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<h3>
Sebastian Graf pushed to branch wip/T15753
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/9108ead1d23cecd6c404eabc3d61a47079a099cb">9108ead1</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2019-04-05T10:26:01Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make `singleConstructor` cope with pattern synonyms
Previously, `singleConstructor` didn't handle singleton `COMPLETE` sets
of a single pattern synonym, resulting in incomplete pattern warnings
in #15753.
This is fixed by making `singleConstructor` (now named
`singleMatchConstructor`) query `allCompleteMatches`, necessarily making
it effectful. As a result, most of this patch is concerned with
threading the side-effect through to `singleMatchConstructor`.
Unfortunately, this is not enough to completely fix the original
reproduction from #15753 and #15884, which are related to function
applications in pattern guards being translated too conservatively.
</pre>
</li>
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<h4>5 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#bd37d71fa68b0980d832d992b427fd6a6bdb891d">
compiler/deSugar/Check.hs
</a>
</li>
<li class="file-stats">
<a href="#94cd86ae6cf44be09d9b82ee81d8c6affe948600">
<span class="new-file">
+
testsuite/tests/pmcheck/should_compile/T15753a.hs
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</li>
<li class="file-stats">
<a href="#874074423efd9910d079d93fda653f59e230cf6e">
<span class="new-file">
+
testsuite/tests/pmcheck/should_compile/T15753b.hs
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<li class="file-stats">
<a href="#ee1b1d9c07204fb2f4d8bfa3fa5d55125ba76698">
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+
testsuite/tests/pmcheck/should_compile/T15884.hs
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</a>
</li>
<li class="file-stats">
<a href="#a52966ece03f9e76a93a2c4ea96b9fb25368723d">
testsuite/tests/pmcheck/should_compile/all.T
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<h4>Changes:</h4>
<li id="bd37d71fa68b0980d832d992b427fd6a6bdb891d">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/9108ead1d23cecd6c404eabc3d61a47079a099cb#bd37d71fa68b0980d832d992b427fd6a6bdb891d"><strong>compiler/deSugar/Check.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">@@ -4,9 +4,13 @@ Author: George Karachalias <george.karachalias@cs.kuleuven.be></td>
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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">
<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, GADTs, DataKinds, KindSignatures #-}</span></span>
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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 TupleSections #-}</span></span>
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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="LC7" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE CPP #-}</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE GADTs #-}</span></span>
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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 DataKinds #-}</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 KindSignatures #-}</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 TupleSections #-}</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 ViewPatterns #-}</span></span>
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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 MultiWayIf #-}</span></span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">Check</span> <span class="p">(</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;">-- Checking and printing</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="55" 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="59" 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">@@ -55,7 +59,7 @@ import qualified GHC.LanguageExtensions as LangExt</td>
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<pre style="margin: 0;"> <span id="LC59" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC60" 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;">find</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC61" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Maybe</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">catMaybes</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isJust</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">fromMaybe</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC58" 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;">forM</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="LC62" 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;">forM</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 class="idiff left">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">filterM</span></span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC63" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Coercion</span></span>
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<pre style="margin: 0;"> <span id="LC64" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">TcEvidence</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;">TcSimplify</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">tcNormalise</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">@@ -289,6 +293,14 @@ data PmResult =</td>
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<pre style="margin: 0;"> <span id="LC293" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">pmresultUncovered</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">UncoveredCandidates</span></span>
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<pre style="margin: 0;"> <span id="LC294" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">pmresultInaccessible</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="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="p">}</span></span>
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291
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<pre style="margin: 0;"> <span id="LC295" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC296" 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;">PmResult</span> <span class="kr" style="font-weight: 600;">where</span></span>
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297
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<pre style="margin: 0;">+<span id="LC297" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">pmr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"PmResult"</span><span class="p">)</span> <span class="mi" style="color: #099;">2</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">vcat</span></span>
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298
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<pre style="margin: 0;">+<span id="LC298" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"pmresultProvenance"</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;">pmresultProvenance</span> <span class="n" style="color: #333;">pmr</span><span class="p">)</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;">text</span> <span class="s" style="color: #d14;">"pmresultRedundant"</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;">pmresultRedundant</span> <span class="n" style="color: #333;">pmr</span><span class="p">)</span></span>
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300
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<pre style="margin: 0;">+<span id="LC300" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"pmresultUncovered"</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;">pmresultUncovered</span> <span class="n" style="color: #333;">pmr</span><span class="p">)</span></span>
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301
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<pre style="margin: 0;">+<span id="LC301" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"pmresultInaccessible"</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;">pmresultInaccessible</span> <span class="n" style="color: #333;">pmr</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC302" class="line" lang="haskell"> <span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC303" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC304" class="line" lang="haskell"><span class="cd">-- | Either a list of patterns that are not covered, or their type, in case we</span></span>
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<pre style="margin: 0;"> <span id="LC305" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- have no patterns at hand. Not having patterns at hand can arise when</span></span>
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<pre style="margin: 0;"> <span id="LC306" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- handling EmptyCase expressions, in two cases:</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">@@ -303,6 +315,10 @@ data PmResult =</td>
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<pre style="margin: 0;"> <span id="LC315" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">UncoveredCandidates</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">UncoveredPatterns</span> <span class="kt" style="color: #458; font-weight: 600;">Uncovered</span></span>
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<pre style="margin: 0;"> <span id="LC316" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">TypeOfUncovered</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span></span>
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317
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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="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;">UncoveredCandidates</span> <span class="kr" style="font-weight: 600;">where</span></span>
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319
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<pre style="margin: 0;">+<span id="LC319" 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;">UncoveredPatterns</span> <span class="n" style="color: #333;">uc</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;">"UnPat"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">uc</span></span>
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<pre style="margin: 0;">+<span id="LC320" 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;">TypeOfUncovered</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"UnTy"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC321" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC322" class="line" lang="haskell"><span class="cd">-- | The empty pattern check result</span></span>
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<pre style="margin: 0;"> <span id="LC323" class="line" lang="haskell"><span class="n" style="color: #333;">emptyPmResult</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmResult</span></span>
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<pre style="margin: 0;"> <span id="LC324" class="line" lang="haskell"><span class="n" style="color: #333;">emptyPmResult</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PmResult</span> <span class="kt" style="color: #458; font-weight: 600;">FromBuiltin</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UncoveredPatterns</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1003" 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">@@ -987,7 +1003,7 @@ translatePat fam_insts pat = case pat of</td>
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987
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<pre style="margin: 0;"> <span id="LC1003" 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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1004
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<pre style="margin: 0;"> <span id="LC1004" class="line" lang="haskell"> <span class="n" style="color: #333;">ps</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;">p</span></span>
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989
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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;">xp</span><span class="p">,</span><span class="n" style="color: #333;">xe</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkPmId2Forms</span> <span class="n" style="color: #333;">ty</span></span>
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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;"><span class="idiff left">let</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">g</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">=</span></span> <span class="n" style="color: #333;">mkGuard</span> <span class="n" style="color: #333;">ps</span> <span class="p">(</span><span class="n" style="color: #333;">mkHsWrap</span> <span class="n" style="color: #333;">wrapper</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">xe</span><span class="p">))</span></span>
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1006
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<pre style="margin: 0;">+<span id="LC1006" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">g</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right"><-</span></span> <span class="n" style="color: #333;">mkGuard</span> <span class="n" style="color: #333;">ps</span> <span class="p">(</span><span class="n" style="color: #333;">mkHsWrap</span> <span class="n" style="color: #333;">wrapper</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">xe</span><span class="p">))</span></span>
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991
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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;">return</span> <span class="p">[</span><span class="n" style="color: #333;">xp</span><span class="p">,</span><span class="n" style="color: #333;">g</span><span class="p">]</span></span>
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992
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1008
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<pre style="margin: 0;"> <span id="LC1008" class="line" lang="haskell"></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;">-- (n + k) ===> x (True <- x >= k) (n <- x-k)</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1013" 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">@@ -997,10 +1013,11 @@ translatePat fam_insts pat = case pat of</td>
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997
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1013
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<pre style="margin: 0;"> <span id="LC1013" 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;">lpat</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="LC1014" class="line" lang="haskell"> <span class="n" style="color: #333;">ps</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="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">lpat</span><span class="p">)</span></span>
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1015
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<pre style="margin: 0;"> <span id="LC1015" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Guards and Approximation]</span></span>
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<pre style="margin: 0;">-<span id="LC1000" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">all</span> <span class="n" style="color: #333;">cantFailPattern</span> <span class="n" style="color: #333;">ps</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC1016" 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;">allM</span> <span class="n" style="color: #333;">cantFailPattern</span> <span class="n" style="color: #333;">ps</span></span>
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1017
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<pre style="margin: 0;">+<span id="LC1017" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">res</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1001
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1018
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<pre style="margin: 0;"> <span id="LC1018" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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1002
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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;">xp</span><span class="p">,</span><span class="n" style="color: #333;">xe</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkPmId2Forms</span> <span class="n" style="color: #333;">arg_ty</span></span>
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1003
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<pre style="margin: 0;">-<span id="LC1003" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;"><span class="idiff left">let</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">g</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">=</span></span> <span class="n" style="color: #333;">mkGuard</span> <span class="n" style="color: #333;">ps</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsApp</span> <span class="n" style="color: #333;">noExt</span> <span class="n" style="color: #333;">lexpr</span> <span class="n" style="color: #333;">xe</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1020" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">g</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right"><-</span></span> <span class="n" style="color: #333;">mkGuard</span> <span class="n" style="color: #333;">ps</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsApp</span> <span class="n" style="color: #333;">noExt</span> <span class="n" style="color: #333;">lexpr</span> <span class="n" style="color: #333;">xe</span><span class="p">)</span></span>
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1004
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1021
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<pre style="margin: 0;"> <span id="LC1021" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">[</span><span class="n" style="color: #333;">xp</span><span class="p">,</span><span class="n" style="color: #333;">g</span><span class="p">]</span></span>
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1005
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1022
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<pre style="margin: 0;"> <span id="LC1022" 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;">mkCanFailPmPat</span> <span class="n" style="color: #333;">arg_ty</span></span>
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1006
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1023
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<pre style="margin: 0;"> <span id="LC1023" 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">@@ -1255,41 +1272,38 @@ translateMatch _ _ = panic "translateMatch"</td>
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<pre style="margin: 0;"> <span id="LC1272" class="line" lang="haskell"><span class="n" style="color: #333;">translateGuards</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;">GuardStmt</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;">PatVec</span></span>
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1273
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<pre style="margin: 0;"> <span id="LC1273" class="line" lang="haskell"><span class="n" style="color: #333;">translateGuards</span> <span class="n" style="color: #333;">fam_insts</span> <span class="n" style="color: #333;">guards</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1257
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1274
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<pre style="margin: 0;"> <span id="LC1274" class="line" lang="haskell"> <span class="n" style="color: #333;">all_guards</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;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">translateGuard</span> <span class="n" style="color: #333;">fam_insts</span><span class="p">)</span> <span class="n" style="color: #333;">guards</span></span>
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1258
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<pre style="margin: 0;">-<span id="LC1258" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">replace_unhandled</span> <span class="n" style="color: #333;">all_guards</span><span class="p">)</span></span>
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1259
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<pre style="margin: 0;">-<span id="LC1259" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- It should have been (return all_guards) but it is too expressive.</span></span>
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<pre style="margin: 0;">+<span id="LC1275" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span></span>
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<pre style="margin: 0;">+<span id="LC1276" class="line" lang="haskell"> <span class="n" style="color: #333;">shouldKeep</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Pattern</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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1277
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<pre style="margin: 0;">+<span id="LC1277" class="line" lang="haskell"> <span class="n" style="color: #333;">shouldKeep</span> <span class="n" style="color: #333;">p</span></span>
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1278
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<pre style="margin: 0;">+<span id="LC1278" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">PmVar</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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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="kt" style="color: #458; font-weight: 600;">PmCon</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="o" style="font-weight: 600;">&&</span><span class="p">)</span></span>
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1280
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<pre style="margin: 0;">+<span id="LC1280" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">singleMatchConstructor</span> <span class="p">(</span><span class="n" style="color: #333;">pm_con_con</span> <span class="n" style="color: #333;">p</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">pm_con_arg_tys</span> <span class="n" style="color: #333;">p</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="n" style="color: #333;">allM</span> <span class="n" style="color: #333;">shouldKeep</span> <span class="p">(</span><span class="n" style="color: #333;">pm_con_args</span> <span class="n" style="color: #333;">p</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="n" style="color: #333;">shouldKeep</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmGrd</span> <span class="n" style="color: #333;">pv</span> <span class="n" style="color: #333;">e</span><span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1283" 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">
1283
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<pre style="margin: 0;">+<span id="LC1283" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isNotPmExprOther</span> <span class="n" style="color: #333;">e</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;">True</span> <span class="c1" style="color: #998; font-style: italic;">-- expensive but we want it</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;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">allM</span> <span class="n" style="color: #333;">shouldKeep</span> <span class="n" style="color: #333;">pv</span></span>
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1285
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<pre style="margin: 0;">+<span id="LC1285" class="line" lang="haskell"> <span class="n" style="color: #333;">shouldKeep</span> <span class="n" style="color: #333;">_other_pat</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;">False</span> <span class="c1" style="color: #998; font-style: italic;">-- let the rest..</span></span>
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1286
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<pre style="margin: 0;">+<span id="LC1286" class="line" lang="haskell"></span>
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1287
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<pre style="margin: 0;">+<span id="LC1287" class="line" lang="haskell"> <span class="n" style="color: #333;">all_handled</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">allM</span> <span class="n" style="color: #333;">shouldKeep</span> <span class="n" style="color: #333;">all_guards</span></span>
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1288
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<pre style="margin: 0;">+<span id="LC1288" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- It should have been @pure all_guards@ but it is too expressive.</span></span>
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1260
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1289
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<pre style="margin: 0;"> <span id="LC1289" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Since the term oracle does not handle all constraints we generate,</span></span>
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1261
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1290
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<pre style="margin: 0;"> <span id="LC1290" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we (hackily) replace all constraints the oracle cannot handle with a</span></span>
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1262
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<pre style="margin: 0;">-<span id="LC1262" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- single one (we need to know if there is a possibility of falure).</span></span>
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1291
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<pre style="margin: 0;">+<span id="LC1291" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- single one (we need to know if there is a possibility of fa<span class="idiff left right">i</span>lure).</span></span>
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1263
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1292
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<pre style="margin: 0;"> <span id="LC1292" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Guards and Approximation] for all guard-related approximations</span></span>
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1264
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1293
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<pre style="margin: 0;"> <span id="LC1293" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we implement.</span></span>
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1265
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<pre style="margin: 0;">-<span id="LC1265" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1266
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<pre style="margin: 0;">-<span id="LC1266" class="line" lang="haskell"> <span class="n" style="color: #333;">replace_unhandled</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PatVec</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PatVec</span></span>
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1267
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<pre style="margin: 0;">-<span id="LC1267" class="line" lang="haskell"> <span class="n" style="color: #333;">replace_unhandled</span> <span class="n" style="color: #333;">gv</span></span>
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1268
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<pre style="margin: 0;">-<span id="LC1268" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">any_unhandled</span> <span class="n" style="color: #333;">gv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fake_pat</span> <span class="o" style="font-weight: 600;">:</span> <span class="p">[</span> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">gv</span><span class="p">,</span> <span class="n" style="color: #333;">shouldKeep</span> <span class="n" style="color: #333;">p</span> <span class="p">]</span></span>
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1269
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<pre style="margin: 0;">-<span id="LC1269" 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;">gv</span></span>
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1270
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<pre style="margin: 0;">-<span id="LC1270" class="line" lang="haskell"></span>
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1271
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<pre style="margin: 0;">-<span id="LC1271" class="line" lang="haskell"> <span class="n" style="color: #333;">any_unhandled</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PatVec</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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<td class="diff-line-num old old_line" data-linenumber="1272" 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">
1272
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<pre style="margin: 0;">-<span id="LC1272" class="line" lang="haskell"> <span class="n" style="color: #333;">any_unhandled</span> <span class="n" style="color: #333;">gv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">any</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">shouldKeep</span><span class="p">)</span> <span class="n" style="color: #333;">gv</span></span>
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1273
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<pre style="margin: 0;">-<span id="LC1273" class="line" lang="haskell"></span>
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<td class="diff-line-num old old_line" data-linenumber="1274" 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">
1274
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<pre style="margin: 0;">-<span id="LC1274" class="line" lang="haskell"> <span class="n" style="color: #333;">shouldKeep</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Pattern</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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1275
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<pre style="margin: 0;">-<span id="LC1275" class="line" lang="haskell"> <span class="n" style="color: #333;">shouldKeep</span> <span class="n" style="color: #333;">p</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1276" 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">
1276
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<td class="diff-line-num new_line old" data-linenumber="1294" 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="LC1276" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">PmVar</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1277" 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">
1277
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<pre style="margin: 0;">-<span id="LC1277" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">PmCon</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">singleConstructor</span> <span class="p">(</span><span class="n" style="color: #333;">pm_con_con</span> <span class="n" style="color: #333;">p</span><span class="p">)</span></span>
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1278
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<pre style="margin: 0;">-<span id="LC1278" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">all</span> <span class="n" style="color: #333;">shouldKeep</span> <span class="p">(</span><span class="n" style="color: #333;">pm_con_args</span> <span class="n" style="color: #333;">p</span><span class="p">)</span></span>
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1279
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<pre style="margin: 0;">-<span id="LC1279" class="line" lang="haskell"> <span class="n" style="color: #333;">shouldKeep</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmGrd</span> <span class="n" style="color: #333;">pv</span> <span class="n" style="color: #333;">e</span><span class="p">)</span></span>
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1280
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<pre style="margin: 0;">-<span id="LC1280" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">all</span> <span class="n" style="color: #333;">shouldKeep</span> <span class="n" style="color: #333;">pv</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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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="n" style="color: #333;">isNotPmExprOther</span> <span class="n" style="color: #333;">e</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;">-- expensive but we want it</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="n" style="color: #333;">shouldKeep</span> <span class="n" style="color: #333;">_other_pat</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="c1" style="color: #998; font-style: italic;">-- let the rest..</span></span>
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1294
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<pre style="margin: 0;">+<span id="LC1294" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">all_handled</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1295" 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">
1295
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<pre style="margin: 0;">+<span id="LC1295" 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;">all_guards</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1296" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1296
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<pre style="margin: 0;">+<span id="LC1296" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1297" 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">
1297
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<pre style="margin: 0;">+<span id="LC1297" class="line" lang="haskell"> <span class="n" style="color: #333;">kept</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">filterM</span> <span class="n" style="color: #333;">shouldKeep</span> <span class="n" style="color: #333;">all_guards</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1298" 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">
1298
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<pre style="margin: 0;">+<span id="LC1298" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">fake_pat</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">kept</span><span class="p">)</span></span>
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1283
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<td class="diff-line-num new_line" data-linenumber="1299" 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">
1299
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<pre style="margin: 0;"> <span id="LC1299" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1300" class="line" lang="haskell"><span class="cd">-- | Check whether a pattern can fail to match</span></span>
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<pre style="margin: 0;">-<span id="LC1285" class="line" lang="haskell"><span class="n" style="color: #333;">cantFailPattern</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Pattern</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="LC1286" class="line" lang="haskell"><span class="n" style="color: #333;">cantFailPattern</span> <span class="n" style="color: #333;">p</span></span>
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<pre style="margin: 0;">-<span id="LC1287" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">PmVar</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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1288
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<pre style="margin: 0;">-<span id="LC1288" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">PmCon</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">singleConstructor</span> <span class="p">(</span><span class="n" style="color: #333;">pm_con_con</span> <span class="n" style="color: #333;">p</span><span class="p">)</span></span>
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1289
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<pre style="margin: 0;">-<span id="LC1289" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">all</span> <span class="n" style="color: #333;">cantFailPattern</span> <span class="p">(</span><span class="n" style="color: #333;">pm_con_args</span> <span class="n" style="color: #333;">p</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1290" class="line" lang="haskell"><span class="n" style="color: #333;">cantFailPattern</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmGrd</span> <span class="n" style="color: #333;">pv</span> <span class="n" style="color: #333;">_e</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1291" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">all</span> <span class="n" style="color: #333;">cantFailPattern</span> <span class="n" style="color: #333;">pv</span></span>
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<pre style="margin: 0;">-<span id="LC1292" class="line" lang="haskell"><span class="n" style="color: #333;">cantFailPattern</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="LC1301" class="line" lang="haskell"><span class="n" style="color: #333;">cantFailPattern</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Pattern</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="LC1302" class="line" lang="haskell"><span class="n" style="color: #333;">cantFailPattern</span> <span class="kt" style="color: #458; font-weight: 600;">PmVar</span> <span class="p">{}</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;">True</span></span>
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<pre style="margin: 0;">+<span id="LC1303" class="line" lang="haskell"><span class="n" style="color: #333;">cantFailPattern</span> <span class="kt" style="color: #458; font-weight: 600;">PmCon</span> <span class="p">{</span> <span class="n" style="color: #333;">pm_con_con</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">c</span><span class="p">,</span> <span class="n" style="color: #333;">pm_con_arg_tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tys</span><span class="p">,</span> <span class="n" style="color: #333;">pm_con_args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ps</span><span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1304" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="o" style="font-weight: 600;">&&</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">singleMatchConstructor</span> <span class="n" style="color: #333;">c</span> <span class="n" style="color: #333;">tys</span> <span class="o" style="font-weight: 600;"><*></span> <span class="n" style="color: #333;">allM</span> <span class="n" style="color: #333;">cantFailPattern</span> <span class="n" style="color: #333;">ps</span></span>
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<pre style="margin: 0;">+<span id="LC1305" class="line" lang="haskell"><span class="n" style="color: #333;">cantFailPattern</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmGrd</span> <span class="n" style="color: #333;">pv</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;">allM</span> <span class="n" style="color: #333;">cantFailPattern</span> <span class="n" style="color: #333;">pv</span></span>
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<pre style="margin: 0;">+<span id="LC1306" class="line" lang="haskell"><span class="n" style="color: #333;">cantFailPattern</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;">False</span></span>
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1307
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<pre style="margin: 0;"> <span id="LC1307" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1308" class="line" lang="haskell"><span class="cd">-- | Translate a guard statement to Pattern</span></span>
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<pre style="margin: 0;"> <span id="LC1309" 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;">PatVec</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">@@ -1312,7 +1326,8 @@ translateLet _binds = return []</td>
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<pre style="margin: 0;"> <span id="LC1326" class="line" lang="haskell"><span class="n" style="color: #333;">translateBind</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;">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;">PatVec</span></span>
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1313
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1327
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<pre style="margin: 0;"> <span id="LC1327" class="line" lang="haskell"><span class="n" style="color: #333;">translateBind</span> <span class="n" style="color: #333;">fam_insts</span> <span class="p">(</span><span class="n" style="color: #333;">dL</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;">p</span><span class="p">)</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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1314
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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;">ps</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;">p</span></span>
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1315
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<td class="diff-line-num new_line old" data-linenumber="1329" 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="LC1315" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">[</span><span class="n" style="color: #333;">mkGuard</span> <span class="n" style="color: #333;">ps</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">e</span><span class="p">)]</span></span>
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1329
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<pre style="margin: 0;">+<span id="LC1329" class="line" lang="haskell"> <span class="n" style="color: #333;">g</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkGuard</span> <span class="n" style="color: #333;">ps</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">e</span><span class="p">)</span></span>
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1330
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<pre style="margin: 0;">+<span id="LC1330" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">[</span><span class="n" style="color: #333;">g</span><span class="p">]</span></span>
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1316
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1331
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<pre style="margin: 0;"> <span id="LC1331" class="line" lang="haskell"></span>
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1317
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1332
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<pre style="margin: 0;"> <span id="LC1332" class="line" lang="haskell"><span class="cd">-- | Translate a boolean guard</span></span>
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1318
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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;">translateBoolGuard</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;">PatVec</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1321" 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="1336" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1321,7 +1336,7 @@ translateBoolGuard e</td>
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1321
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1336
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<pre style="margin: 0;"> <span id="LC1336" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The formal thing to do would be to generate (True <- True)</span></span>
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1322
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1337
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<pre style="margin: 0;"> <span id="LC1337" 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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1323
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1338
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<pre style="margin: 0;"> <span id="LC1338" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- PatVec for efficiency</span></span>
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1324
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<pre style="margin: 0;">-<span id="LC1324" 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;"><span class="idiff left">return</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="n" style="color: #333;"><span class="idiff">mkGuard</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="n" style="color: #333;"><span class="idiff">truePattern</span></span><span class="p"><span class="idiff">]</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">unLoc</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">e</span></span><span class="p"><span class="idiff right">)]</span></span></span>
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1339
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<pre style="margin: 0;">+<span id="LC1339" 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 class="idiff left">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">:</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">[]</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><$></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">mkGuard</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="n" style="color: #333;"><span class="idiff">truePattern</span></span><span class="p"><span class="idiff">]</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">unLoc</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">e</span></span><span class="p"><span class="idiff right">)</span></span></span>
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1325
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1340
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<pre style="margin: 0;"> <span id="LC1340" class="line" lang="haskell"></span>
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1326
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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;">{- Note [Guards and Approximation]</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;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</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">@@ -1658,13 +1673,14 @@ mkOneConFull x con = do</td>
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1658
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1673
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<pre style="margin: 0;"> <span id="LC1673" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * More smart constructors and fresh variable generation</span></span>
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1659
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1674
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<pre style="margin: 0;"> <span id="LC1674" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1675" class="line" lang="haskell"><span class="cd">-- | Create a guard pattern</span></span>
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<pre style="margin: 0;">-<span id="LC1661" class="line" lang="haskell"><span class="n" style="color: #333;">mkGuard</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PatVec</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsExpr</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;">Pattern</span></span>
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<pre style="margin: 0;">-<span id="LC1662" class="line" lang="haskell"><span class="n" style="color: #333;">mkGuard</span> <span class="n" style="color: #333;">pv</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;">-<span id="LC1663" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">all</span> <span class="n" style="color: #333;">cantFailPattern</span> <span class="n" style="color: #333;">pv</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PmGrd</span> <span class="n" style="color: #333;">pv</span> <span class="n" style="color: #333;">expr</span></span>
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1664
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<pre style="margin: 0;">-<span id="LC1664" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprOther</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fake_pat</span></span>
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1665
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<pre style="margin: 0;">-<span id="LC1665" 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;">PmGrd</span> <span class="n" style="color: #333;">pv</span> <span class="n" style="color: #333;">expr</span></span>
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1666
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<pre style="margin: 0;">-<span id="LC1666" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC1667" class="line" lang="haskell"> <span class="n" style="color: #333;">expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hsExprToPmExpr</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;">+<span id="LC1676" class="line" lang="haskell"><span class="n" style="color: #333;">mkGuard</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PatVec</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsExpr</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;">Pattern</span></span>
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<pre style="margin: 0;">+<span id="LC1677" class="line" lang="haskell"><span class="n" style="color: #333;">mkGuard</span> <span class="n" style="color: #333;">pv</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="LC1678" 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;">allM</span> <span class="n" style="color: #333;">cantFailPattern</span> <span class="n" style="color: #333;">pv</span></span>
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<pre style="margin: 0;">+<span id="LC1679" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hsExprToPmExpr</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;">+<span id="LC1680" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePmD</span> <span class="s" style="color: #d14;">"mkGuard"</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;">pv</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">e</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="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">expr</span><span class="p">])</span></span>
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<pre style="margin: 0;">+<span id="LC1681" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">if</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">res</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;">PmGrd</span> <span class="n" style="color: #333;">pv</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1682" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprOther</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">expr</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">fake_pat</span></span>
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<pre style="margin: 0;">+<span id="LC1683" 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;">pure</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmGrd</span> <span class="n" style="color: #333;">pv</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1684" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1685" class="line" lang="haskell"><span class="cd">-- | Create a term equality of the form: `(False ~ (x ~ lit))`</span></span>
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<pre style="margin: 0;"> <span id="LC1686" class="line" lang="haskell"><span class="n" style="color: #333;">mkNegEq</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;">ComplexEq</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">@@ -1738,14 +1754,37 @@ coercePmPat (PmCon { pm_con_con = con, pm_con_arg_tys = arg_tys</td>
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<pre style="margin: 0;"> <span id="LC1754" 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="n" style="color: #333;">coercePatVec</span> <span class="n" style="color: #333;">args</span> <span class="p">}]</span></span>
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<pre style="margin: 0;"> <span id="LC1755" class="line" lang="haskell"><span class="n" style="color: #333;">coercePmPat</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;">[]</span> <span class="c1" style="color: #998; font-style: italic;">-- drop the guards</span></span>
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<pre style="margin: 0;"> <span id="LC1756" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1741" class="line" lang="haskell"><span class="cd">-- | Check whether a data constructor is the only way to construct</span></span>
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<pre style="margin: 0;">-<span id="LC1742" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- a data type.</span></span>
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<pre style="margin: 0;">-<span id="LC1743" class="line" lang="haskell"><span class="n" style="color: #333;">singleConstructor</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="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">-<span id="LC1744" class="line" lang="haskell"><span class="n" style="color: #333;">singleConstructor</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>
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<pre style="margin: 0;">-<span id="LC1745" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">tyConDataCons</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="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC1746" class="line" lang="haskell"> <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="LC1747" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">-<span id="LC1748" class="line" lang="haskell"><span class="n" style="color: #333;">singleConstructor</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="LC1757" class="line" lang="haskell"><span class="cd">-- | Check whether a 'ConLike' has the /single match/ property, i.e. whether</span></span>
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<pre style="margin: 0;">+<span id="LC1758" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- it is the only possible match in the given context. See also</span></span>
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<pre style="margin: 0;">+<span id="LC1759" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'allCompleteMatches' and Note [Single match constructors].</span></span>
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<pre style="margin: 0;">+<span id="LC1760" class="line" lang="haskell"><span class="n" style="color: #333;">singleMatchConstructor</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="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="LC1761" class="line" lang="haskell"><span class="n" style="color: #333;">singleMatchConstructor</span> <span class="n" style="color: #333;">cl</span> <span class="n" style="color: #333;">tys</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC1762" class="line" lang="haskell"> <span class="n" style="color: #333;">any</span> <span class="p">(</span><span class="n" style="color: #333;">isSingleton</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">snd</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">allCompleteMatches</span> <span class="n" style="color: #333;">cl</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;">+<span id="LC1763" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1764" 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="LC1765" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Single match constructors]</span></span>
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<pre style="margin: 0;">+<span id="LC1766" 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="LC1767" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">When translating pattern guards for consumption by the checker, we desugar</span></span>
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1768
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<pre style="margin: 0;">+<span id="LC1768" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">every pattern guard that might fail ('cantFailPattern') to 'fake_pat'</span></span>
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1769
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<pre style="margin: 0;">+<span id="LC1769" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(True <- _). Which patterns can't fail? Exactly those that only match on</span></span>
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1770
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<pre style="margin: 0;">+<span id="LC1770" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'singleMatchConstructor's.</span></span>
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1771
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<pre style="margin: 0;">+<span id="LC1771" class="line" lang="haskell"></span>
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1772
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<pre style="margin: 0;">+<span id="LC1772" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here are a few examples:</span></span>
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1773
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<pre style="margin: 0;">+<span id="LC1773" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * @f a | (a, b) <- foo a = 42@: Product constructors are generally</span></span>
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1774
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<pre style="margin: 0;">+<span id="LC1774" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> single match. This extends to single constructors of GADTs like 'Refl'.</span></span>
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1775
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<pre style="margin: 0;">+<span id="LC1775" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * If @f | Id <- id () = 42@, where @pattern Id = ()@ and 'Id' is part of a</span></span>
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1776
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<pre style="margin: 0;">+<span id="LC1776" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> singleton `COMPLETE` set, then 'Id' has the single match property.</span></span>
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1777
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<pre style="margin: 0;">+<span id="LC1777" class="line" lang="haskell"></span>
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1778
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<pre style="margin: 0;">+<span id="LC1778" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In effect, we can just enumerate 'allCompleteMatches' and check if the conlike</span></span>
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1779
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<pre style="margin: 0;">+<span id="LC1779" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">occurs as a singleton set.</span></span>
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1780
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<pre style="margin: 0;">+<span id="LC1780" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">There's the chance that 'Id' is part of multiple `COMPLETE` sets. That's</span></span>
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1781
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<pre style="margin: 0;">+<span id="LC1781" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">irrelevant; If the user specified a singleton set, it is single-match.</span></span>
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1782
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<pre style="margin: 0;">+<span id="LC1782" class="line" lang="haskell"></span>
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1783
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<pre style="margin: 0;">+<span id="LC1783" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that this doesn't really take into account incoming type constraints;</span></span>
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1784
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<pre style="margin: 0;">+<span id="LC1784" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">It might be obvious from type context that a particular GADT constructor has</span></span>
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1785
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<pre style="margin: 0;">+<span id="LC1785" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the single-match property. We currently don't (can't) check this in the</span></span>
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1786
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<pre style="margin: 0;">+<span id="LC1786" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">translation step. See #15753 for why this yields surprising results.</span></span>
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1787
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<pre style="margin: 0;">+<span id="LC1787" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1749
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1788
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<pre style="margin: 0;"> <span id="LC1788" class="line" lang="haskell"></span>
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1750
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1789
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<pre style="margin: 0;"> <span id="LC1789" class="line" lang="haskell"><span class="cd">-- | For a given conlike, finds all the sets of patterns which could</span></span>
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1751
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1790
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<pre style="margin: 0;"> <span id="LC1790" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- be relevant to that conlike by consulting the result type.</span></span>
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<li id="94cd86ae6cf44be09d9b82ee81d8c6affe948600">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/9108ead1d23cecd6c404eabc3d61a47079a099cb#94cd86ae6cf44be09d9b82ee81d8c6affe948600"><strong>testsuite/tests/pmcheck/should_compile/T15753a.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE GADTs #-}</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 TypeOperators #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# OPTIONS_GHC -Wincomplete-patterns #-}</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;">Bug</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Type.Equality</span></span>
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7
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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;">G</span> <span class="n" style="color: #333;">a</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;">GInt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">G</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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10
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">GBool</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">G</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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11
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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="n" style="color: #333;">ex1</span><span class="p">,</span> <span class="n" style="color: #333;">ex2</span><span class="p">,</span> <span class="n" style="color: #333;">ex3</span></span>
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13
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"> <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;">Int</span></span>
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14
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">G</span> <span class="n" style="color: #333;">a</span></span>
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15
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span></span>
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16
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"></span>
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17
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"><span class="n" style="color: #333;">ex1</span> <span class="kt" style="color: #458; font-weight: 600;">Refl</span> <span class="n" style="color: #333;">g</span></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">GInt</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">id</span> <span class="n" style="color: #333;">g</span></span>
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19
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span></span>
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20
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"><span class="n" style="color: #333;">ex2</span> <span class="kt" style="color: #458; font-weight: 600;">Refl</span> <span class="n" style="color: #333;">g</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">GInt</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">g</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"><span class="n" style="color: #333;">ex3</span> <span class="kt" style="color: #458; font-weight: 600;">Refl</span> <span class="n" style="color: #333;">g</span></span>
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<pre style="margin: 0;">+<span id="LC26" 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;">id</span> <span class="n" style="color: #333;">g</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">GInt</span> <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/9108ead1d23cecd6c404eabc3d61a47079a099cb#874074423efd9910d079d93fda653f59e230cf6e"><strong>testsuite/tests/pmcheck/should_compile/T15753b.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE PatternSynonyms #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">Bug</span> <span class="kr" style="font-weight: 600;">where</span></span>
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3
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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="cp" style="color: #999; font-weight: 600;">{-# COMPLETE Id #-}</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="n" style="color: #333;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">::</span> <span class="nb" style="color: #0086b3;">()</span></span>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="n" style="color: #333;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="n" style="color: #333;">bug</span> <span class="o" style="font-weight: 600;">::</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="n" style="color: #333;">bug</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="n" style="color: #333;">id</span> <span class="nb" style="color: #0086b3;">()</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/9108ead1d23cecd6c404eabc3d61a47079a099cb#ee1b1d9c07204fb2f4d8bfa3fa5d55125ba76698"><strong>testsuite/tests/pmcheck/should_compile/T15884.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE ViewPatterns #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">Bug</span> <span class="kr" style="font-weight: 600;">where</span></span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</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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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="p">(</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;">Nothing</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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7
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="n" style="color: #333;">id</span><span class="o" style="font-weight: 600;">-></span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</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></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/9108ead1d23cecd6c404eabc3d61a47079a099cb#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">@@ -68,6 +68,12 @@ test('T15584', normal, compile,</td>
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68
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<pre style="margin: 0;"> <span id="LC68" class="line" lang="perl"> <span class="p">[</span><span class="s" style="color: #d14;">'-fwarn-incomplete-patterns -fwarn-overlapping-patterns'</span><span class="p">])</span></span>
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69
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<pre style="margin: 0;"> <span id="LC69" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'T15713'</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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70
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70
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<pre style="margin: 0;"> <span id="LC70" class="line" lang="perl"> <span class="p">[</span><span class="s" style="color: #d14;">'-fwarn-incomplete-patterns -fwarn-overlapping-patterns'</span><span class="p">])</span></span>
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71
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<pre style="margin: 0;">+<span id="LC71" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'T15753a'</span><span class="p">,</span> <span class="nv" style="color: #008080;">expect_broken</span><span class="p">(</span><span class="mi" style="color: #099;">15753</span><span class="p">),</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
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72
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<pre style="margin: 0;">+<span id="LC72" class="line" lang="perl"> <span class="p">[</span><span class="s" style="color: #d14;">'-fwarn-incomplete-patterns -fwarn-overlapping-patterns'</span><span class="p">])</span></span>
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73
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<pre style="margin: 0;">+<span id="LC73" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'T15753b'</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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74
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<pre style="margin: 0;">+<span id="LC74" class="line" lang="perl"> <span class="p">[</span><span class="s" style="color: #d14;">'-fwarn-incomplete-patterns -fwarn-overlapping-patterns'</span><span class="p">])</span></span>
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<pre style="margin: 0;">+<span id="LC75" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'T15884'</span><span class="p">,</span> <span class="nv" style="color: #008080;">expect_broken</span><span class="p">(</span><span class="mi" style="color: #099;">15884</span><span class="p">),</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
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76
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<pre style="margin: 0;">+<span id="LC76" class="line" lang="perl"> <span class="p">[</span><span class="s" style="color: #d14;">'-fwarn-incomplete-patterns -fwarn-overlapping-patterns'</span><span class="p">])</span></span>
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71
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<pre style="margin: 0;"> <span id="LC77" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'T16289'</span><span class="p">,</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC78" class="line" lang="perl"> <span class="p">[</span><span class="s" style="color: #d14;">'-fwarn-incomplete-patterns -fwarn-overlapping-patterns'</span><span class="p">])</span></span>
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73
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<pre style="margin: 0;"> <span id="LC79" class="line" lang="perl"></span>
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