of</span></span>
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125
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<pre style="margin: 0;">+<span id="LC125" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">VJust</span> <span class="n" style="color: #333;">as2'</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;">VJust</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Two</span> <span class="n" style="color: #333;">as1</span> <span class="n" style="color: #333;">as2'</span><span class="p">)</span> <span class="n" style="color: #333;">a'</span></span>
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<pre style="margin: 0;">+<span id="LC126" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">VNothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">viewSnoc</span> <span class="n" style="color: #333;">as1</span></span>
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<pre style="margin: 0;">+<span id="LC127" class="line" lang="haskell"><span class="n" style="color: #333;">viewSnoc</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;">VNothing</span></span>
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<pre style="margin: 0;">+<span id="LC128" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC129" class="line" lang="haskell"><span class="n" style="color: #333;">headOL</span> <span class="kt" style="color: #458; font-weight: 600;">None</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"headOL"</span></span>
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130
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<pre style="margin: 0;"> <span id="LC130" class="line" lang="haskell"><span class="n" style="color: #333;">headOL</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">One</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;">a</span></span>
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131
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<pre style="margin: 0;"> <span id="LC131" class="line" lang="haskell"><span class="n" style="color: #333;">headOL</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Many</span> <span class="n" style="color: #333;">as</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">head</span> <span class="n" style="color: #333;">as</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="189" 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="236" 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">@@ -189,5 +236,3 @@ strictlyOrdOL (Two a1 a2) (Two b1 b2) =</td>
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189
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<pre style="margin: 0;"> <span id="LC236" class="line" lang="haskell"><span class="n" style="color: #333;">strictlyOrdOL</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Two</span> <span class="kr" 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="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">LT</span></span>
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190
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<pre style="margin: 0;"> <span id="LC237" class="line" lang="haskell"><span class="n" style="color: #333;">strictlyOrdOL</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Many</span> <span class="n" style="color: #333;">as</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Many</span> <span class="n" style="color: #333;">bs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">compare</span> <span class="n" style="color: #333;">as</span> <span class="n" style="color: #333;">bs</span></span>
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<pre style="margin: 0;"> <span id="LC238" class="line" lang="haskell"><span class="n" style="color: #333;">strictlyOrdOL</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Many</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">GT</span></span></pre>
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<pre style="margin: 0;">-<span id="LC192" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC193" class="line" lang="haskell"></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/4798caa0fefd7adf4c5b85fa84a6f28fcc6b350b...1207576ac0cfdd3fe1ea00b5505f7c874613451e#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;">addTyCs<span class="idiff left">Ds</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">c</span>heckGRHSs</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;">addTyCs</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">covC</span>heckGRHSs</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"></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.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">@@ -152,14 +152,14 @@ dsHsBind dflags b@(FunBind { fun_id = L loc fun</td>
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<pre style="margin: 0;"> <span id="LC152" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fun_matches</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">matches</span></span>
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<pre style="margin: 0;"> <span id="LC153" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fun_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">co_fn</span></span>
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<pre style="margin: 0;"> <span id="LC154" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fun_tick</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tick</span> <span class="p">})</span></span>
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<pre style="margin: 0;">-<span id="LC155" 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;">args</span><span class="p">,</span> <span class="n" style="color: #333;">body</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addTyCs<span class="idiff left right">Ds</span></span> <span class="kt" style="color: #458; font-weight: 600;">FromSource</span> <span class="p">(</span><span class="n" style="color: #333;">hsWrapDictBinders</span> <span class="n" style="color: #333;">co_fn</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC155" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">args</span><span class="p">,</span> <span class="n" style="color: #333;">body</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addTyCs</span> <span class="kt" style="color: #458; font-weight: 600;">FromSource</span> <span class="p">(</span><span class="n" style="color: #333;">hsWrapDictBinders</span> <span class="n" style="color: #333;">co_fn</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</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;">-- FromSource might not be accurate (we don't have any</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;">-- origin annotations for things in this module), but at</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;">-- worst we do superfluous calls to the pattern match</span></span>
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159
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<pre style="margin: 0;"> <span id="LC159" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- oracle.</span></span>
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<pre style="margin: 0;">-<span id="LC160" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- addTyCs<span class="idiff left right">Ds</span>: Add type evidence to the refinement type</span></span>
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<pre style="margin: 0;">+<span id="LC160" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- addTyCs: Add type evidence to the refinement type</span></span>
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161
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161
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<pre style="margin: 0;"> <span id="LC161" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- predicate of the coverage checker</span></span>
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162
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<pre style="margin: 0;">-<span id="LC162" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">Type and Term Equality Propag</span>ation] in "GHC.HsToCore.PmCheck"</span></span>
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162
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<pre style="margin: 0;">+<span id="LC162" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">Long-distance inform</span>ation] in "GHC.HsToCore.PmCheck"</span></span>
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163
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<pre style="margin: 0;"> <span id="LC163" class="line" lang="haskell"> <span class="n" style="color: #333;">matchWrapper</span></span>
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164
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<pre style="margin: 0;"> <span id="LC164" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mkPrefixFunRhs</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="n" style="color: #333;">idName</span> <span class="n" style="color: #333;">fun</span><span class="p">)))</span></span>
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165
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<pre style="margin: 0;"> <span id="LC165" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="n" style="color: #333;">matches</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="185" 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="185" 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">@@ -185,7 +185,7 @@ 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="LC185" 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="LC186" 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="n" style="color: #333;">ty</span></span>
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187
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<pre style="margin: 0;"> <span id="LC187" 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;">checkGRHSs</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="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;">c<span class="idiff left right">ovC</span>heckGRHSs</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="n" style="color: #333;">rhss_deltas</span></span>
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190
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<pre style="margin: 0;"> <span id="LC190" 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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191
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<pre style="margin: 0;"> <span id="LC191" 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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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="201" 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="201" 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">@@ -201,11 +201,11 @@ dsHsBind dflags (AbsBinds { abs_tvs = tyvars, abs_ev_vars = dicts</td>
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201
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<pre style="margin: 0;"> <span id="LC201" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">abs_exports</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">exports</span></span>
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202
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<pre style="margin: 0;"> <span id="LC202" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">abs_ev_binds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ev_binds</span></span>
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<pre style="margin: 0;"> <span id="LC203" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">abs_binds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">binds</span><span class="p">,</span> <span class="n" style="color: #333;">abs_sig</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">has_sig</span> <span class="p">})</span></span>
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<pre style="margin: 0;">-<span id="LC204" 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;">ds_binds</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addTyCs<span class="idiff left right">Ds</span></span> <span class="kt" style="color: #458; font-weight: 600;">FromSource</span> <span class="p">(</span><span class="n" style="color: #333;">listToBag</span> <span class="n" style="color: #333;">dicts</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC204" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">ds_binds</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addTyCs</span> <span class="kt" style="color: #458; font-weight: 600;">FromSource</span> <span class="p">(</span><span class="n" style="color: #333;">listToBag</span> <span class="n" style="color: #333;">dicts</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC205" class="line" lang="haskell"> <span class="n" style="color: #333;">dsLHsBinds</span> <span class="n" style="color: #333;">binds</span></span>
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<pre style="margin: 0;">-<span id="LC206" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- addTyCs<span class="idiff left right">Ds</span>: push type constraints deeper</span></span>
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<pre style="margin: 0;">+<span id="LC206" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- addTyCs: push type constraints deeper</span></span>
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<pre style="margin: 0;"> <span id="LC207" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- for inner pattern match check</span></span>
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<pre style="margin: 0;">-<span id="LC208" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Check, Note [<span class="idiff left right">Type and Term Equality Propag</span>ation]</span></span>
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<pre style="margin: 0;">+<span id="LC208" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Check, Note [<span class="idiff left right">Long-distance inform</span>ation]</span></span>
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<pre style="margin: 0;"> <span id="LC209" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC210" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">ds_ev_binds</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsTcEvBinds_s</span> <span class="n" style="color: #333;">ev_binds</span></span>
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<pre style="margin: 0;"> <span id="LC211" class="line" lang="haskell"></span>
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<li id="6bdd5abc649727f2a802bc96ce5c276de19d3726">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/4798caa0fefd7adf4c5b85fa84a6f28fcc6b350b...1207576ac0cfdd3fe1ea00b5505f7c874613451e#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;">addTyCs<span class="idiff left">Ds</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">c</span>heckGRHSs</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;">addTyCs</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">covC</span>heckGRHSs</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">@@ -215,7 +215,7 @@ 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="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="LC218" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">match_deltas</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkGRHSs</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="LC218" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">match_deltas</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">c<span class="idiff left right">ovC</span>heckGRHSs</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="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;">match_deltas</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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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="283" 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">@@ -283,7 +283,7 @@ dsExpr hswrap@(XExpr (WrapExpr (HsWrap co_fn e)))</td>
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<pre style="margin: 0;"> <span id="LC283" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsConLikeOut</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">dc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">varToCoreExpr</span> <span class="p">(</span><span class="n" style="color: #333;">dataConWrapId</span> <span class="n" style="color: #333;">dc</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC284" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">XExpr</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="kr" style="font-weight: 600;">_</span><span class="p">))</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"dsExpr: HsWrap inside HsWrap"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">hswrap</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC285" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsPar</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;">pprPanic</span> <span class="s" style="color: #d14;">"dsExpr: HsPar inside HsWrap"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">hswrap</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC286" 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;">addTyCs<span class="idiff left right">Ds</span></span> <span class="kt" style="color: #458; font-weight: 600;">FromSource</span> <span class="p">(</span><span class="n" style="color: #333;">hsWrapDictBinders</span> <span class="n" style="color: #333;">co_fn</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC286" 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;">addTyCs</span> <span class="kt" style="color: #458; font-weight: 600;">FromSource</span> <span class="p">(</span><span class="n" style="color: #333;">hsWrapDictBinders</span> <span class="n" style="color: #333;">co_fn</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC287" class="line" lang="haskell"> <span class="n" style="color: #333;">dsExpr</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;"> <span id="LC288" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Detecting forced eta expansion]</span></span>
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<pre style="margin: 0;"> <span id="LC289" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">wrap'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsHsWrapper</span> <span class="n" style="color: #333;">co_fn</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">@@ -486,7 +486,7 @@ 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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<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;">checkGRHSs</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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489
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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;">c<span class="idiff left right">ovC</span>heckGRHSs</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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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;">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;">rhss_deltas</span></span>
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491
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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;">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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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="981" 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">@@ -981,7 +981,7 @@ dsDo ctx stmts</td>
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981
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981
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<pre style="margin: 0;"> <span id="LC981" 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;">body</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">goL</span> <span class="n" style="color: #333;">stmts</span></span>
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982
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982
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<pre style="margin: 0;"> <span id="LC982" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rhs'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsLExpr</span> <span class="n" style="color: #333;">rhs</span></span>
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983
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983
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<pre style="margin: 0;"> <span id="LC983" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">var</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">selectSimpleMatchVarL</span> <span class="p">(</span><span class="n" style="color: #333;">xbstc_boundResultMult</span> <span class="n" style="color: #333;">xbs</span><span class="p">)</span> <span class="n" style="color: #333;">pat</span></span>
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984
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<pre style="margin: 0;">-<span id="LC984" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">match</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchSinglePatVar</span> <span class="n" style="color: #333;">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>
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984
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<pre style="margin: 0;">+<span id="LC984" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">match</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchSinglePatVar</span> <span class="n" style="color: #333;">var</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Nothing</span></span><span class="idiff right"> </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>
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985
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985
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<pre style="margin: 0;"> <span id="LC985" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">xbstc_boundResultType</span> <span class="n" style="color: #333;">xbs</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">cantFailMatchResult</span> <span class="n" style="color: #333;">body</span><span class="p">)</span></span>
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986
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986
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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;">match_code</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsHandleMonadicFailure</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">match</span> <span class="p">(</span><span class="n" style="color: #333;">xbstc_failOp</span> <span class="n" style="color: #333;">xbs</span><span class="p">)</span></span>
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987
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987
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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;">dsSyntaxExpr</span> <span class="p">(</span><span class="n" style="color: #333;">xbstc_bindOp</span> <span class="n" style="color: #333;">xbs</span><span class="p">)</span> <span class="p">[</span><span class="n" style="color: #333;">rhs'</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Lam</span> <span class="n" style="color: #333;">var</span> <span class="n" style="color: #333;">match_code</span><span class="p">]</span> <span class="p">}</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1002" 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">@@ -1002,7 +1002,7 @@ dsDo ctx stmts</td>
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1002
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1002
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<pre style="margin: 0;"> <span id="LC1002" class="line" lang="haskell"></span>
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1003
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1003
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<pre style="margin: 0;"> <span id="LC1003" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">match_args</span> <span class="p">(</span><span class="n" style="color: #333;">pat</span><span class="p">,</span> <span class="n" style="color: #333;">fail_op</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">vs</span><span class="p">,</span><span class="n" style="color: #333;">body</span><span class="p">)</span></span>
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1004
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1004
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<pre style="margin: 0;"> <span id="LC1004" 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;">var</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">selectSimpleMatchVarL</span> <span class="kt" style="color: #458; font-weight: 600;">Many</span> <span class="n" style="color: #333;">pat</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1005" 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">
1005
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<pre style="margin: 0;">-<span id="LC1005" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">match</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchSinglePatVar</span> <span class="n" style="color: #333;">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>
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<pre style="margin: 0;">+<span id="LC1005" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">match</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchSinglePatVar</span> <span class="n" style="color: #333;">var</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Nothing</span></span><span class="idiff right"> </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>
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<pre style="margin: 0;"> <span id="LC1006" class="line" lang="haskell"> <span class="n" style="color: #333;">body_ty</span> <span class="p">(</span><span class="n" style="color: #333;">cantFailMatchResult</span> <span class="n" style="color: #333;">body</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1007" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">match_code</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsHandleMonadicFailure</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">match</span> <span class="n" style="color: #333;">fail_op</span></span>
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1008
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1008
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<pre style="margin: 0;"> <span id="LC1008" 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;">var</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">vs</span><span class="p">,</span> <span class="n" style="color: #333;">match_code</span><span class="p">)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/4798caa0fefd7adf4c5b85fa84a6f28fcc6b350b...1207576ac0cfdd3fe1ea00b5505f7c874613451e#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">@@ -36,7 +36,7 @@ import Control.Monad ( zipWithM )</td>
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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;">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="nf" style="color: #900; font-weight: 600;">toList</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC38" 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="LC39" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">@dsGuarded@ is used for <span class="idiff left right">pattern binding</span>s.</span></span>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">@dsGuarded@ is used for <span class="idiff left right">GRHS</span>s.</span></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">It desugars:</span></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">\begin{verbatim}</span></span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | g1 -> e1</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">@@ -44,7 +44,7 @@ It desugars:</td>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | gn -> en</span></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> where binds</span></span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">\end{verbatim}</span></span>
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<pre style="margin: 0;">-<span id="LC47" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">producing an expression with a runtime error in the corner if</span></span>
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<pre style="margin: 0;">+<span id="LC47" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">producing an expression with a runtime error in the corner <span class="idiff left right">case </span>if</span></span>
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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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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -137,8 +137,8 @@ matchGuards (BindStmt _ pat bind_rhs : stmts) ctx deltas rhs rhs_ty = do</td>
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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="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;">deltas</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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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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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;"><span class="idiff left">StmtCtxt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ctx</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pat</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="LC141" class="line" lang="haskell"> <span class="n" style="color: #333;">match_result</span></span>
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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;"><span class="idiff left">Just</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">core_rhs</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">StmtCtxt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ctx</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC141" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">pat</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rhs_ty</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">match_result</span></span>
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142
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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;">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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143
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<pre style="margin: 0;"> <span id="LC143" class="line" lang="haskell"></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> <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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<li id="912bb8ed70a132c8eb2e037f8c9ecb045d2c229c">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/4798caa0fefd7adf4c5b85fa84a6f28fcc6b350b...1207576ac0cfdd3fe1ea00b5505f7c874613451e#912bb8ed70a132c8eb2e037f8c9ecb045d2c229c"><strong>compiler/GHC/HsToCore/ListComp.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">@@ -617,7 +617,7 @@ dsMcBindStmt :: LPat GhcTc</td>
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617
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<pre style="margin: 0;"> <span id="LC617" class="line" lang="haskell"><span class="n" style="color: #333;">dsMcBindStmt</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">rhs'</span> <span class="n" style="color: #333;">bind_op</span> <span class="n" style="color: #333;">fail_op</span> <span class="n" style="color: #333;">res1_ty</span> <span class="n" style="color: #333;">stmts</span></span>
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618
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618
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<pre style="margin: 0;"> <span id="LC618" 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;">body</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsMcStmts</span> <span class="n" style="color: #333;">stmts</span></span>
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619
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619
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<pre style="margin: 0;"> <span id="LC619" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">var</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">selectSimpleMatchVarL</span> <span class="kt" style="color: #458; font-weight: 600;">Many</span> <span class="n" style="color: #333;">pat</span></span>
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620
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<pre style="margin: 0;">-<span id="LC620" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">match</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchSinglePatVar</span> <span class="n" style="color: #333;">var</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StmtCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DoExpr</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">))</span> <span class="n" style="color: #333;">pat</span></span>
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620
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<pre style="margin: 0;">+<span id="LC620" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">match</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchSinglePatVar</span> <span class="n" style="color: #333;">var</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Nothing</span></span><span class="idiff right"> </span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StmtCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DoExpr</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">))</span> <span class="n" style="color: #333;">pat</span></span>
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621
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621
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<pre style="margin: 0;"> <span id="LC621" class="line" lang="haskell"> <span class="n" style="color: #333;">res1_ty</span> <span class="p">(</span><span class="n" style="color: #333;">cantFailMatchResult</span> <span class="n" style="color: #333;">body</span><span class="p">)</span></span>
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622
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622
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<pre style="margin: 0;"> <span id="LC622" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">match_code</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsHandleMonadicFailure</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MonadComp</span> <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="p">)</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">match</span> <span class="n" style="color: #333;">fail_op</span></span>
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623
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<pre style="margin: 0;"> <span id="LC623" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">dsSyntaxExpr</span> <span class="n" style="color: #333;">bind_op</span> <span class="p">[</span><span class="n" style="color: #333;">rhs'</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Lam</span> <span class="n" style="color: #333;">var</span> <span class="n" style="color: #333;">match_code</span><span class="p">]</span> <span class="p">}</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/4798caa0fefd7adf4c5b85fa84a6f28fcc6b350b...1207576ac0cfdd3fe1ea00b5505f7c874613451e#085703923f9c18f6ac9f926ac9a4c7c7e6d9d9ed"><strong>compiler/GHC/HsToCore/Match.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">@@ -66,7 +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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<pre style="margin: 0;"> <span id="LC68" class="line" lang="haskell"></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 class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">zipWithM</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">unless</span></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="idiff left"> </span><span class="p"><span class="idiff">(</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">zipWithM</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">unless</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">when</span></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">@@ -769,9 +769,9 @@ matchWrapper ctxt mb_scr (MG { mg_alts = L _ matches</td>
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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="LC771" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">matches_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="LC773" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">Type and Term Equality Propag</span>ation]</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="LC772" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">add<span class="idiff left right">Hs</span>ScrutTmCs</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="LC773" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">Long-distance inform</span>ation]</span></span>
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<pre style="margin: 0;">+<span id="LC774" class="line" lang="haskell"> <span class="n" style="color: #333;">c<span class="idiff left right">ovC</span>heckMatches</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;">zipWithM</span> <span class="n" style="color: #333;">mk_eqn_info</span> <span class="n" style="color: #333;">matches</span> <span class="n" style="color: #333;">matches_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">@@ -820,25 +820,24 @@ matchEquations ctxt vars eqns_info rhs_ty</td>
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<pre style="margin: 0;"> <span id="LC820" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">fail_expr</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkErrorAppDs</span> <span class="n" style="color: #333;">pAT_ERROR_ID</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="n" style="color: #333;">error_doc</span></span>
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<pre style="margin: 0;"> <span id="LC821" 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;">fail_expr</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC822" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC823" 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="LC824" 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="LC825" 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="LC826" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">\subsection[matchSimply]{@matchSimply@: match a single expression against a single pattern}</span></span>
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<pre style="margin: 0;">-<span id="LC827" 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="LC828" 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="LC829" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC830" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">@mkSimpleMatch@ is a wrapper for @match@ which deals with the</span></span>
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<pre style="margin: 0;">-<span id="LC831" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">situation where we want to match a single expression against a single</span></span>
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<pre style="margin: 0;">-<span id="LC832" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">pattern. It returns an expression.</span></span>
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<pre style="margin: 0;">-<span id="LC833" 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="LC834" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC823" class="line" lang="haskell"><span class="cd">-- | @matchSimply@ is a wrapper for 'match' which deals with the</span></span>
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<pre style="margin: 0;">+<span id="LC824" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- situation where we want to match a single expression against a single</span></span>
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<pre style="margin: 0;">+<span id="LC825" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- pattern. It returns an expression.</span></span>
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<pre style="margin: 0;"> <span id="LC826" class="line" lang="haskell"><span class="n" style="color: #333;">matchSimply</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Scrutinee</span></span>
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<pre style="margin: 0;"> <span id="LC827" 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 kind</span></span>
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<pre style="margin: 0;"> <span id="LC828" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LPat</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Pattern it should match</span></span>
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<pre style="margin: 0;"> <span id="LC829" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Return this if it matches</span></span>
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<pre style="margin: 0;"> <span id="LC830" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Return this if it doesn't</span></span>
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<pre style="margin: 0;"> <span id="LC831" 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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<pre style="margin: 0;">-<span id="LC841" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Do not warn about incomplete patterns; see matchSinglePat comments</span></span>
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<pre style="margin: 0;">+<span id="LC832" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Some reasons 'matchSimply' is not defined using 'matchWrapper' (#18572):</span></span>
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<pre style="margin: 0;">+<span id="LC833" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Some call sites like in 'deBindComp' specify a @fail_expr@ that isn't a</span></span>
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<pre style="margin: 0;">+<span id="LC834" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- straight @patError@</span></span>
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<pre style="margin: 0;">+<span id="LC835" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * It receives an already desugared 'CoreExpr' for the scrutinee, not an</span></span>
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<pre style="margin: 0;">+<span id="LC836" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'HsExpr' like 'matchWrapper' expects</span></span>
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<pre style="margin: 0;">+<span id="LC837" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Filling in all the phony fields for the 'MatchGroup' for a single pattern</span></span>
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<pre style="margin: 0;">+<span id="LC838" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- match is awkward</span></span>
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<pre style="margin: 0;">+<span id="LC839" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * And we still export 'matchSinglePatVar', so not much is gained if we</span></span>
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<pre style="margin: 0;">+<span id="LC840" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- don't also implement it in terms of 'matchWrapper'</span></span>
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<pre style="margin: 0;"> <span id="LC841" class="line" lang="haskell"><span class="n" style="color: #333;">matchSimply</span> <span class="n" style="color: #333;">scrut</span> <span class="n" style="color: #333;">hs_ctx</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">result_expr</span> <span class="n" style="color: #333;">fail_expr</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="LC842" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span></span>
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<pre style="margin: 0;"> <span id="LC843" 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;">cantFailMatchResult</span> <span class="n" style="color: #333;">result_expr</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -858,7 +857,7 @@ matchSinglePat :: CoreExpr -> HsMatchContext GhcRn -> LPat GhcTc</td>
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<pre style="margin: 0;"> <span id="LC857" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC858" class="line" lang="haskell"><span class="n" style="color: #333;">matchSinglePat</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">var</span><span class="p">)</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">match_result</span></span>
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860
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<pre style="margin: 0;"> <span id="LC859" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isExternalName</span> <span class="p">(</span><span class="n" style="color: #333;">idName</span> <span class="n" style="color: #333;">var</span><span class="p">))</span></span>
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861
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<pre style="margin: 0;">-<span id="LC861" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">matchSinglePatVar</span> <span class="n" style="color: #333;">var</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">match_result</span></span>
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<pre style="margin: 0;">+<span id="LC860" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">matchSinglePatVar</span> <span class="n" style="color: #333;">var</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Nothing</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">match_result</span></span>
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<pre style="margin: 0;"> <span id="LC861" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC862" class="line" lang="haskell"><span class="n" style="color: #333;">matchSinglePat</span> <span class="n" style="color: #333;">scrut</span> <span class="n" style="color: #333;">hs_ctx</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">match_result</span></span>
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<pre style="margin: 0;"> <span id="LC863" 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;">var</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">selectSimpleMatchVarL</span> <span class="kt" style="color: #458; font-weight: 600;">Many</span> <span class="n" style="color: #333;">pat</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">@@ -867,22 +866,22 @@ matchSinglePat scrut hs_ctx pat ty match_result</td>
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<pre style="margin: 0;"> <span id="LC866" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- and to create field selectors. All of which only</span></span>
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<pre style="margin: 0;"> <span id="LC867" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- bind unrestricted variables, hence the 'Many'</span></span>
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<pre style="margin: 0;"> <span id="LC868" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- above.</span></span>
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<pre style="margin: 0;">-<span id="LC870" 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;">matchSinglePatVar</span> <span class="n" style="color: #333;">var</span> <span class="n" style="color: #333;">hs_ctx</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">match_result</span></span>
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<pre style="margin: 0;">+<span id="LC869" 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;">matchSinglePatVar</span> <span class="n" style="color: #333;">var</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Just</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">scrut</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">hs_ctx</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">match_result</span></span>
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<pre style="margin: 0;"> <span id="LC870" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">bindNonRec</span> <span class="n" style="color: #333;">var</span> <span class="n" style="color: #333;">scrut</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">match_result'</span></span>
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<pre style="margin: 0;"> <span id="LC871" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC872" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC873" class="line" lang="haskell"><span class="n" style="color: #333;">matchSinglePatVar</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Match Ids]</span></span>
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<pre style="margin: 0;">+<span id="LC874" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ The scrutinee the match id is bound to</span></span>
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<pre style="margin: 0;"> <span id="LC875" 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="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LPat</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span></span>
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<pre style="margin: 0;"> <span id="LC876" 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="o" style="font-weight: 600;">-></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="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="LC877" class="line" lang="haskell"><span class="n" style="color: #333;">matchSinglePatVar</span> <span class="n" style="color: #333;">var</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">match_result</span></span>
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<pre style="margin: 0;">+<span id="LC877" class="line" lang="haskell"><span class="n" style="color: #333;">matchSinglePatVar</span> <span class="n" style="color: #333;">var</span> <span class="n" style="color: #333;"><span class="idiff left">mb_scrut</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">match_result</span></span>
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<pre style="margin: 0;"> <span id="LC878" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT2</span><span class="p">(</span> <span class="n" style="color: #333;">isInternalName</span> <span class="p">(</span><span class="n" style="color: #333;">idName</span> <span class="n" style="color: #333;">var</span><span class="p">),</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">var</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC879" class="line" lang="haskell"> <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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<pre style="margin: 0;"> <span id="LC880" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">locn</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getSrcSpanDs</span></span>
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<pre style="margin: 0;">-<span id="LC881" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC881" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Pattern match check warnings</span></span>
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<pre style="margin: 0;">-<span id="LC883" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">if</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">isMatchContextPmChecked</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">dflags</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">FromSource</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">ctx</span></span></span>
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<pre style="margin: 0;">-<span id="LC884" class="line" lang="haskell"> <span class="idiff left"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">then</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">checkSingle</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">dflags</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">DsMatchContext</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ctx</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">locn</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">var</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></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">pat</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">-<span id="LC885" class="line" lang="haskell"> <span class="idiff left"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">else</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pure</span></span><span class="idiff"> </span><span class="nb" style="color: #0086b3;"><span class="idiff right">(</span>)</span></span>
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<pre style="margin: 0;">+<span id="LC882" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;"><span class="idiff left">when</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">isMatchContextPmChecked</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">dflags</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">FromSource</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ctx</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>
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<pre style="margin: 0;">+<span id="LC883" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">addCoreScrutTmCs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">mb_scrut</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="n" style="color: #333;"><span class="idiff">var</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>
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<pre style="margin: 0;">+<span id="LC884" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">covCheckPatBind</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">DsMatchContext</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ctx</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">locn</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">var</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></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 right">pat</span></span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC885" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC886" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">eqn_info</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;">unLoc</span> <span class="p">(</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 class="p">)]</span></span>
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<pre style="margin: 0;"> <span id="LC887" 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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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/4798caa0fefd7adf4c5b85fa84a6f28fcc6b350b...1207576ac0cfdd3fe1ea00b5505f7c874613451e#7c474b472edbb70d6316b45cccdb0c78321e94d3"><strong>compiler/GHC/HsToCore/Match.hs-boot</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -29,6 +29,7 @@ matchSimply</td>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"><span class="n" style="color: #333;">matchSinglePatVar</span></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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<pre style="margin: 0;"> <span id="LC33" 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>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LPat</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span></span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/4798caa0fefd7adf4c5b85fa84a6f28fcc6b350b...1207576ac0cfdd3fe1ea00b5505f7c874613451e#ac0a6473a902628a18b3a470122e5cc1ce09de14"><strong>compiler/GHC/HsToCore/PmCheck.hs</strong></a>
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<pre style="margin: 0;">-<span id="LC1" 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="LC2" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Author: George Karachalias <george.karachalias@cs.kuleuven.be></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="cm" style="color: #998; font-style: italic;">Pattern Matching Coverage Checking.</span></span>
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<pre style="margin: 0;">-<span id="LC5" 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="LC6" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC7" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE CPP #-}</span></span>
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8
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<pre style="margin: 0;">-<span id="LC8" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE GADTs #-}</span></span>
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9
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<pre style="margin: 0;">-<span id="LC9" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE TupleSections #-}</span></span>
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10
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<pre style="margin: 0;">-<span id="LC10" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE ViewPatterns #-}</span></span>
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11
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<pre style="margin: 0;">-<span id="LC11" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE MultiWayIf #-}</span></span>
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<pre style="margin: 0;">-<span id="LC12" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE LambdaCase #-}</span></span>
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13
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<pre style="margin: 0;">-<span id="LC13" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE NamedFieldPuns #-}</span></span>
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14
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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="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 GADTs #-}</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 TupleSections #-}</span></span>
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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 ViewPatterns #-}</span></span>
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5
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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 MultiWayIf #-}</span></span>
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6
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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 LambdaCase #-}</span></span>
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7
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE DeriveFunctor #-}</span></span>
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8
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE NamedFieldPuns #-}</span></span>
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9
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE FlexibleInstances #-}</span></span>
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10
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="cd">-- | This module coverage checks pattern matches. It finds</span></span>
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<pre style="margin: 0;">+<span id="LC12" 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="LC13" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Uncovered patterns, certifying non-exhaustivity</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Redundant equations</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;">-- * Equations with an inaccessible right-hand-side</span></span>
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<pre style="margin: 0;">+<span id="LC16" 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="LC17" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The algorithm is based on the paper</span></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- [Lower Your Guards: A Compositional Pattern-Match Coverage Checker"](https://dl.acm.org/doi/abs/10.1145/3408989)</span></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;">--</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- There is an overview Figure 2 in there that's probably helpful.</span></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Here is an overview of how it's implemented, which follows the structure of</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the entry points such as 'covCheckMatches':</span></span>
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<pre style="margin: 0;">+<span id="LC23" 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="LC24" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 1. Desugar source syntax (like 'LMatch') to guard tree variants (like</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'GrdMatch'), with one of the desugaring functions (like 'desugarMatch').</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Follows Section 3.1 in the paper.</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 2. Coverage check guard trees (with a function like 'checkMatch') to get a</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'CheckResult', containing</span></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- a. The set of uncovered values, 'cr_uncov'</span></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- b. And an annotated tree variant (like 'AnnMatch') that captures</span></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- redundancy and inaccessibility information as 'RedSets' annotations</span></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Basically the UA function from Section 5.1. The Normalised Refinement Types</span></span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Nabla are modeled as 'Deltas' and checked in "GHC.HsToCore.PmCheck.Oracle".</span></span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 3. Collect redundancy information into a 'CIRB' with a function such</span></span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- as 'cirbsMatch'. Follows the R function from Figure 6 of the paper.</span></span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 4. Format and report uncovered patterns and redundant equations ('CIRB')</span></span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- with 'formatReportWarnings'. Basically job of the G function, plus proper</span></span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- pretty printing of the warnings (Section 5.4 of the paper).</span></span>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 5. Return 'Deltas' reaching syntactic sub-components for</span></span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note [Long-distance information]. Collected by functions such as</span></span>
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<pre style="margin: 0;">+<span id="LC41" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'ldiMatch'. See Section 4.1 of the paper.</span></span>
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<pre style="margin: 0;"> <span id="LC42" 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="LC43" 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="LC17" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">c<span class="idiff left">heckSingle</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">checkMatches</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">c</span>heckGRHSs</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC44" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">c<span class="idiff left">ovCheckPatBind</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">covCheckMatches</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">covC</span>heckGRHSs</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC45" 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="LC46" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC20" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">Type and Term Equality Propag</span>ation]</span></span>
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<pre style="margin: 0;">-<span id="LC21" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">addTyCs<span class="idiff left">Ds</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">add</span>ScrutTmCs</span></span>
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<pre style="margin: 0;">+<span id="LC47" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">Long-distance inform</span>ation]</span></span>
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">addTyCs</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">addCoreScrutTmCs</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">addHs</span>ScrutTmCs</span></span>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="haskell"> <span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="n" style="color: #333;">include</span> <span class="s" style="color: #d14;">"HsVersions.h"</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -37,7 +64,6 @@ import GHC.Tc.Utils.Zonk (shortCutLit)</td>
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<pre style="margin: 0;"> <span id="LC64" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Id</span></span>
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<pre style="margin: 0;"> <span id="LC65" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.ConLike</span></span>
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<pre style="margin: 0;"> <span id="LC66" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Name</span></span>
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<pre style="margin: 0;">-<span id="LC40" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Instance.Family</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.Builtin.Types</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="nn" style="color: #555;">GHC.Types.SrcLoc</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;">GHC.Utils.Misc</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">@@ -62,35 +88,148 @@ import GHC.Core.Type</td>
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<pre style="margin: 0;"> <span id="LC88" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.HsToCore.Utils</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">isTrueLHsExpr</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC89" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.Maybe</span></span>
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<pre style="margin: 0;"> <span id="LC90" 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="LC65" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Monad</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">concatMapM</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC91" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Monad</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">concatMapM</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">mapMaybeM</span></span><span class="p">)</span></span>
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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="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="LC94" 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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69
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<pre style="margin: 0;"> <span id="LC95" 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="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="LC96" 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 class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC97" 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;">NE</span></span>
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<pre style="margin: 0;">+<span id="LC98" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Coerce</span></span>
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<pre style="margin: 0;"> <span id="LC99" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC72" 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="LC73" 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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<pre style="margin: 0;">-<span id="LC74" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">\begin{enumerate}</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;"> \item Equations that are redundant</span></span>
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<pre style="margin: 0;">-<span id="LC76" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> \item Equations with inaccessible right-hand-side</span></span>
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77
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<pre style="margin: 0;">-<span id="LC77" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> \item Exhaustiveness</span></span>
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<pre style="margin: 0;">-<span id="LC78" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">\end{enumerate}</span></span>
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100
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<pre style="margin: 0;">+<span id="LC100" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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101
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<pre style="margin: 0;">+<span id="LC101" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Exported entry points to the checker</span></span>
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102
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<pre style="margin: 0;">+<span id="LC102" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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79
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103
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<pre style="margin: 0;"> <span id="LC103" class="line" lang="haskell"></span>
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80
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<pre style="margin: 0;">-<span id="LC80" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The algorithm is based on the paper:</span></span>
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<pre style="margin: 0;">+<span id="LC104" class="line" lang="haskell"><span class="cd">-- | A non-empty delta that is initialised from the ambient refinement type</span></span>
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105
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<pre style="margin: 0;">+<span id="LC105" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- capturing long-distance information, or the trivially habitable 'Deltas' if</span></span>
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106
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<pre style="margin: 0;">+<span id="LC106" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the former is uninhabited.</span></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;">-- See Note [Recovering from unsatisfiable pattern-matching constraints].</span></span>
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<pre style="margin: 0;">+<span id="LC108" class="line" lang="haskell"><span class="n" style="color: #333;">getLdiDeltas</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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<pre style="margin: 0;">+<span id="LC109" class="line" lang="haskell"><span class="n" style="color: #333;">getLdiDeltas</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="LC110" 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;">getPmDeltas</span></span>
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<pre style="margin: 0;">+<span id="LC111" class="line" lang="haskell"> <span class="n" style="color: #333;">isInhabited</span> <span class="n" style="color: #333;">deltas</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;">case</span></span>
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<pre style="margin: 0;">+<span id="LC112" 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;">pure</span> <span class="n" style="color: #333;">deltas</span></span>
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<pre style="margin: 0;">+<span id="LC113" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">initDeltas</span></span>
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114
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<pre style="margin: 0;">+<span id="LC114" class="line" lang="haskell"></span>
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115
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<pre style="margin: 0;">+<span id="LC115" class="line" lang="haskell"><span class="cd">-- | Check a pattern binding (let, where) for exhaustiveness.</span></span>
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116
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<pre style="margin: 0;">+<span id="LC116" class="line" lang="haskell"><span class="n" style="color: #333;">covCheckPatBind</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DsMatchContext</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Pat</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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117
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<pre style="margin: 0;">+<span id="LC117" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [covCheckPatBind only checks PatBindRhs]</span></span>
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<pre style="margin: 0;">+<span id="LC118" class="line" lang="haskell"><span class="n" style="color: #333;">covCheckPatBind</span> <span class="n" style="color: #333;">ctxt</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DsMatchContext</span> <span class="kt" style="color: #458; font-weight: 600;">PatBindRhs</span> <span class="n" style="color: #333;">loc</span><span class="p">)</span> <span class="n" style="color: #333;">var</span> <span class="n" style="color: #333;">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="LC119" 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;">getLdiDeltas</span></span>
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120
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<pre style="margin: 0;">+<span id="LC120" class="line" lang="haskell"> <span class="n" style="color: #333;">pat_bind</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">desugarPatBind</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">var</span> <span class="n" style="color: #333;">p</span></span>
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121
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<pre style="margin: 0;">+<span id="LC121" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"covCheckPatBind {"</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 class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">var</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">p</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">pat_bind</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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122
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<pre style="margin: 0;">+<span id="LC122" class="line" lang="haskell"> <span class="n" style="color: #333;">result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unCA</span> <span class="p">(</span><span class="n" style="color: #333;">checkPatBind</span> <span class="n" style="color: #333;">pat_bind</span><span class="p">)</span> <span class="n" style="color: #333;">missing</span></span>
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123
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<pre style="margin: 0;">+<span id="LC123" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"}: "</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">cr_uncov</span> <span class="n" style="color: #333;">result</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC124" class="line" lang="haskell"> <span class="n" style="color: #333;">formatReportWarnings</span> <span class="n" style="color: #333;">cirbsPatBind</span> <span class="n" style="color: #333;">ctxt</span> <span class="p">[</span><span class="n" style="color: #333;">var</span><span class="p">]</span> <span class="n" style="color: #333;">result</span></span>
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<pre style="margin: 0;">+<span id="LC125" class="line" lang="haskell"><span class="n" style="color: #333;">covCheckPatBind</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;">pure</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC126" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC127" 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="LC128" 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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<pre style="margin: 0;">+<span id="LC129" class="line" lang="haskell"><span class="n" style="color: #333;">covCheckGRHSs</span></span>
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<pre style="margin: 0;">+<span id="LC130" 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="LC131" 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="LC132" 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;">NonEmpty</span> <span class="kt" style="color: #458; font-weight: 600;">Deltas</span><span class="p">)</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="LC133" 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="LC134" class="line" lang="haskell"><span class="n" style="color: #333;">covCheckGRHSs</span> <span class="n" style="color: #333;">hs_ctxt</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="LC135" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">combined_loc</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="LC136" class="line" lang="haskell"> <span class="n" style="color: #333;">ctxt</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_ctxt</span> <span class="n" style="color: #333;">combined_loc</span></span>
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137
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<pre style="margin: 0;">+<span id="LC137" class="line" lang="haskell"> <span class="n" style="color: #333;">matches</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">desugarGRHSs</span> <span class="n" style="color: #333;">combined_loc</span> <span class="n" style="color: #333;">empty</span> <span class="n" style="color: #333;">guards</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;">missing</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getLdiDeltas</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;">tracePm</span> <span class="s" style="color: #d14;">"covCheckGRHSs"</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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140
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<pre style="margin: 0;">+<span id="LC140" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Guards:"</span><span class="p">])</span></span>
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141
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<pre style="margin: 0;">+<span id="LC141" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span></span>
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<td class="diff-line-num new new_line" data-linenumber="142" 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">
142
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<pre style="margin: 0;">+<span id="LC142" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">pprGRHSs</span> <span class="n" style="color: #333;">hs_ctxt</span> <span class="n" style="color: #333;">guards</span> <span class="o" style="font-weight: 600;">$$</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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143
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<pre style="margin: 0;">+<span id="LC143" class="line" lang="haskell"> <span class="n" style="color: #333;">result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unCA</span> <span class="p">(</span><span class="n" style="color: #333;">checkGRHSs</span> <span class="n" style="color: #333;">matches</span><span class="p">)</span> <span class="n" style="color: #333;">missing</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;">tracePm</span> <span class="s" style="color: #d14;">"}: "</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">cr_uncov</span> <span class="n" style="color: #333;">result</span><span class="p">))</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;">formatReportWarnings</span> <span class="n" style="color: #333;">cirbsGRHSs</span> <span class="n" style="color: #333;">ctxt</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">result</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;">return</span> <span class="p">(</span><span class="n" style="color: #333;">ldiGRHS</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">cr_ret</span> <span class="n" style="color: #333;">result</span><span class="p">)</span></span>
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147
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<pre style="margin: 0;">+<span id="LC147" class="line" lang="haskell"></span>
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148
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<pre style="margin: 0;">+<span id="LC148" 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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149
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<pre style="margin: 0;">+<span id="LC149" 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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150
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<pre style="margin: 0;">+<span id="LC150" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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151
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<pre style="margin: 0;">+<span id="LC151" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @</span></span>
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152
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<pre style="margin: 0;">+<span id="LC152" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- f x y | x == y = 1 -- match on x and y with two guarded RHSs</span></span>
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153
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<pre style="margin: 0;">+<span id="LC153" class="line" lang="haskell"><span class="cd">-- | otherwise = 2</span></span>
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154
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<pre style="margin: 0;">+<span id="LC154" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- f _ _ = 3 -- clause with a single, un-guarded RHS</span></span>
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155
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<pre style="margin: 0;">+<span id="LC155" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @</span></span>
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156
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<pre style="margin: 0;">+<span id="LC156" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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157
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<pre style="margin: 0;">+<span id="LC157" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns one non-empty 'Deltas' for 1.) each pattern of a 'Match' and 2.)</span></span>
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158
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<pre style="margin: 0;">+<span id="LC158" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- each of a 'Match'es 'GRHS' for Note [Long-distance information].</span></span>
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159
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<pre style="margin: 0;">+<span id="LC159" 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="LC160" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Special case: When there are /no matches/, then the functionassumes it</span></span>
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161
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<pre style="margin: 0;">+<span id="LC161" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- checks and @-XEmptyCase@ with only a single match variable.</span></span>
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162
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<pre style="margin: 0;">+<span id="LC162" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Checking EmptyCase].</span></span>
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163
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<pre style="margin: 0;">+<span id="LC163" class="line" lang="haskell"><span class="n" style="color: #333;">covCheckMatches</span></span>
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<pre style="margin: 0;">+<span id="LC164" 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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165
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<pre style="margin: 0;">+<span id="LC165" 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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166
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<pre style="margin: 0;">+<span id="LC166" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="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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167
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<pre style="margin: 0;">+<span id="LC167" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</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 class="c1" style="color: #998; font-style: italic;">-- ^ One covered 'Deltas' per Match and</span></span>
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168
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<pre style="margin: 0;">+<span id="LC168" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- GRHS, for long distance info.</span></span>
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169
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<pre style="margin: 0;">+<span id="LC169" class="line" lang="haskell"><span class="n" style="color: #333;">covCheckMatches</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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170
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<pre style="margin: 0;">+<span id="LC170" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We have to force @missing@ before printing out the trace message,</span></span>
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171
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<pre style="margin: 0;">+<span id="LC171" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- otherwise we get interleaved output from the solver. This function</span></span>
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172
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<pre style="margin: 0;">+<span id="LC172" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- should be strict in @missing@ anyway!</span></span>
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173
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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="n" style="color: #333;">missing</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getLdiDeltas</span></span>
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174
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<pre style="margin: 0;">+<span id="LC174" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"covCheckMatches {"</span> <span class="o" style="font-weight: 600;">$</span></span>
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175
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<pre style="margin: 0;">+<span id="LC175" class="line" lang="haskell"> <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 class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">vars</span><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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176
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<pre style="margin: 0;">+<span id="LC176" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span></span>
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<td class="diff-line-num new new_line" data-linenumber="177" 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">
177
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<pre style="margin: 0;">+<span id="LC177" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">vcat</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;">matches</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$$</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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178
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<pre style="margin: 0;">+<span id="LC178" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="kt" style="color: #458; font-weight: 600;">NE</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">nonEmpty</span> <span class="n" style="color: #333;">matches</span> <span class="kr" style="font-weight: 600;">of</span></span>
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179
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<pre style="margin: 0;">+<span id="LC179" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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180
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<pre style="margin: 0;">+<span id="LC180" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This must be an -XEmptyCase. See Note [Checking EmptyCase]</span></span>
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181
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<pre style="margin: 0;">+<span id="LC181" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">var</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">only</span> <span class="n" style="color: #333;">vars</span></span>
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182
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<pre style="margin: 0;">+<span id="LC182" class="line" lang="haskell"> <span class="n" style="color: #333;">empty_case</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">desugarEmptyCase</span> <span class="n" style="color: #333;">var</span></span>
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183
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<pre style="margin: 0;">+<span id="LC183" class="line" lang="haskell"> <span class="n" style="color: #333;">result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unCA</span> <span class="p">(</span><span class="n" style="color: #333;">checkEmptyCase</span> <span class="n" style="color: #333;">empty_case</span><span class="p">)</span> <span class="n" style="color: #333;">missing</span></span>
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184
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<pre style="margin: 0;">+<span id="LC184" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"}: "</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">cr_uncov</span> <span class="n" style="color: #333;">result</span><span class="p">))</span></span>
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185
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<pre style="margin: 0;">+<span id="LC185" class="line" lang="haskell"> <span class="n" style="color: #333;">formatReportWarnings</span> <span class="n" style="color: #333;">cirbsEmptyCase</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">vars</span> <span class="n" style="color: #333;">result</span></span>
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186
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<pre style="margin: 0;">+<span id="LC186" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<td class="diff-line-num new new_line" data-linenumber="187" 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">
187
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<pre style="margin: 0;">+<span id="LC187" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</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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188
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<pre style="margin: 0;">+<span id="LC188" class="line" lang="haskell"> <span class="n" style="color: #333;">matches</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">desugarMatches</span> <span class="n" style="color: #333;">vars</span> <span class="n" style="color: #333;">matches</span></span>
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189
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<pre style="margin: 0;">+<span id="LC189" class="line" lang="haskell"> <span class="n" style="color: #333;">result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unCA</span> <span class="p">(</span><span class="n" style="color: #333;">checkMatchGroup</span> <span class="n" style="color: #333;">matches</span><span class="p">)</span> <span class="n" style="color: #333;">missing</span></span>
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190
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<pre style="margin: 0;">+<span id="LC190" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"}: "</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">cr_uncov</span> <span class="n" style="color: #333;">result</span><span class="p">))</span></span>
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191
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<pre style="margin: 0;">+<span id="LC191" class="line" lang="haskell"> <span class="n" style="color: #333;">formatReportWarnings</span> <span class="n" style="color: #333;">cirbsMatchGroup</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">vars</span> <span class="n" style="color: #333;">result</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;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NE</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">toList</span> <span class="p">(</span><span class="n" style="color: #333;">ldiMatchGroup</span> <span class="p">(</span><span class="n" style="color: #333;">cr_ret</span> <span class="n" style="color: #333;">result</span><span class="p">)))</span></span>
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193
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<pre style="margin: 0;">+<span id="LC193" class="line" lang="haskell"></span>
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194
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<pre style="margin: 0;">+<span id="LC194" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [covCheckPatBind only checks PatBindRhs]</span></span>
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195
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<pre style="margin: 0;">+<span id="LC195" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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196
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<pre style="margin: 0;">+<span id="LC196" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">@covCheckPatBind@'s sole purpose is to check vanilla pattern bindings, like</span></span>
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197
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<pre style="margin: 0;">+<span id="LC197" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">@x :: Int; Just x = e@, which is in a @PatBindRhs@ context.</span></span>
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198
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<pre style="margin: 0;">+<span id="LC198" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But its caller is also called for individual pattern guards in a @StmtCtxt@.</span></span>
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199
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<pre style="margin: 0;">+<span id="LC199" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For example, both pattern guards in @f x y | True <- x, False <- y = ...@ will</span></span>
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200
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<pre style="margin: 0;">+<span id="LC200" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">go through this function. It makes no sense to do coverage checking there:</span></span>
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201
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<pre style="margin: 0;">+<span id="LC201" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Pattern guards may well fail. Fall-through is not an unrecoverable panic,</span></span>
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202
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<pre style="margin: 0;">+<span id="LC202" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> but rather behavior the programmer expects, so inexhaustivity should not be</span></span>
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203
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<pre style="margin: 0;">+<span id="LC203" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> reported.</span></span>
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204
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<pre style="margin: 0;">+<span id="LC204" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Redundancy is already reported for the whole GRHS via one of the other</span></span>
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205
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<pre style="margin: 0;">+<span id="LC205" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> exported coverage checking functions. Also reporting individual redundant</span></span>
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206
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<pre style="margin: 0;">+<span id="LC206" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> guards is... redundant. See #17646.</span></span>
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207
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<pre style="margin: 0;">+<span id="LC207" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that we can't just omit checking of @StmtCtxt@ altogether (by adjusting</span></span>
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208
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<pre style="margin: 0;">+<span id="LC208" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'isMatchContextPmChecked'), because that affects the other checking functions,</span></span>
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209
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<pre style="margin: 0;">+<span id="LC209" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">too.</span></span>
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210
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<pre style="margin: 0;">+<span id="LC210" class="line" lang="haskell"></span>
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211
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<pre style="margin: 0;">+<span id="LC211" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Checking EmptyCase]</span></span>
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212
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<pre style="margin: 0;">+<span id="LC212" 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="LC213" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-XEmptyCase is useful for matching on empty data types like 'Void'. For example,</span></span>
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214
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<pre style="margin: 0;">+<span id="LC214" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the following is a complete match:</span></span>
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81
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215
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<pre style="margin: 0;"> <span id="LC215" class="line" lang="haskell"></span>
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82
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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 class="idiff left right">"GADTs Meet Their Match:</span></span></span>
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83
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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 class="idiff left right"> Pattern-matching Warnings That Account for GADTs, Guards, and Laziness"</span></span></span>
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216
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<pre style="margin: 0;">+<span id="LC216" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right"> f :: Void -> ()</span></span></span>
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217
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<pre style="margin: 0;">+<span id="LC217" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">f x = case x of {}</span></span></span>
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84
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218
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<pre style="margin: 0;"> <span id="LC218" class="line" lang="haskell"></span>
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85
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<pre style="margin: 0;">-<span id="LC85" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> https://www.microsoft.com/en-us/research/wp-content/uploads/2016/08/gadtpm-acm.pdf</span></span>
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219
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<pre style="margin: 0;">+<span id="LC219" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Really, -XEmptyCase is the only way to write a program that at the same time is</span></span>
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220
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<pre style="margin: 0;">+<span id="LC220" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">safe (@f _ = error "boom"@ is not because of ⊥), doesn't trigger a warning</span></span>
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221
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<pre style="margin: 0;">+<span id="LC221" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(@f !_ = error "inaccessible" has inaccessible RHS) and doesn't turn an</span></span>
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222
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<pre style="margin: 0;">+<span id="LC222" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">exception into divergence (@f x = f x@).</span></span>
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86
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223
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<pre style="margin: 0;"> <span id="LC223" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC87" 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="LC88" 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="LC89" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Pattern Match Check Types</span></span>
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<pre style="margin: 0;">-<span id="LC90" 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="LC91" 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="LC224" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Semantically, unlike every other case expression, -XEmptyCase is strict in its</span></span>
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<pre style="margin: 0;">+<span id="LC225" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">match var x, which rules out ⊥ as an inhabitant. So we add x /~ ⊥ to the</span></span>
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<pre style="margin: 0;">+<span id="LC226" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">initial Delta and check if there are any values left to match on.</span></span>
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227
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<pre style="margin: 0;"> <span id="LC227" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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228
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<pre style="margin: 0;"> <span id="LC228" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC229" 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="LC230" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Guard language</span></span>
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<pre style="margin: 0;">+<span id="LC231" 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="LC232" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC233" class="line" lang="haskell"><span class="cd">-- | A very simple language for pattern guards. Let bindings, bang patterns,</span></span>
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<pre style="margin: 0;"> <span id="LC234" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- and matching variables against flat constructor patterns.</span></span>
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<pre style="margin: 0;"> <span id="LC235" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">PmGrd</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">@@ -106,9 +245,9 @@ data PmGrd</td>
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<pre style="margin: 0;"> <span id="LC245" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC246" class="line" lang="haskell"></span>
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108
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<pre style="margin: 0;"> <span id="LC247" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | @PmBang x@ corresponds to a @seq x True@ guard.</span></span>
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109
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<pre style="margin: 0;">-<span id="LC109" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If the extra <span class="idiff left right">SrcInfo</span> is present, the bang guard came from a source</span></span>
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110
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<pre style="margin: 0;">-<span id="LC110" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- bang pattern, in which case we might want to report it as redundant<span class="idiff left right">,</span></span></span>
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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;">-- <span class="idiff left right">s</span>ee Note [Dead bang patterns].</span></span>
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248
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<pre style="margin: 0;">+<span id="LC248" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If the extra <span class="idiff left right">'SrcInfo'</span> is present, the bang guard came from a source</span></span>
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<pre style="margin: 0;">+<span id="LC249" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- bang pattern, in which case we might want to report it as redundant<span class="idiff left right">.</span></span></span>
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<pre style="margin: 0;">+<span id="LC250" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">S</span>ee Note [Dead bang patterns].</span></span>
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<pre style="margin: 0;"> <span id="LC251" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">PmBang</span> <span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC252" class="line" lang="haskell"> <span class="n" style="color: #333;">pm_id</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;">Id</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC253" class="line" lang="haskell"> <span class="n" style="color: #333;">pm_loc</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">SrcInfo</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">@@ -144,24 +283,115 @@ instance Monoid Precision where</td>
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<pre style="margin: 0;"> <span id="LC283" class="line" lang="haskell"> <span class="n" style="color: #333;">mempty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Precise</span></span>
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<pre style="margin: 0;"> <span id="LC284" class="line" lang="haskell"> <span class="n" style="color: #333;">mappend</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Semi</span><span class="o" style="font-weight: 600;">.<></span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC285" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC147" class="line" lang="haskell"><span class="cd">-- | Means by which we identify source location for later pretty-printing</span></span>
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<pre style="margin: 0;">-<span id="LC148" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- in a warning message. 'SDoc' for the equation to show, 'Located' for</span></span>
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<pre style="margin: 0;">-<span id="LC149" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the location.</span></span>
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<pre style="margin: 0;">+<span id="LC286" 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="LC287" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Guard tree language</span></span>
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<pre style="margin: 0;">+<span id="LC288" 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="LC289" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC290" class="line" lang="haskell"><span class="cd">-- | Means by which we identify a source construct for later pretty-printing in</span></span>
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<pre style="margin: 0;">+<span id="LC291" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- a warning message. 'SDoc' for the equation to show, 'Located' for the</span></span>
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<pre style="margin: 0;">+<span id="LC292" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- location.</span></span>
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<pre style="margin: 0;"> <span id="LC293" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">SrcInfo</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>
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<pre style="margin: 0;"> <span id="LC294" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC152" class="line" lang="haskell"><span class="cd">-- | A representation of the desugaring to 'PmGrd's of all clauses of a</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;">-- function definition/pattern match/etc.</span></span>
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<pre style="margin: 0;">-<span id="LC154" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">GrdTree</span></span>
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<pre style="margin: 0;">-<span id="LC155" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Rhs</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">SrcInfo</span></span>
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156
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<pre style="margin: 0;">-<span id="LC156" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Guard</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">PmGrd</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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157
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<pre style="margin: 0;">-<span id="LC157" 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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158
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<pre style="margin: 0;">-<span id="LC158" 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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159
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<pre style="margin: 0;">-<span id="LC159" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- of pattern matching.</span></span>
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160
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<pre style="margin: 0;">-<span id="LC160" 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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161
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<pre style="margin: 0;">-<span id="LC161" 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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162
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<pre style="margin: 0;">-<span id="LC162" 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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163
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<pre style="margin: 0;">-<span id="LC163" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- of pattern matching.</span></span>
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164
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<pre style="margin: 0;">-<span id="LC164" 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="LC295" class="line" lang="haskell"><span class="cd">-- | Redundancy sets, used to determine redundancy of RHSs and bang patterns</span></span>
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<pre style="margin: 0;">+<span id="LC296" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (later digested into a 'CIRB').</span></span>
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<pre style="margin: 0;">+<span id="LC297" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">RedSets</span></span>
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298
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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;">RedSets</span></span>
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299
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<pre style="margin: 0;">+<span id="LC299" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">rs_cov</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;">Deltas</span></span>
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<pre style="margin: 0;">+<span id="LC300" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ The /Covered/ set; the set of values reaching a particular program</span></span>
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301
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<pre style="margin: 0;">+<span id="LC301" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- point.</span></span>
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302
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<pre style="margin: 0;">+<span id="LC302" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">rs_div</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;">Deltas</span></span>
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<pre style="margin: 0;">+<span id="LC303" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ The /Diverging/ set; empty if no match can lead to divergence.</span></span>
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304
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<pre style="margin: 0;">+<span id="LC304" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If it wasn't empty, we have to turn redundancy warnings into</span></span>
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305
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<pre style="margin: 0;">+<span id="LC305" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- inaccessibility warnings for any subclauses.</span></span>
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306
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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;">rs_bangs</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">OrdList</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;">SrcInfo</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC307" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ If any of the 'Deltas' is empty, the corresponding 'SrcInfo' pin-points</span></span>
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<pre style="margin: 0;">+<span id="LC308" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- a bang pattern in source that is redundant. See Note [Dead bang patterns].</span></span>
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<pre style="margin: 0;">+<span id="LC309" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC310" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC311" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The following two type synonyms instantiate our tree structures to guard</span></span>
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<pre style="margin: 0;">+<span id="LC312" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- trees and annotated trees, respectively, by giving the types to attach as</span></span>
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<pre style="margin: 0;">+<span id="LC313" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- payload.</span></span>
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<pre style="margin: 0;">+<span id="LC314" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC315" class="line" lang="haskell"><span class="cd">-- | Used as tree payload pre-checking. The LYG guards to check.</span></span>
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<pre style="margin: 0;">+<span id="LC316" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">Pre</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PmGrd</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC317" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC318" class="line" lang="haskell"><span class="cd">-- | Used as tree payload post-checking. The redundancy info we elaborated.</span></span>
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<pre style="margin: 0;">+<span id="LC319" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">Post</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">RedSets</span></span>
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<pre style="margin: 0;">+<span id="LC320" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC321" class="line" lang="haskell"><span class="cd">-- | A guard tree denoting 'MatchGroup'.</span></span>
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<pre style="margin: 0;">+<span id="LC322" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">PmMatchGroup</span> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PmMatchGroup</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmMatch</span> <span class="n" style="color: #333;">p</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="LC324" class="line" lang="haskell"><span class="cd">-- | A guard tree denoting 'Match': A payload describing the pats and a bunch of</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;">-- GRHS.</span></span>
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<pre style="margin: 0;">+<span id="LC326" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">PmMatch</span> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PmMatch</span> <span class="p">{</span> <span class="n" style="color: #333;">pm_pats</span> <span class="o" style="font-weight: 600;">::</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;">pm_grhss</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmGRHS</span> <span class="n" style="color: #333;">p</span><span class="p">))</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC327" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC328" class="line" lang="haskell"><span class="cd">-- | A guard tree denoting 'GRHS': A payload describing the grds and a 'SrcInfo'</span></span>
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<pre style="margin: 0;">+<span id="LC329" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- useful for printing out in warnings messages.</span></span>
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<pre style="margin: 0;">+<span id="LC330" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">PmGRHS</span> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PmGRHS</span> <span class="p">{</span> <span class="n" style="color: #333;">pg_grds</span> <span class="o" style="font-weight: 600;">::</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;">pg_rhs</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;">SrcInfo</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC331" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC332" class="line" lang="haskell"><span class="cd">-- | A guard tree denoting an -XEmptyCase.</span></span>
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<pre style="margin: 0;">+<span id="LC333" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">PmEmptyCase</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PmEmptyCase</span> <span class="p">{</span> <span class="n" style="color: #333;">pe_var</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC334" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC335" class="line" lang="haskell"><span class="cd">-- | A guard tree denoting a pattern binding.</span></span>
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<pre style="margin: 0;">+<span id="LC336" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">PmPatBind</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="LC337" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- just reuse GrdGRHS and pretend its @SrcInfo@ is info on the /pattern/,</span></span>
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338
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<pre style="margin: 0;">+<span id="LC338" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- rather than on the pattern bindings.</span></span>
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<pre style="margin: 0;">+<span id="LC339" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmPatBind</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmGRHS</span> <span class="n" style="color: #333;">p</span><span class="p">)</span></span>
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340
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<pre style="margin: 0;">+<span id="LC340" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC341" class="line" lang="haskell"><span class="n" style="color: #333;">emptyRedSets</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">RedSets</span></span>
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342
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<pre style="margin: 0;">+<span id="LC342" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Semigroup instance would be misleading!</span></span>
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<pre style="margin: 0;">+<span id="LC343" class="line" lang="haskell"><span class="n" style="color: #333;">emptyRedSets</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">RedSets</span> <span class="n" style="color: #333;">mempty</span> <span class="n" style="color: #333;">mempty</span> <span class="n" style="color: #333;">mempty</span></span>
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344
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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;">pprSrcInfo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SrcInfo</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="LC346" class="line" lang="haskell"><span class="n" style="color: #333;">pprSrcInfo</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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347
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<pre style="margin: 0;">+<span id="LC347" class="line" lang="haskell"><span class="n" style="color: #333;">pprSrcInfo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">s</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="n" style="color: #333;">s</span></span>
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348
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<pre style="margin: 0;">+<span id="LC348" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC349" class="line" lang="haskell"><span class="cd">-- | Format LYG guards as @| True <- x, let x = 42, !z@</span></span>
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350
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<pre style="margin: 0;">+<span id="LC350" class="line" lang="haskell"><span class="n" style="color: #333;">pprLygGuards</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PmGrd</span><span class="p">]</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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351
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<pre style="margin: 0;">+<span id="LC351" class="line" lang="haskell"><span class="n" style="color: #333;">pprLygGuards</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;">empty</span></span>
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<pre style="margin: 0;">+<span id="LC352" class="line" lang="haskell"><span class="n" style="color: #333;">pprLygGuards</span> <span class="p">(</span><span class="n" style="color: #333;">g</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">gs</span><span class="p">)</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;">char</span> <span class="sc" style="color: #d14;">'|'</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">g</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="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">ppr</span><span class="p">)</span> <span class="n" style="color: #333;">gs</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC353" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC354" class="line" lang="haskell"><span class="cd">-- | Format a LYG sequence (e.g. 'Match'es of a 'MatchGroup' or 'GRHSs') as</span></span>
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<pre style="margin: 0;">+<span id="LC355" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @{ <first alt>; ...; <last alt> }@</span></span>
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<pre style="margin: 0;">+<span id="LC356" class="line" lang="haskell"><span class="n" style="color: #333;">pprLygSequence</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</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;">NonEmpty</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;">SDoc</span></span>
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357
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<pre style="margin: 0;">+<span id="LC357" class="line" lang="haskell"><span class="n" style="color: #333;">pprLygSequence</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NE</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">toList</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">as</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC358" class="line" lang="haskell"> <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;">as</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="LC359" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC360" 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="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmMatchGroup</span> <span class="kt" style="color: #458; font-weight: 600;">Pre</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="LC361" 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;">PmMatchGroup</span> <span class="n" style="color: #333;">matches</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprLygSequence</span> <span class="n" style="color: #333;">matches</span></span>
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362
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<pre style="margin: 0;">+<span id="LC362" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC363" 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="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmMatch</span> <span class="kt" style="color: #458; font-weight: 600;">Pre</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="LC364" 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;">PmMatch</span> <span class="p">{</span> <span class="n" style="color: #333;">pm_pats</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">grds</span><span class="p">,</span> <span class="n" style="color: #333;">pm_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>
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<pre style="margin: 0;">+<span id="LC365" class="line" lang="haskell"> <span class="n" style="color: #333;">pprLygGuards</span> <span class="n" style="color: #333;">grds</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">grhss</span></span>
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366
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<pre style="margin: 0;">+<span id="LC366" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC367" 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="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmGRHS</span> <span class="kt" style="color: #458; font-weight: 600;">Pre</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="LC368" 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;">PmGRHS</span> <span class="p">{</span> <span class="n" style="color: #333;">pg_grds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">grds</span><span class="p">,</span> <span class="n" style="color: #333;">pg_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span></span>
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369
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<pre style="margin: 0;">+<span id="LC369" class="line" lang="haskell"> <span class="n" style="color: #333;">pprLygGuards</span> <span class="n" style="color: #333;">grds</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"->"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pprSrcInfo</span> <span class="n" style="color: #333;">rhs</span></span>
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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="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmPatBind</span> <span class="kt" style="color: #458; font-weight: 600;">Pre</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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372
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<pre style="margin: 0;">+<span id="LC372" 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;">PmPatBind</span> <span class="kt" style="color: #458; font-weight: 600;">PmGRHS</span> <span class="p">{</span> <span class="n" style="color: #333;">pg_grds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">grds</span><span class="p">,</span> <span class="n" style="color: #333;">pg_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bind</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span></span>
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373
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<pre style="margin: 0;">+<span id="LC373" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">bind</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pprLygGuards</span> <span class="n" style="color: #333;">grds</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"..."</span></span>
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374
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<pre style="margin: 0;">+<span id="LC374" class="line" lang="haskell"></span>
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375
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<pre style="margin: 0;">+<span id="LC375" 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;">PmEmptyCase</span> <span class="kr" style="font-weight: 600;">where</span></span>
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376
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<pre style="margin: 0;">+<span id="LC376" 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;">PmEmptyCase</span> <span class="p">{</span> <span class="n" style="color: #333;">pe_var</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">var</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span></span>
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377
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<pre style="margin: 0;">+<span id="LC377" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"<empty case on "</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">var</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">">"</span></span>
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378
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<pre style="margin: 0;">+<span id="LC378" class="line" lang="haskell"></span>
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379
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<pre style="margin: 0;">+<span id="LC379" class="line" lang="haskell"><span class="n" style="color: #333;">pprRedSets</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">RedSets</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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380
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<pre style="margin: 0;">+<span id="LC380" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- It's useful to change this definition for different verbosity levels in</span></span>
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381
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<pre style="margin: 0;">+<span id="LC381" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- printf-debugging</span></span>
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382
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<pre style="margin: 0;">+<span id="LC382" class="line" lang="haskell"><span class="n" style="color: #333;">pprRedSets</span> <span class="kt" style="color: #458; font-weight: 600;">RedSets</span> <span class="p">{</span> <span class="n" style="color: #333;">rs_cov</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">_cov</span><span class="p">,</span> <span class="n" style="color: #333;">rs_div</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">_div</span><span class="p">,</span> <span class="n" style="color: #333;">rs_bangs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">_bangs</span> <span class="p">}</span></span>
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383
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<pre style="margin: 0;">+<span id="LC383" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">empty</span></span>
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384
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<pre style="margin: 0;">+<span id="LC384" class="line" lang="haskell"></span>
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385
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<pre style="margin: 0;">+<span id="LC385" 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="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmMatchGroup</span> <span class="kt" style="color: #458; font-weight: 600;">Post</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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386
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<pre style="margin: 0;">+<span id="LC386" 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;">PmMatchGroup</span> <span class="n" style="color: #333;">matches</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprLygSequence</span> <span class="n" style="color: #333;">matches</span></span>
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387
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<pre style="margin: 0;">+<span id="LC387" class="line" lang="haskell"></span>
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388
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<pre style="margin: 0;">+<span id="LC388" 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="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmMatch</span> <span class="kt" style="color: #458; font-weight: 600;">Post</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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389
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<pre style="margin: 0;">+<span id="LC389" 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;">PmMatch</span> <span class="p">{</span> <span class="n" style="color: #333;">pm_pats</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">red</span><span class="p">,</span> <span class="n" style="color: #333;">pm_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>
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390
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<pre style="margin: 0;">+<span id="LC390" class="line" lang="haskell"> <span class="n" style="color: #333;">pprRedSets</span> <span class="n" style="color: #333;">red</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">grhss</span></span>
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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="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmGRHS</span> <span class="kt" style="color: #458; font-weight: 600;">Post</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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393
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<pre style="margin: 0;">+<span id="LC393" 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;">PmGRHS</span> <span class="p">{</span> <span class="n" style="color: #333;">pg_grds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">red</span><span class="p">,</span> <span class="n" style="color: #333;">pg_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span></span>
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394
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<pre style="margin: 0;">+<span id="LC394" class="line" lang="haskell"> <span class="n" style="color: #333;">pprRedSets</span> <span class="n" style="color: #333;">red</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"->"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pprSrcInfo</span> <span class="n" style="color: #333;">rhs</span></span>
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395
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<pre style="margin: 0;"> <span id="LC395" class="line" lang="haskell"></span>
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166
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396
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<pre style="margin: 0;"> <span id="LC396" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Dead bang patterns]</span></span>
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167
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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;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~</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">@@ -178,7 +408,7 @@ that under no circumstances can force a thunk that wasn't already forced.</td>
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178
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408
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<pre style="margin: 0;"> <span id="LC408" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Dead bangs are a form of redundant bangs; see below.</span></span>
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179
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409
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<pre style="margin: 0;"> <span id="LC409" class="line" lang="haskell"></span>
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180
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<pre style="margin: 0;"> <span id="LC410" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We can detect dead bang patterns by checking whether @x ~ ⊥@ is satisfiable</span></span>
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181
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<pre style="margin: 0;">-<span id="LC181" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">where the PmBang appears in 'checkGrd<span class="idiff left right">Tree</span>'. If not, then clearly the bang is</span></span>
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<pre style="margin: 0;">+<span id="LC411" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">where the PmBang appears in 'checkGrd'. If not, then clearly the bang is</span></span>
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182
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<pre style="margin: 0;"> <span id="LC412" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">dead. Such a dead bang is then indicated in the annotated pattern-match tree by</span></span>
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183
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<pre style="margin: 0;"> <span id="LC413" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">a 'RedundantSrcBang' wrapping. In 'redundantAndInaccessibles', we collect</span></span>
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184
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<pre style="margin: 0;"> <span id="LC414" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">all dead bangs to warn about.</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -197,235 +427,9 @@ it is redundant with the forcing done by the () match. We currently don't</td>
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197
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427
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<pre style="margin: 0;"> <span id="LC427" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">detect redundant bangs that aren't dead.</span></span>
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198
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<pre style="margin: 0;"> <span id="LC428" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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429
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<pre style="margin: 0;"> <span id="LC429" class="line" lang="haskell"></span>
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200
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<pre style="margin: 0;">-<span id="LC200" class="line" lang="haskell"><span class="cd">-- | The digest of 'checkGrdTree', representing the annotated pattern-match</span></span>
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201
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<pre style="margin: 0;">-<span id="LC201" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- tree. 'extractRedundancyInfo' can figure out redundant and proper</span></span>
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202
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<pre style="margin: 0;">-<span id="LC202" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- inaccessible RHSs from this, as well as dead bangs.</span></span>
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203
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<pre style="margin: 0;">-<span id="LC203" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">AnnotatedTree</span></span>
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<pre style="margin: 0;">-<span id="LC204" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">AccessibleRhs</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;">SrcInfo</span></span>
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<pre style="margin: 0;">-<span id="LC205" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ A RHS deemed accessible. The 'Deltas' is the (non-empty) set of covered</span></span>
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<pre style="margin: 0;">-<span id="LC206" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- values.</span></span>
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<pre style="margin: 0;">-<span id="LC207" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">InaccessibleRhs</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">SrcInfo</span></span>
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<pre style="margin: 0;">-<span id="LC208" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ A RHS deemed inaccessible; it covers no value.</span></span>
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<pre style="margin: 0;">-<span id="LC209" 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="LC210" 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="LC211" 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="LC212" 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;">Deltas</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>
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<pre style="margin: 0;">-<span id="LC213" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ @SequenceAnn inc ts@ mirrors @'Sequence' ts@ for preserving the</span></span>
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<pre style="margin: 0;">-<span id="LC214" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- skeleton of a 'GrdTree's @ts@. It also carries the set of incoming values</span></span>
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<pre style="margin: 0;">-<span id="LC215" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- @inc@.</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="kt" style="color: #458; font-weight: 600;">RedundantSrcBang</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">SrcInfo</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="LC217" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ For tracking redundant bangs. See Note [Dead bang patterns]</span></span>
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<pre style="margin: 0;">-<span id="LC218" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC219" class="line" lang="haskell"><span class="n" style="color: #333;">pprSrcInfo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SrcInfo</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="LC220" class="line" lang="haskell"><span class="n" style="color: #333;">pprSrcInfo</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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<pre style="margin: 0;">-<span id="LC221" class="line" lang="haskell"><span class="n" style="color: #333;">pprSrcInfo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">s</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="n" style="color: #333;">s</span></span>
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<pre style="margin: 0;">-<span id="LC222" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC223" 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;">GrdTree</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC224" 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;">Rhs</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;">"->"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pprSrcInfo</span> <span class="n" style="color: #333;">info</span></span>
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<pre style="margin: 0;">-<span id="LC225" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Format guards as "| True <- x, let x = 42, !z"</span></span>
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<pre style="margin: 0;">-<span id="LC226" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <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;">Guard</span><span class="p">{}</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;">prefix</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;">grds</span><span class="p">))</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="LC227" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC228" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">t</span><span class="p">,</span> <span class="n" style="color: #333;">grds</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">collect_grds</span> <span class="n" style="color: #333;">g</span></span>
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<pre style="margin: 0;">-<span id="LC229" class="line" lang="haskell"> <span class="n" style="color: #333;">collect_grds</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Guard</span> <span class="n" style="color: #333;">grd</span> <span class="n" style="color: #333;">t</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">grd</span> <span class="o" style="font-weight: 600;">:</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">collect_grds</span> <span class="n" style="color: #333;">t</span></span>
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<pre style="margin: 0;">-<span id="LC230" 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="LC231" 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="LC232" 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="LC233" 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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<pre style="margin: 0;">-<span id="LC234" 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="LC235" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC236" 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="LC237" 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;">_delta</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;">parens</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">_delta</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pprSrcInfo</span> <span class="n" style="color: #333;">info</span></span>
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<pre style="margin: 0;">-<span id="LC238" 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;">pprSrcInfo</span> <span class="n" style="color: #333;">info</span></span>
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<pre style="margin: 0;">-<span id="LC239" 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="LC240" 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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<pre style="margin: 0;">-<span id="LC241" 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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<pre style="margin: 0;">-<span id="LC242" 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;">RedundantSrcBang</span> <span class="n" style="color: #333;">l</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;">"redundant bang"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pprSrcInfo</span> <span class="n" style="color: #333;">l</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="LC243" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC244" class="line" lang="haskell"><span class="cd">-- | Lift 'addPmCts' over 'Deltas'.</span></span>
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<pre style="margin: 0;">-<span id="LC245" 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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<pre style="margin: 0;">-<span id="LC246" class="line" lang="haskell"><span class="n" style="color: #333;">addPmCtsDeltas</span> <span class="n" style="color: #333;">deltas</span> <span class="n" style="color: #333;">cts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">liftDeltasM</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">d</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addPmCts</span> <span class="n" style="color: #333;">d</span> <span class="n" style="color: #333;">cts</span><span class="p">)</span> <span class="n" style="color: #333;">deltas</span></span>
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<pre style="margin: 0;">-<span id="LC247" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC248" class="line" lang="haskell"><span class="cd">-- | 'addPmCtsDeltas' a single 'PmCt'.</span></span>
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<pre style="margin: 0;">-<span id="LC249" class="line" lang="haskell"><span class="n" style="color: #333;">addPmCtDeltas</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;">PmCt</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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<pre style="margin: 0;">-<span id="LC250" class="line" lang="haskell"><span class="n" style="color: #333;">addPmCtDeltas</span> <span class="n" style="color: #333;">deltas</span> <span class="n" style="color: #333;">ct</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="p">(</span><span class="n" style="color: #333;">unitBag</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC251" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC252" class="line" lang="haskell"><span class="cd">-- | Test if any of the 'Delta's is inhabited. Currently this is pure, because</span></span>
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<pre style="margin: 0;">-<span id="LC253" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- we preserve the invariant that there are no uninhabited 'Delta's. But that</span></span>
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<pre style="margin: 0;">-<span id="LC254" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- could change in the future, for example by implementing this function in</span></span>
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<pre style="margin: 0;">-<span id="LC255" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- terms of @notNull <$> provideEvidence 1 ds@.</span></span>
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<pre style="margin: 0;">-<span id="LC256" class="line" lang="haskell"><span class="n" style="color: #333;">isInhabited</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;">Bool</span></span>
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<pre style="margin: 0;">-<span id="LC257" class="line" lang="haskell"><span class="n" style="color: #333;">isInhabited</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MkDeltas</span> <span class="n" style="color: #333;">ds</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">ds</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC258" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC259" class="line" lang="haskell"><span class="cd">-- | Pattern-match check result</span></span>
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<pre style="margin: 0;">-<span id="LC260" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">CheckResult</span></span>
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<pre style="margin: 0;">-<span id="LC261" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CheckResult</span></span>
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<pre style="margin: 0;">-<span id="LC262" 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="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="LC263" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Captures redundancy info for each clause in the original program.</span></span>
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<pre style="margin: 0;">-<span id="LC264" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (for -Woverlapping-patterns)</span></span>
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<pre style="margin: 0;">-<span id="LC265" 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="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">Deltas</span></span>
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<pre style="margin: 0;">-<span id="LC266" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ The set of uncovered values falling out at the bottom.</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;">-- (for -Wincomplete-patterns)</span></span>
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<pre style="margin: 0;">-<span id="LC268" 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="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">Precision</span></span>
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<pre style="margin: 0;">-<span id="LC269" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ A flag saying whether we ran into the 'maxPmCheckModels' limit for the</span></span>
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<pre style="margin: 0;">-<span id="LC270" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- purpose of suggesting to crank it up in the warning message</span></span>
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<pre style="margin: 0;">-<span id="LC271" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC272" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC273" 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;">CheckResult</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC274" 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;">CheckResult</span> <span class="n" style="color: #333;">c</span> <span class="n" style="color: #333;">unc</span> <span class="n" style="color: #333;">pc</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC275" 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;">"CheckResult"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr_precision</span> <span class="n" style="color: #333;">pc</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;">fsep</span></span>
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<pre style="margin: 0;">-<span id="LC276" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">field</span> <span class="s" style="color: #d14;">"clauses"</span> <span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">comma</span></span>
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<pre style="margin: 0;">-<span id="LC277" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">field</span> <span class="s" style="color: #d14;">"uncov"</span> <span class="n" style="color: #333;">unc</span><span class="p">])</span></span>
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<pre style="margin: 0;">-<span id="LC278" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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279
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<pre style="margin: 0;">-<span id="LC279" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr_precision</span> <span class="kt" style="color: #458; font-weight: 600;">Precise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">empty</span></span>
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280
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<pre style="margin: 0;">-<span id="LC280" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr_precision</span> <span class="kt" style="color: #458; font-weight: 600;">Approximate</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"(Approximate)"</span></span>
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281
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<pre style="margin: 0;">-<span id="LC281" class="line" lang="haskell"> <span class="n" style="color: #333;">field</span> <span class="n" style="color: #333;">name</span> <span class="n" style="color: #333;">value</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">equals</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">value</span></span>
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<pre style="margin: 0;">-<span id="LC282" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC283" 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="LC284" 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="LC285" 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="LC286" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Entry points to the checker: checkSingle and checkMatches</span></span>
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<pre style="margin: 0;">-<span id="LC287" 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="LC288" 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="LC289" 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="LC290" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC291" class="line" lang="haskell"><span class="cd">-- | Check a single pattern binding (let) for exhaustiveness.</span></span>
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<pre style="margin: 0;">-<span id="LC292" class="line" lang="haskell"><span class="n" style="color: #333;">checkSingle</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsMatchContext</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Pat</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">-<span id="LC293" class="line" lang="haskell"><span class="n" style="color: #333;">checkSingle</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">ctxt</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DsMatchContext</span> <span class="n" style="color: #333;">kind</span> <span class="n" style="color: #333;">locn</span><span class="p">)</span> <span class="n" style="color: #333;">var</span> <span class="n" style="color: #333;">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="LC294" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"checkSingle"</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 class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">var</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">p</span><span class="p">])</span></span>
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<pre style="margin: 0;">-<span id="LC295" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We only ever need to run this in a context where we need exhaustivity</span></span>
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<pre style="margin: 0;">-<span id="LC296" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- warnings (so not in pattern guards or comprehensions, for example, because</span></span>
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<pre style="margin: 0;">-<span id="LC297" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- they are perfectly fine to fail).</span></span>
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<pre style="margin: 0;">-<span id="LC298" 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="LC299" 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="LC300" 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;">$</span> <span class="kr" style="font-weight: 600;">do</span></span>
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301
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<pre style="margin: 0;">-<span id="LC301" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- TODO: This could probably call checkMatches, like checkGRHSs.</span></span>
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<pre style="margin: 0;">-<span id="LC302" class="line" lang="haskell"> <span class="n" style="color: #333;">missing</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getPmDeltas</span></span>
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<pre style="margin: 0;">-<span id="LC303" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"checkSingle: missing"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">missing</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC304" class="line" lang="haskell"> <span class="n" style="color: #333;">fam_insts</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsGetFamInstEnvs</span></span>
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305
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<pre style="margin: 0;">-<span id="LC305" class="line" lang="haskell"> <span class="n" style="color: #333;">grd_tree</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkGrdTreeRhs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">locn</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">p</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">translatePat</span> <span class="n" style="color: #333;">fam_insts</span> <span class="n" style="color: #333;">var</span> <span class="n" style="color: #333;">p</span></span>
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<pre style="margin: 0;">-<span id="LC306" 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="LC307" 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="p">[</span><span class="n" style="color: #333;">var</span><span class="p">]</span> <span class="n" style="color: #333;">res</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="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="LC310" 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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<pre style="margin: 0;">-<span id="LC311" class="line" lang="haskell"><span class="n" style="color: #333;">checkGRHSs</span></span>
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<pre style="margin: 0;">-<span id="LC312" 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="LC313" 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="LC314" 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;">NonEmpty</span> <span class="kt" style="color: #458; font-weight: 600;">Deltas</span><span class="p">)</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="LC315" 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="LC316" class="line" lang="haskell"><span class="n" style="color: #333;">checkGRHSs</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="LC317" 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="LC318" 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="LC319" 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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<pre style="margin: 0;">-<span id="LC320" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Match</span> <span class="p">{</span> <span class="n" style="color: #333;">m_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">noExtField</span></span>
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<pre style="margin: 0;">-<span id="LC321" 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="LC322" 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="LC323" 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="LC324" 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="LC325" 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="LC326" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC327" 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="LC328" 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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<pre style="margin: 0;"> <span id="LC430" 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="LC330" 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="LC331" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- f x y | x == y = 1 -- match on x and y with two guarded RHSs</span></span>
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<pre style="margin: 0;">-<span id="LC332" class="line" lang="haskell"><span class="cd">-- | otherwise = 2</span></span>
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<pre style="margin: 0;">-<span id="LC333" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- f _ _ = 3 -- clause with a single, un-guarded RHS</span></span>
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<pre style="margin: 0;">-<span id="LC334" 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="LC431" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Desugaring source syntax to guard trees</span></span>
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<pre style="margin: 0;"> <span id="LC432" 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="LC336" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns one 'Deltas' for each GRHS, representing its covered values, or the</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;">-- incoming uncovered 'Deltas' (from 'getPmDeltas') if the GRHS is inaccessible.</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;">-- Since there is at least one /grhs/ per /match/, the list of 'Deltas' is at</span></span>
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<pre style="margin: 0;">-<span id="LC339" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- least as long as the list of matches.</span></span>
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<pre style="margin: 0;">-<span id="LC340" class="line" lang="haskell"><span class="n" style="color: #333;">checkMatches</span></span>
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<pre style="margin: 0;">-<span id="LC341" 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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<pre style="margin: 0;">-<span id="LC342" 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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<pre style="margin: 0;">-<span id="LC343" 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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<pre style="margin: 0;">-<span id="LC344" 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;">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 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="LC345" 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="LC346" 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="LC347" 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="LC348" 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="LC349" 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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<pre style="margin: 0;">-<span id="LC350" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span></span>
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<pre style="margin: 0;">-<span id="LC351" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">vcat</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;">matches</span><span class="p">)))</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;">init_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="LC354" class="line" lang="haskell"> <span class="n" style="color: #333;">missing</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">matches</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC355" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This must be an -XEmptyCase. See Note [Checking EmptyCase]</span></span>
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<pre style="margin: 0;">-<span id="LC356" 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="LC357" 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="LC358" 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="LC359" 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;">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>
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<pre style="margin: 0;">-<span id="LC360" 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="LC361" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC362" 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="LC363" 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="LC364" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC365" 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="LC366" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC367" 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="LC368" 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="LC369" 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="LC370" 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="LC371" 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="LC372" 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;">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="LC373" class="line" lang="haskell"><span class="n" style="color: #333;">extractRhsDeltas</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go_matches</span></span>
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<pre style="margin: 0;">-<span id="LC374" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC375" 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="LC376" 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="LC377" 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="LC378" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC379" 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="LC380" 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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381
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<pre style="margin: 0;">-<span id="LC381" 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="LC382" 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="LC383" 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="LC384" 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;">RedundantSrcBang</span> <span class="kr" style="font-weight: 600;">_</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="LC385" 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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386
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<pre style="margin: 0;">-<span id="LC386" 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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387
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<pre style="margin: 0;">-<span id="LC387" 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="LC388" class="line" lang="haskell"></span>
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389
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<pre style="margin: 0;">-<span id="LC389" 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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390
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<pre style="margin: 0;">-<span id="LC390" 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="LC391" 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="LC392" 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="LC393" 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="LC394" 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;">RedundantSrcBang</span> <span class="kr" style="font-weight: 600;">_</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="LC395" 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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396
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<pre style="margin: 0;">-<span id="LC396" 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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397
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<pre style="margin: 0;">-<span id="LC397" class="line" lang="haskell"></span>
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398
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<pre style="margin: 0;">-<span id="LC398" 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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399
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<pre style="margin: 0;">-<span id="LC399" 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="LC400" class="line" lang="haskell"></span>
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401
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<pre style="margin: 0;">-<span id="LC401" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Checking EmptyCase]</span></span>
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402
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<pre style="margin: 0;">-<span id="LC402" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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403
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<pre style="margin: 0;">-<span id="LC403" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-XEmptyCase is useful for matching on empty data types like 'Void'. For example,</span></span>
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404
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<pre style="margin: 0;">-<span id="LC404" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the following is a complete match:</span></span>
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405
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<pre style="margin: 0;">-<span id="LC405" class="line" lang="haskell"></span>
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406
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<pre style="margin: 0;">-<span id="LC406" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: Void -> ()</span></span>
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407
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<pre style="margin: 0;">-<span id="LC407" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f x = case x of {}</span></span>
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408
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<pre style="margin: 0;">-<span id="LC408" class="line" lang="haskell"></span>
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409
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<pre style="margin: 0;">-<span id="LC409" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Really, -XEmptyCase is the only way to write a program that at the same time is</span></span>
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410
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<pre style="margin: 0;">-<span id="LC410" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">safe (@f _ = error "boom"@ is not because of ⊥), doesn't trigger a warning</span></span>
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411
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<pre style="margin: 0;">-<span id="LC411" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(@f !_ = error "inaccessible" has inaccessible RHS) and doesn't turn an</span></span>
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412
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<pre style="margin: 0;">-<span id="LC412" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">exception into divergence (@f x = f x@).</span></span>
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<pre style="margin: 0;">-<span id="LC413" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC414" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Semantically, unlike every other case expression, -XEmptyCase is strict in its</span></span>
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<pre style="margin: 0;">-<span id="LC415" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">match var x, which rules out ⊥ as an inhabitant. So we add x /~ ⊥ to the</span></span>
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<pre style="margin: 0;">-<span id="LC416" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">initial Delta and check if there are any values left to match on.</span></span>
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<pre style="margin: 0;">-<span id="LC417" 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="LC418" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC419" 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="LC420" 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="LC421" 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="LC422" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Transform source syntax to *our* syntax</span></span>
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<pre style="margin: 0;">-<span id="LC423" 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="LC424" 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="LC425" 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="LC426" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC427" 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="LC428" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Utilities</span></span>
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<pre style="margin: 0;"> <span id="LC433" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC434" class="line" lang="haskell"><span class="cd">-- | Smart constructor that eliminates trivial lets</span></span>
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<pre style="margin: 0;"> <span id="LC435" class="line" lang="haskell"><span class="n" style="color: #333;">mkPmLetVar</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">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">@@ -458,7 +462,7 @@ mkListGrds a ((x, head_grds):xs) = do</td>
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<pre style="margin: 0;"> <span id="LC462" class="line" lang="haskell"><span class="cd">-- | Create a 'GrdVec' refining a match variable to a 'PmLit'.</span></span>
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<pre style="margin: 0;"> <span id="LC463" class="line" lang="haskell"><span class="n" style="color: #333;">mkPmLitGrds</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmLit</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;">GrdVec</span></span>
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<pre style="margin: 0;"> <span id="LC464" class="line" lang="haskell"><span class="n" style="color: #333;">mkPmLitGrds</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmLit</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmLitString</span> <span class="n" style="color: #333;">s</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="LC461" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We <span class="idiff left right">translate</span> String literals to list literals for better overlap reasoning.</span></span>
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<pre style="margin: 0;">+<span id="LC465" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We <span class="idiff left right">desugar</span> String literals to list literals for better overlap reasoning.</span></span>
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<pre style="margin: 0;"> <span id="LC466" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- It's a little unfortunate we do this here rather than in</span></span>
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<pre style="margin: 0;"> <span id="LC467" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 'GHC.HsToCore.PmCheck.Oracle.trySolve' and</span></span>
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<pre style="margin: 0;"> <span id="LC468" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 'GHC.HsToCore.PmCheck.Oracle.addRefutableAltCon', but it's so much simpler</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">@@ -476,37 +480,34 @@ mkPmLitGrds x lit = do</td>
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<pre style="margin: 0;"> <span id="LC480" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">pm_con_args</span> <span class="o" style="font-weight: 600;">=</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="LC481" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">[</span><span class="n" style="color: #333;">grd</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC482" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC479" 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="LC480" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Transform (Pat Id) into GrdVec</span></span>
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<pre style="margin: 0;">-<span id="LC481" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC482" class="line" lang="haskell"><span class="cd">-- | @translatePat _ x pat@ transforms @pat@ into a 'GrdVec', where</span></span>
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<pre style="margin: 0;">+<span id="LC483" class="line" lang="haskell"><span class="cd">-- | @desugarPat _ x pat@ transforms @pat@ into a 'GrdVec', where</span></span>
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<pre style="margin: 0;"> <span id="LC484" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the variable representing the match is @x@.</span></span>
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<pre style="margin: 0;">-<span id="LC484" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">translatePat</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">FamInstEnvs</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">-></span></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Pat</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</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;">GrdVec</span></span>
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<pre style="margin: 0;">-<span id="LC485" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">translatePat</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">fam_insts</span></span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">pat</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">pat</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC485" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">desugarPat</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">::</span></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Pat</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</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;">GrdVec</span></span>
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<pre style="margin: 0;">+<span id="LC486" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left right">desugarPat</span></span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">pat</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">pat</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC487" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">WildPat</span> <span class="n" style="color: #333;">_ty</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;">[]</span></span>
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<pre style="margin: 0;"> <span id="LC488" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">VarPat</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">mkPmLetVar</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">y</span><span class="p">)</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC488" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ParPat</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;"><span class="idiff left">translateLPat</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">fam_insts</span></span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">p</span></span>
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<pre style="margin: 0;">+<span id="LC489" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ParPat</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;"><span class="idiff left right">desugarLPat</span></span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">p</span></span>
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<pre style="margin: 0;"> <span id="LC490" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">LazyPat</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;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="c1" style="color: #998; font-style: italic;">-- like a wildcard</span></span>
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<pre style="margin: 0;"> <span id="LC491" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">BangPat</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">p</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">l</span> <span class="n" style="color: #333;">p'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;"> <span id="LC492" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Add the bang in front of the list, because it will happen before any</span></span>
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<pre style="margin: 0;"> <span id="LC493" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- nested stuff.</span></span>
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<pre style="margin: 0;">-<span id="LC493" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmBang</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">pm_loc</span> <span class="o" style="font-weight: 600;">:</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;"><span class="idiff left">translateLPat</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">fam_insts</span></span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">p</span></span>
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<pre style="margin: 0;">-<span id="LC494" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">pm_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">l</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">p'</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC494" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmBang</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">pm_loc</span> <span class="o" style="font-weight: 600;">:</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;"><span class="idiff left right">desugarLPat</span></span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">p</span></span>
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<pre style="margin: 0;">+<span id="LC495" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">pm_loc</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="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">l</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">p'</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC496" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC496" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (x@pat) ==> <span class="idiff left right">Translate</span> pat with x as match var and handle impedance</span></span>
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<pre style="margin: 0;">+<span id="LC497" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (x@pat) ==> <span class="idiff left right">Desugar</span> pat with x as match var and handle impedance</span></span>
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<pre style="margin: 0;"> <span id="LC498" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- mismatch with incoming match var</span></span>
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<pre style="margin: 0;">-<span id="LC498" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">AsPat</span> <span class="kr" style="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;">y</span><span class="p">)</span> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">mkPmLetVar</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">++</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;"><span class="idiff left">translateLPat</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">fam_insts</span></span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">p</span></span>
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<pre style="margin: 0;">+<span id="LC499" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">AsPat</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">y</span><span class="p">)</span> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">mkPmLetVar</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">++</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;"><span class="idiff left right">desugarLPat</span></span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">p</span></span>
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<pre style="margin: 0;"> <span id="LC500" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC500" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SigPat</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">_ty</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;"><span class="idiff left">translateLPat</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">fam_insts</span></span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">p</span></span>
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<pre style="margin: 0;">+<span id="LC501" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SigPat</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">_ty</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;"><span class="idiff left right">desugarLPat</span></span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">p</span></span>
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<pre style="margin: 0;"> <span id="LC502" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC502" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">Translate</span> CoPats]</span></span>
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<pre style="margin: 0;">+<span id="LC503" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">Desugar</span> CoPats]</span></span>
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<pre style="margin: 0;"> <span id="LC504" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Generally the translation is</span></span>
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<pre style="margin: 0;"> <span id="LC505" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- pat |> co ===> let y = x |> co, pat <- y where y is a match var of pat</span></span>
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<pre style="margin: 0;"> <span id="LC506" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">XPat</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoPat</span> <span class="n" style="color: #333;">wrapper</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC506" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isIdHsWrapper</span> <span class="n" style="color: #333;">wrapper</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;"><span class="idiff left">translatePat</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">fam_insts</span></span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">p</span></span>
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<pre style="margin: 0;">-<span id="LC507" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">WpCast</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">wrapper</span><span class="p">,</span> <span class="n" style="color: #333;">isReflexiveCo</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;"><span class="idiff left">translatePat</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">fam_insts</span></span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">p</span></span>
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<pre style="margin: 0;">+<span id="LC507" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isIdHsWrapper</span> <span class="n" style="color: #333;">wrapper</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;"><span class="idiff left right">desugarPat</span></span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">p</span></span>
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<pre style="margin: 0;">+<span id="LC508" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">WpCast</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">wrapper</span><span class="p">,</span> <span class="n" style="color: #333;">isReflexiveCo</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;"><span class="idiff left right">desugarPat</span></span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">p</span></span>
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<pre style="margin: 0;"> <span id="LC509" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</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="LC509" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">y</span><span class="p">,</span> <span class="n" style="color: #333;">grds</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;"><span class="idiff left">translatePatV</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">fam_insts</span></span> <span class="n" style="color: #333;">p</span></span>
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<pre style="margin: 0;">+<span id="LC510" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">y</span><span class="p">,</span> <span class="n" style="color: #333;">grds</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;"><span class="idiff left right">desugarPatV</span></span> <span class="n" style="color: #333;">p</span></span>
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<pre style="margin: 0;"> <span id="LC511" class="line" lang="haskell"> <span class="n" style="color: #333;">wrap_rhs_y</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsHsWrapper</span> <span class="n" style="color: #333;">wrapper</span></span>
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<pre style="margin: 0;"> <span id="LC512" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmLet</span> <span class="n" style="color: #333;">y</span> <span class="p">(</span><span class="n" style="color: #333;">wrap_rhs_y</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">x</span><span class="p">))</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">grds</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC513" 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">@@ -521,13 +522,13 @@ translatePat fam_insts x pat = case pat of</td>
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<pre style="margin: 0;"> <span id="LC522" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC523" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (fun -> pat) ===> let y = fun x, pat <- y where y is a match var of pat</span></span>
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<pre style="margin: 0;"> <span id="LC524" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ViewPat</span> <span class="n" style="color: #333;">_arg_ty</span> <span class="n" style="color: #333;">lexpr</span> <span class="n" style="color: #333;">pat</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="LC524" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">y</span><span class="p">,</span> <span class="n" style="color: #333;">grds</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;"><span class="idiff left">translateLPatV</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">fam_insts</span></span> <span class="n" style="color: #333;">pat</span></span>
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<pre style="margin: 0;">+<span id="LC525" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">y</span><span class="p">,</span> <span class="n" style="color: #333;">grds</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;"><span class="idiff left right">desugarLPatV</span></span> <span class="n" style="color: #333;">pat</span></span>
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<pre style="margin: 0;"> <span id="LC526" class="line" lang="haskell"> <span class="n" style="color: #333;">fun</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsLExpr</span> <span class="n" style="color: #333;">lexpr</span></span>
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<pre style="margin: 0;"> <span id="LC527" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">PmLet</span> <span class="n" style="color: #333;">y</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">App</span> <span class="n" style="color: #333;">fun</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">x</span><span class="p">))</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">grds</span></span>
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<pre style="margin: 0;"> <span id="LC528" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC529" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- list</span></span>
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<pre style="margin: 0;"> <span id="LC530" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ListPat</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ListPatTc</span> <span class="n" style="color: #333;">_elem_ty</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">)</span> <span class="n" style="color: #333;">ps</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">-<span id="LC530" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">translateListPat</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">fam_insts</span></span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">ps</span></span>
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<pre style="margin: 0;">+<span id="LC531" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left right">desugarListPat</span></span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">ps</span></span>
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<pre style="margin: 0;"> <span id="LC532" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC533" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- overloaded list</span></span>
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<pre style="margin: 0;"> <span id="LC534" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ListPat</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ListPatTc</span> <span class="n" style="color: #333;">elem_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">pat_ty</span><span class="p">,</span> <span class="n" style="color: #333;">to_list</span><span class="p">)))</span> <span class="n" style="color: #333;">pats</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -535,11 +536,11 @@ translatePat fam_insts x pat = case pat of</td>
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<pre style="margin: 0;"> <span id="LC536" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">splitListTyConApp_maybe</span> <span class="n" style="color: #333;">pat_ty</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC537" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">_e_ty</span></span>
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<pre style="margin: 0;"> <span id="LC538" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">xopt</span> <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">RebindableSyntax</span> <span class="n" style="color: #333;">dflags</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC538" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Just <span class="idiff left right">translate</span> it as a regular ListPat</span></span>
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<pre style="margin: 0;">-<span id="LC539" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;"><span class="idiff left">translateListPat</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">fam_insts</span></span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">pats</span></span>
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<pre style="margin: 0;">+<span id="LC539" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Just <span class="idiff left right">desugar</span> it as a regular ListPat</span></span>
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<pre style="margin: 0;">+<span id="LC540" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;"><span class="idiff left right">desugarListPat</span></span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">pats</span></span>
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<pre style="margin: 0;"> <span id="LC541" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;"> <span id="LC542" class="line" lang="haskell"> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkPmId</span> <span class="p">(</span><span class="n" style="color: #333;">mkListTy</span> <span class="n" style="color: #333;">elem_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC542" class="line" lang="haskell"> <span class="n" style="color: #333;">grds</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;"><span class="idiff left">translateListPat</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">fam_insts</span></span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">pats</span></span>
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<pre style="margin: 0;">+<span id="LC543" class="line" lang="haskell"> <span class="n" style="color: #333;">grds</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;"><span class="idiff left right">desugarListPat</span></span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">pats</span></span>
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544
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<pre style="margin: 0;"> <span id="LC544" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_y</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsSyntaxExpr</span> <span class="n" style="color: #333;">to_list</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">x</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC545" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">PmLet</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">rhs_y</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">grds</span></span>
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546
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<pre style="margin: 0;"> <span id="LC546" 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">@@ -565,7 +566,7 @@ translatePat fam_insts x pat = case pat of</td>
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<pre style="margin: 0;"> <span id="LC566" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cpt_dicts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dicts</span></span>
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567
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<pre style="margin: 0;"> <span id="LC567" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC568" class="line" lang="haskell"> <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="LC568" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">translateConPatOut</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">fam_insts</span></span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">arg_tys</span> <span class="n" style="color: #333;">ex_tvs</span> <span class="n" style="color: #333;">dicts</span> <span class="n" style="color: #333;">ps</span></span>
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<pre style="margin: 0;">+<span id="LC569" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left right">desugarConPatOut</span></span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">arg_tys</span> <span class="n" style="color: #333;">ex_tvs</span> <span class="n" style="color: #333;">dicts</span> <span class="n" style="color: #333;">ps</span></span>
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570
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<pre style="margin: 0;"> <span id="LC570" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC571" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NPat</span> <span class="n" style="color: #333;">ty</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;">olit</span><span class="p">)</span> <span class="n" style="color: #333;">mb_neg</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;"> <span id="LC572" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Literal short cut] in "GHC.HsToCore.Match.Literal"</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">@@ -594,46 +595,44 @@ translatePat fam_insts x pat = case pat of</td>
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<pre style="margin: 0;"> <span id="LC595" class="line" lang="haskell"> <span class="n" style="color: #333;">mkPmLitGrds</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">lit</span></span>
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596
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<pre style="margin: 0;"> <span id="LC596" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC597" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TuplePat</span> <span class="n" style="color: #333;">_tys</span> <span class="n" style="color: #333;">pats</span> <span class="n" style="color: #333;">boxity</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="LC597" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">vars</span><span class="p">,</span> <span class="n" style="color: #333;">grdss</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapAndUnzipM</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">translateLPatV</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fam_insts</span></span><span class="p"><span class="idiff right">)</span></span> <span class="n" style="color: #333;">pats</span></span>
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<pre style="margin: 0;">+<span id="LC598" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">vars</span><span class="p">,</span> <span class="n" style="color: #333;">grdss</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapAndUnzipM</span> <span class="n" style="color: #333;"><span class="idiff left right">desugarLPatV</span></span> <span class="n" style="color: #333;">pats</span></span>
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<pre style="margin: 0;"> <span id="LC599" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">tuple_con</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tupleDataCon</span> <span class="n" style="color: #333;">boxity</span> <span class="p">(</span><span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">vars</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC600" 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;">vanillaConGrd</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">tuple_con</span> <span class="n" style="color: #333;">vars</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">concat</span> <span class="n" style="color: #333;">grdss</span></span>
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601
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<pre style="margin: 0;"> <span id="LC601" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC602" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SumPat</span> <span class="n" style="color: #333;">_ty</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">alt</span> <span class="n" style="color: #333;">arity</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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602
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<pre style="margin: 0;">-<span id="LC602" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">y</span><span class="p">,</span> <span class="n" style="color: #333;">grds</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;"><span class="idiff left">translateLPatV</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">fam_insts</span></span> <span class="n" style="color: #333;">p</span></span>
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<pre style="margin: 0;">+<span id="LC603" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">y</span><span class="p">,</span> <span class="n" style="color: #333;">grds</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;"><span class="idiff left right">desugarLPatV</span></span> <span class="n" style="color: #333;">p</span></span>
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603
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604
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<pre style="margin: 0;"> <span id="LC604" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">sum_con</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sumDataCon</span> <span class="n" style="color: #333;">alt</span> <span class="n" style="color: #333;">arity</span></span>
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604
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<pre style="margin: 0;"> <span id="LC605" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Unboxed tuple RuntimeRep vars] in GHC.Core.TyCon</span></span>
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605
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606
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<pre style="margin: 0;"> <span id="LC606" 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;">vanillaConGrd</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">sum_con</span> <span class="p">[</span><span class="n" style="color: #333;">y</span><span class="p">]</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">grds</span></span>
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607
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<pre style="margin: 0;"> <span id="LC607" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC607" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- --------------------------------------------------------------------------</span></span>
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608
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<pre style="margin: 0;">-<span id="LC608" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Not supposed to happen</span></span>
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609
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<pre style="margin: 0;">-<span id="LC609" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SplicePat</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"Check.translatePat: SplicePat"</span></span>
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<pre style="margin: 0;">+<span id="LC608" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SplicePat</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"Check.desugarPat: SplicePat"</span></span>
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610
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609
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<pre style="margin: 0;"> <span id="LC609" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC611" class="line" lang="haskell"><span class="cd">-- | '<span class="idiff left right">translate</span>Pat', but also select and return a new match var.</span></span>
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<pre style="margin: 0;">-<span id="LC612" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">translatePatV</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">FamInstEnvs</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">-></span></span> <span class="kt" style="color: #458; font-weight: 600;">Pat</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <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;">Id</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">GrdVec</span><span class="p">)</span></span>
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613
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<pre style="margin: 0;">-<span id="LC613" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">translatePatV</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">fam_insts</span></span> <span class="n" style="color: #333;">pat</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="LC610" class="line" lang="haskell"><span class="cd">-- | '<span class="idiff left right">desugar</span>Pat', but also select and return a new match var.</span></span>
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<pre style="margin: 0;">+<span id="LC611" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">desugarPatV</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">::</span></span> <span class="kt" style="color: #458; font-weight: 600;">Pat</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <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;">Id</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">GrdVec</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC612" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left right">desugarPatV</span></span> <span class="n" style="color: #333;">pat</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="LC613" class="line" lang="haskell"> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">selectMatchVar</span> <span class="kt" style="color: #458; font-weight: 600;">Many</span> <span class="n" style="color: #333;">pat</span></span>
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<pre style="margin: 0;">-<span id="LC615" class="line" lang="haskell"> <span class="n" style="color: #333;">grds</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;"><span class="idiff left">translatePat</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">fam_insts</span></span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">pat</span></span>
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<pre style="margin: 0;">+<span id="LC614" class="line" lang="haskell"> <span class="n" style="color: #333;">grds</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;"><span class="idiff left right">desugarPat</span></span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">pat</span></span>
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<pre style="margin: 0;"> <span id="LC615" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="n" style="color: #333;">grds</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC616" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC618" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">translateLPat</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">FamInstEnvs</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">-></span></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LPat</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</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;">GrdVec</span></span>
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<pre style="margin: 0;">-<span id="LC619" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">translateLPat</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">x</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">translatePat</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">fam_insts</span></span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">unLoc</span></span>
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<pre style="margin: 0;">+<span id="LC617" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">desugarLPat</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">::</span></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LPat</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</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;">GrdVec</span></span>
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<pre style="margin: 0;">+<span id="LC618" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">desugarLPat</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</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">desugarPat</span></span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">unLoc</span></span>
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<pre style="margin: 0;"> <span id="LC619" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC621" class="line" lang="haskell"><span class="cd">-- | '<span class="idiff left right">translate</span>LPat', but also select and return a new match var.</span></span>
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<pre style="margin: 0;">-<span id="LC622" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">translateLPatV</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">FamInstEnvs</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">-></span></span> <span class="kt" style="color: #458; font-weight: 600;">LPat</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <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;">Id</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">GrdVec</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC623" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">translateLPatV</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="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">translatePatV</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">fam_insts</span></span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">unLoc</span></span>
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<pre style="margin: 0;">+<span id="LC620" class="line" lang="haskell"><span class="cd">-- | '<span class="idiff left right">desugar</span>LPat', but also select and return a new match var.</span></span>
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<pre style="margin: 0;">+<span id="LC621" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">desugarLPatV</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">::</span></span> <span class="kt" style="color: #458; font-weight: 600;">LPat</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <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;">Id</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">GrdVec</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC622" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">desugarLPatV</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">desugarPatV</span></span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">unLoc</span></span>
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<pre style="margin: 0;"> <span id="LC623" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC625" class="line" lang="haskell"><span class="cd">-- | @<span class="idiff left right">translate</span>ListPat _ x [p1, ..., pn]@ is basically</span></span>
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<pre style="margin: 0;">-<span id="LC626" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @<span class="idiff left right">translate</span>ConPatOut _ x $(mkListConPatOuts [p1, ..., pn]>@ without ever</span></span>
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<pre style="margin: 0;">+<span id="LC624" class="line" lang="haskell"><span class="cd">-- | @<span class="idiff left right">desugar</span>ListPat _ x [p1, ..., pn]@ is basically</span></span>
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<pre style="margin: 0;">+<span id="LC625" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @<span class="idiff left right">desugar</span>ConPatOut _ x $(mkListConPatOuts [p1, ..., pn]>@ without ever</span></span>
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<pre style="margin: 0;"> <span id="LC626" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- constructing the 'ConPatOut's.</span></span>
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<pre style="margin: 0;">-<span id="LC628" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">translateListPat</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">FamInstEnvs</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">-></span></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LPat</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;">GrdVec</span></span>
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<pre style="margin: 0;">-<span id="LC629" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">translateListPat</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">fam_insts</span></span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">pats</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="LC630" class="line" lang="haskell"> <span class="n" style="color: #333;">vars_and_grdss</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">traverse</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">translateLPatV</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fam_insts</span></span><span class="p"><span class="idiff right">)</span></span> <span class="n" style="color: #333;">pats</span></span>
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<pre style="margin: 0;">+<span id="LC627" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">desugarListPat</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">::</span></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LPat</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;">GrdVec</span></span>
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<pre style="margin: 0;">+<span id="LC628" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left right">desugarListPat</span></span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">pats</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="LC629" class="line" lang="haskell"> <span class="n" style="color: #333;">vars_and_grdss</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">traverse</span> <span class="n" style="color: #333;"><span class="idiff left right">desugarLPatV</span></span> <span class="n" style="color: #333;">pats</span></span>
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<pre style="margin: 0;"> <span id="LC630" class="line" lang="haskell"> <span class="n" style="color: #333;">mkListGrds</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">vars_and_grdss</span></span>
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<pre style="margin: 0;"> <span id="LC631" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC633" class="line" lang="haskell"><span class="cd">-- | <span class="idiff left right">Translate</span> a constructor pattern</span></span>
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<pre style="margin: 0;">-<span id="LC634" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">translateConPatOut</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">FamInstEnvs</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">-></span></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ConLike</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC632" class="line" lang="haskell"><span class="cd">-- | <span class="idiff left right">Desugar</span> a constructor pattern</span></span>
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<pre style="margin: 0;">+<span id="LC633" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">desugarConPatOut</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">::</span></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ConLike</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC634" 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;">EvVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsConPatDetails</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</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;">GrdVec</span></span>
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<pre style="margin: 0;">-<span id="LC636" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">translateConPatOut</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">fam_insts</span></span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">univ_tys</span> <span class="n" style="color: #333;">ex_tvs</span> <span class="n" style="color: #333;">dicts</span> <span class="o" style="font-weight: 600;">=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;">case</span></span>
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<pre style="margin: 0;">+<span id="LC635" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left right">desugarConPatOut</span></span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">univ_tys</span> <span class="n" style="color: #333;">ex_tvs</span> <span class="n" style="color: #333;">dicts</span> <span class="o" style="font-weight: 600;">=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;">case</span></span>
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<pre style="margin: 0;"> <span id="LC636" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PrefixCon</span> <span class="n" style="color: #333;">ps</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">go_field_pats</span> <span class="p">(</span><span class="n" style="color: #333;">zip</span> <span class="p">[</span><span class="mi" style="color: #099;">0</span><span class="o" style="font-weight: 600;">..</span><span class="p">]</span> <span class="n" style="color: #333;">ps</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC637" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">InfixCon</span> <span class="n" style="color: #333;">p1</span> <span class="n" style="color: #333;">p2</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">go_field_pats</span> <span class="p">(</span><span class="n" style="color: #333;">zip</span> <span class="p">[</span><span class="mi" style="color: #099;">0</span><span class="o" style="font-weight: 600;">..</span><span class="p">]</span> <span class="p">[</span><span class="n" style="color: #333;">p1</span><span class="p">,</span><span class="n" style="color: #333;">p2</span><span class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC638" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">RecCon</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsRecFields</span> <span class="n" style="color: #333;">fs</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;">go_field_pats</span> <span class="p">(</span><span class="n" style="color: #333;">rec_field_ps</span> <span class="n" style="color: #333;">fs</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">@@ -647,7 +646,7 @@ translateConPatOut fam_insts x con univ_tys ex_tvs dicts = \case</td>
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<pre style="margin: 0;"> <span id="LC646" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC647" class="line" lang="haskell"> <span class="n" style="color: #333;">tagged_pat</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">lbl_to_index</span> <span class="p">(</span><span class="n" style="color: #333;">getName</span> <span class="p">(</span><span class="n" style="color: #333;">hsRecFieldId</span> <span class="n" style="color: #333;">f</span><span class="p">)),</span> <span class="n" style="color: #333;">hsRecFieldArg</span> <span class="n" style="color: #333;">f</span><span class="p">)</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;">-- Unfortunately the label info is empty when the DataCon wasn't defined</span></span>
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<pre style="margin: 0;">-<span id="LC650" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- with record field labels, hence we <span class="idiff left right">translate</span> to field index.</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;">-- with record field labels, hence we <span class="idiff left right">desugar</span> to field index.</span></span>
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<pre style="margin: 0;"> <span id="LC650" class="line" lang="haskell"> <span class="n" style="color: #333;">orig_lbls</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">flSelector</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">conLikeFieldLabels</span> <span class="n" style="color: #333;">con</span></span>
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<pre style="margin: 0;"> <span id="LC651" class="line" lang="haskell"> <span class="n" style="color: #333;">lbl_to_index</span> <span class="n" style="color: #333;">lbl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">expectJust</span> <span class="s" style="color: #d14;">"lbl_to_index"</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">elemIndex</span> <span class="n" style="color: #333;">lbl</span> <span class="n" style="color: #333;">orig_lbls</span></span>
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<pre style="margin: 0;"> <span id="LC652" 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">@@ -658,10 +657,10 @@ translateConPatOut fam_insts x con univ_tys ex_tvs dicts = \case</td>
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<pre style="margin: 0;"> <span id="LC657" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the first field of @tagged_pats@.</span></span>
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<pre style="margin: 0;"> <span id="LC658" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Field match order for RecCon]</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="LC661" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">Translate</span> the mentioned field patterns. We're doing this first to get</span></span>
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<pre style="margin: 0;">+<span id="LC660" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">Desugar</span> the mentioned field patterns. We're doing this first to get</span></span>
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<pre style="margin: 0;"> <span id="LC661" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the Ids for pm_con_args.</span></span>
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<pre style="margin: 0;"> <span id="LC662" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">trans_pat</span> <span class="p">(</span><span class="n" style="color: #333;">n</span><span class="p">,</span> <span class="n" style="color: #333;">pat</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="LC664" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">var</span><span class="p">,</span> <span class="n" style="color: #333;">pvec</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;"><span class="idiff left">translateLPatV</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">fam_insts</span></span> <span class="n" style="color: #333;">pat</span></span>
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<pre style="margin: 0;">+<span id="LC663" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">var</span><span class="p">,</span> <span class="n" style="color: #333;">pvec</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;"><span class="idiff left right">desugarLPatV</span></span> <span class="n" style="color: #333;">pat</span></span>
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<pre style="margin: 0;"> <span id="LC664" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">((</span><span class="n" style="color: #333;">n</span><span class="p">,</span> <span class="n" style="color: #333;">var</span><span class="p">),</span> <span class="n" style="color: #333;">pvec</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC665" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">tagged_vars</span><span class="p">,</span> <span class="n" style="color: #333;">arg_grdss</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapAndUnzipM</span> <span class="n" style="color: #333;">trans_pat</span> <span class="n" style="color: #333;">tagged_pats</span></span>
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<pre style="margin: 0;"> <span id="LC666" 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">@@ -687,77 +686,81 @@ translateConPatOut fam_insts x con univ_tys ex_tvs dicts = \case</td>
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<pre style="margin: 0;"> <span id="LC686" 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="LC687" 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="LC688" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC690" 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="LC691" 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="LC692" 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="LC693" 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="LC694" 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="LC695" 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="LC696" 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="LC697" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC698" 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="LC699" 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="LC700" 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="LC701" 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="LC702" 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="LC703" 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;">translateGRHSs</span> <span class="n" style="color: #333;">fam_insts</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 class="n" style="color: #333;">grhss</span></span>
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<pre style="margin: 0;">-<span id="LC704" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- tracePm "translateMatch" (vcat [ppr pats, ppr pats', ppr grhss'])</span></span>
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<pre style="margin: 0;">-<span id="LC705" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">foldr</span> <span class="kt" style="color: #458; font-weight: 600;">Guard</span> <span class="n" style="color: #333;">grhss'</span> <span class="n" style="color: #333;">pats'</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC706" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC707" 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="LC708" 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="LC709" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC710" 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="LC711" 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="LC712" 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="LC713" 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="LC714" 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="LC715" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC716" 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="LC717" 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;">SDoc</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="LC718" 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;">pp_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="LC719" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- _loc points to the match separator (ie =, ->) that comes after the guards..</span></span>
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<pre style="margin: 0;">-<span id="LC720" 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="LC721" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC722" class="line" lang="haskell"> <span class="n" style="color: #333;">loc_sdoc</span></span>
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<pre style="margin: 0;">-<span id="LC723" 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="LC724" 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="LC725" 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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726
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<pre style="margin: 0;">-<span id="LC726" 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="LC727" 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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<pre style="margin: 0;">-<span id="LC728" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC729" class="line" lang="haskell"><span class="cd">-- | Translate a guard statement to a 'GrdVec'</span></span>
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<pre style="margin: 0;">-<span id="LC730" class="line" lang="haskell"><span class="n" style="color: #333;">translateGuard</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;">GuardStmt</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</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;">GrdVec</span></span>
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<pre style="margin: 0;">-<span id="LC731" class="line" lang="haskell"><span class="n" style="color: #333;">translateGuard</span> <span class="n" style="color: #333;">fam_insts</span> <span class="n" style="color: #333;">guard</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">guard</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC732" class="line" lang="haskell"> <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;">translateBoolGuard</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;">-<span id="LC733" class="line" lang="haskell"> <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;">translateLet</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">binds</span><span class="p">)</span></span>
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734
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<pre style="margin: 0;">-<span id="LC734" class="line" lang="haskell"> <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;">p</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">translateBind</span> <span class="n" style="color: #333;">fam_insts</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">e</span></span>
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735
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<pre style="margin: 0;">-<span id="LC735" class="line" lang="haskell"> <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="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"translateGuard LastStmt"</span></span>
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736
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<pre style="margin: 0;">-<span id="LC736" class="line" lang="haskell"> <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="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"translateGuard ParStmt"</span></span>
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737
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<pre style="margin: 0;">-<span id="LC737" class="line" lang="haskell"> <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="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"translateGuard TransStmt"</span></span>
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738
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<pre style="margin: 0;">-<span id="LC738" class="line" lang="haskell"> <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="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"translateGuard RecStmt"</span></span>
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739
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<pre style="margin: 0;">-<span id="LC739" class="line" lang="haskell"> <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="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"translateGuard ApplicativeLastStmt"</span></span>
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740
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<pre style="margin: 0;">-<span id="LC740" class="line" lang="haskell"></span>
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741
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<pre style="margin: 0;">-<span id="LC741" class="line" lang="haskell"><span class="cd">-- | Translate let-bindings</span></span>
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742
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<pre style="margin: 0;">-<span id="LC742" class="line" lang="haskell"><span class="n" style="color: #333;">translateLet</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsLocalBinds</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</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;">GrdVec</span></span>
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<pre style="margin: 0;">-<span id="LC743" class="line" lang="haskell"><span class="n" style="color: #333;">translateLet</span> <span class="n" style="color: #333;">_binds</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="LC744" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC745" class="line" lang="haskell"><span class="cd">-- | Translate a pattern guard</span></span>
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<pre style="margin: 0;">+<span id="LC689" class="line" lang="haskell"><span class="n" style="color: #333;">desugarPatBind</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;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Pat</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <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;">PmPatBind</span> <span class="kt" style="color: #458; font-weight: 600;">Pre</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC690" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See 'GrdPatBind' for how this simply repurposes GrdGRHS.</span></span>
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<pre style="margin: 0;">+<span id="LC691" class="line" lang="haskell"><span class="n" style="color: #333;">desugarPatBind</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">var</span> <span class="n" style="color: #333;">pat</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC692" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmPatBind</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">flip</span> <span class="kt" style="color: #458; font-weight: 600;">PmGRHS</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="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">pat</span><span class="p">))</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">desugarPat</span> <span class="n" style="color: #333;">var</span> <span class="n" style="color: #333;">pat</span></span>
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<pre style="margin: 0;">+<span id="LC693" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC694" class="line" lang="haskell"><span class="n" style="color: #333;">desugarEmptyCase</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">PmEmptyCase</span></span>
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<pre style="margin: 0;">+<span id="LC695" class="line" lang="haskell"><span class="n" style="color: #333;">desugarEmptyCase</span> <span class="n" style="color: #333;">var</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;">PmEmptyCase</span> <span class="p">{</span> <span class="n" style="color: #333;">pe_var</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">var</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC696" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC697" class="line" lang="haskell"><span class="cd">-- | Desugar the non-empty 'Match'es of a 'MatchGroup'.</span></span>
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<pre style="margin: 0;">+<span id="LC698" class="line" lang="haskell"><span class="n" style="color: #333;">desugarMatches</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;">NonEmpty</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="LC699" 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;">PmMatchGroup</span> <span class="kt" style="color: #458; font-weight: 600;">Pre</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC700" class="line" lang="haskell"><span class="n" style="color: #333;">desugarMatches</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="LC701" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmMatchGroup</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;">desugarMatch</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="LC702" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC703" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Desugar a single match</span></span>
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<pre style="margin: 0;">+<span id="LC704" class="line" lang="haskell"><span class="n" style="color: #333;">desugarMatch</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 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;">PmMatch</span> <span class="kt" style="color: #458; font-weight: 600;">Pre</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC705" class="line" lang="haskell"><span class="n" style="color: #333;">desugarMatch</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="LC706" 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="n" style="color: #333;">desugarLPat</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="LC707" 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;">desugarGRHSs</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 class="n" style="color: #333;">grhss</span></span>
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<pre style="margin: 0;">+<span id="LC708" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- tracePm "desugarMatch" (vcat [ppr pats, ppr pats', ppr grhss'])</span></span>
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<pre style="margin: 0;">+<span id="LC709" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">PmMatch</span> <span class="p">{</span> <span class="n" style="color: #333;">pm_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;">pm_grhss</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">grhss'</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC710" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC711" class="line" lang="haskell"><span class="n" style="color: #333;">desugarGRHSs</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="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmGRHS</span> <span class="kt" style="color: #458; font-weight: 600;">Pre</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC712" class="line" lang="haskell"><span class="n" style="color: #333;">desugarGRHSs</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>
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<pre style="margin: 0;">+<span id="LC713" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">traverse</span> <span class="p">(</span><span class="n" style="color: #333;">desugarLGRHS</span> <span class="n" style="color: #333;">match_loc</span> <span class="n" style="color: #333;">pp_pats</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC714" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">expectJust</span> <span class="s" style="color: #d14;">"desugarGRHSs"</span></span>
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<pre style="margin: 0;">+<span id="LC715" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">NE</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">nonEmpty</span></span>
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<pre style="margin: 0;">+<span id="LC716" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">grhssGRHSs</span> <span class="n" style="color: #333;">grhss</span></span>
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<pre style="margin: 0;">+<span id="LC717" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC718" class="line" lang="haskell"><span class="cd">-- | Desugar a guarded right-hand side to a single 'GrdTree'</span></span>
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<pre style="margin: 0;">+<span id="LC719" class="line" lang="haskell"><span class="n" style="color: #333;">desugarLGRHS</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;">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="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmGRHS</span> <span class="kt" style="color: #458; font-weight: 600;">Pre</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC720" class="line" lang="haskell"><span class="n" style="color: #333;">desugarLGRHS</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="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 class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC721" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- _loc points to the match separator (ie =, ->) that comes after the guards.</span></span>
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<pre style="margin: 0;">+<span id="LC722" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Hence we have to pass in the match_loc, which we use in case that the RHS</span></span>
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<pre style="margin: 0;">+<span id="LC723" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- is unguarded.</span></span>
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<pre style="margin: 0;">+<span id="LC724" 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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725
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<pre style="margin: 0;">+<span id="LC725" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- GRHS belongs to, so the @A B x@ part in @A B x | 0 <- x@.</span></span>
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726
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<pre style="margin: 0;">+<span id="LC726" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">rhs_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">gs</span> <span class="kr" style="font-weight: 600;">of</span></span>
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727
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<pre style="margin: 0;">+<span id="LC727" class="line" lang="haskell"> <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;">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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728
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<pre style="margin: 0;">+<span id="LC728" class="line" lang="haskell"> <span class="p">(</span><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="p">)</span><span class="o" style="font-weight: 600;">:</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">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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729
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<pre style="margin: 0;">+<span id="LC729" class="line" lang="haskell"> <span class="n" style="color: #333;">grds</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;">desugarGuard</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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730
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<pre style="margin: 0;">+<span id="LC730" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">PmGRHS</span> <span class="p">{</span> <span class="n" style="color: #333;">pg_grds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">grds</span><span class="p">,</span> <span class="n" style="color: #333;">pg_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs_info</span> <span class="p">}</span></span>
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731
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<pre style="margin: 0;">+<span id="LC731" class="line" lang="haskell"></span>
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732
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<pre style="margin: 0;">+<span id="LC732" class="line" lang="haskell"><span class="cd">-- | Desugar a guard statement to a 'GrdVec'</span></span>
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733
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<pre style="margin: 0;">+<span id="LC733" class="line" lang="haskell"><span class="n" style="color: #333;">desugarGuard</span> <span class="o" style="font-weight: 600;">::</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="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;">GrdVec</span></span>
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734
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<pre style="margin: 0;">+<span id="LC734" class="line" lang="haskell"><span class="n" style="color: #333;">desugarGuard</span> <span class="n" style="color: #333;">guard</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">guard</span> <span class="kr" style="font-weight: 600;">of</span></span>
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735
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<pre style="margin: 0;">+<span id="LC735" class="line" lang="haskell"> <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;">desugarBoolGuard</span> <span class="n" style="color: #333;">e</span></span>
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736
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<pre style="margin: 0;">+<span id="LC736" class="line" lang="haskell"> <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;">desugarLet</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">binds</span><span class="p">)</span></span>
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737
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<pre style="margin: 0;">+<span id="LC737" class="line" lang="haskell"> <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;">p</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">desugarBind</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">e</span></span>
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<td class="diff-line-num new new_line" data-linenumber="738" 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">
738
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<pre style="margin: 0;">+<span id="LC738" class="line" lang="haskell"> <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="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"desugarGuard LastStmt"</span></span>
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<td class="diff-line-num new new_line" data-linenumber="739" 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">
739
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<pre style="margin: 0;">+<span id="LC739" class="line" lang="haskell"> <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="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"desugarGuard ParStmt"</span></span>
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<td class="diff-line-num new new_line" data-linenumber="740" 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">
740
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<pre style="margin: 0;">+<span id="LC740" class="line" lang="haskell"> <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="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"desugarGuard TransStmt"</span></span>
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<td class="diff-line-num new new_line" data-linenumber="741" 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">
741
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<pre style="margin: 0;">+<span id="LC741" class="line" lang="haskell"> <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="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"desugarGuard RecStmt"</span></span>
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<td class="diff-line-num new new_line" data-linenumber="742" 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">
742
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<pre style="margin: 0;">+<span id="LC742" class="line" lang="haskell"> <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="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"desugarGuard ApplicativeLastStmt"</span></span>
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743
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<pre style="margin: 0;">+<span id="LC743" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC744" class="line" lang="haskell"><span class="cd">-- | Desugar let-bindings</span></span>
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<pre style="margin: 0;">+<span id="LC745" class="line" lang="haskell"><span class="n" style="color: #333;">desugarLet</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsLocalBinds</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</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;">GrdVec</span></span>
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<pre style="margin: 0;">+<span id="LC746" class="line" lang="haskell"><span class="n" style="color: #333;">desugarLet</span> <span class="n" style="color: #333;">_binds</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="LC747" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC748" class="line" lang="haskell"><span class="cd">-- | Desugar a pattern guard</span></span>
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<pre style="margin: 0;"> <span id="LC749" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @pat <- e ==> let x = e; <guards for pat <- x>@</span></span>
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<pre style="margin: 0;">-<span id="LC747" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">translateBind</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">FamInstEnvs</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">-></span></span> <span class="kt" style="color: #458; font-weight: 600;">LPat</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <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="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;">GrdVec</span></span>
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<pre style="margin: 0;">-<span id="LC748" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">translateBind</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">fam_insts</span></span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dsLExpr</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;">case</span></span>
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<pre style="margin: 0;">+<span id="LC750" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">desugarBind</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">::</span></span> <span class="kt" style="color: #458; font-weight: 600;">LPat</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <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="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;">GrdVec</span></span>
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<pre style="margin: 0;">+<span id="LC751" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left right">desugarBind</span></span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dsLExpr</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;">case</span></span>
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<pre style="margin: 0;"> <span id="LC752" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">y</span></span>
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<pre style="margin: 0;"> <span id="LC753" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <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;">isDataConId_maybe</span> <span class="n" style="color: #333;">y</span></span>
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<pre style="margin: 0;"> <span id="LC754" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- RHS is a variable, so that will allow us to omit the let</span></span>
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<pre style="margin: 0;">-<span id="LC752" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;"><span class="idiff left">translateLPat</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">fam_insts</span></span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">p</span></span>
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<pre style="margin: 0;">+<span id="LC755" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;"><span class="idiff left right">desugarLPat</span></span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">p</span></span>
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<pre style="margin: 0;"> <span id="LC756" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs</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="LC754" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="n" style="color: #333;">grds</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;"><span class="idiff left">translateLPatV</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">fam_insts</span></span> <span class="n" style="color: #333;">p</span></span>
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<pre style="margin: 0;">+<span id="LC757" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="n" style="color: #333;">grds</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;"><span class="idiff left right">desugarLPatV</span></span> <span class="n" style="color: #333;">p</span></span>
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<pre style="margin: 0;"> <span id="LC758" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmLet</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">rhs</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">grds</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC759" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC757" class="line" lang="haskell"><span class="cd">-- | <span class="idiff left right">Translate</span> a boolean guard</span></span>
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<pre style="margin: 0;">+<span id="LC760" class="line" lang="haskell"><span class="cd">-- | <span class="idiff left right">Desugar</span> a boolean guard</span></span>
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<pre style="margin: 0;"> <span id="LC761" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @e ==> let x = e; True <- x@</span></span>
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<pre style="margin: 0;">-<span id="LC759" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left right">translate</span>BoolGuard</span> <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="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;">GrdVec</span></span>
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<pre style="margin: 0;">-<span id="LC760" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left right">translate</span>BoolGuard</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;">+<span id="LC762" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left right">desugar</span>BoolGuard</span> <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="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;">GrdVec</span></span>
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<pre style="margin: 0;">+<span id="LC763" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left right">desugar</span>BoolGuard</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;"> <span id="LC764" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isJust</span> <span class="p">(</span><span class="n" style="color: #333;">isTrueLHsExpr</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;">return</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;"> <span id="LC765" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The formal thing to do would be to generate (True <- True)</span></span>
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<pre style="margin: 0;"> <span id="LC766" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- but it is trivial to solve so instead we give back an empty</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">@@ -802,7 +805,7 @@ for a pattern match appear matter. Consider a situation similar to T5117:</td>
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<pre style="margin: 0;"> <span id="LC805" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f (0:_) = ()</span></span>
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<pre style="margin: 0;"> <span id="LC806" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f (0:[]) = ()</span></span>
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<pre style="margin: 0;"> <span id="LC807" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC805" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The latter clause is clearly redundant. Yet if we <span class="idiff left right">translate</span> the second clause as</span></span>
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<pre style="margin: 0;">+<span id="LC808" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The latter clause is clearly redundant. Yet if we <span class="idiff left right">desugar</span> the second clause as</span></span>
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<pre style="margin: 0;"> <span id="LC809" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC810" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [x:xs' <- xs, [] <- xs', 0 <- x]</span></span>
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<pre style="margin: 0;"> <span id="LC811" 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">@@ -814,52 +817,11 @@ translation would have been</td>
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<pre style="margin: 0;"> <span id="LC817" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC818" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">And we have to take in the guards on list cells into @mkListGrds@.</span></span>
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<pre style="margin: 0;"> <span id="LC819" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC817" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Countering exponential blowup]</span></span>
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<pre style="margin: 0;">-<span id="LC818" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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819
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<pre style="margin: 0;">-<span id="LC819" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Precise pattern match exhaustiveness checking is necessarily exponential in</span></span>
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820
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<pre style="margin: 0;">-<span id="LC820" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the size of some input programs. We implement a counter-measure in the form of</span></span>
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821
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<pre style="margin: 0;">-<span id="LC821" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the -fmax-pmcheck-models flag, limiting the number of Deltas we check against</span></span>
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822
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<pre style="margin: 0;">-<span id="LC822" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">each pattern by a constant.</span></span>
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823
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<pre style="margin: 0;">-<span id="LC823" class="line" lang="haskell"></span>
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824
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<pre style="margin: 0;">-<span id="LC824" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">How do we do that? Consider</span></span>
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825
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<pre style="margin: 0;">-<span id="LC825" class="line" lang="haskell"></span>
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826
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<pre style="margin: 0;">-<span id="LC826" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f True True = ()</span></span>
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827
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<pre style="margin: 0;">-<span id="LC827" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f True True = ()</span></span>
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828
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<pre style="margin: 0;">-<span id="LC828" class="line" lang="haskell"></span>
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829
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<pre style="margin: 0;">-<span id="LC829" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">And imagine we set our limit to 1 for the sake of the example. The first clause</span></span>
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830
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<pre style="margin: 0;">-<span id="LC830" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">will be checked against the initial Delta, {}. Doing so will produce an</span></span>
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831
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<pre style="margin: 0;">-<span id="LC831" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Uncovered set of size 2, containing the models {x/~True} and {x~True,y/~True}.</span></span>
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832
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<pre style="margin: 0;">-<span id="LC832" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Also we find the first clause to cover the model {x~True,y~True}.</span></span>
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833
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<pre style="margin: 0;">-<span id="LC833" class="line" lang="haskell"></span>
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834
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<pre style="margin: 0;">-<span id="LC834" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But the Uncovered set we get out of the match is too huge! We somehow have to</span></span>
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835
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<pre style="margin: 0;">-<span id="LC835" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">ensure not to make things worse as they are already, so we continue checking</span></span>
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836
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<pre style="margin: 0;">-<span id="LC836" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with a singleton Uncovered set of the initial Delta {}. Why is this</span></span>
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837
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<pre style="margin: 0;">-<span id="LC837" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">sound (wrt. notion of the GADTs Meet their Match paper)? Well, it basically</span></span>
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838
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<pre style="margin: 0;">-<span id="LC838" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">amounts to forgetting that we matched against the first clause. The values</span></span>
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839
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<pre style="margin: 0;">-<span id="LC839" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">represented by {} are a superset of those represented by its two refinements</span></span>
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840
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<pre style="margin: 0;">-<span id="LC840" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{x/~True} and {x~True,y/~True}.</span></span>
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841
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<pre style="margin: 0;">-<span id="LC841" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC842" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This forgetfulness becomes very apparent in the example above: By continuing</span></span>
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<pre style="margin: 0;">-<span id="LC843" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with {} we don't detect the second clause as redundant, as it again covers the</span></span>
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<pre style="margin: 0;">-<span id="LC844" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">same non-empty subset of {}. So we don't flag everything as redundant anymore,</span></span>
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<pre style="margin: 0;">-<span id="LC845" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">but still will never flag something as redundant that isn't.</span></span>
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<pre style="margin: 0;">-<span id="LC846" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC847" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For exhaustivity, the converse applies: We will report @f@ as non-exhaustive</span></span>
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<pre style="margin: 0;">-<span id="LC848" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and report @f _ _@ as missing, which is a superset of the actual missing</span></span>
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<pre style="margin: 0;">-<span id="LC849" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">matches. But soundness means we will never fail to report a missing match.</span></span>
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<pre style="margin: 0;">-<span id="LC850" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC851" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This mechanism is implemented in 'throttle'.</span></span>
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<pre style="margin: 0;">-<span id="LC852" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC853" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Guards are an extreme example in this regard, with #11195 being a particularly</span></span>
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<pre style="margin: 0;">-<span id="LC854" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">dreadful example: Since their RHS are often pretty much unique, we split on a</span></span>
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<pre style="margin: 0;">-<span id="LC855" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">variable (the one representing the RHS) that doesn't occur anywhere else in the</span></span>
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<pre style="margin: 0;">-<span id="LC856" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">program, so we don't actually get useful information out of that split!</span></span>
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<pre style="margin: 0;">-<span id="LC857" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC858" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Translate CoPats]</span></span>
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<pre style="margin: 0;">+<span id="LC820" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Desugar CoPats]</span></span>
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<pre style="margin: 0;"> <span id="LC821" 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="LC860" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The pattern match checker did not know how to handle coerced patterns<span class="idiff left right"> `CoPat`</span></span></span>
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<pre style="margin: 0;">-<span id="LC861" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">efficiently, which gave rise to #11276. The original approach translated</span></span></span>
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<pre style="margin: 0;">-<span id="LC862" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">`CoPat`s:</span></span>
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<pre style="margin: 0;">+<span id="LC822" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The pattern match checker did not know how to handle coerced patterns</span></span>
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<pre style="margin: 0;">+<span id="LC823" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">`CoPat` efficiently, which gave rise to #11276. The original approach</span></span></span>
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<pre style="margin: 0;">+<span id="LC824" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">desugared </span>`CoPat`s:</span></span>
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<pre style="margin: 0;"> <span id="LC825" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC826" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> pat |> co ===> x (pat <- (x |> co))</span></span>
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827
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<pre style="margin: 0;"> <span id="LC827" 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">@@ -874,108 +836,92 @@ a lot of false warnings.</td>
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<pre style="margin: 0;"> <span id="LC836" class="line" lang="haskell"></span>
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875
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837
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<pre style="margin: 0;"> <span id="LC837" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But we can check whether the coercion is a hole or if it is just refl, in</span></span>
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876
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838
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<pre style="margin: 0;"> <span id="LC838" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">which case we can drop it.</span></span>
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877
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<pre style="margin: 0;">-<span id="LC877" class="line" lang="haskell"></span>
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878
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<pre style="margin: 0;">-<span id="LC878" 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="LC879" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">%* *</span></span>
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880
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<pre style="margin: 0;">-<span id="LC880" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Utilities for Pattern Match Checking</span></span>
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881
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<pre style="margin: 0;">-<span id="LC881" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">%* *</span></span>
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882
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<pre style="margin: 0;">-<span id="LC882" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">%************************************************************************</span></span>
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883
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839
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<pre style="margin: 0;"> <span id="LC839" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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884
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840
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<pre style="margin: 0;"> <span id="LC840" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC885" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ----------------------------------------------------------------------------</span></span>
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886
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<pre style="margin: 0;">-<span id="LC886" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Basic utilities</span></span>
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887
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<pre style="margin: 0;">-<span id="LC887" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC888" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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889
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<pre style="margin: 0;">-<span id="LC889" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Extensions to GADTs Meet Their Match]</span></span>
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890
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<pre style="margin: 0;">-<span id="LC890" 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="LC891" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The GADTs Meet Their Match paper presents the formalism that GHC's coverage</span></span>
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892
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<pre style="margin: 0;">-<span id="LC892" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">checker adheres to. Since the paper's publication, there have been some</span></span>
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893
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<pre style="margin: 0;">-<span id="LC893" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">additional features added to the coverage checker which are not described in</span></span>
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894
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<pre style="margin: 0;">-<span id="LC894" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the paper. This Note serves as a reference for these new features.</span></span>
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895
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<pre style="margin: 0;">-<span id="LC895" class="line" lang="haskell"></span>
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896
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<pre style="margin: 0;">-<span id="LC896" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Value abstractions are severely simplified to the point where they are just</span></span>
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897
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<pre style="margin: 0;">-<span id="LC897" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> variables. The information about the shape of a variable is encoded in</span></span>
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<td class="diff-line-num old old_line" data-linenumber="898" 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">
898
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<pre style="margin: 0;">-<span id="LC898" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the oracle state 'Delta' instead.</span></span>
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899
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<pre style="margin: 0;">-<span id="LC899" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Handling of uninhabited fields like `!Void`.</span></span>
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900
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<pre style="margin: 0;">-<span id="LC900" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> See Note [Strict argument type constraints] in GHC.HsToCore.PmCheck.Oracle.</span></span>
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901
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<pre style="margin: 0;">-<span id="LC901" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Efficient handling of literal splitting, large enumerations and accurate</span></span>
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902
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<pre style="margin: 0;">-<span id="LC902" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> redundancy warnings for `COMPLETE` groups through the oracle.</span></span>
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903
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<pre style="margin: 0;">-<span id="LC903" class="line" lang="haskell"></span>
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904
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<pre style="margin: 0;">-<span id="LC904" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Filtering out non-matching COMPLETE sets]</span></span>
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905
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<pre style="margin: 0;">-<span id="LC905" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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906
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<pre style="margin: 0;">-<span id="LC906" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Currently, conlikes in a COMPLETE set are simply grouped by the</span></span>
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907
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<pre style="margin: 0;">-<span id="LC907" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">type constructor heading the return type. This is nice and simple, but it does</span></span>
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908
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<pre style="margin: 0;">-<span id="LC908" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">mean that there are scenarios when a COMPLETE set might be incompatible with</span></span>
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909
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<pre style="margin: 0;">-<span id="LC909" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the type of a scrutinee. For instance, consider (from #14135):</span></span>
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910
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<pre style="margin: 0;">-<span id="LC910" class="line" lang="haskell"></span>
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911
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<pre style="margin: 0;">-<span id="LC911" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data Foo a = Foo1 a | Foo2 a</span></span>
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912
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<pre style="margin: 0;">-<span id="LC912" class="line" lang="haskell"></span>
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913
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<pre style="margin: 0;">-<span id="LC913" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> pattern MyFoo2 :: Int -> Foo Int</span></span>
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914
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<pre style="margin: 0;">-<span id="LC914" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> pattern MyFoo2 i = Foo2 i</span></span>
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915
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<pre style="margin: 0;">-<span id="LC915" class="line" lang="haskell"></span>
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916
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<pre style="margin: 0;">-<span id="LC916" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> {-# COMPLETE Foo1, MyFoo2 #-}</span></span>
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917
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<pre style="margin: 0;">-<span id="LC917" class="line" lang="haskell"></span>
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<td class="diff-line-num old old_line" data-linenumber="918" 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">
918
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<pre style="margin: 0;">-<span id="LC918" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: Foo a -> a</span></span>
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919
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<pre style="margin: 0;">-<span id="LC919" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f (Foo1 x) = x</span></span>
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920
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<pre style="margin: 0;">-<span id="LC920" class="line" lang="haskell"></span>
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921
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<td class="diff-line-num new_line old" data-linenumber="841" 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="LC921" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">`f` has an incomplete pattern-match, so when choosing which constructors to</span></span>
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922
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<pre style="margin: 0;">-<span id="LC922" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">report as unmatched in a warning, GHC must choose between the original set of</span></span>
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923
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<pre style="margin: 0;">-<span id="LC923" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">data constructors {Foo1, Foo2} and the COMPLETE set {Foo1, MyFoo2}. But observe</span></span>
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924
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<td class="diff-line-num new_line old" data-linenumber="841" 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="LC924" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that GHC shouldn't even consider the COMPLETE set as a possibility: the return</span></span>
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925
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<pre style="margin: 0;">-<span id="LC925" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">type of MyFoo2, Foo Int, does not match the type of the scrutinee, Foo a, since</span></span>
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926
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<pre style="margin: 0;">-<span id="LC926" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">there's no substitution `s` such that s(Foo Int) = Foo a.</span></span>
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927
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<pre style="margin: 0;">-<span id="LC927" class="line" lang="haskell"></span>
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928
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<pre style="margin: 0;">-<span id="LC928" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">To ensure that GHC doesn't pick this COMPLETE set, it checks each pattern</span></span>
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929
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<pre style="margin: 0;">-<span id="LC929" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">synonym constructor's return type matches the type of the scrutinee, and if one</span></span>
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930
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<pre style="margin: 0;">-<span id="LC930" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">doesn't, then we remove the whole COMPLETE set from consideration.</span></span>
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931
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<pre style="margin: 0;">-<span id="LC931" class="line" lang="haskell"></span>
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932
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<pre style="margin: 0;">-<span id="LC932" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">One might wonder why GHC only checks /pattern synonym/ constructors, and not</span></span>
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933
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<pre style="margin: 0;">-<span id="LC933" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">/data/ constructors as well. The reason is because that the type of a</span></span>
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934
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<pre style="margin: 0;">-<span id="LC934" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GADT constructor very well may not match the type of a scrutinee, and that's</span></span>
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935
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<pre style="margin: 0;">-<span id="LC935" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">OK. Consider this example (from #14059):</span></span>
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936
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<pre style="margin: 0;">-<span id="LC936" class="line" lang="haskell"></span>
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937
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<td class="diff-line-num new_line old" data-linenumber="841" 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="LC937" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data SBool (z :: Bool) where</span></span>
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938
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<td class="diff-line-num new_line old" data-linenumber="841" 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="LC938" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> SFalse :: SBool False</span></span>
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939
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<td class="diff-line-num new_line old" data-linenumber="841" 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="LC939" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> STrue :: SBool True</span></span>
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940
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<pre style="margin: 0;">-<span id="LC940" class="line" lang="haskell"></span>
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941
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<td class="diff-line-num new_line old" data-linenumber="841" 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="LC941" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> pattern STooGoodToBeTrue :: forall (z :: Bool). ()</span></span>
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<td class="diff-line-num old old_line" data-linenumber="942" 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">
942
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<td class="diff-line-num new_line old" data-linenumber="841" 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="LC942" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> => z ~ True</span></span>
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943
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<pre style="margin: 0;">-<span id="LC943" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> => SBool z</span></span>
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944
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<pre style="margin: 0;">-<span id="LC944" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> pattern STooGoodToBeTrue = STrue</span></span>
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<pre style="margin: 0;">-<span id="LC945" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> {-# COMPLETE SFalse, STooGoodToBeTrue #-}</span></span>
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<pre style="margin: 0;">-<span id="LC946" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC947" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> wobble :: SBool z -> Bool</span></span>
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<pre style="margin: 0;">-<span id="LC948" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> wobble STooGoodToBeTrue = True</span></span>
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<pre style="margin: 0;">-<span id="LC949" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC950" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In the incomplete pattern match for `wobble`, we /do/ want to warn that SFalse</span></span>
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<pre style="margin: 0;">-<span id="LC951" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">should be matched against, even though its type, SBool False, does not match</span></span>
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952
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<pre style="margin: 0;">-<span id="LC952" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the scrutinee type, SBool z.</span></span>
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<pre style="margin: 0;">-<span id="LC953" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC954" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">SG: Another angle at this is that the implied constraints when we instantiate</span></span>
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<pre style="margin: 0;">-<span id="LC955" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">universal type variables in the return type of a GADT will lead to *provided*</span></span>
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<pre style="margin: 0;">-<span id="LC956" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">thetas, whereas when we instantiate the return type of a pattern synonym that</span></span>
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<pre style="margin: 0;">-<span id="LC957" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">corresponds to a *required* theta. See Note [Pattern synonym result type] in</span></span>
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<pre style="margin: 0;">-<span id="LC958" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">PatSyn. Note how isValidCompleteMatches will successfully filter out</span></span>
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<pre style="margin: 0;">-<span id="LC959" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC960" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> pattern Just42 :: Maybe Int</span></span>
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<pre style="margin: 0;">-<span id="LC961" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> pattern Just42 = Just 42</span></span>
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<pre style="margin: 0;">-<span id="LC962" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC963" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But fail to filter out the equivalent</span></span>
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964
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<pre style="margin: 0;">-<span id="LC964" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC965" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> pattern Just'42 :: (a ~ Int) => Maybe a</span></span>
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966
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<pre style="margin: 0;">-<span id="LC966" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> pattern Just'42 = Just 42</span></span>
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967
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<pre style="margin: 0;">-<span id="LC967" class="line" lang="haskell"></span>
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968
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<pre style="margin: 0;">-<span id="LC968" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Which seems fine as far as tcMatchTy is concerned, but it raises a few eye</span></span>
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<pre style="margin: 0;">-<span id="LC969" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">brows.</span></span>
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<pre style="margin: 0;">-<span id="LC970" 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="LC841" 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="LC842" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Coverage checking guard trees into annotated trees</span></span>
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<pre style="margin: 0;">+<span id="LC843" 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="LC844" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC972" 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="LC973" 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="LC974" 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="LC975" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Heart of the algorithm: checkGrdTree</span></span>
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<pre style="margin: 0;">-<span id="LC976" 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="LC977" 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="LC978" 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="LC845" class="line" lang="haskell"><span class="cd">-- | Pattern-match coverage check result</span></span>
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<pre style="margin: 0;">+<span id="LC846" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">CheckResult</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC847" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CheckResult</span></span>
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<pre style="margin: 0;">+<span id="LC848" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">cr_ret</span> <span class="o" style="font-weight: 600;">::</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="LC849" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ A hole for redundancy info and covered sets.</span></span>
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<pre style="margin: 0;">+<span id="LC850" 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="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">Deltas</span></span>
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<pre style="margin: 0;">+<span id="LC851" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ The set of uncovered values falling out at the bottom.</span></span>
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<pre style="margin: 0;">+<span id="LC852" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (for -Wincomplete-patterns, but also important state for the algorithm)</span></span>
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853
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<pre style="margin: 0;">+<span id="LC853" 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="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">Precision</span></span>
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<pre style="margin: 0;">+<span id="LC854" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ A flag saying whether we ran into the 'maxPmCheckModels' limit for the</span></span>
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<pre style="margin: 0;">+<span id="LC855" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- purpose of suggesting to crank it up in the warning message. Writer state.</span></span>
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856
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<pre style="margin: 0;">+<span id="LC856" class="line" lang="haskell"> <span class="p">}</span> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Functor</span></span>
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857
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<pre style="margin: 0;">+<span id="LC857" class="line" lang="haskell"></span>
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858
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<pre style="margin: 0;">+<span id="LC858" 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="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CheckResult</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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859
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<pre style="margin: 0;">+<span id="LC859" 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;">CheckResult</span> <span class="n" style="color: #333;">c</span> <span class="n" style="color: #333;">unc</span> <span class="n" style="color: #333;">pc</span><span class="p">)</span></span>
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860
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<pre style="margin: 0;">+<span id="LC860" 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;">"CheckResult"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr_precision</span> <span class="n" style="color: #333;">pc</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;">fsep</span></span>
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861
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<pre style="margin: 0;">+<span id="LC861" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">field</span> <span class="s" style="color: #d14;">"ret"</span> <span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">comma</span></span>
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862
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<pre style="margin: 0;">+<span id="LC862" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">field</span> <span class="s" style="color: #d14;">"uncov"</span> <span class="n" style="color: #333;">unc</span><span class="p">])</span></span>
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863
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<pre style="margin: 0;">+<span id="LC863" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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864
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<pre style="margin: 0;">+<span id="LC864" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr_precision</span> <span class="kt" style="color: #458; font-weight: 600;">Precise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">empty</span></span>
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865
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<pre style="margin: 0;">+<span id="LC865" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr_precision</span> <span class="kt" style="color: #458; font-weight: 600;">Approximate</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"(Approximate)"</span></span>
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866
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<pre style="margin: 0;">+<span id="LC866" class="line" lang="haskell"> <span class="n" style="color: #333;">field</span> <span class="n" style="color: #333;">name</span> <span class="n" style="color: #333;">value</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">equals</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">value</span></span>
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867
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<pre style="margin: 0;">+<span id="LC867" class="line" lang="haskell"></span>
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868
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<pre style="margin: 0;">+<span id="LC868" class="line" lang="haskell"><span class="cd">-- | Lift 'addPmCts' over 'Deltas'.</span></span>
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869
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<pre style="margin: 0;">+<span id="LC869" 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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870
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<pre style="margin: 0;">+<span id="LC870" class="line" lang="haskell"><span class="n" style="color: #333;">addPmCtsDeltas</span> <span class="n" style="color: #333;">deltas</span> <span class="n" style="color: #333;">cts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">liftDeltasM</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">d</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addPmCts</span> <span class="n" style="color: #333;">d</span> <span class="n" style="color: #333;">cts</span><span class="p">)</span> <span class="n" style="color: #333;">deltas</span></span>
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871
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<pre style="margin: 0;">+<span id="LC871" class="line" lang="haskell"></span>
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872
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<pre style="margin: 0;">+<span id="LC872" class="line" lang="haskell"><span class="cd">-- | 'addPmCtsDeltas' for a single 'PmCt'.</span></span>
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873
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<pre style="margin: 0;">+<span id="LC873" class="line" lang="haskell"><span class="n" style="color: #333;">addPmCtDeltas</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;">PmCt</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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874
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<pre style="margin: 0;">+<span id="LC874" class="line" lang="haskell"><span class="n" style="color: #333;">addPmCtDeltas</span> <span class="n" style="color: #333;">deltas</span> <span class="n" style="color: #333;">ct</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="p">(</span><span class="n" style="color: #333;">unitBag</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span></span>
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875
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<pre style="margin: 0;">+<span id="LC875" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC876" class="line" lang="haskell"><span class="cd">-- | Test if any of the 'Delta's is inhabited. Currently this is pure, because</span></span>
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<pre style="margin: 0;">+<span id="LC877" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- we preserve the invariant that there are no uninhabited 'Delta's. But that</span></span>
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<pre style="margin: 0;">+<span id="LC878" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- could change in the future, for example by implementing this function in</span></span>
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<pre style="margin: 0;">+<span id="LC879" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- terms of @notNull <$> provideEvidence 1 ds@.</span></span>
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<pre style="margin: 0;">+<span id="LC880" class="line" lang="haskell"><span class="n" style="color: #333;">isInhabited</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;">Bool</span></span>
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881
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<pre style="margin: 0;">+<span id="LC881" class="line" lang="haskell"><span class="n" style="color: #333;">isInhabited</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MkDeltas</span> <span class="n" style="color: #333;">ds</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">ds</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC882" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC883" class="line" lang="haskell"><span class="cd">-- | Coverage checking action. Can be composed 'leftToRight' or 'topToBottom'.</span></span>
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<pre style="margin: 0;">+<span id="LC884" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">CheckAction</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;">CA</span> <span class="p">{</span> <span class="n" style="color: #333;">unCA</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="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CheckResult</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="LC885" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Functor</span></span>
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<pre style="margin: 0;">+<span id="LC886" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC887" class="line" lang="haskell"><span class="cd">-- | Composes 'CheckAction's top-to-bottom:</span></span>
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<pre style="margin: 0;">+<span id="LC888" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If a value falls through the resulting action, then it must fall through the</span></span>
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<pre style="margin: 0;">+<span id="LC889" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- first action and then through the second action.</span></span>
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<pre style="margin: 0;">+<span id="LC890" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If a value matches the resulting action, then it either matches the</span></span>
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<pre style="margin: 0;">+<span id="LC891" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- first action or matches the second action.</span></span>
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<pre style="margin: 0;">+<span id="LC892" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Basically the semantics of the LYG branching construct.</span></span>
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<pre style="margin: 0;">+<span id="LC893" class="line" lang="haskell"><span class="n" style="color: #333;">topToBottom</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="n" style="color: #333;">top</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">bot</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">ret</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC894" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CheckAction</span> <span class="n" style="color: #333;">top</span></span>
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<pre style="margin: 0;">+<span id="LC895" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CheckAction</span> <span class="n" style="color: #333;">bot</span></span>
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<pre style="margin: 0;">+<span id="LC896" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CheckAction</span> <span class="n" style="color: #333;">ret</span></span>
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<pre style="margin: 0;">+<span id="LC897" class="line" lang="haskell"><span class="n" style="color: #333;">topToBottom</span> <span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CA</span> <span class="n" style="color: #333;">top</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CA</span> <span class="n" style="color: #333;">bot</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CA</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">inc</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="LC898" class="line" lang="haskell"> <span class="n" style="color: #333;">t</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">top</span> <span class="n" style="color: #333;">inc</span></span>
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899
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<pre style="margin: 0;">+<span id="LC899" class="line" lang="haskell"> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">bot</span> <span class="p">(</span><span class="n" style="color: #333;">cr_uncov</span> <span class="n" style="color: #333;">t</span><span class="p">)</span></span>
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900
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<pre style="margin: 0;">+<span id="LC900" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">CheckResult</span> <span class="p">{</span> <span class="n" style="color: #333;">cr_ret</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="n" style="color: #333;">cr_ret</span> <span class="n" style="color: #333;">t</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">cr_ret</span> <span class="n" style="color: #333;">b</span><span class="p">)</span></span>
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901
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<pre style="margin: 0;">+<span id="LC901" 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;">cr_uncov</span> <span class="n" style="color: #333;">b</span></span>
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902
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<pre style="margin: 0;">+<span id="LC902" 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;">cr_approx</span> <span class="n" style="color: #333;">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;">cr_approx</span> <span class="n" style="color: #333;">b</span> <span class="p">}</span></span>
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903
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<pre style="margin: 0;">+<span id="LC903" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC904" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC905" class="line" lang="haskell"><span class="cd">-- | Composes 'CheckAction's left-to-right:</span></span>
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<pre style="margin: 0;">+<span id="LC906" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If a value falls through the resulting action, then it either falls through the</span></span>
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<pre style="margin: 0;">+<span id="LC907" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- first action or through the second action.</span></span>
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<pre style="margin: 0;">+<span id="LC908" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If a value matches the resulting action, then it must match the first action</span></span>
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<pre style="margin: 0;">+<span id="LC909" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- and then match the second action.</span></span>
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<pre style="margin: 0;">+<span id="LC910" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Basically the semantics of the LYG guard construct.</span></span>
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911
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<pre style="margin: 0;">+<span id="LC911" class="line" lang="haskell"><span class="n" style="color: #333;">leftToRight</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RedSets</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">right</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">ret</span><span class="p">)</span></span>
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912
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<pre style="margin: 0;">+<span id="LC912" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CheckAction</span> <span class="kt" style="color: #458; font-weight: 600;">RedSets</span></span>
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913
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<pre style="margin: 0;">+<span id="LC913" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CheckAction</span> <span class="n" style="color: #333;">right</span></span>
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914
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<pre style="margin: 0;">+<span id="LC914" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CheckAction</span> <span class="n" style="color: #333;">ret</span></span>
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915
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<pre style="margin: 0;">+<span id="LC915" class="line" lang="haskell"><span class="n" style="color: #333;">leftToRight</span> <span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CA</span> <span class="n" style="color: #333;">left</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CA</span> <span class="n" style="color: #333;">right</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CA</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">inc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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916
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<pre style="margin: 0;">+<span id="LC916" class="line" lang="haskell"> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">left</span> <span class="n" style="color: #333;">inc</span></span>
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917
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<pre style="margin: 0;">+<span id="LC917" class="line" lang="haskell"> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">right</span> <span class="p">(</span><span class="n" style="color: #333;">rs_cov</span> <span class="p">(</span><span class="n" style="color: #333;">cr_ret</span> <span class="n" style="color: #333;">l</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC918" 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="LC919" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">uncov</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cr_uncov</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;">cr_uncov</span> <span class="n" style="color: #333;">r</span></span>
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920
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<pre style="margin: 0;">+<span id="LC920" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Countering exponential blowup]</span></span>
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921
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<pre style="margin: 0;">+<span id="LC921" 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;">uncov'</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;">inc</span> <span class="n" style="color: #333;">uncov</span></span>
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922
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<pre style="margin: 0;">+<span id="LC922" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">CheckResult</span> <span class="p">{</span> <span class="n" style="color: #333;">cr_ret</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="n" style="color: #333;">cr_ret</span> <span class="n" style="color: #333;">l</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">cr_ret</span> <span class="n" style="color: #333;">r</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC923" 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;">uncov'</span></span>
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924
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<pre style="margin: 0;">+<span id="LC924" 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;">cr_approx</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;">cr_approx</span> <span class="n" style="color: #333;">r</span> <span class="p">}</span></span>
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979
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925
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<pre style="margin: 0;"> <span id="LC925" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC926" class="line" lang="haskell"><span class="cd">-- | @throttle limit old new@ returns @old@ if the number of 'Delta's in @new@</span></span>
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927
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<pre style="margin: 0;"> <span id="LC927" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- is exceeding the given @limit@ and the @old@ number of 'Delta's.</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">@@ -993,230 +939,226 @@ conMatchForces (PmAltConLike (RealDataCon dc))</td>
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<pre style="margin: 0;"> <span id="LC939" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isNewTyCon</span> <span class="p">(</span><span class="n" style="color: #333;">dataConTyCon</span> <span class="n" style="color: #333;">dc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;"> <span id="LC940" class="line" lang="haskell"><span class="n" style="color: #333;">conMatchForces</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;"> <span id="LC941" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC996" class="line" lang="haskell"><span class="cd">-- | Makes sure that we only wrap a single 'MayDiverge' around an</span></span>
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<pre style="margin: 0;">-<span id="LC997" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'AnnotatedTree', purely for esthetic reasons.</span></span>
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<pre style="margin: 0;">-<span id="LC998" class="line" lang="haskell"><span class="n" style="color: #333;">mayDiverge</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;">AnnotatedTree</span></span>
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<pre style="margin: 0;">-<span id="LC999" class="line" lang="haskell"><span class="n" style="color: #333;">mayDiverge</span> <span class="n" style="color: #333;">a</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MayDiverge</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;">a</span></span>
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<pre style="margin: 0;">-<span id="LC1000" class="line" lang="haskell"><span class="n" style="color: #333;">mayDiverge</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;">MayDiverge</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">-<span id="LC1001" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1002" class="line" lang="haskell"><span class="cd">-- | Computes two things:</span></span>
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1003
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<pre style="margin: 0;">-<span id="LC1003" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1004
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<pre style="margin: 0;">-<span id="LC1004" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * The set of uncovered values not matched by any of the clauses of the</span></span>
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1005
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<pre style="margin: 0;">-<span id="LC1005" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'GrdTree'. Note that 'PmCon' guards are the only way in which values</span></span>
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1006
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<pre style="margin: 0;">-<span id="LC1006" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- fall through from one 'Many' branch to the next.</span></span>
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1007
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<pre style="margin: 0;">-<span id="LC1007" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * An 'AnnotatedTree' that contains divergence and inaccessibility info</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;">-- for all clauses. Will be fed to 'extractRedundancyInfo' for</span></span>
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1009
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<pre style="margin: 0;">-<span id="LC1009" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- presenting redundant and proper innaccessible RHSs, as well as dead</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;">-- bangs to the user.</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;">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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1012
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<pre style="margin: 0;">-<span id="LC1012" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- RHS: Check that it covers something and wrap Inaccessible if not</span></span>
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1013
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<pre style="margin: 0;">-<span id="LC1013" 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;">Rhs</span> <span class="n" style="color: #333;">sdoc</span><span class="p">)</span> <span class="n" style="color: #333;">deltas</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1014
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<pre style="margin: 0;">-<span id="LC1014" class="line" lang="haskell"> <span class="n" style="color: #333;">is_covered</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isInhabited</span> <span class="n" style="color: #333;">deltas</span></span>
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1015
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<pre style="margin: 0;">-<span id="LC1015" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">clauses</span></span>
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1016
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<pre style="margin: 0;">-<span id="LC1016" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">is_covered</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">AccessibleRhs</span> <span class="n" style="color: #333;">deltas</span> <span class="n" style="color: #333;">sdoc</span></span>
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1017
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<pre style="margin: 0;">-<span id="LC1017" 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;">InaccessibleRhs</span> <span class="n" style="color: #333;">sdoc</span></span>
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1018
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<pre style="margin: 0;">-<span id="LC1018" 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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1019
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<pre style="margin: 0;">-<span id="LC1019" 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="n" style="color: #333;">clauses</span></span>
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1020
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<pre style="margin: 0;">-<span id="LC1020" 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="kt" style="color: #458; font-weight: 600;">MkDeltas</span> <span class="n" style="color: #333;">emptyBag</span></span>
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1021
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<pre style="margin: 0;">-<span id="LC1021" 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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1022
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<pre style="margin: 0;">-<span id="LC1022" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- let x = e: Refine with x ~ e</span></span>
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1023
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<pre style="margin: 0;">-<span id="LC1023" class="line" lang="haskell"><span class="n" style="color: #333;">checkGrdTree'</span> <span class="p">(</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;">PmLet</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;">tree</span><span class="p">)</span> <span class="n" style="color: #333;">deltas</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1024
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<pre style="margin: 0;">-<span id="LC1024" 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;">addPmCtDeltas</span> <span class="n" style="color: #333;">deltas</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmCoreCt</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span><span class="p">)</span></span>
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1025
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<pre style="margin: 0;">-<span id="LC1025" class="line" lang="haskell"> <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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1026
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<pre style="margin: 0;">-<span id="LC1026" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Bang x: Diverge on x ~ ⊥, refine with x /~ ⊥</span></span>
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1027
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<pre style="margin: 0;">-<span id="LC1027" 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;">Guard</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmBang</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">src_bang_info</span><span class="p">)</span> <span class="n" style="color: #333;">tree</span><span class="p">)</span> <span class="n" style="color: #333;">deltas</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1028
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<pre style="margin: 0;">-<span id="LC1028" class="line" lang="haskell"> <span class="n" style="color: #333;">has_diverged</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;">PmBotCt</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="n" style="color: #333;">isInhabited</span></span>
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1029
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<pre style="margin: 0;">-<span id="LC1029" 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;">addPmCtDeltas</span> <span class="n" style="color: #333;">deltas</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmNotBotCt</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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1030
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<pre style="margin: 0;">-<span id="LC1030" 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;">tree</span> <span class="n" style="color: #333;">deltas'</span></span>
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1031
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<td class="diff-line-num new_line old" data-linenumber="942" 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="LC1031" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">clauses</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1032" 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">
1032
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<td class="diff-line-num new_line old" data-linenumber="942" 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="LC1032" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">has_diverged</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1033" 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">
1033
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<td class="diff-line-num new_line old" data-linenumber="942" 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="LC1033" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">info</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">src_bang_info</span></span>
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1034
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<td class="diff-line-num new_line old" data-linenumber="942" 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="LC1034" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">RedundantSrcBang</span> <span class="n" style="color: #333;">info</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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1035
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<pre style="margin: 0;">-<span id="LC1035" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">has_diverged</span></span>
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1036
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<pre style="margin: 0;">-<span id="LC1036" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mayDiverge</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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1037
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<td class="diff-line-num new_line old" data-linenumber="942" 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="LC1037" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="c1" style="color: #998; font-style: italic;">-- won't diverge and it wasn't a source bang</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1038" 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">
1038
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<pre style="margin: 0;">-<span id="LC1038" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cr_clauses</span> <span class="n" style="color: #333;">res</span></span>
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1039
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<pre style="margin: 0;">-<span id="LC1039" class="line" lang="haskell"></span>
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1040
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<pre style="margin: 0;">-<span id="LC1040" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">res</span><span class="p">{</span> <span class="n" style="color: #333;">cr_clauses</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">clauses</span> <span class="p">}</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1041" 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">
1041
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<pre style="margin: 0;">-<span id="LC1041" class="line" lang="haskell"></span>
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1042
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<td class="diff-line-num new_line old" data-linenumber="942" 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="LC1042" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Con: Diverge on x ~ ⊥, fall through on x /~ K and refine with x ~ K ys</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1043" 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">
1043
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<pre style="margin: 0;">-<span id="LC1043" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- and type info</span></span>
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1044
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<pre style="margin: 0;">-<span id="LC1044" 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;">Guard</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmCon</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;">dicts</span> <span class="n" style="color: #333;">args</span><span class="p">)</span> <span class="n" style="color: #333;">tree</span><span class="p">)</span> <span class="n" style="color: #333;">deltas</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1045" 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">
1045
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<pre style="margin: 0;">-<span id="LC1045" class="line" lang="haskell"> <span class="n" style="color: #333;">has_diverged</span> <span class="o" style="font-weight: 600;"><-</span></span>
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<pre style="margin: 0;">-<span id="LC1046" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">conMatchForces</span> <span class="n" style="color: #333;">con</span></span>
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1047
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<pre style="margin: 0;">-<span id="LC1047" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</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;">PmBotCt</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="n" style="color: #333;">isInhabited</span></span>
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1048
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<pre style="margin: 0;">-<span id="LC1048" 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;">False</span></span>
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1049
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<pre style="margin: 0;">-<span id="LC1049" 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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1050
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<pre style="margin: 0;">-<span id="LC1050" 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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1051
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<pre style="margin: 0;">-<span id="LC1051" 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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1052
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<td class="diff-line-num new_line old" data-linenumber="942" 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="LC1052" 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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1053
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<pre style="margin: 0;">-<span id="LC1053" 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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1054
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<pre style="margin: 0;">-<span id="LC1054" 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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1055
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<pre style="margin: 0;">-<span id="LC1055" 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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1056
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<pre style="margin: 0;">-<span id="LC1056" 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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1057
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<pre style="margin: 0;">-<span id="LC1057" 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="n" style="color: #333;">applyWhen</span> <span class="n" style="color: #333;">has_diverged</span> <span class="n" style="color: #333;">mayDiverge</span> <span class="n" style="color: #333;">tree'</span></span>
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1058
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<pre style="margin: 0;">-<span id="LC1058" 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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1059
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<pre style="margin: 0;">-<span id="LC1059" 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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1060
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<pre style="margin: 0;">-<span id="LC1060" 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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1061
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<pre style="margin: 0;">-<span id="LC1061" 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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942
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<pre style="margin: 0;">+<span id="LC942" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- First the functions that correspond to checking LYG primitives:</span></span>
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943
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<pre style="margin: 0;">+<span id="LC943" class="line" lang="haskell"></span>
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944
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<pre style="margin: 0;">+<span id="LC944" class="line" lang="haskell"><span class="n" style="color: #333;">checkSequence</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="n" style="color: #333;">grdtree</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CheckAction</span> <span class="n" style="color: #333;">anntree</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span> <span class="n" style="color: #333;">grdtree</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CheckAction</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span> <span class="n" style="color: #333;">anntree</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC945" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The implementation is pretty similar to</span></span>
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<pre style="margin: 0;">+<span id="LC946" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @traverse1 :: Apply f => (a -> f b) -> NonEmpty a -> f (NonEmpty b)@</span></span>
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<pre style="margin: 0;">+<span id="LC947" class="line" lang="haskell"><span class="n" style="color: #333;">checkSequence</span> <span class="n" style="color: #333;">act</span> <span class="p">(</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;">[]</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="o" style="font-weight: 600;">:|</span> <span class="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;">act</span> <span class="n" style="color: #333;">t</span></span>
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948
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<pre style="margin: 0;">+<span id="LC948" class="line" lang="haskell"><span class="n" style="color: #333;">checkSequence</span> <span class="n" style="color: #333;">act</span> <span class="p">(</span><span class="n" style="color: #333;">t1</span> <span class="o" style="font-weight: 600;">:|</span> <span class="p">(</span><span class="n" style="color: #333;">t2</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>
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<pre style="margin: 0;">+<span id="LC949" class="line" lang="haskell"> <span class="n" style="color: #333;">topToBottom</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NE</span><span class="o" style="font-weight: 600;">.<|</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">act</span> <span class="n" style="color: #333;">t1</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">checkSequence</span> <span class="n" style="color: #333;">act</span> <span class="p">(</span><span class="n" style="color: #333;">t2</span><span class="o" style="font-weight: 600;">:|</span><span class="n" style="color: #333;">ts</span><span class="p">))</span></span>
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950
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<pre style="margin: 0;">+<span id="LC950" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC951" class="line" lang="haskell"><span class="n" style="color: #333;">checkGrd</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmGrd</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CheckAction</span> <span class="kt" style="color: #458; font-weight: 600;">RedSets</span></span>
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952
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<pre style="margin: 0;">+<span id="LC952" class="line" lang="haskell"><span class="n" style="color: #333;">checkGrd</span> <span class="n" style="color: #333;">grd</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CA</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">inc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">grd</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC953" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- let x = e: Refine with x ~ e</span></span>
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<pre style="margin: 0;">+<span id="LC954" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmLet</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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<pre style="margin: 0;">+<span id="LC955" class="line" lang="haskell"> <span class="n" style="color: #333;">matched</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addPmCtDeltas</span> <span class="n" style="color: #333;">inc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmCoreCt</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC956" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">CheckResult</span> <span class="p">{</span> <span class="n" style="color: #333;">cr_ret</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyRedSets</span> <span class="p">{</span> <span class="n" style="color: #333;">rs_cov</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">matched</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC957" 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;">mempty</span></span>
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<pre style="margin: 0;">+<span id="LC958" 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="LC959" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Bang x _: Diverge on x ~ ⊥, refine with x /~ ⊥</span></span>
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960
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<pre style="margin: 0;">+<span id="LC960" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmBang</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">mb_info</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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961
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<pre style="margin: 0;">+<span id="LC961" class="line" lang="haskell"> <span class="n" style="color: #333;">div</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addPmCtDeltas</span> <span class="n" style="color: #333;">inc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmBotCt</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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962
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<pre style="margin: 0;">+<span id="LC962" class="line" lang="haskell"> <span class="n" style="color: #333;">matched</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addPmCtDeltas</span> <span class="n" style="color: #333;">inc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmNotBotCt</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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963
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<pre style="margin: 0;">+<span id="LC963" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Dead bang patterns]</span></span>
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<pre style="margin: 0;">+<span id="LC964" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- mb_info = Just info <==> PmBang originates from bang pattern in source</span></span>
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965
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<pre style="margin: 0;">+<span id="LC965" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">bangs</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">info</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mb_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unitOL</span> <span class="p">(</span><span class="n" style="color: #333;">div</span><span class="p">,</span> <span class="n" style="color: #333;">info</span><span class="p">)</span></span>
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966
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<pre style="margin: 0;">+<span id="LC966" 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;">NilOL</span></span>
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967
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<pre style="margin: 0;">+<span id="LC967" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">CheckResult</span> <span class="p">{</span> <span class="n" style="color: #333;">cr_ret</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">RedSets</span> <span class="p">{</span> <span class="n" style="color: #333;">rs_cov</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">matched</span><span class="p">,</span> <span class="n" style="color: #333;">rs_div</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">div</span><span class="p">,</span> <span class="n" style="color: #333;">rs_bangs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bangs</span> <span class="p">}</span></span>
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968
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<pre style="margin: 0;">+<span id="LC968" 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;">mempty</span></span>
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969
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<pre style="margin: 0;">+<span id="LC969" 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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970
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<pre style="margin: 0;">+<span id="LC970" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Con: Diverge on x ~ ⊥, fall through on x /~ K and refine with x ~ K ys</span></span>
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971
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<pre style="margin: 0;">+<span id="LC971" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- and type info</span></span>
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972
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<pre style="margin: 0;">+<span id="LC972" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmCon</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;">dicts</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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973
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<pre style="margin: 0;">+<span id="LC973" class="line" lang="haskell"> <span class="n" style="color: #333;">div</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">conMatchForces</span> <span class="n" style="color: #333;">con</span></span>
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974
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<pre style="margin: 0;">+<span id="LC974" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">addPmCtDeltas</span> <span class="n" style="color: #333;">inc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmBotCt</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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975
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<pre style="margin: 0;">+<span id="LC975" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">mempty</span></span>
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976
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<pre style="margin: 0;">+<span id="LC976" class="line" lang="haskell"> <span class="n" style="color: #333;">uncov</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addPmCtDeltas</span> <span class="n" style="color: #333;">inc</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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977
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<pre style="margin: 0;">+<span id="LC977" class="line" lang="haskell"> <span class="n" style="color: #333;">matched</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addPmCtsDeltas</span> <span class="n" style="color: #333;">inc</span> <span class="o" style="font-weight: 600;">$</span></span>
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978
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<pre style="margin: 0;">+<span id="LC978" class="line" lang="haskell"> <span class="n" style="color: #333;">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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979
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<pre style="margin: 0;">+<span id="LC979" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- tracePm "checkGrd:Con" (ppr inc $$ ppr x $$ ppr con $$ ppr dicts $$ ppr matched)</span></span>
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980
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<pre style="margin: 0;">+<span id="LC980" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">CheckResult</span> <span class="p">{</span> <span class="n" style="color: #333;">cr_ret</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyRedSets</span> <span class="p">{</span> <span class="n" style="color: #333;">rs_cov</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">matched</span><span class="p">,</span> <span class="n" style="color: #333;">rs_div</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">div</span> <span class="p">}</span></span>
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981
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<pre style="margin: 0;">+<span id="LC981" 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;">uncov</span></span>
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<pre style="margin: 0;">+<span id="LC982" 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="LC983" class="line" lang="haskell"></span>
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984
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<pre style="margin: 0;">+<span id="LC984" class="line" lang="haskell"><span class="n" style="color: #333;">checkGrds</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PmGrd</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CheckAction</span> <span class="kt" style="color: #458; font-weight: 600;">RedSets</span></span>
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985
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<pre style="margin: 0;">+<span id="LC985" class="line" lang="haskell"><span class="n" style="color: #333;">checkGrds</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;">CA</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">inc</span> <span class="o" style="font-weight: 600;">-></span></span>
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986
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<pre style="margin: 0;">+<span id="LC986" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">CheckResult</span> <span class="p">{</span> <span class="n" style="color: #333;">cr_ret</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyRedSets</span> <span class="p">{</span> <span class="n" style="color: #333;">rs_cov</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">inc</span> <span class="p">}</span></span>
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987
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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;">mempty</span></span>
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988
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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="kt" style="color: #458; font-weight: 600;">Precise</span> <span class="p">}</span></span>
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989
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<pre style="margin: 0;">+<span id="LC989" class="line" lang="haskell"><span class="n" style="color: #333;">checkGrds</span> <span class="p">(</span><span class="n" style="color: #333;">g</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">grds</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">leftToRight</span> <span class="n" style="color: #333;">merge</span> <span class="p">(</span><span class="n" style="color: #333;">checkGrd</span> <span class="n" style="color: #333;">g</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">checkGrds</span> <span class="n" style="color: #333;">grds</span><span class="p">)</span></span>
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1062
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990
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<pre style="margin: 0;"> <span id="LC990" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1063
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<pre style="margin: 0;">-<span id="LC1063" 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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1064
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<pre style="margin: 0;">-<span id="LC1064" 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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1065
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<pre style="margin: 0;">-<span id="LC1065" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 'AnnotatedTree', not a list thereof. Hence 3 parameters to thread the</span></span>
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1066
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<pre style="margin: 0;">-<span id="LC1066" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- fields.</span></span>
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1067
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<pre style="margin: 0;">-<span id="LC1067" 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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1068
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<pre style="margin: 0;">-<span id="LC1068" 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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1069
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<pre style="margin: 0;">-<span id="LC1069" 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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1070
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<pre style="margin: 0;">-<span id="LC1070" 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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1071
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<pre style="margin: 0;">-<span id="LC1071" 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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1072
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<pre style="margin: 0;">-<span id="LC1072" 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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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;">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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1074
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<pre style="margin: 0;">-<span id="LC1074" 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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1075
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<pre style="margin: 0;">-<span id="LC1075" 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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<pre style="margin: 0;">-<span id="LC1076" class="line" lang="haskell"></span>
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1077
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<pre style="margin: 0;">-<span id="LC1077" class="line" lang="haskell"><span class="cd">-- | Print diagnostic info and actually call 'checkGrdTree''.</span></span>
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1078
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<pre style="margin: 0;">-<span id="LC1078" 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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1079
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<pre style="margin: 0;">-<span id="LC1079" class="line" lang="haskell"><span class="n" style="color: #333;">checkGrdTree</span> <span class="n" style="color: #333;">guards</span> <span class="n" style="color: #333;">deltas</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1080
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<pre style="margin: 0;">-<span id="LC1080" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"checkGrdTree {"</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">guards</span></span>
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1081
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<pre style="margin: 0;">-<span id="LC1081" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">deltas</span> <span class="p">]</span></span>
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1082
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<pre style="margin: 0;">-<span id="LC1082" class="line" lang="haskell"> <span class="n" style="color: #333;">res</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkGrdTree'</span> <span class="n" style="color: #333;">guards</span> <span class="n" style="color: #333;">deltas</span></span>
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1083
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<pre style="margin: 0;">-<span id="LC1083" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"checkGrdTree }:"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">res</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- braces are easier to match by tooling</span></span>
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1084
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<pre style="margin: 0;">-<span id="LC1084" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">res</span></span>
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1085
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<pre style="margin: 0;">-<span id="LC1085" class="line" lang="haskell"></span>
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1086
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<pre style="margin: 0;">-<span id="LC1086" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ----------------------------------------------------------------------------</span></span>
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1087
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<pre style="margin: 0;">-<span id="LC1087" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Propagation of term constraints inwards when checking nested matches</span></span>
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1088
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<pre style="margin: 0;">-<span id="LC1088" class="line" lang="haskell"></span>
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1089
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<pre style="margin: 0;">-<span id="LC1089" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Type and Term Equality Propagation]</span></span>
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1090
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<pre style="margin: 0;">-<span id="LC1090" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1091
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<pre style="margin: 0;">-<span id="LC1091" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">When checking a match it would be great to have all type and term information</span></span>
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1092
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<pre style="margin: 0;">-<span id="LC1092" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">available so we can get more precise results. For this reason we have functions</span></span>
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1093
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<pre style="margin: 0;">-<span id="LC1093" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">`addDictsDs' and `addTmVarCsDs' in GHC.HsToCore.Monad that store in the</span></span>
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1094
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<pre style="margin: 0;">-<span id="LC1094" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">environment type and term constraints (respectively) as we go deeper.</span></span>
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1095
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<pre style="margin: 0;">-<span id="LC1095" class="line" lang="haskell"></span>
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1096
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<pre style="margin: 0;">-<span id="LC1096" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The type constraints we propagate inwards are collected by `collectEvVarsPats'</span></span>
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1097
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<pre style="margin: 0;">-<span id="LC1097" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in GHC.Hs.Pat. This handles bug #4139 ( see example</span></span>
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1098
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<pre style="margin: 0;">-<span id="LC1098" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> https://gitlab.haskell.org/ghc/ghc/snippets/672 )</span></span>
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1099
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<pre style="margin: 0;">-<span id="LC1099" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">where this is needed.</span></span>
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1100
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<pre style="margin: 0;">-<span id="LC1100" class="line" lang="haskell"></span>
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1101
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<pre style="margin: 0;">-<span id="LC1101" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For term equalities we do less, we just generate equalities for HsCase. For</span></span>
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1102
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<pre style="margin: 0;">-<span id="LC1102" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">example we accurately give 2 redundancy warnings for the marked cases:</span></span>
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1103
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<pre style="margin: 0;">-<span id="LC1103" class="line" lang="haskell"></span>
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1104
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<pre style="margin: 0;">-<span id="LC1104" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">f :: [a] -> Bool</span></span>
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1105
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<pre style="margin: 0;">-<span id="LC1105" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">f x = case x of</span></span>
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1106
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<pre style="margin: 0;">-<span id="LC1106" class="line" lang="haskell"></span>
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1107
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<pre style="margin: 0;">-<span id="LC1107" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [] -> case x of -- brings (x ~ []) in scope</span></span>
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1108
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<pre style="margin: 0;">-<span id="LC1108" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [] -> True</span></span>
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1109
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<pre style="margin: 0;">-<span id="LC1109" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (_:_) -> False -- can't happen</span></span>
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1110
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<pre style="margin: 0;">-<span id="LC1110" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1111" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (_:_) -> case x of -- brings (x ~ (_:_)) in scope</span></span>
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1112
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<pre style="margin: 0;">-<span id="LC1112" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (_:_) -> True</span></span>
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1113
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<pre style="margin: 0;">-<span id="LC1113" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [] -> False -- can't happen</span></span>
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1114
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<pre style="margin: 0;">-<span id="LC1114" class="line" lang="haskell"></span>
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1115
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<pre style="margin: 0;">-<span id="LC1115" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Functions `addScrutTmCs' is responsible for generating</span></span>
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1116
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<pre style="margin: 0;">-<span id="LC1116" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">these constraints.</span></span>
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1117
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<pre style="margin: 0;">-<span id="LC1117" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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991
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<pre style="margin: 0;">+<span id="LC991" class="line" lang="haskell"> <span class="n" style="color: #333;">merge</span> <span class="n" style="color: #333;">ri_g</span> <span class="n" style="color: #333;">ri_grds</span> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- This operation would /not/ form a Semigroup!</span></span>
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992
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<pre style="margin: 0;">+<span id="LC992" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">RedSets</span> <span class="p">{</span> <span class="n" style="color: #333;">rs_cov</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rs_cov</span> <span class="n" style="color: #333;">ri_grds</span></span>
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993
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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;">rs_div</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rs_div</span> <span class="n" style="color: #333;">ri_g</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;">rs_div</span> <span class="n" style="color: #333;">ri_grds</span></span>
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994
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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;">rs_bangs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rs_bangs</span> <span class="n" style="color: #333;">ri_g</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;">rs_bangs</span> <span class="n" style="color: #333;">ri_grds</span> <span class="p">}</span></span>
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995
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<pre style="margin: 0;"> <span id="LC995" class="line" lang="haskell"></span>
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1119
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<pre style="margin: 0;">-<span id="LC1119" class="line" lang="haskell"><span class="cd">-- | Locally update 'dsl_deltas' with the given action, but defer evaluation</span></span>
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1120
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<pre style="margin: 0;">-<span id="LC1120" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- with 'unsafeInterleaveM' in order not to do unnecessary work.</span></span>
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1121
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<pre style="margin: 0;">-<span id="LC1121" class="line" lang="haskell"><span class="n" style="color: #333;">locallyExtendPmDelta</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="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 class="p">)</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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1122
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<pre style="margin: 0;">-<span id="LC1122" class="line" lang="haskell"><span class="n" style="color: #333;">locallyExtendPmDelta</span> <span class="n" style="color: #333;">ext</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1123
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<pre style="margin: 0;">-<span id="LC1123" class="line" lang="haskell"> <span class="n" style="color: #333;">deltas</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getPmDeltas</span></span>
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1124
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<pre style="margin: 0;">-<span id="LC1124" 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;">unsafeInterleaveM</span> <span class="o" style="font-weight: 600;">$</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1125
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<pre style="margin: 0;">-<span id="LC1125" 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;">ext</span> <span class="n" style="color: #333;">deltas</span></span>
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1126
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<pre style="margin: 0;">-<span id="LC1126" class="line" lang="haskell"> <span class="n" style="color: #333;">inh</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isInhabited</span> <span class="n" style="color: #333;">deltas'</span></span>
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1127
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<pre style="margin: 0;">-<span id="LC1127" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If adding a constraint would lead to a contradiction, don't add it.</span></span>
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1128
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<pre style="margin: 0;">-<span id="LC1128" 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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1129
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<pre style="margin: 0;">-<span id="LC1129" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- for why this is done.</span></span>
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1130
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<pre style="margin: 0;">-<span id="LC1130" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">inh</span></span>
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1131
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<pre style="margin: 0;">-<span id="LC1131" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">deltas'</span></span>
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1132
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<pre style="margin: 0;">-<span id="LC1132" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">deltas</span></span>
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1133
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<pre style="margin: 0;">-<span id="LC1133" class="line" lang="haskell"> <span class="n" style="color: #333;">updPmDeltas</span> <span class="n" style="color: #333;">deltas'</span> <span class="n" style="color: #333;">k</span></span>
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996
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<pre style="margin: 0;">+<span id="LC996" class="line" lang="haskell"><span class="n" style="color: #333;">checkMatchGroup</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmMatchGroup</span> <span class="kt" style="color: #458; font-weight: 600;">Pre</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CheckAction</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmMatchGroup</span> <span class="kt" style="color: #458; font-weight: 600;">Post</span><span class="p">)</span></span>
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997
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<pre style="margin: 0;">+<span id="LC997" class="line" lang="haskell"><span class="n" style="color: #333;">checkMatchGroup</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmMatchGroup</span> <span class="n" style="color: #333;">matches</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span></span>
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998
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<pre style="margin: 0;">+<span id="LC998" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmMatchGroup</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">checkSequence</span> <span class="n" style="color: #333;">checkMatch</span> <span class="n" style="color: #333;">matches</span></span>
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1134
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999
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<pre style="margin: 0;"> <span id="LC999" class="line" lang="haskell"></span>
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1135
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<pre style="margin: 0;">-<span id="LC1135" class="line" lang="haskell"><span class="cd">-- | Add in-scope type constraints if the coverage checker might run and then</span></span>
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1136
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<pre style="margin: 0;">-<span id="LC1136" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- run the given action.</span></span>
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<pre style="margin: 0;">-<span id="LC1137" class="line" lang="haskell"><span class="n" style="color: #333;">addTyCsDs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Origin</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="kt" style="color: #458; font-weight: 600;">EvVar</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="LC1138" class="line" lang="haskell"><span class="n" style="color: #333;">addTyCsDs</span> <span class="n" style="color: #333;">origin</span> <span class="n" style="color: #333;">ev_vars</span> <span class="n" style="color: #333;">m</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="LC1139" 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="LC1140" class="line" lang="haskell"> <span class="n" style="color: #333;">applyWhen</span> <span class="p">(</span><span class="n" style="color: #333;">needToRunPmCheck</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">origin</span><span class="p">)</span></span>
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1141
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<pre style="margin: 0;">-<span id="LC1141" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">locallyExtendPmDelta</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><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="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;">ev_vars</span><span class="p">)))</span></span>
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1142
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<pre style="margin: 0;">-<span id="LC1142" class="line" lang="haskell"> <span class="n" style="color: #333;">m</span></span>
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<pre style="margin: 0;">+<span id="LC1000" class="line" lang="haskell"><span class="n" style="color: #333;">checkMatch</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmMatch</span> <span class="kt" style="color: #458; font-weight: 600;">Pre</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CheckAction</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmMatch</span> <span class="kt" style="color: #458; font-weight: 600;">Post</span><span class="p">)</span></span>
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1001
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<pre style="margin: 0;">+<span id="LC1001" class="line" lang="haskell"><span class="n" style="color: #333;">checkMatch</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmMatch</span> <span class="p">{</span> <span class="n" style="color: #333;">pm_pats</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">grds</span><span class="p">,</span> <span class="n" style="color: #333;">pm_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>
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<pre style="margin: 0;">+<span id="LC1002" class="line" lang="haskell"> <span class="n" style="color: #333;">leftToRight</span> <span class="kt" style="color: #458; font-weight: 600;">PmMatch</span> <span class="p">(</span><span class="n" style="color: #333;">checkGrds</span> <span class="n" style="color: #333;">grds</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">checkGRHSs</span> <span class="n" style="color: #333;">grhss</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1003" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1144" class="line" lang="haskell"><span class="cd">-- | Add equalities for the scrutinee to the local 'DsM' environment when</span></span>
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<pre style="margin: 0;">-<span id="LC1145" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- checking a case expression:</span></span>
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<pre style="margin: 0;">-<span id="LC1146" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- case e of x { matches }</span></span>
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<pre style="margin: 0;">-<span id="LC1147" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- When checking matches we record that (x ~ e) where x is the initial</span></span>
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<pre style="margin: 0;">-<span id="LC1148" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- uncovered. All matches will have to satisfy this equality.</span></span>
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<pre style="margin: 0;">-<span id="LC1149" class="line" lang="haskell"><span class="n" style="color: #333;">addScrutTmCs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">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="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;">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="LC1150" class="line" lang="haskell"><span class="n" style="color: #333;">addScrutTmCs</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">k</span></span>
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1151
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<pre style="margin: 0;">-<span id="LC1151" class="line" lang="haskell"><span class="n" style="color: #333;">addScrutTmCs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">scr</span><span class="p">)</span> <span class="p">[</span><span class="n" style="color: #333;">x</span><span class="p">]</span> <span class="n" style="color: #333;">k</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="LC1152" class="line" lang="haskell"> <span class="n" style="color: #333;">scr_e</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsLExpr</span> <span class="n" style="color: #333;">scr</span></span>
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<pre style="margin: 0;">-<span id="LC1153" class="line" lang="haskell"> <span class="n" style="color: #333;">locallyExtendPmDelta</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><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="p">(</span><span class="n" style="color: #333;">unitBag</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmCoreCt</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">scr_e</span><span class="p">)))</span> <span class="n" style="color: #333;">k</span></span>
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1154
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<pre style="margin: 0;">-<span id="LC1154" class="line" lang="haskell"><span class="n" style="color: #333;">addScrutTmCs</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;">"addScrutTmCs: HsCase with more than one case binder"</span></span>
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1155
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<pre style="margin: 0;">-<span id="LC1155" class="line" lang="haskell"></span>
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1156
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<pre style="margin: 0;">-<span id="LC1156" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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1157
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<pre style="margin: 0;">-<span id="LC1157" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">%************************************************************************</span></span>
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1158
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<pre style="margin: 0;">-<span id="LC1158" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">%* *</span></span>
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1159
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<pre style="margin: 0;">-<span id="LC1159" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Pretty printing of exhaustiveness/redundancy check warnings</span></span>
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1160
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<pre style="margin: 0;">-<span id="LC1160" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">%* *</span></span>
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1161
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<pre style="margin: 0;">-<span id="LC1161" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">%************************************************************************</span></span>
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1004
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<pre style="margin: 0;">+<span id="LC1004" class="line" lang="haskell"><span class="n" style="color: #333;">checkGRHSs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmGRHS</span> <span class="kt" style="color: #458; font-weight: 600;">Pre</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CheckAction</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmGRHS</span> <span class="kt" style="color: #458; font-weight: 600;">Post</span><span class="p">))</span></span>
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1005
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<pre style="margin: 0;">+<span id="LC1005" class="line" lang="haskell"><span class="n" style="color: #333;">checkGRHSs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">checkSequence</span> <span class="n" style="color: #333;">checkGRHS</span></span>
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1006
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<pre style="margin: 0;">+<span id="LC1006" class="line" lang="haskell"></span>
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1007
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<pre style="margin: 0;">+<span id="LC1007" class="line" lang="haskell"><span class="n" style="color: #333;">checkGRHS</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmGRHS</span> <span class="kt" style="color: #458; font-weight: 600;">Pre</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CheckAction</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmGRHS</span> <span class="kt" style="color: #458; font-weight: 600;">Post</span><span class="p">)</span></span>
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1008
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<pre style="margin: 0;">+<span id="LC1008" class="line" lang="haskell"><span class="n" style="color: #333;">checkGRHS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmGRHS</span> <span class="p">{</span> <span class="n" style="color: #333;">pg_grds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">grds</span><span class="p">,</span> <span class="n" style="color: #333;">pg_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs_info</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</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;">flip</span> <span class="kt" style="color: #458; font-weight: 600;">PmGRHS</span> <span class="n" style="color: #333;">rhs_info</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">checkGrds</span> <span class="n" style="color: #333;">grds</span></span>
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1010
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<pre style="margin: 0;">+<span id="LC1010" class="line" lang="haskell"></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;">checkEmptyCase</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmEmptyCase</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CheckAction</span> <span class="kt" style="color: #458; font-weight: 600;">PmEmptyCase</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1012" 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">
1012
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<pre style="margin: 0;">+<span id="LC1012" class="line" lang="haskell"><span class="n" style="color: #333;">checkEmptyCase</span> <span class="n" style="color: #333;">pe</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmEmptyCase</span> <span class="p">{</span> <span class="n" style="color: #333;">pe_var</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">var</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CA</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">inc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1013" 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">
1013
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<pre style="margin: 0;">+<span id="LC1013" class="line" lang="haskell"> <span class="n" style="color: #333;">unc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addPmCtDeltas</span> <span class="n" style="color: #333;">inc</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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<td class="diff-line-num new new_line" data-linenumber="1014" 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">
1014
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<pre style="margin: 0;">+<span id="LC1014" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">CheckResult</span> <span class="p">{</span> <span class="n" style="color: #333;">cr_ret</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pe</span><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 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;">mempty</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>
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1016
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<pre style="margin: 0;">+<span id="LC1016" class="line" lang="haskell"><span class="n" style="color: #333;">checkPatBind</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmPatBind</span> <span class="kt" style="color: #458; font-weight: 600;">Pre</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CheckAction</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmPatBind</span> <span class="kt" style="color: #458; font-weight: 600;">Post</span><span class="p">)</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;">checkPatBind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">coerce</span> <span class="n" style="color: #333;">checkGRHS</span></span>
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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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1019
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<pre style="margin: 0;">+<span id="LC1019" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Countering exponential blowup]</span></span>
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1020
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<pre style="margin: 0;">+<span id="LC1020" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1021
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<pre style="margin: 0;">+<span id="LC1021" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Precise pattern match exhaustiveness checking is necessarily exponential in</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1022" 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">
1022
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<pre style="margin: 0;">+<span id="LC1022" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the size of some input programs. We implement a counter-measure in the form of</span></span>
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1023
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<pre style="margin: 0;">+<span id="LC1023" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the -fmax-pmcheck-models flag, limiting the number of Deltas we check against</span></span>
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1024
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<pre style="margin: 0;">+<span id="LC1024" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">each pattern by a constant.</span></span>
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1025
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<pre style="margin: 0;">+<span id="LC1025" class="line" lang="haskell"></span>
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1026
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<pre style="margin: 0;">+<span id="LC1026" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">How do we do that? Consider</span></span>
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1027
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<pre style="margin: 0;">+<span id="LC1027" class="line" lang="haskell"></span>
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1028
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<pre style="margin: 0;">+<span id="LC1028" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f True True = ()</span></span>
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1029
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<pre style="margin: 0;">+<span id="LC1029" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f True True = ()</span></span>
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1030
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<pre style="margin: 0;">+<span id="LC1030" class="line" lang="haskell"></span>
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1031
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<pre style="margin: 0;">+<span id="LC1031" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">And imagine we set our limit to 1 for the sake of the example. The first clause</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1032" 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">
1032
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<pre style="margin: 0;">+<span id="LC1032" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">will be checked against the initial Delta, {}. Doing so will produce an</span></span>
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1033
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<pre style="margin: 0;">+<span id="LC1033" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Uncovered set of size 2, containing the models {x/~True} and {x~True,y/~True}.</span></span>
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1034
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<pre style="margin: 0;">+<span id="LC1034" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Also we find the first clause to cover the model {x~True,y~True}.</span></span>
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1035
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<pre style="margin: 0;">+<span id="LC1035" class="line" lang="haskell"></span>
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1036
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<pre style="margin: 0;">+<span id="LC1036" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But the Uncovered set we get out of the match is too huge! We somehow have to</span></span>
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1037
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<pre style="margin: 0;">+<span id="LC1037" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">ensure not to make things worse as they are already, so we continue checking</span></span>
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1038
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<pre style="margin: 0;">+<span id="LC1038" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with a singleton Uncovered set of the initial Delta {}. Why is this</span></span>
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1039
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<pre style="margin: 0;">+<span id="LC1039" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">sound (wrt. the notion in GADTs Meet Their Match)? Well, it basically amounts</span></span>
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1040
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<pre style="margin: 0;">+<span id="LC1040" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to forgetting that we matched against the first clause. The values represented</span></span>
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1041
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<pre style="margin: 0;">+<span id="LC1041" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">by {} are a superset of those represented by its two refinements {x/~True} and</span></span>
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1042
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<pre style="margin: 0;">+<span id="LC1042" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{x~True,y/~True}.</span></span>
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1043
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<pre style="margin: 0;">+<span id="LC1043" class="line" lang="haskell"></span>
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1044
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<pre style="margin: 0;">+<span id="LC1044" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This forgetfulness becomes very apparent in the example above: By continuing</span></span>
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1045
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<pre style="margin: 0;">+<span id="LC1045" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with {} we don't detect the second clause as redundant, as it again covers the</span></span>
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1046
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<pre style="margin: 0;">+<span id="LC1046" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">same non-empty subset of {}. So we don't flag everything as redundant anymore,</span></span>
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1047
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<pre style="margin: 0;">+<span id="LC1047" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">but still will never flag something as redundant that isn't.</span></span>
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1048
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<pre style="margin: 0;">+<span id="LC1048" class="line" lang="haskell"></span>
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1049
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<pre style="margin: 0;">+<span id="LC1049" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For exhaustivity, the converse applies: We will report @f@ as non-exhaustive</span></span>
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1050
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<pre style="margin: 0;">+<span id="LC1050" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and report @f _ _@ as missing, which is a superset of the actual missing</span></span>
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1051
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<pre style="margin: 0;">+<span id="LC1051" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">matches. But soundness means we will never fail to report a missing match.</span></span>
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1052
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<pre style="margin: 0;">+<span id="LC1052" class="line" lang="haskell"></span>
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1053
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<pre style="margin: 0;">+<span id="LC1053" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This mechanism is implemented in 'throttle'.</span></span>
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1054
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<pre style="margin: 0;">+<span id="LC1054" class="line" lang="haskell"></span>
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1055
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<pre style="margin: 0;">+<span id="LC1055" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Guards are an extreme example in this regard, with #11195 being a particularly</span></span>
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1056
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<pre style="margin: 0;">+<span id="LC1056" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">dreadful example: Since their RHS are often pretty much unique, we split on a</span></span>
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1057
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<pre style="margin: 0;">+<span id="LC1057" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">variable (the one representing the RHS) that doesn't occur anywhere else in the</span></span>
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1058
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<pre style="margin: 0;">+<span id="LC1058" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">program, so we don't actually get useful information out of that split!</span></span>
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1162
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1059
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<pre style="margin: 0;"> <span id="LC1059" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1163
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1060
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<pre style="margin: 0;"> <span id="LC1060" class="line" lang="haskell"></span>
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1164
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<pre style="margin: 0;">-<span id="LC1164" class="line" lang="haskell"><span class="cd">-- | Check whether any part of pattern match checking is enabled for this</span></span>
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1165
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<pre style="margin: 0;">-<span id="LC1165" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'HsMatchContext' (does not matter whether it is the redundancy check or the</span></span>
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1166
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<pre style="margin: 0;">-<span id="LC1166" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- exhaustiveness check).</span></span>
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1167
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<pre style="margin: 0;">-<span id="LC1167" class="line" lang="haskell"><span class="n" style="color: #333;">isMatchContextPmChecked</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Origin</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsMatchContext</span> <span class="n" style="color: #333;">id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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1168
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<pre style="margin: 0;">-<span id="LC1168" class="line" lang="haskell"><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;">kind</span></span>
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1169
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<pre style="margin: 0;">-<span id="LC1169" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isGenerated</span> <span class="n" style="color: #333;">origin</span></span>
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1170
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<pre style="margin: 0;">-<span id="LC1170" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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1171
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<pre style="margin: 0;">-<span id="LC1171" 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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1172
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<pre style="margin: 0;">-<span id="LC1172" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wopt</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_WarnOverlappingPatterns</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;">||</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>
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1061
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<pre style="margin: 0;">+<span id="LC1061" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1062
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<pre style="margin: 0;">+<span id="LC1062" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Collecting long-distance information</span></span>
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1063
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<pre style="margin: 0;">+<span id="LC1063" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1173
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1064
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<pre style="margin: 0;"> <span id="LC1064" class="line" lang="haskell"></span>
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1174
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<pre style="margin: 0;">-<span id="LC1174" class="line" lang="haskell"><span class="cd">-- | Return True when any of the pattern match warnings ('allPmCheckWarnings')</span></span>
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1175
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<pre style="margin: 0;">-<span id="LC1175" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- are enabled, in which case we need to run the pattern match checker.</span></span>
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1176
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<pre style="margin: 0;">-<span id="LC1176" class="line" lang="haskell"><span class="n" style="color: #333;">needToRunPmCheck</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Origin</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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1177
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<pre style="margin: 0;">-<span id="LC1177" class="line" lang="haskell"><span class="n" style="color: #333;">needToRunPmCheck</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">origin</span></span>
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1178
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<pre style="margin: 0;">-<span id="LC1178" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isGenerated</span> <span class="n" style="color: #333;">origin</span></span>
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1179
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<pre style="margin: 0;">-<span id="LC1179" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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1180
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<pre style="margin: 0;">-<span id="LC1180" 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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1181
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<pre style="margin: 0;">-<span id="LC1181" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">notNull</span> <span class="p">(</span><span class="n" style="color: #333;">filter</span> <span class="p">(`</span><span class="n" style="color: #333;">wopt</span><span class="p">`</span> <span class="n" style="color: #333;">dflags</span><span class="p">)</span> <span class="n" style="color: #333;">allPmCheckWarnings</span><span class="p">)</span></span>
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1065
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<pre style="margin: 0;">+<span id="LC1065" class="line" lang="haskell"><span class="n" style="color: #333;">ldiMatchGroup</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmMatchGroup</span> <span class="kt" style="color: #458; font-weight: 600;">Post</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">NonEmpty</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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1066
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<pre style="margin: 0;">+<span id="LC1066" class="line" lang="haskell"><span class="n" style="color: #333;">ldiMatchGroup</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmMatchGroup</span> <span class="n" style="color: #333;">matches</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ldiMatch</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">matches</span></span>
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1067
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<pre style="margin: 0;">+<span id="LC1067" class="line" lang="haskell"></span>
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1068
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<pre style="margin: 0;">+<span id="LC1068" class="line" lang="haskell"><span class="n" style="color: #333;">ldiMatch</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmMatch</span> <span class="kt" style="color: #458; font-weight: 600;">Post</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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1069
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<pre style="margin: 0;">+<span id="LC1069" class="line" lang="haskell"><span class="n" style="color: #333;">ldiMatch</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmMatch</span> <span class="p">{</span> <span class="n" style="color: #333;">pm_pats</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">red</span><span class="p">,</span> <span class="n" style="color: #333;">pm_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>
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1070
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<pre style="margin: 0;">+<span id="LC1070" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">rs_cov</span> <span class="n" style="color: #333;">red</span><span class="p">,</span> <span class="n" style="color: #333;">ldiGRHS</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">grhss</span><span class="p">)</span></span>
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1071
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<pre style="margin: 0;">+<span id="LC1071" class="line" lang="haskell"></span>
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1072
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<pre style="margin: 0;">+<span id="LC1072" class="line" lang="haskell"><span class="n" style="color: #333;">ldiGRHS</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmGRHS</span> <span class="kt" style="color: #458; font-weight: 600;">Post</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Deltas</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;">ldiGRHS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmGRHS</span> <span class="p">{</span> <span class="n" style="color: #333;">pg_grds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">red</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rs_cov</span> <span class="n" style="color: #333;">red</span></span>
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1182
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1074
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<pre style="margin: 0;"> <span id="LC1074" class="line" lang="haskell"></span>
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1183
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<pre style="margin: 0;">-<span id="LC1183" class="line" lang="haskell"><span class="cd">-- | A type for organising information to be used in warnings.</span></span>
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1184
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<pre style="margin: 0;">-<span id="LC1184" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">RedundancyInfo</span></span>
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1185
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<pre style="margin: 0;">-<span id="LC1185" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">RedundancyInfo</span></span>
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1186
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<pre style="margin: 0;">-<span id="LC1186" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">redundant_rhss</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">SrcInfo</span><span class="p">]</span></span>
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1187
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<pre style="margin: 0;">-<span id="LC1187" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inaccessible_rhss</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">SrcInfo</span><span class="p">]</span></span>
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1188
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<pre style="margin: 0;">-<span id="LC1188" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">redundant_bangs</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="p">[</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="p">]</span></span>
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1075
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<pre style="margin: 0;">+<span id="LC1075" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></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;">-- * Collecting redundancy information</span></span>
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1077
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<pre style="margin: 0;">+<span id="LC1077" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1078
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<pre style="margin: 0;">+<span id="LC1078" class="line" lang="haskell"></span>
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1079
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<pre style="margin: 0;">+<span id="LC1079" class="line" lang="haskell"><span class="cd">-- | The result of redundancy checking:</span></span>
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1080
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<pre style="margin: 0;">+<span id="LC1080" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * RHSs classified as /C/overed, /I/naccessible and /R/edundant</span></span>
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1081
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<pre style="margin: 0;">+<span id="LC1081" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * And redundant /B/ang patterns. See Note [Dead bang patterns].</span></span>
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1082
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<pre style="margin: 0;">+<span id="LC1082" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">CIRB</span></span>
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1083
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<pre style="margin: 0;">+<span id="LC1083" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CIRB</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1084" 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">
1084
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<pre style="margin: 0;">+<span id="LC1084" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">cirb_cov</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">OrdList</span> <span class="kt" style="color: #458; font-weight: 600;">SrcInfo</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Covered clauses</span></span>
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1085
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<pre style="margin: 0;">+<span id="LC1085" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cirb_inacc</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">OrdList</span> <span class="kt" style="color: #458; font-weight: 600;">SrcInfo</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Inaccessible clauses</span></span>
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1086
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<pre style="margin: 0;">+<span id="LC1086" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cirb_red</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">OrdList</span> <span class="kt" style="color: #458; font-weight: 600;">SrcInfo</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Redundant clauses</span></span>
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1087
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<pre style="margin: 0;">+<span id="LC1087" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cirb_bangs</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">OrdList</span> <span class="kt" style="color: #458; font-weight: 600;">SrcInfo</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Redundant bang patterns</span></span>
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1189
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1088
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<pre style="margin: 0;"> <span id="LC1088" class="line" lang="haskell"> <span class="p">}</span></span>
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1190
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1089
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<pre style="margin: 0;"> <span id="LC1089" class="line" lang="haskell"></span>
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1191
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<pre style="margin: 0;">-<span id="LC1191" class="line" lang="haskell"><span class="n" style="color: #333;">extractRedundancyInfo</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;">RedundancyInfo</span></span>
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1192
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<pre style="margin: 0;">-<span id="LC1192" class="line" lang="haskell"><span class="n" style="color: #333;">extractRedundancyInfo</span> <span class="n" style="color: #333;">tree</span> <span class="o" style="font-weight: 600;">=</span></span>
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1193
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<pre style="margin: 0;">-<span id="LC1193" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">RedundancyInfo</span> <span class="p">{</span> <span class="n" style="color: #333;">redundant_rhss</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fromOL</span> <span class="n" style="color: #333;">ol_red</span></span>
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1194
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<pre style="margin: 0;">-<span id="LC1194" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inaccessible_rhss</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fromOL</span> <span class="n" style="color: #333;">ol_inacc</span></span>
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1195
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<pre style="margin: 0;">-<span id="LC1195" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">redundant_bangs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fromOL</span> <span class="n" style="color: #333;">ol_bangs</span> <span class="p">}</span></span>
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1196
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<pre style="margin: 0;">-<span id="LC1196" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1197
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<pre style="margin: 0;">-<span id="LC1197" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">_ol_acc</span><span class="p">,</span> <span class="n" style="color: #333;">ol_inacc</span><span class="p">,</span> <span class="n" style="color: #333;">ol_red</span><span class="p">,</span> <span class="n" style="color: #333;">ol_bangs</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;">tree</span></span>
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1198
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<pre style="margin: 0;">-<span id="LC1198" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | Collects</span></span>
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1199
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<pre style="margin: 0;">-<span id="LC1199" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 1. accessible RHSs</span></span>
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1200
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<pre style="margin: 0;">-<span id="LC1200" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 2. proper inaccessible RHSs (so we can't delete them)</span></span>
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1201
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<pre style="margin: 0;">-<span id="LC1201" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 3. hypothetically redundant RHSs (so not only inaccessible, but we can</span></span>
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1202
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<pre style="margin: 0;">-<span id="LC1202" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- even safely delete the equation without altering semantics)</span></span>
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1203
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<pre style="margin: 0;">-<span id="LC1203" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 4. 'Dead' bangs from the source, collected to be warned about</span></span>
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1204
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<pre style="margin: 0;">-<span id="LC1204" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Determining inaccessible clauses]</span></span>
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1205
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<pre style="margin: 0;">-<span id="LC1205" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Dead bang patterns]</span></span>
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1206
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<pre style="margin: 0;">-<span id="LC1206" class="line" lang="haskell"> <span class="n" style="color: #333;">go</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;">OrdList</span> <span class="kt" style="color: #458; font-weight: 600;">SrcInfo</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">OrdList</span> <span class="kt" style="color: #458; font-weight: 600;">SrcInfo</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">OrdList</span> <span class="kt" style="color: #458; font-weight: 600;">SrcInfo</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">OrdList</span> <span class="kt" style="color: #458; font-weight: 600;">SrcInfo</span><span class="p">)</span></span>
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1207
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<pre style="margin: 0;">-<span id="LC1207" class="line" lang="haskell"> <span class="n" style="color: #333;">go</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="n" style="color: #333;">info</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">unitOL</span> <span class="n" style="color: #333;">info</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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<td class="diff-line-num old old_line" data-linenumber="1208" 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">
1208
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<td class="diff-line-num new_line old" data-linenumber="1090" 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="LC1208" 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="n" style="color: #333;">info</span><span class="p">)</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;">unitOL</span> <span class="n" style="color: #333;">info</span><span class="p">,</span> <span class="n" style="color: #333;">nilOL</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- presumably redundant</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1209" 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">
1209
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<pre style="margin: 0;">-<span id="LC1209" 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="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">t</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1210
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<pre style="margin: 0;">-<span id="LC1210" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Determining inaccessible clauses]</span></span>
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1211
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<pre style="margin: 0;">-<span id="LC1211" 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 class="n" style="color: #333;">bs</span><span class="p">)</span></span>
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1212
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<pre style="margin: 0;">-<span id="LC1212" 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 class="n" style="color: #333;">bs</span><span class="p">)</span></span>
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1213
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<pre style="margin: 0;">-<span id="LC1213" class="line" lang="haskell"> <span class="n" style="color: #333;">res</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">res</span></span>
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1214
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<pre style="margin: 0;">-<span id="LC1214" class="line" lang="haskell"> <span class="n" style="color: #333;">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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<td class="diff-line-num old old_line" 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">
1215
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<pre style="margin: 0;">-<span id="LC1215" 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;">RedundantSrcBang</span> <span class="n" style="color: #333;">l</span> <span class="n" style="color: #333;">t</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;">go</span> <span class="n" style="color: #333;">t</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1216
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<pre style="margin: 0;">-<span id="LC1216" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Dead bang patterns]</span></span>
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1217
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<pre style="margin: 0;">-<span id="LC1217" class="line" lang="haskell"> <span class="n" style="color: #333;">res</span><span class="o" style="font-weight: 600;">@</span><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="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1218" 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">
1218
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<pre style="margin: 0;">-<span id="LC1218" 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="p">,</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="n" style="color: #333;">res</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1219" 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">
1219
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<pre style="margin: 0;">-<span id="LC1219" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">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 class="n" style="color: #333;">unitOL</span> <span class="n" style="color: #333;">l</span><span class="p">)</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;">res</span></span>
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<td class="diff-line-num new old_line" data-linenumber="1220" 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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1090
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<pre style="margin: 0;">+<span id="LC1090" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Semigroup</span> <span class="kt" style="color: #458; font-weight: 600;">CIRB</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1091" 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">
1091
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<pre style="margin: 0;">+<span id="LC1091" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CIRB</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span> <span class="n" style="color: #333;">c</span> <span class="n" style="color: #333;">d</span> <span class="o" style="font-weight: 600;"><></span> <span class="kt" style="color: #458; font-weight: 600;">CIRB</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">g</span> <span class="n" style="color: #333;">h</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CIRB</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;">e</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">f</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">g</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">d</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">h</span><span class="p">)</span></span>
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1092
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<pre style="margin: 0;">+<span id="LC1092" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="p">(</span><span class="o" style="font-weight: 600;"><></span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Semi</span><span class="o" style="font-weight: 600;">.<></span><span class="p">)</span></span>
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1093
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<pre style="margin: 0;">+<span id="LC1093" class="line" lang="haskell"></span>
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1094
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<pre style="margin: 0;">+<span id="LC1094" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Monoid</span> <span class="kt" style="color: #458; font-weight: 600;">CIRB</span> <span class="kr" style="font-weight: 600;">where</span></span>
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1095
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<pre style="margin: 0;">+<span id="LC1095" class="line" lang="haskell"> <span class="n" style="color: #333;">mempty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CIRB</span> <span class="n" style="color: #333;">mempty</span> <span class="n" style="color: #333;">mempty</span> <span class="n" style="color: #333;">mempty</span> <span class="n" style="color: #333;">mempty</span></span>
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1096
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<pre style="margin: 0;">+<span id="LC1096" class="line" lang="haskell"></span>
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1097
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<pre style="margin: 0;">+<span id="LC1097" class="line" lang="haskell"><span class="n" style="color: #333;">markAllRedundant</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CIRB</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CIRB</span></span>
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1098
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<pre style="margin: 0;">+<span id="LC1098" class="line" lang="haskell"><span class="n" style="color: #333;">markAllRedundant</span> <span class="kt" style="color: #458; font-weight: 600;">CIRB</span> <span class="p">{</span> <span class="n" style="color: #333;">cirb_cov</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cov</span><span class="p">,</span> <span class="n" style="color: #333;">cirb_inacc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">inacc</span><span class="p">,</span> <span class="n" style="color: #333;">cirb_red</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">red</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">=</span></span>
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1099
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<pre style="margin: 0;">+<span id="LC1099" class="line" lang="haskell"> <span class="n" style="color: #333;">mempty</span> <span class="p">{</span> <span class="n" style="color: #333;">cirb_red</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cov</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;">inacc</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;">red</span> <span class="p">}</span></span>
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1100
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<pre style="margin: 0;">+<span id="LC1100" class="line" lang="haskell"></span>
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1101
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<pre style="margin: 0;">+<span id="LC1101" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Determining inaccessible clauses]</span></span>
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1102
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<pre style="margin: 0;">+<span id="LC1102" class="line" lang="haskell"><span class="n" style="color: #333;">ensureOneNotRedundant</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CIRB</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CIRB</span></span>
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1103
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<pre style="margin: 0;">+<span id="LC1103" class="line" lang="haskell"><span class="n" style="color: #333;">ensureOneNotRedundant</span> <span class="n" style="color: #333;">ci</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">ci</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1104
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<pre style="margin: 0;">+<span id="LC1104" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CIRB</span> <span class="p">{</span> <span class="n" style="color: #333;">cirb_cov</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NilOL</span><span class="p">,</span> <span class="n" style="color: #333;">cirb_inacc</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NilOL</span><span class="p">,</span> <span class="n" style="color: #333;">cirb_red</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ConsOL</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">rs</span> <span class="p">}</span></span>
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1105
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<pre style="margin: 0;">+<span id="LC1105" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">ci</span> <span class="p">{</span> <span class="n" style="color: #333;">cirb_inacc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unitOL</span> <span class="n" style="color: #333;">r</span><span class="p">,</span> <span class="n" style="color: #333;">cirb_red</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rs</span> <span class="p">}</span></span>
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1106
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<pre style="margin: 0;">+<span id="LC1106" 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;">ci</span></span>
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1107
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<pre style="margin: 0;">+<span id="LC1107" class="line" lang="haskell"></span>
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1108
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<pre style="margin: 0;">+<span id="LC1108" class="line" lang="haskell"><span class="cd">-- | Only adds the redundant bangs to the @CIRB@ if there is at least one</span></span>
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1109
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<pre style="margin: 0;">+<span id="LC1109" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- non-redundant 'SrcInfo'. There is no point in remembering a redundant bang</span></span>
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1110
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<pre style="margin: 0;">+<span id="LC1110" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- if the whole match is redundant!</span></span>
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1111
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<pre style="margin: 0;">+<span id="LC1111" class="line" lang="haskell"><span class="n" style="color: #333;">addRedundantBangs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">OrdList</span> <span class="kt" style="color: #458; font-weight: 600;">SrcInfo</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CIRB</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CIRB</span></span>
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1112
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<pre style="margin: 0;">+<span id="LC1112" class="line" lang="haskell"><span class="n" style="color: #333;">addRedundantBangs</span> <span class="n" style="color: #333;">_red_bangs</span> <span class="n" style="color: #333;">cirb</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">CIRB</span> <span class="p">{</span> <span class="n" style="color: #333;">cirb_cov</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NilOL</span><span class="p">,</span> <span class="n" style="color: #333;">cirb_inacc</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NilOL</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">=</span></span>
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1113
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<pre style="margin: 0;">+<span id="LC1113" class="line" lang="haskell"> <span class="n" style="color: #333;">cirb</span></span>
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1114
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<pre style="margin: 0;">+<span id="LC1114" class="line" lang="haskell"><span class="n" style="color: #333;">addRedundantBangs</span> <span class="n" style="color: #333;">red_bangs</span> <span class="n" style="color: #333;">cirb</span> <span class="o" style="font-weight: 600;">=</span></span>
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1115
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<pre style="margin: 0;">+<span id="LC1115" class="line" lang="haskell"> <span class="n" style="color: #333;">cirb</span> <span class="p">{</span> <span class="n" style="color: #333;">cirb_bangs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cirb_bangs</span> <span class="n" style="color: #333;">cirb</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;">red_bangs</span> <span class="p">}</span></span>
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1116
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<pre style="margin: 0;">+<span id="LC1116" class="line" lang="haskell"></span>
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1117
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<pre style="margin: 0;">+<span id="LC1117" class="line" lang="haskell"><span class="cd">-- | Checks the 'Deltas' in a 'RedSets' for inhabitants and returns</span></span>
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1118
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<pre style="margin: 0;">+<span id="LC1118" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 1. Whether the Covered set was inhabited</span></span>
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1119
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<pre style="margin: 0;">+<span id="LC1119" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 2. Whether the Diverging set was inhabited</span></span>
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1120
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<pre style="margin: 0;">+<span id="LC1120" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 3. All source bangs whose 'Deltas' were empty, which means they are</span></span>
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1121
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<pre style="margin: 0;">+<span id="LC1121" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- redundant.</span></span>
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1122
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<pre style="margin: 0;">+<span id="LC1122" class="line" lang="haskell"><span class="n" style="color: #333;">testRedSets</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">RedSets</span> <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;">Bool</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">OrdList</span> <span class="kt" style="color: #458; font-weight: 600;">SrcInfo</span><span class="p">)</span></span>
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1123
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<pre style="margin: 0;">+<span id="LC1123" class="line" lang="haskell"><span class="n" style="color: #333;">testRedSets</span> <span class="kt" style="color: #458; font-weight: 600;">RedSets</span> <span class="p">{</span> <span class="n" style="color: #333;">rs_cov</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cov</span><span class="p">,</span> <span class="n" style="color: #333;">rs_div</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">div</span><span class="p">,</span> <span class="n" style="color: #333;">rs_bangs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bangs</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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1124
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<pre style="margin: 0;">+<span id="LC1124" class="line" lang="haskell"> <span class="n" style="color: #333;">is_covered</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isInhabited</span> <span class="n" style="color: #333;">cov</span></span>
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1125
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<pre style="margin: 0;">+<span id="LC1125" class="line" lang="haskell"> <span class="n" style="color: #333;">may_diverge</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isInhabited</span> <span class="n" style="color: #333;">div</span></span>
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1126
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<pre style="margin: 0;">+<span id="LC1126" class="line" lang="haskell"> <span class="n" style="color: #333;">red_bangs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">flip</span> <span class="n" style="color: #333;">mapMaybeM</span> <span class="p">(</span><span class="n" style="color: #333;">fromOL</span> <span class="n" style="color: #333;">bangs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">(</span><span class="n" style="color: #333;">deltas</span><span class="p">,</span> <span class="n" style="color: #333;">bang</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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1127
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<pre style="margin: 0;">+<span id="LC1127" class="line" lang="haskell"> <span class="n" style="color: #333;">isInhabited</span> <span class="n" style="color: #333;">deltas</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;">case</span></span>
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1128
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<pre style="margin: 0;">+<span id="LC1128" 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;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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1129
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<pre style="margin: 0;">+<span id="LC1129" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">bang</span><span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1130" 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">
1130
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<pre style="margin: 0;">+<span id="LC1130" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">is_covered</span><span class="p">,</span> <span class="n" style="color: #333;">may_diverge</span><span class="p">,</span> <span class="n" style="color: #333;">toOL</span> <span class="n" style="color: #333;">red_bangs</span><span class="p">)</span></span>
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1131
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<pre style="margin: 0;">+<span id="LC1131" class="line" lang="haskell"></span>
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1132
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<pre style="margin: 0;">+<span id="LC1132" class="line" lang="haskell"><span class="n" style="color: #333;">cirbsMatchGroup</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmMatchGroup</span> <span class="kt" style="color: #458; font-weight: 600;">Post</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;">CIRB</span></span>
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1133
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<pre style="margin: 0;">+<span id="LC1133" class="line" lang="haskell"><span class="n" style="color: #333;">cirbsMatchGroup</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmMatchGroup</span> <span class="n" style="color: #333;">matches</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span></span>
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1134
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<pre style="margin: 0;">+<span id="LC1134" class="line" lang="haskell"> <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;">sconcat</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">traverse</span> <span class="n" style="color: #333;">cirbsMatch</span> <span class="n" style="color: #333;">matches</span></span>
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1135
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<pre style="margin: 0;">+<span id="LC1135" class="line" lang="haskell"></span>
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1136
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<pre style="margin: 0;">+<span id="LC1136" class="line" lang="haskell"><span class="n" style="color: #333;">cirbsMatch</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmMatch</span> <span class="kt" style="color: #458; font-weight: 600;">Post</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;">CIRB</span></span>
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1137
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<pre style="margin: 0;">+<span id="LC1137" class="line" lang="haskell"><span class="n" style="color: #333;">cirbsMatch</span> <span class="kt" style="color: #458; font-weight: 600;">PmMatch</span> <span class="p">{</span> <span class="n" style="color: #333;">pm_pats</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">red</span><span class="p">,</span> <span class="n" style="color: #333;">pm_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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1138
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<pre style="margin: 0;">+<span id="LC1138" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">is_covered</span><span class="p">,</span> <span class="n" style="color: #333;">may_diverge</span><span class="p">,</span> <span class="n" style="color: #333;">red_bangs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">testRedSets</span> <span class="n" style="color: #333;">red</span></span>
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1139
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<pre style="margin: 0;">+<span id="LC1139" class="line" lang="haskell"> <span class="n" style="color: #333;">cirb</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">cirbsGRHSs</span> <span class="n" style="color: #333;">grhss</span></span>
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1140
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<pre style="margin: 0;">+<span id="LC1140" 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;">addRedundantBangs</span> <span class="n" style="color: #333;">red_bangs</span></span>
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1141
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<pre style="margin: 0;">+<span id="LC1141" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Determining inaccessible clauses]</span></span>
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1142
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<pre style="margin: 0;">+<span id="LC1142" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">applyWhen</span> <span class="n" style="color: #333;">may_diverge</span> <span class="n" style="color: #333;">ensureOneNotRedundant</span></span>
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1143
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<pre style="margin: 0;">+<span id="LC1143" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">applyWhen</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">is_covered</span><span class="p">)</span> <span class="n" style="color: #333;">markAllRedundant</span></span>
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1144
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<pre style="margin: 0;">+<span id="LC1144" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">cirb</span></span>
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1145
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<pre style="margin: 0;">+<span id="LC1145" class="line" lang="haskell"></span>
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1146
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<pre style="margin: 0;">+<span id="LC1146" class="line" lang="haskell"><span class="n" style="color: #333;">cirbsGRHSs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmGRHS</span> <span class="kt" style="color: #458; font-weight: 600;">Post</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">CIRB</span></span>
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1147
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<pre style="margin: 0;">+<span id="LC1147" class="line" lang="haskell"><span class="n" style="color: #333;">cirbsGRHSs</span> <span class="n" style="color: #333;">grhss</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Semi</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">sconcat</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">traverse</span> <span class="n" style="color: #333;">cirbsGRHS</span> <span class="n" style="color: #333;">grhss</span></span>
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1148
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<pre style="margin: 0;">+<span id="LC1148" class="line" lang="haskell"></span>
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1149
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<pre style="margin: 0;">+<span id="LC1149" class="line" lang="haskell"><span class="n" style="color: #333;">cirbsGRHS</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmGRHS</span> <span class="kt" style="color: #458; font-weight: 600;">Post</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;">CIRB</span></span>
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1150
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<pre style="margin: 0;">+<span id="LC1150" class="line" lang="haskell"><span class="n" style="color: #333;">cirbsGRHS</span> <span class="kt" style="color: #458; font-weight: 600;">PmGRHS</span> <span class="p">{</span> <span class="n" style="color: #333;">pg_grds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">red</span><span class="p">,</span> <span class="n" style="color: #333;">pg_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">info</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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1151
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<pre style="margin: 0;">+<span id="LC1151" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">is_covered</span><span class="p">,</span> <span class="n" style="color: #333;">may_diverge</span><span class="p">,</span> <span class="n" style="color: #333;">red_bangs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">testRedSets</span> <span class="n" style="color: #333;">red</span></span>
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1152
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<pre style="margin: 0;">+<span id="LC1152" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">cirb</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">is_covered</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mempty</span> <span class="p">{</span> <span class="n" style="color: #333;">cirb_cov</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unitOL</span> <span class="n" style="color: #333;">info</span> <span class="p">}</span></span>
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1153
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<pre style="margin: 0;">+<span id="LC1153" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">may_diverge</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mempty</span> <span class="p">{</span> <span class="n" style="color: #333;">cirb_inacc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unitOL</span> <span class="n" style="color: #333;">info</span> <span class="p">}</span></span>
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1154
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<pre style="margin: 0;">+<span id="LC1154" 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;">mempty</span> <span class="p">{</span> <span class="n" style="color: #333;">cirb_red</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unitOL</span> <span class="n" style="color: #333;">info</span> <span class="p">}</span></span>
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1155
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<pre style="margin: 0;">+<span id="LC1155" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">addRedundantBangs</span> <span class="n" style="color: #333;">red_bangs</span> <span class="n" style="color: #333;">cirb</span><span class="p">)</span></span>
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1156
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<pre style="margin: 0;">+<span id="LC1156" class="line" lang="haskell"></span>
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1157
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<pre style="margin: 0;">+<span id="LC1157" class="line" lang="haskell"><span class="n" style="color: #333;">cirbsEmptyCase</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmEmptyCase</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;">CIRB</span></span>
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1158
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<pre style="margin: 0;">+<span id="LC1158" class="line" lang="haskell"><span class="n" style="color: #333;">cirbsEmptyCase</span> <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;">mempty</span></span>
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1159
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<pre style="margin: 0;">+<span id="LC1159" class="line" lang="haskell"></span>
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1160
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<pre style="margin: 0;">+<span id="LC1160" class="line" lang="haskell"><span class="n" style="color: #333;">cirbsPatBind</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmPatBind</span> <span class="kt" style="color: #458; font-weight: 600;">Post</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;">CIRB</span></span>
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1161
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<pre style="margin: 0;">+<span id="LC1161" class="line" lang="haskell"><span class="n" style="color: #333;">cirbsPatBind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">coerce</span> <span class="n" style="color: #333;">cirbsGRHS</span></span>
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1220
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1162
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<pre style="margin: 0;"> <span id="LC1162" class="line" lang="haskell"></span>
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1221
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1163
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<pre style="margin: 0;"> <span id="LC1163" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Determining inaccessible clauses]</span></span>
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1222
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1164
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<pre style="margin: 0;"> <span id="LC1164" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1231" 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="1173" 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">@@ -1231,26 +1173,29 @@ arguments we can ever reach clause 2's RHS, so we say it has inaccessible RHS</td>
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1231
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1173
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<pre style="margin: 0;"> <span id="LC1173" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(as opposed to being completely redundant).</span></span>
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1232
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1174
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<pre style="margin: 0;"> <span id="LC1174" class="line" lang="haskell"></span>
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1233
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1175
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<pre style="margin: 0;"> <span id="LC1175" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We detect an inaccessible RHS simply by pretending it's redundant, until we see</span></span>
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1234
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<pre style="margin: 0;">-<span id="LC1234" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that it's part of a sub-tree in the pattern match that forces some argument</span></span>
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1235
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<pre style="margin: 0;">-<span id="LC1235" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(which corresponds to wrapping the 'AnnotatedTree' in 'MayDiverge'). Then we</span></span>
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1236
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<pre style="margin: 0;">-<span id="LC1236" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">turn all supposedly redundant RHSs into inaccessible ones.</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;">But as it turns out (@g@ from #17465) this is too conservative:</span></span>
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1239
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<pre style="margin: 0;">-<span id="LC1239" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g () | False = ()</span></span>
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1240
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<pre style="margin: 0;">-<span id="LC1240" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | otherwise = ()</span></span>
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1241
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<pre style="margin: 0;">-<span id="LC1241" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">g's first clause has an inaccessible RHS, but it's also safe to delete. So it's</span></span>
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1242
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<pre style="margin: 0;">-<span id="LC1242" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">redundant, really! But by just turning all redundant child clauses into</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;">inaccessible ones, we report the first clause as inaccessible.</span></span>
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1244
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<pre style="margin: 0;">-<span id="LC1244" class="line" lang="haskell"></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;">Clearly, it is enough if we say that we only degrade if *not all* of the child</span></span>
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1246
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<pre style="margin: 0;">-<span id="LC1246" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">clauses are redundant. As long as there is at least one clause which we announce</span></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;">not to be redundant, the guard prefix responsible for the 'MayDiverge' will</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;">survive. Hence we check for that in 'extractRedundancyInfo'.</span></span>
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1249
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1176
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<pre style="margin: 0;"> <span id="LC1176" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1250
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1177
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<pre style="margin: 0;"> <span id="LC1177" class="line" lang="haskell"></span>
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1251
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<pre style="margin: 0;">-<span id="LC1251" class="line" lang="haskell"><span class="cd">-- | Issue all the warnings (coverage, exhaustiveness, inaccessibility)</span></span>
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1252
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<pre style="margin: 0;">-<span id="LC1252" class="line" lang="haskell"><span class="n" style="color: #333;">dsPmWarn</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsMatchContext</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;">CheckResult</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1253
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<pre style="margin: 0;">-<span id="LC1253" 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;">ctx</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DsMatchContext</span> <span class="n" style="color: #333;">kind</span> <span class="n" style="color: #333;">loc</span><span class="p">)</span> <span class="n" style="color: #333;">vars</span> <span class="n" style="color: #333;">result</span></span>
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1178
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<pre style="margin: 0;">+<span id="LC1178" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1179
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<pre style="margin: 0;">+<span id="LC1179" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Formatting and reporting warnings</span></span>
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1180
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<pre style="margin: 0;">+<span id="LC1180" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1181
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<pre style="margin: 0;">+<span id="LC1181" class="line" lang="haskell"></span>
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1182
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<pre style="margin: 0;">+<span id="LC1182" class="line" lang="haskell"><span class="cd">-- | Given a function that collects 'CIRB's, this function will emit warnings</span></span>
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1183
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<pre style="margin: 0;">+<span id="LC1183" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- for a 'CheckResult'.</span></span>
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1184
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<pre style="margin: 0;">+<span id="LC1184" class="line" lang="haskell"><span class="n" style="color: #333;">formatReportWarnings</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="n" style="color: #333;">ann</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;">CIRB</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsMatchContext</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;">CheckResult</span> <span class="n" style="color: #333;">ann</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1185
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<pre style="margin: 0;">+<span id="LC1185" class="line" lang="haskell"><span class="n" style="color: #333;">formatReportWarnings</span> <span class="n" style="color: #333;">collect</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;">vars</span> <span class="n" style="color: #333;">cr</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">CheckResult</span> <span class="p">{</span> <span class="n" style="color: #333;">cr_ret</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ann</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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1186
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<pre style="margin: 0;">+<span id="LC1186" class="line" lang="haskell"> <span class="n" style="color: #333;">cov_info</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">collect</span> <span class="n" style="color: #333;">ann</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1187" 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">
1187
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<pre style="margin: 0;">+<span id="LC1187" 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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1188
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<pre style="margin: 0;">+<span id="LC1188" class="line" lang="haskell"> <span class="n" style="color: #333;">reportWarnings</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;">vars</span> <span class="n" style="color: #333;">cr</span><span class="p">{</span><span class="n" style="color: #333;">cr_ret</span><span class="o" style="font-weight: 600;">=</span><span class="n" style="color: #333;">cov_info</span><span class="p">}</span></span>
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1189
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<pre style="margin: 0;">+<span id="LC1189" class="line" lang="haskell"></span>
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1190
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<pre style="margin: 0;">+<span id="LC1190" class="line" lang="haskell"><span class="cd">-- | Issue all the warnings</span></span>
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1191
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<pre style="margin: 0;">+<span id="LC1191" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (redundancy, inaccessibility, exhaustiveness, redundant bangs).</span></span>
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1192
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<pre style="margin: 0;">+<span id="LC1192" class="line" lang="haskell"><span class="n" style="color: #333;">reportWarnings</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsMatchContext</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;">CheckResult</span> <span class="kt" style="color: #458; font-weight: 600;">CIRB</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1193
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<pre style="margin: 0;">+<span id="LC1193" class="line" lang="haskell"><span class="n" style="color: #333;">reportWarnings</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">ctx</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DsMatchContext</span> <span class="n" style="color: #333;">kind</span> <span class="n" style="color: #333;">loc</span><span class="p">)</span> <span class="n" style="color: #333;">vars</span></span>
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1194
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<pre style="margin: 0;">+<span id="LC1194" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CheckResult</span> <span class="p">{</span> <span class="n" style="color: #333;">cr_ret</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CIRB</span> <span class="p">{</span> <span class="n" style="color: #333;">cirb_inacc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">inaccessible_rhss</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1195" 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">
1195
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<pre style="margin: 0;">+<span id="LC1195" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cirb_red</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">redundant_rhss</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1196" 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">
1196
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<pre style="margin: 0;">+<span id="LC1196" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cirb_bangs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">redundant_bangs</span> <span class="p">}</span></span>
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1197
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<pre style="margin: 0;">+<span id="LC1197" 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;">uncovered</span></span>
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1198
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<pre style="margin: 0;">+<span id="LC1198" 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;">precision</span> <span class="p">}</span></span>
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1254
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1199
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<pre style="margin: 0;"> <span id="LC1199" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">flag_i</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">flag_u</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">flag_b</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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1255
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1200
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<pre style="margin: 0;"> <span id="LC1200" class="line" lang="haskell"> <span class="n" style="color: #333;">unc_examples</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getNFirstUncovered</span> <span class="n" style="color: #333;">vars</span> <span class="p">(</span><span class="n" style="color: #333;">maxPatterns</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;">uncovered</span></span>
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1256
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1201
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<pre style="margin: 0;"> <span id="LC1201" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">exists_r</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">flag_i</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">notNull</span> <span class="n" style="color: #333;">redundant_rhss</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1221" 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">@@ -1276,13 +1221,6 @@ dsPmWarn dflags ctx@(DsMatchContext kind loc) vars result</td>
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1276
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1221
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<pre style="margin: 0;"> <span id="LC1221" class="line" lang="haskell"> <span class="n" style="color: #333;">when</span> <span class="n" style="color: #333;">exists_u</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">putSrcSpanDs</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">warnDs</span> <span class="n" style="color: #333;">flag_u_reason</span> <span class="o" style="font-weight: 600;">$</span></span>
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1277
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1222
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<pre style="margin: 0;"> <span id="LC1222" class="line" lang="haskell"> <span class="n" style="color: #333;">pprEqns</span> <span class="n" style="color: #333;">vars</span> <span class="n" style="color: #333;">unc_examples</span></span>
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1278
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1223
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<pre style="margin: 0;"> <span id="LC1223" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1279
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<pre style="margin: 0;">-<span id="LC1279" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CheckResult</span></span>
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1280
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<pre style="margin: 0;">-<span id="LC1280" 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="n" style="color: #333;">clauses</span></span>
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1281
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<pre style="margin: 0;">-<span id="LC1281" 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;">uncovered</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1282" 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">
1282
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<pre style="margin: 0;">-<span id="LC1282" 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;">precision</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">result</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1283" 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">
1283
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<pre style="margin: 0;">-<span id="LC1283" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">RedundancyInfo</span><span class="p">{</span><span class="n" style="color: #333;">redundant_rhss</span><span class="p">,</span> <span class="n" style="color: #333;">inaccessible_rhss</span><span class="p">,</span> <span class="n" style="color: #333;">redundant_bangs</span><span class="p">}</span></span>
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1284
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<pre style="margin: 0;">-<span id="LC1284" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extractRedundancyInfo</span> <span class="n" style="color: #333;">clauses</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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1286
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1224
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<pre style="margin: 0;"> <span id="LC1224" class="line" lang="haskell"> <span class="n" style="color: #333;">flag_i</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">overlapping</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">kind</span></span>
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1287
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1225
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<pre style="margin: 0;"> <span id="LC1225" class="line" lang="haskell"> <span class="n" style="color: #333;">flag_u</span> <span class="o" style="font-weight: 600;">=</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>
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1288
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1226
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<pre style="margin: 0;"> <span id="LC1226" class="line" lang="haskell"> <span class="n" style="color: #333;">flag_b</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">redundant_bang</span> <span class="n" style="color: #333;">dflags</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1323" 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="1261" 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">@@ -1323,44 +1261,30 @@ getNFirstUncovered vars n (MkDeltas deltas) = go n (bagToList deltas)</td>
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1323
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1261
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<pre style="margin: 0;"> <span id="LC1261" class="line" lang="haskell"> <span class="n" style="color: #333;">back</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">-</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">front</span><span class="p">)</span> <span class="n" style="color: #333;">deltas</span></span>
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1324
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1262
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<pre style="margin: 0;"> <span id="LC1262" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">front</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">back</span><span class="p">)</span></span>
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1325
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1263
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<pre style="margin: 0;"> <span id="LC1263" class="line" lang="haskell"></span>
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1326
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<pre style="margin: 0;">-<span id="LC1326" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Inaccessible warnings for record updates]</span></span>
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1327
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<pre style="margin: 0;">-<span id="LC1327" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1328
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<pre style="margin: 0;">-<span id="LC1328" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider (#12957)</span></span>
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1329
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<pre style="margin: 0;">-<span id="LC1329" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T a where</span></span>
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1330
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<pre style="margin: 0;">-<span id="LC1330" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> T1 :: { x :: Int } -> T Bool</span></span>
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1331
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<pre style="margin: 0;">-<span id="LC1331" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> T2 :: { x :: Int } -> T a</span></span>
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1332
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<pre style="margin: 0;">-<span id="LC1332" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> T3 :: T a</span></span>
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1333
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<pre style="margin: 0;">-<span id="LC1333" class="line" lang="haskell"></span>
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1334
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<pre style="margin: 0;">-<span id="LC1334" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: T Char -> T a</span></span>
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1335
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<pre style="margin: 0;">-<span id="LC1335" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f r = r { x = 3 }</span></span>
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1336
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<pre style="margin: 0;">-<span id="LC1336" class="line" lang="haskell"></span>
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1337
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<pre style="margin: 0;">-<span id="LC1337" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The desugarer will (conservatively generate a case for T1 even though</span></span>
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1338
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<pre style="margin: 0;">-<span id="LC1338" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">it's impossible:</span></span>
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1339
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<td class="diff-line-num new_line old" data-linenumber="1264" 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="LC1339" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f r = case r of</span></span>
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1340
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<pre style="margin: 0;">-<span id="LC1340" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> T1 x -> T1 3 -- Inaccessible branch</span></span>
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1341
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<pre style="margin: 0;">-<span id="LC1341" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> T2 x -> T2 3</span></span>
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1342
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<pre style="margin: 0;">-<span id="LC1342" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> _ -> error "Missing"</span></span>
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1343
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<pre style="margin: 0;">-<span id="LC1343" class="line" lang="haskell"></span>
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1344
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<pre style="margin: 0;">-<span id="LC1344" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We don't want to warn about the inaccessible branch because the programmer</span></span>
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1345
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<pre style="margin: 0;">-<span id="LC1345" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">didn't put it there! So we filter out the warning here.</span></span>
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1346
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<pre style="margin: 0;">-<span id="LC1346" class="line" lang="haskell"></span>
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1347
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<pre style="margin: 0;">-<span id="LC1347" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The same can happen for long distance term constraints instead of type</span></span>
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1348
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<pre style="margin: 0;">-<span id="LC1348" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">constraints (#17783):</span></span>
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1349
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<pre style="margin: 0;">-<span id="LC1349" class="line" lang="haskell"></span>
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1350
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<pre style="margin: 0;">-<span id="LC1350" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T = A { x :: Int } | B { x :: Int }</span></span>
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1351
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<pre style="margin: 0;">-<span id="LC1351" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f r@A{} = r { x = 3 }</span></span>
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1352
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<pre style="margin: 0;">-<span id="LC1352" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f _ = B 0</span></span>
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1353
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<pre style="margin: 0;">-<span id="LC1353" class="line" lang="haskell"></span>
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1354
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<td class="diff-line-num new_line old" data-linenumber="1264" 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="LC1354" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here, the long distance info from the FunRhs match (@r ~ A x@) will make the</span></span>
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1355
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<pre style="margin: 0;">-<span id="LC1355" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">clause matching on @B@ of the desugaring to @case@ redundant. It's generated</span></span>
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1356
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<pre style="margin: 0;">-<span id="LC1356" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">code that we don't want to warn about.</span></span>
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1357
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<pre style="margin: 0;">-<span id="LC1357" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1358
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<pre style="margin: 0;">-<span id="LC1358" class="line" lang="haskell"></span>
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1359
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1264
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<pre style="margin: 0;"> <span id="LC1264" class="line" lang="haskell"><span class="n" style="color: #333;">dots</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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1360
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1265
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<pre style="margin: 0;"> <span id="LC1265" class="line" lang="haskell"><span class="n" style="color: #333;">dots</span> <span class="n" style="color: #333;">maxPatterns</span> <span class="n" style="color: #333;">qs</span></span>
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1361
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<td class="diff-line-num new_line" data-linenumber="1266" 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">
1266
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<pre style="margin: 0;"> <span id="LC1266" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">qs</span> <span class="p">`</span><span class="n" style="color: #333;">lengthExceeds</span><span class="p">`</span> <span class="n" style="color: #333;">maxPatterns</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"..."</span></span>
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1362
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<td class="diff-line-num new_line" data-linenumber="1267" 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">
1267
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<pre style="margin: 0;"> <span id="LC1267" 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;">empty</span></span>
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1363
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1268
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<pre style="margin: 0;"> <span id="LC1268" class="line" lang="haskell"></span>
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1269
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<pre style="margin: 0;">+<span id="LC1269" class="line" lang="haskell"><span class="n" style="color: #333;">pprContext</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;">DsMatchContext</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="p">((</span><span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">)</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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1270
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<pre style="margin: 0;">+<span id="LC1270" class="line" lang="haskell"><span class="n" style="color: #333;">pprContext</span> <span class="n" style="color: #333;">singular</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DsMatchContext</span> <span class="n" style="color: #333;">kind</span> <span class="n" style="color: #333;">_loc</span><span class="p">)</span> <span class="n" style="color: #333;">msg</span> <span class="n" style="color: #333;">rest_of_msg_fun</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1271" 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">
1271
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<pre style="margin: 0;">+<span id="LC1271" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span><span class="n" style="color: #333;">text</span> <span class="n" style="color: #333;">txt</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">msg</span><span class="p">,</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1272" 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">
1272
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<pre style="margin: 0;">+<span id="LC1272" class="line" lang="haskell"> <span class="n" style="color: #333;">sep</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"In"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr_match</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>
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1273
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<pre style="margin: 0;">+<span id="LC1273" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">nest</span> <span class="mi" style="color: #099;">4</span> <span class="p">(</span><span class="n" style="color: #333;">rest_of_msg_fun</span> <span class="n" style="color: #333;">pref</span><span class="p">)]]</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1274" 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">
1274
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<pre style="margin: 0;">+<span id="LC1274" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1275
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<pre style="margin: 0;">+<span id="LC1275" class="line" lang="haskell"> <span class="n" style="color: #333;">txt</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">singular</span> <span class="o" style="font-weight: 600;">=</span> <span class="s" style="color: #d14;">"Pattern match"</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1276" 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">
1276
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<pre style="margin: 0;">+<span id="LC1276" 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="s" style="color: #d14;">"Pattern match(es)"</span></span>
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1277
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<pre style="margin: 0;">+<span id="LC1277" class="line" lang="haskell"></span>
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1278
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<pre style="margin: 0;">+<span id="LC1278" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ppr_match</span><span class="p">,</span> <span class="n" style="color: #333;">pref</span><span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1279" 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">
1279
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<pre style="margin: 0;">+<span id="LC1279" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">kind</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1280
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<pre style="margin: 0;">+<span id="LC1280" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">FunRhs</span> <span class="p">{</span> <span class="n" style="color: #333;">mc_fun</span> <span class="o" style="font-weight: 600;">=</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;">fun</span> <span class="p">}</span></span>
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1281
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<pre style="margin: 0;">+<span id="LC1281" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">pprMatchContext</span> <span class="n" style="color: #333;">kind</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">pp</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fun</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pp</span><span class="p">)</span></span>
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1282
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<pre style="margin: 0;">+<span id="LC1282" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">pprMatchContext</span> <span class="n" style="color: #333;">kind</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">pp</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pp</span><span class="p">)</span></span>
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1283
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<pre style="margin: 0;">+<span id="LC1283" class="line" lang="haskell"></span>
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1284
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<pre style="margin: 0;">+<span id="LC1284" class="line" lang="haskell"><span class="c1" 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 class="c1" style="color: #998; font-style: italic;">-- * Utilities</span></span>
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1286
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<pre style="margin: 0;">+<span id="LC1286" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1287
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<pre style="margin: 0;">+<span id="LC1287" class="line" lang="haskell"></span>
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1364
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1288
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<pre style="margin: 0;"> <span id="LC1288" class="line" lang="haskell"><span class="cd">-- | All warning flags that need to run the pattern match checker.</span></span>
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1365
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1289
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<pre style="margin: 0;"> <span id="LC1289" class="line" lang="haskell"><span class="n" style="color: #333;">allPmCheckWarnings</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">WarningFlag</span><span class="p">]</span></span>
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1366
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1290
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<pre style="margin: 0;"> <span id="LC1290" class="line" lang="haskell"><span class="n" style="color: #333;">allPmCheckWarnings</span> <span class="o" style="font-weight: 600;">=</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1399" 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="1323" 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">@@ -1399,23 +1323,142 @@ exhaustiveWarningFlag RecUpd = Just Opt_WarnIncompletePatternsRecUpd</td>
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1399
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1323
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<pre style="margin: 0;"> <span id="LC1323" class="line" lang="haskell"><span class="n" style="color: #333;">exhaustiveWarningFlag</span> <span class="kt" style="color: #458; font-weight: 600;">ThPatSplice</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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1400
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1324
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<pre style="margin: 0;"> <span id="LC1324" class="line" lang="haskell"><span class="n" style="color: #333;">exhaustiveWarningFlag</span> <span class="kt" style="color: #458; font-weight: 600;">PatSyn</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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1401
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1325
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<pre style="margin: 0;"> <span id="LC1325" class="line" lang="haskell"><span class="n" style="color: #333;">exhaustiveWarningFlag</span> <span class="kt" style="color: #458; font-weight: 600;">ThPatQuote</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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1402
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<pre style="margin: 0;">-<span id="LC1402" class="line" lang="haskell"><span class="n" style="color: #333;">exhaustiveWarningFlag</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StmtCtxt</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 class="c1" style="color: #998; font-style: italic;">-- Don't warn about incomplete patterns</span></span>
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1403
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<pre style="margin: 0;">-<span id="LC1403" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in list comprehensions, pattern guards</span></span>
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1404
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<pre style="margin: 0;">-<span id="LC1404" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- etc. They are often *supposed* to be</span></span>
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1405
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<pre style="margin: 0;">-<span id="LC1405" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- incomplete</span></span>
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1326
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<pre style="margin: 0;">+<span id="LC1326" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Don't warn about incomplete patterns in list comprehensions, pattern guards</span></span>
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1327
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<pre style="margin: 0;">+<span id="LC1327" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- etc. They are often *supposed* to be incomplete</span></span>
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1328
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<pre style="margin: 0;">+<span id="LC1328" class="line" lang="haskell"><span class="n" style="color: #333;">exhaustiveWarningFlag</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StmtCtxt</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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1406
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1329
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<pre style="margin: 0;"> <span id="LC1329" class="line" lang="haskell"></span>
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1407
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<pre style="margin: 0;">-<span id="LC1407" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">True <==> singular</span></span></span>
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1408
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<pre style="margin: 0;">-<span id="LC1408" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">pprContext</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">Bool</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">DsMatchContext</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">SDoc</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">SDoc</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">SDoc</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">SDoc</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 right">SDoc</span></span></span>
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1409
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<pre style="margin: 0;">-<span id="LC1409" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">pprContext</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">singular</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">DsMatchContext</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">kind</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">_loc</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">msg</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">rest_of_msg_fun</span></span></span>
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1410
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<pre style="margin: 0;">-<span id="LC1410" 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="n" style="color: #333;"><span class="idiff">vcat</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="n" style="color: #333;"><span class="idiff">text</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">txt</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">msg</span></span><span class="p"><span class="idiff right">,</span></span></span>
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1411
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<pre style="margin: 0;">-<span id="LC1411" class="line" lang="haskell"><span class="idiff left"> </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="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">text</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"In"</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_match</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">char</span></span><span class="idiff"> </span><span class="sc" style="color: #d14;"><span class="idiff right">':'</span></span></span>
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1412
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<pre style="margin: 0;">-<span id="LC1412" class="line" lang="haskell"> <span class="idiff left"> </span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">nest</span></span><span class="idiff"> </span><span class="mi" style="color: #099;"><span class="idiff">4</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">rest_of_msg_fun</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pref</span></span><span class="p"><span class="idiff right">)]]</span></span></span>
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1413
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<pre style="margin: 0;">-<span id="LC1413" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;"><span class="idiff left right">wher</span>e</span></span>
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1414
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<pre style="margin: 0;">-<span id="LC1414" class="line" lang="haskell"> <span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff">txt</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">singular</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff right">"Pattern match"</span></span></span>
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1415
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<pre style="margin: 0;">-<span id="LC1415" 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="n" style="color: #333;"><span class="idiff">otherwise</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff right">"Pattern match(es)"</span></span></span>
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1330
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<pre style="margin: 0;">+<span id="LC1330" class="line" lang="haskell"><span class="cd">-- <span class="idiff left right">| Check whether any part of pattern match checking is enabled for this</span></span></span>
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1331
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<pre style="margin: 0;">+<span id="LC1331" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">-- 'HsMatchContext' (does not matter whether it is the redundancy check or the</span></span></span>
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1332
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<pre style="margin: 0;">+<span id="LC1332" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">-- exhaustiveness check).</span></span></span>
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1333
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<pre style="margin: 0;">+<span id="LC1333" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">isMatchContextPmChecked</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">DynFlags</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Origin</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">HsMatchContext</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">id</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Bool</span></span></span>
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<td class="diff-line-num new new_line" data-linenumber="1334" 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">
1334
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<pre style="margin: 0;">+<span id="LC1334" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">isMatchContextPmChecked</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">dflags</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">origin</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">kind</span></span></span>
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<td class="diff-line-num new new_line" data-linenumber="1335" 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">
1335
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<pre style="margin: 0;">+<span id="LC1335" class="line" lang="haskell"> <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">isGenerated</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">origin</span></span></span>
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<td class="diff-line-num new new_line" data-linenumber="1336" 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">
1336
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<pre style="margin: 0;">+<span id="LC1336" 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">Fals</span>e</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1337" 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">
1337
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<pre style="margin: 0;">+<span id="LC1337" class="line" lang="haskell"> <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">otherwise</span></span></span>
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<td class="diff-line-num new new_line" data-linenumber="1338" 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">
1338
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<pre style="margin: 0;">+<span id="LC1338" class="line" lang="haskell"> <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">overlapping</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">dflags</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">kind</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">exhaustive</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">dflags</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">kind</span></span></span>
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<pre style="margin: 0;"> <span id="LC1339" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1417" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ppr_match</span><span class="p">,</span> <span class="n" style="color: #333;">pref</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1418" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">kind</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC1419" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">FunRhs</span> <span class="p">{</span> <span class="n" style="color: #333;">mc_fun</span> <span class="o" style="font-weight: 600;">=</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;">fun</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC1420" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">pprMatchContext</span> <span class="n" style="color: #333;">kind</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">pp</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fun</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pp</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1421" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">pprMatchContext</span> <span class="n" style="color: #333;">kind</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">pp</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pp</span><span class="p">)</span></span></pre>
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<pre style="margin: 0;">+<span id="LC1340" class="line" lang="haskell"><span class="cd">-- | Return True when any of the pattern match warnings ('allPmCheckWarnings')</span></span>
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1341
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<pre style="margin: 0;">+<span id="LC1341" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- are enabled, in which case we need to run the pattern match checker.</span></span>
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1342
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<pre style="margin: 0;">+<span id="LC1342" class="line" lang="haskell"><span class="n" style="color: #333;">needToRunPmCheck</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Origin</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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1343
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<pre style="margin: 0;">+<span id="LC1343" class="line" lang="haskell"><span class="n" style="color: #333;">needToRunPmCheck</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">origin</span></span>
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1344
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<pre style="margin: 0;">+<span id="LC1344" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isGenerated</span> <span class="n" style="color: #333;">origin</span></span>
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<pre style="margin: 0;">+<span id="LC1345" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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1346
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<pre style="margin: 0;">+<span id="LC1346" 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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1347
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<pre style="margin: 0;">+<span id="LC1347" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">notNull</span> <span class="p">(</span><span class="n" style="color: #333;">filter</span> <span class="p">(`</span><span class="n" style="color: #333;">wopt</span><span class="p">`</span> <span class="n" style="color: #333;">dflags</span><span class="p">)</span> <span class="n" style="color: #333;">allPmCheckWarnings</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1348" class="line" lang="haskell"></span>
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1349
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<pre style="margin: 0;">+<span id="LC1349" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Inaccessible warnings for record updates]</span></span>
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1350
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<pre style="margin: 0;">+<span id="LC1350" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1351
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<pre style="margin: 0;">+<span id="LC1351" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider (#12957)</span></span>
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1352
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<pre style="margin: 0;">+<span id="LC1352" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T a where</span></span>
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1353
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<pre style="margin: 0;">+<span id="LC1353" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> T1 :: { x :: Int } -> T Bool</span></span>
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<pre style="margin: 0;">+<span id="LC1354" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> T2 :: { x :: Int } -> T a</span></span>
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1355
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<pre style="margin: 0;">+<span id="LC1355" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> T3 :: T a</span></span>
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1356
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<pre style="margin: 0;">+<span id="LC1356" class="line" lang="haskell"></span>
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1357
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<pre style="margin: 0;">+<span id="LC1357" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: T Char -> T a</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1358" 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">
1358
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<pre style="margin: 0;">+<span id="LC1358" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f r = r { x = 3 }</span></span>
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1359
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<pre style="margin: 0;">+<span id="LC1359" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="1360" 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">
1360
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<pre style="margin: 0;">+<span id="LC1360" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The desugarer will conservatively generate a case for T1 even though</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1361" 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">
1361
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<pre style="margin: 0;">+<span id="LC1361" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">it's impossible:</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1362" 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">
1362
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<pre style="margin: 0;">+<span id="LC1362" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f r = case r of</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1363" 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">
1363
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<pre style="margin: 0;">+<span id="LC1363" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> T1 x -> T1 3 -- Inaccessible branch</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1364" 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">
1364
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<pre style="margin: 0;">+<span id="LC1364" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> T2 x -> T2 3</span></span>
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1365
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<pre style="margin: 0;">+<span id="LC1365" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> _ -> error "Missing"</span></span>
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1366
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<pre style="margin: 0;">+<span id="LC1366" class="line" lang="haskell"></span>
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<td class="diff-line-num new new_line" data-linenumber="1367" 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">
1367
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<pre style="margin: 0;">+<span id="LC1367" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We don't want to warn about the inaccessible branch because the programmer</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1368" 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">
1368
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<pre style="margin: 0;">+<span id="LC1368" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">didn't put it there! So we filter out the warning here.</span></span>
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1369
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<pre style="margin: 0;">+<span id="LC1369" class="line" lang="haskell"></span>
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1370
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<pre style="margin: 0;">+<span id="LC1370" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The same can happen for long distance term constraints instead of type</span></span>
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1371
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<pre style="margin: 0;">+<span id="LC1371" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">constraints (#17783):</span></span>
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1372
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<pre style="margin: 0;">+<span id="LC1372" class="line" lang="haskell"></span>
</pre>
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1373
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<pre style="margin: 0;">+<span id="LC1373" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T = A { x :: Int } | B { x :: Int }</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1374" 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">
1374
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<pre style="margin: 0;">+<span id="LC1374" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f r@A{} = r { x = 3 }</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1375" 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">
1375
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<pre style="margin: 0;">+<span id="LC1375" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f _ = B 0</span></span>
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1376
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<pre style="margin: 0;">+<span id="LC1376" class="line" lang="haskell"></span>
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<td class="diff-line-num new new_line" data-linenumber="1377" 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">
1377
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<pre style="margin: 0;">+<span id="LC1377" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here, the long distance info from the FunRhs match (@r ~ A x@) will make the</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1378" 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">
1378
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<pre style="margin: 0;">+<span id="LC1378" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">clause matching on @B@ of the desugaring to @case@ redundant. It's generated</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1379" 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">
1379
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<pre style="margin: 0;">+<span id="LC1379" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">code that we don't want to warn about.</span></span>
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1380
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<pre style="margin: 0;">+<span id="LC1380" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1381
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<pre style="margin: 0;">+<span id="LC1381" class="line" lang="haskell"></span>
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1382
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<pre style="margin: 0;">+<span id="LC1382" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1383
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<pre style="margin: 0;">+<span id="LC1383" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Long-distance information</span></span>
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1384
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<pre style="margin: 0;">+<span id="LC1384" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1385
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<pre style="margin: 0;">+<span id="LC1385" class="line" lang="haskell"></span>
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1386
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<pre style="margin: 0;">+<span id="LC1386" class="line" lang="haskell"><span class="cd">-- | Locally update 'dsl_deltas' with the given action, but defer evaluation</span></span>
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1387
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<pre style="margin: 0;">+<span id="LC1387" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- with 'unsafeInterleaveM' in order not to do unnecessary work.</span></span>
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1388
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<pre style="margin: 0;">+<span id="LC1388" class="line" lang="haskell"><span class="n" style="color: #333;">locallyExtendPmDeltas</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="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 class="p">)</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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1389
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<pre style="margin: 0;">+<span id="LC1389" class="line" lang="haskell"><span class="n" style="color: #333;">locallyExtendPmDeltas</span> <span class="n" style="color: #333;">ext</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1390
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<pre style="margin: 0;">+<span id="LC1390" 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;">getLdiDeltas</span></span>
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1391
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<pre style="margin: 0;">+<span id="LC1391" 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;">unsafeInterleaveM</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">ext</span> <span class="n" style="color: #333;">deltas</span></span>
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1392
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<pre style="margin: 0;">+<span id="LC1392" class="line" lang="haskell"> <span class="n" style="color: #333;">updPmDeltas</span> <span class="n" style="color: #333;">deltas'</span> <span class="n" style="color: #333;">k</span></span>
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1393
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<pre style="margin: 0;">+<span id="LC1393" class="line" lang="haskell"></span>
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1394
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<pre style="margin: 0;">+<span id="LC1394" class="line" lang="haskell"><span class="cd">-- | Add in-scope type constraints if the coverage checker might run and then</span></span>
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1395
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<pre style="margin: 0;">+<span id="LC1395" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- run the given action.</span></span>
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1396
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<pre style="margin: 0;">+<span id="LC1396" class="line" lang="haskell"><span class="n" style="color: #333;">addTyCs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Origin</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="kt" style="color: #458; font-weight: 600;">EvVar</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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1397
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<pre style="margin: 0;">+<span id="LC1397" class="line" lang="haskell"><span class="n" style="color: #333;">addTyCs</span> <span class="n" style="color: #333;">origin</span> <span class="n" style="color: #333;">ev_vars</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1398
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<pre style="margin: 0;">+<span id="LC1398" 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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1399
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<pre style="margin: 0;">+<span id="LC1399" class="line" lang="haskell"> <span class="n" style="color: #333;">applyWhen</span> <span class="p">(</span><span class="n" style="color: #333;">needToRunPmCheck</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">origin</span><span class="p">)</span></span>
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1400
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<pre style="margin: 0;">+<span id="LC1400" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">locallyExtendPmDeltas</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><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="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;">ev_vars</span><span class="p">)))</span></span>
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<pre style="margin: 0;">+<span id="LC1401" class="line" lang="haskell"> <span class="n" style="color: #333;">m</span></span>
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<pre style="margin: 0;">+<span id="LC1402" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1403" class="line" lang="haskell"><span class="cd">-- | Add equalities for the 'CoreExpr' scrutinee to the local 'DsM' environment</span></span>
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1404
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<pre style="margin: 0;">+<span id="LC1404" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- when checking a case expression:</span></span>
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1405
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<pre style="margin: 0;">+<span id="LC1405" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- case e of x { matches }</span></span>
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1406
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<pre style="margin: 0;">+<span id="LC1406" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- When checking matches we record that (x ~ e) where x is the initial</span></span>
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1407
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<pre style="margin: 0;">+<span id="LC1407" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- uncovered. All matches will have to satisfy this equality.</span></span>
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<pre style="margin: 0;">+<span id="LC1408" class="line" lang="haskell"><span class="n" style="color: #333;">addCoreScrutTmCs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</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;">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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1409
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<pre style="margin: 0;">+<span id="LC1409" class="line" lang="haskell"><span class="n" style="color: #333;">addCoreScrutTmCs</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">k</span></span>
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<pre style="margin: 0;">+<span id="LC1410" class="line" lang="haskell"><span class="n" style="color: #333;">addCoreScrutTmCs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">scr</span><span class="p">)</span> <span class="p">[</span><span class="n" style="color: #333;">x</span><span class="p">]</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">=</span></span>
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1411
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<pre style="margin: 0;">+<span id="LC1411" class="line" lang="haskell"> <span class="n" style="color: #333;">flip</span> <span class="n" style="color: #333;">locallyExtendPmDeltas</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">deltas</span> <span class="o" style="font-weight: 600;">-></span></span>
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1412
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<pre style="margin: 0;">+<span id="LC1412" class="line" lang="haskell"> <span class="n" style="color: #333;">addPmCtsDeltas</span> <span class="n" style="color: #333;">deltas</span> <span class="p">(</span><span class="n" style="color: #333;">unitBag</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmCoreCt</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">scr</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC1413" class="line" lang="haskell"><span class="n" style="color: #333;">addCoreScrutTmCs</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;">"addCoreScrutTmCs: scrutinee, but more than one match id"</span></span>
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<pre style="margin: 0;">+<span id="LC1414" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1415" class="line" lang="haskell"><span class="cd">-- | 'addCoreScrutTmCs', but desugars the 'LHsExpr' first.</span></span>
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<pre style="margin: 0;">+<span id="LC1416" class="line" lang="haskell"><span class="n" style="color: #333;">addHsScrutTmCs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">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="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;">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="LC1417" class="line" lang="haskell"><span class="n" style="color: #333;">addHsScrutTmCs</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">k</span></span>
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<pre style="margin: 0;">+<span id="LC1418" class="line" lang="haskell"><span class="n" style="color: #333;">addHsScrutTmCs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">scr</span><span class="p">)</span> <span class="n" style="color: #333;">vars</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1419
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<pre style="margin: 0;">+<span id="LC1419" class="line" lang="haskell"> <span class="n" style="color: #333;">scr_e</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsLExpr</span> <span class="n" style="color: #333;">scr</span></span>
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<pre style="margin: 0;">+<span id="LC1420" class="line" lang="haskell"> <span class="n" style="color: #333;">addCoreScrutTmCs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">scr_e</span><span class="p">)</span> <span class="n" style="color: #333;">vars</span> <span class="n" style="color: #333;">k</span></span>
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1421
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<pre style="margin: 0;">+<span id="LC1421" class="line" lang="haskell"></span>
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1422
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<pre style="margin: 0;">+<span id="LC1422" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Long-distance information]</span></span>
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1423
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<pre style="margin: 0;">+<span id="LC1423" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1424
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<pre style="margin: 0;">+<span id="LC1424" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider</span></span>
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1425
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<pre style="margin: 0;">+<span id="LC1425" class="line" lang="haskell"></span>
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1426
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<pre style="margin: 0;">+<span id="LC1426" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data Color = R | G | B</span></span>
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1427
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<pre style="margin: 0;">+<span id="LC1427" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: Color -> Int</span></span>
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1428
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<pre style="margin: 0;">+<span id="LC1428" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f R = …</span></span>
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1429
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<pre style="margin: 0;">+<span id="LC1429" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f c = … (case c of</span></span>
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1430
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<pre style="margin: 0;">+<span id="LC1430" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> G -> True</span></span>
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1431
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<pre style="margin: 0;">+<span id="LC1431" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> B -> False) …</span></span>
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1432
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<pre style="margin: 0;">+<span id="LC1432" class="line" lang="haskell"></span>
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1433
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<pre style="margin: 0;">+<span id="LC1433" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Humans can make the "long-distance connection" between the outer pattern match</span></span>
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1434
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<pre style="margin: 0;">+<span id="LC1434" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and the nested case pattern match to see that the inner pattern match is</span></span>
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1435
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<pre style="margin: 0;">+<span id="LC1435" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">exhaustive: @c@ can't be @R@ anymore because it was matched in the first clause</span></span>
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1436
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<pre style="margin: 0;">+<span id="LC1436" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of @f@.</span></span>
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1437
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<pre style="margin: 0;">+<span id="LC1437" class="line" lang="haskell"></span>
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1438
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<pre style="margin: 0;">+<span id="LC1438" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">To achieve similar reasoning in the coverage checker, we keep track of the set</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1439" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1439
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<pre style="margin: 0;">+<span id="LC1439" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of values that can reach a particular program point (often loosely referred to</span></span>
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1440
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<pre style="margin: 0;">+<span id="LC1440" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">as "Covered set") in 'GHC.HsToCore.Monad.dsl_deltas'.</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1441" 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">
1441
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<pre style="margin: 0;">+<span id="LC1441" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We fill that set with Covered Deltas returned by the exported checking</span></span>
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1442
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<pre style="margin: 0;">+<span id="LC1442" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">functions, which the call sites put into place with</span></span>
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1443
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<pre style="margin: 0;">+<span id="LC1443" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'GHC.HsToCore.Monad.updPmDeltas'.</span></span>
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1444
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<pre style="margin: 0;">+<span id="LC1444" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Call sites also extend this set with facts from type-constraint dictionaries,</span></span>
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1445
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<pre style="margin: 0;">+<span id="LC1445" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">case scrutinees, etc. with the exported functions 'addTyCs', 'addCoreScrutTmCs'</span></span>
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1446
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<pre style="margin: 0;">+<span id="LC1446" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and 'addHsScrutTmCs'.</span></span>
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1447
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<pre style="margin: 0;">+<span id="LC1447" class="line" lang="haskell"></span>
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1448
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<pre style="margin: 0;">+<span id="LC1448" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Recovering from unsatisfiable pattern-matching constraints]</span></span>
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1449
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<pre style="margin: 0;">+<span id="LC1449" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1450
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<pre style="margin: 0;">+<span id="LC1450" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider the following code (see #12957 and #15450):</span></span>
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1451
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<pre style="margin: 0;">+<span id="LC1451" class="line" lang="haskell"></span>
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1452
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<pre style="margin: 0;">+<span id="LC1452" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: Int ~ Bool => ()</span></span>
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1453
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<pre style="margin: 0;">+<span id="LC1453" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f = case True of { False -> () }</span></span>
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1454
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<pre style="margin: 0;">+<span id="LC1454" class="line" lang="haskell"></span>
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1455
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<pre style="margin: 0;">+<span id="LC1455" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We want to warn that the pattern-matching in `f` is non-exhaustive. But GHC</span></span>
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1456
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<pre style="margin: 0;">+<span id="LC1456" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">used not to do this; in fact, it would warn that the match was /redundant/!</span></span>
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1457
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<pre style="margin: 0;">+<span id="LC1457" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This is because the constraint (Int ~ Bool) in `f` is unsatisfiable, and the</span></span>
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1458
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<pre style="margin: 0;">+<span id="LC1458" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">coverage checker deems any matches with unsatisfiable constraint sets to be</span></span>
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1459
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<pre style="margin: 0;">+<span id="LC1459" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">unreachable.</span></span>
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1460
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<pre style="margin: 0;">+<span id="LC1460" class="line" lang="haskell"></span>
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1461
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<pre style="margin: 0;">+<span id="LC1461" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We make sure to always start from an inhabited 'Deltas' by calling</span></span>
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1462
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<pre style="margin: 0;">+<span id="LC1462" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'getLdiDeltas', which falls back to the trivially inhabited 'Deltas' if the</span></span>
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1463
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<pre style="margin: 0;">+<span id="LC1463" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">long-distance info returned by 'GHC.HsToCore.Monad.getPmDeltas' is empty.</span></span>
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1464
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<pre style="margin: 0;">+<span id="LC1464" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span></pre>
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<li id="8d8e5922fde8bc19ffa2bc9cae6b6720abb88564">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/4798caa0fefd7adf4c5b85fa84a6f28fcc6b350b...1207576ac0cfdd3fe1ea00b5505f7c874613451e#8d8e5922fde8bc19ffa2bc9cae6b6720abb88564"><strong>compiler/GHC/HsToCore/PmCheck/Oracle.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="167" 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">@@ -167,25 +167,6 @@ mkOneConFull arg_tys con = do</td>
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167
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167
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<pre style="margin: 0;"> <span id="LC167" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Pattern match oracle</span></span>
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168
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168
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<pre style="margin: 0;"> <span id="LC168" class="line" lang="haskell"></span>
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169
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169
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<pre style="margin: 0;"> <span id="LC169" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC170" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Recovering from unsatisfiable pattern-matching constraints]</span></span>
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<pre style="margin: 0;">-<span id="LC171" 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="LC172" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider the following code (see #12957 and #15450):</span></span>
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<pre style="margin: 0;">-<span id="LC173" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC174" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: Int ~ Bool => ()</span></span>
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175
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<pre style="margin: 0;">-<span id="LC175" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f = case True of { False -> () }</span></span>
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176
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<pre style="margin: 0;">-<span id="LC176" class="line" lang="haskell"></span>
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177
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<pre style="margin: 0;">-<span id="LC177" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We want to warn that the pattern-matching in `f` is non-exhaustive. But GHC</span></span>
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178
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<pre style="margin: 0;">-<span id="LC178" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">used not to do this; in fact, it would warn that the match was /redundant/!</span></span>
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179
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<pre style="margin: 0;">-<span id="LC179" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This is because the constraint (Int ~ Bool) in `f` is unsatisfiable, and the</span></span>
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180
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<pre style="margin: 0;">-<span id="LC180" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">coverage checker deems any matches with unsatisfiable constraint sets to be</span></span>
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181
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<pre style="margin: 0;">-<span id="LC181" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">unreachable.</span></span>
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182
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<pre style="margin: 0;">-<span id="LC182" class="line" lang="haskell"></span>
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183
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<pre style="margin: 0;">-<span id="LC183" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We decide to better than this. When beginning coverage checking, we first</span></span>
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184
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<pre style="margin: 0;">-<span id="LC184" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">check if the constraints in scope are unsatisfiable, and if so, we start</span></span>
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185
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<pre style="margin: 0;">-<span id="LC185" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">afresh with an empty set of constraints. This way, we'll get the warnings</span></span>
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186
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<pre style="margin: 0;">-<span id="LC186" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that we expect.</span></span>
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187
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<pre style="margin: 0;">-<span id="LC187" 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="LC188" class="line" lang="haskell"></span>
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189
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170
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<pre style="margin: 0;"> <span id="LC170" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-------------------------------------</span></span>
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190
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171
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<pre style="margin: 0;"> <span id="LC171" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Composable satisfiability checks</span></span>
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191
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172
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<pre style="margin: 0;"> <span id="LC172" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1247" 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">@@ -1266,7 +1247,7 @@ isTyConTriviallyInhabited tc = elementOfUniqSet tc triviallyInhabitedTyCons</td>
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1266
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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;">{- Note [Checking EmptyCase Expressions]</span></span>
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1267
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1248
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<pre style="margin: 0;"> <span id="LC1248" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;"> <span id="LC1249" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Empty case expressions are strict on the scrutinee. That is, `case x of {}`</span></span>
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<pre style="margin: 0;">-<span id="LC1269" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">will force argument `x`. Hence, `checkMatches` is not sufficient for checking</span></span>
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<pre style="margin: 0;">+<span id="LC1250" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">will force argument `x`. Hence, `c<span class="idiff left right">ovC</span>heckMatches` is not sufficient for checking</span></span>
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<pre style="margin: 0;"> <span id="LC1251" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">empty cases, because it assumes that the match is not strict (which is true</span></span>
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<pre style="margin: 0;"> <span id="LC1252" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">for all other cases, apart from EmptyCase). This gave rise to #10746. Instead,</span></span>
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<pre style="margin: 0;"> <span id="LC1253" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we do the following:</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/4798caa0fefd7adf4c5b85fa84a6f28fcc6b350b...1207576ac0cfdd3fe1ea00b5505f7c874613451e#a90b29966ba2a86c0f6927651648cb062f00ea03"><strong>compiler/GHC/HsToCore/PmCheck/Types.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">@@ -592,5 +592,8 @@ instance Outputable Deltas where</td>
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<pre style="margin: 0;"> <span id="LC592" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Semigroup</span> <span class="kt" style="color: #458; font-weight: 600;">Deltas</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC593" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MkDeltas</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;"><></span> <span class="kt" style="color: #458; font-weight: 600;">MkDeltas</span> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkDeltas</span> <span class="p">(</span><span class="n" style="color: #333;">l</span> <span class="p">`</span><span class="n" style="color: #333;">unionBags</span><span class="p">`</span> <span class="n" style="color: #333;">r</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC594" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC595" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Monoid</span> <span class="kt" style="color: #458; font-weight: 600;">Deltas</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC596" class="line" lang="haskell"> <span class="n" style="color: #333;">mempty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkDeltas</span> <span class="n" style="color: #333;">emptyBag</span></span>
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<pre style="margin: 0;">+<span id="LC597" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC598" class="line" lang="haskell"><span class="n" style="color: #333;">liftDeltasM</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Monad</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Delta</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">Delta</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="n" style="color: #333;">m</span> <span class="kt" style="color: #458; font-weight: 600;">Deltas</span></span>
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<pre style="margin: 0;"> <span id="LC599" class="line" lang="haskell"><span class="n" style="color: #333;">liftDeltasM</span> <span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MkDeltas</span> <span class="n" style="color: #333;">ds</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkDeltas</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">catBagMaybes</span> <span class="o" style="font-weight: 600;"><$></span> <span class="p">(</span><span class="n" style="color: #333;">traverse</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">ds</span><span class="p">)</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/4798caa0fefd7adf4c5b85fa84a6f28fcc6b350b...1207576ac0cfdd3fe1ea00b5505f7c874613451e#7dcf5b567a6cd3c9d98cf8d57323fbca1b1536e9"><strong>compiler/GHC/Tc/Types.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">@@ -323,7 +323,7 @@ data DsLclEnv = DsLclEnv {</td>
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<pre style="margin: 0;"> <span id="LC323" class="line" lang="haskell"> <span class="n" style="color: #333;">dsl_meta</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DsMetaEnv</span><span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">-- Template Haskell bindings</span></span>
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<pre style="margin: 0;"> <span id="LC324" class="line" lang="haskell"> <span class="n" style="color: #333;">dsl_loc</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">RealSrcSpan</span><span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">-- To put in pattern-matching error msgs</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="c1" style="color: #998; font-style: italic;">-- See Note [Note [<span class="idiff left right">Type and Term Equality Propag</span>ation] in "GHC.HsToCore.PmCheck"</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;">-- See Note [Note [<span class="idiff left right">Long-distance inform</span>ation] in "GHC.HsToCore.PmCheck"</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;">-- The set of reaching values Deltas is augmented as we walk inwards,</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;">-- refined through each pattern match in turn</span></span>
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<pre style="margin: 0;"> <span id="LC329" class="line" lang="haskell"> <span class="n" style="color: #333;">dsl_deltas</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Deltas</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/4798caa0fefd7adf4c5b85fa84a6f28fcc6b350b...1207576ac0cfdd3fe1ea00b5505f7c874613451e#4d45cd1896284e4b4034580e431af68b09013b33"><strong>compiler/GHC/Utils/Misc.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">@@ -556,9 +556,8 @@ isSingleton :: [a] -> Bool</td>
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<pre style="margin: 0;"> <span id="LC556" class="line" lang="haskell"><span class="n" style="color: #333;">isSingleton</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;">True</span></span>
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<pre style="margin: 0;"> <span id="LC557" class="line" lang="haskell"><span class="n" style="color: #333;">isSingleton</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;"> <span id="LC558" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC559" class="line" lang="haskell"><span class="n" style="color: #333;">notNull</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">-<span id="LC560" class="line" lang="haskell"><span class="n" style="color: #333;">notNull</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;">False</span></span>
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<pre style="margin: 0;">-<span id="LC561" class="line" lang="haskell"><span class="n" style="color: #333;">notNull</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">+<span id="LC559" class="line" lang="haskell"><span class="n" style="color: #333;">notNull</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Foldable</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">=></span> <span class="n" style="color: #333;">f</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;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC560" class="line" lang="haskell"><span class="n" style="color: #333;">notNull</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">not</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">null</span></span>
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<pre style="margin: 0;"> <span id="LC561" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC562" class="line" lang="haskell"><span class="n" style="color: #333;">only</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;">a</span></span>
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<pre style="margin: 0;"> <span id="LC563" 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;">defined</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DEBUG</span><span class="p">)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/4798caa0fefd7adf4c5b85fa84a6f28fcc6b350b...1207576ac0cfdd3fe1ea00b5505f7c874613451e#581c2162bdf32027e268d4f1f76fd7463a805cb0"><strong>testsuite/tests/deSugar/should_compile/ds020.stderr</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">@@ -18,3 +18,11 @@ ds020.hs:20:1: warning: [-Woverlapping-patterns (in -Wdefault)]</td>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="plaintext">ds020.hs:23:1: warning: [-Woverlapping-patterns (in -Wdefault)]</span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="plaintext"> Pattern match is redundant</span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="plaintext"> In an equation for ‘f’: f x@(~[]) = ...</span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="plaintext">ds020.hs:32:1: warning: [-Woverlapping-patterns (in -Wdefault)]</span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="plaintext"> Pattern match is redundant</span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="plaintext"> In a pattern binding: (x1 : xs1 : ys1) = ...</span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="plaintext">ds020.hs:33:1: warning: [-Woverlapping-patterns (in -Wdefault)]</span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="plaintext"> Pattern match is redundant</span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="plaintext"> In a pattern binding: (~x : ~xs : ~ys) = ...</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/4798caa0fefd7adf4c5b85fa84a6f28fcc6b350b...1207576ac0cfdd3fe1ea00b5505f7c874613451e#0c45984ad9bf4e57b152ed07fcb1b36bf1196441"><strong>testsuite/tests/module/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">@@ -83,7 +83,7 @@ test('mod61', normal, compile_fail, [''])</td>
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<pre style="margin: 0;"> <span id="LC83" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">mod62</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC84" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">mod63</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC85" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">mod64</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 class="p">[''])</span></span>
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<pre style="margin: 0;">-<span id="LC86" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">mod65</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 class="p">[''])</span></span>
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<pre style="margin: 0;">+<span id="LC86" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">mod65</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 class="p">['</span><span class="s1" style="color: #d14;"><span class="idiff left right">-Wno-overlapping-patterns</span></span><span class="p">'])</span></span>
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<pre style="margin: 0;"> <span id="LC87" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">mod66</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC88" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">mod67</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC89" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">mod68</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/4798caa0fefd7adf4c5b85fa84a6f28fcc6b350b...1207576ac0cfdd3fe1ea00b5505f7c874613451e#c70fb03205a3f0cb29e4ae40d190f40f06f22caf"><strong>testsuite/tests/pmcheck/should_compile/T18572.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-uni-patterns -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 DataKinds, KindSignatures, GADTs #-}</span></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;">T18572</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC6" 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="kt" style="color: #458; font-weight: 600;">True</span> <span class="c1" style="color: #998; font-style: italic;">-- no warning</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC8" 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="LC9" 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="LC10" 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="LC11" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC12" 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;">SFalse</span> <span class="c1" style="color: #998; font-style: italic;">-- "redundant", not "inaccessible"</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/4798caa0fefd7adf4c5b85fa84a6f28fcc6b350b...1207576ac0cfdd3fe1ea00b5505f7c874613451e#ca32cb2e5ad82cf1602a04517313c35b37ffd83f"><strong>testsuite/tests/pmcheck/should_compile/T18572.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T18572.hs:12:1: warning: [-Winaccessible-code (in -Wdefault)]</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Couldn't match type ‘'False’ with ‘'True’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> Inaccessible code in</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> a pattern with constructor: STrue :: SBool 'True,</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> in a pattern binding</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> • In the pattern: STrue</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext"> In a pattern binding: STrue = SFalse</span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext">T18572.hs:12:1: warning: [-Woverlapping-patterns (in -Wdefault)]</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext"> Pattern match is redundant</span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext"> In a pattern binding: STrue = ...</span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext">T18572.hs:12:1: warning: [-Wincomplete-uni-patterns]</span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext"> Pattern match(es) are non-exhaustive</span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="plaintext"> In a pattern binding: Patterns not matched: SFalse</span></pre>
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<li id="a52966ece03f9e76a93a2c4ea96b9fb25368723d">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/4798caa0fefd7adf4c5b85fa84a6f28fcc6b350b...1207576ac0cfdd3fe1ea00b5505f7c874613451e#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">@@ -102,6 +102,8 @@ test('T17234', normal, compile,</td>
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102
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<pre style="margin: 0;"> <span id="LC102" 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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103
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103
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<pre style="margin: 0;"> <span id="LC103" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17248</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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104
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104
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<pre style="margin: 0;"> <span id="LC104" 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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105
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<pre style="margin: 0;">+<span id="LC105" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17340</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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106
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<pre style="margin: 0;">+<span id="LC106" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">-Wredundant-bang-patterns</span><span class="p">'])</span></span>
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105
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107
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<pre style="margin: 0;"> <span id="LC107" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17357</span><span class="p">',</span> <span class="nv" style="color: #008080;">expect_broken</span><span class="p">(</span><span class="mi" style="color: #099;">17357</span><span class="p">),</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
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106
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108
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<pre style="margin: 0;"> <span id="LC108" 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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107
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109
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<pre style="margin: 0;"> <span id="LC109" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17376</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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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="124" 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">@@ -124,8 +126,8 @@ test('T18478', collect_compiler_stats('bytes allocated',10), compile,</td>
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124
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126
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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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125
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127
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<pre style="margin: 0;"> <span id="LC127" 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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126
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128
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<pre style="margin: 0;"> <span id="LC128" 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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127
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<pre style="margin: 0;">-<span id="LC127" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T1<span class="idiff left right">7340</span></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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128
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<pre style="margin: 0;">-<span id="LC128" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">-<span class="idiff left right">Wredundant-ba</span>ng-patterns</span><span class="p">'])</span></span>
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129
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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;">T1<span class="idiff left right">8572</span></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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130
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<pre style="margin: 0;">+<span id="LC130" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">-<span class="idiff left right">fwarn-incomplete-patterns -fwarn-incomplete-uni-patterns -fwarn-overlappi</span>ng-patterns</span><span class="p">'])</span></span>
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129
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131
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<pre style="margin: 0;"> <span id="LC131" class="line" lang="perl"></span>
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<pre style="margin: 0;"> <span id="LC132" 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="LC133" 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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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/4798caa0fefd7adf4c5b85fa84a6f28fcc6b350b...1207576ac0cfdd3fe1ea00b5505f7c874613451e#5d2894916ade559bc87858aa635d1e7cc11196ee"><strong>testsuite/tests/rename/should_compile/T7085.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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2
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">T7085.hs:8:6: warning: [-Wunused-pattern-binds (in -Wextra, -Wunused-binds)]</span>
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3
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3
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> This pattern-binding binds no variables: Nothing = Just n</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext">T7085.hs:8:6: warning: [-Woverlapping-patterns (in -Wdefault)]</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> Pattern match is redundant</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> In a pattern binding: Nothing = ...</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/4798caa0fefd7adf4c5b85fa84a6f28fcc6b350b...1207576ac0cfdd3fe1ea00b5505f7c874613451e#f829489a82696637aa2035c6dc435892f02a7652"><strong>testsuite/tests/unboxedsums/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">@@ -30,5 +30,5 @@ test('T12711', only_ways(['ghci']), ghci_script, ['T12711.script'])</td>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="perl"><span class="c1" style="color: #998; font-style: italic;"># extra_files([ "unboxedsums" + str(i) + ".hs" for i in range(1, 12) ])],</span></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="perl"><span class="c1" style="color: #998; font-style: italic;"># makefile_test, [])</span></span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="perl"></span>
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<pre style="margin: 0;">-<span id="LC33" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">UbxSumLevPoly</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 class="p">[''])</span></span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">UbxSumLevPoly</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 class="p">['</span><span class="s1" style="color: #d14;"><span class="idiff left right">-Wno-overlapping-patterns</span></span><span class="p">'])</span></span>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T14051</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">multi_compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">T14051.hs</span><span class="p">',</span> <span class="p">[('</span><span class="s1" style="color: #d14;">T14051a.hs</span><span class="p">',</span> <span class="p">'')],</span> <span class="p">'</span><span class="s1" style="color: #d14;">-O2 -v0</span><span class="p">'])</span></span></pre>
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