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<h3>
Sebastian Graf pushed to branch wip/pmcheck-refuts
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/08c42ce3b5f425654e8ae49ca1c54c1471017d43">08c42ce3</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2019-05-24T12:35:22Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">TmOracle: Replace negative term equalities by refutable PmAltCons
The `PmExprEq` business was a huge hack and was at the same time vastly
too powerful and not powerful enough to encode negative term equalities,
i.e. facts of the form "forall y. x ≁ Just y".
This patch introduces the concept of 'refutable shapes': What matters
for the pattern match checker is being able to encode knowledge of the
form "x can no longer be the literal 5" or "x can no longer be Just y,
for any y". We encode this knowledge in the form of a `PmRefutEnv`,
storing a set of newly introduced `PmAltCon`s (literals and `ConLike`s)
for each variable denoting equations of the above form.
So, say we have `x ≁ Just ∈ refuts` in the term oracle context and
try to solve an equality like `x ~ Just 5`. The entry in the refutable
environment will immediately lead to a contradiction.
This machinery makes the whole `PmExprEq` business completely
unnecessary, getting rid of a lot of (mostly dead) code.
Note that the PmAltConLike case is currently unnecessary. This is bound
to change in a follow-up patch. If we began to use PmAltConLike, we'd
even profit from nicer error messages as is currently the case for
negative literal equalities.
See the Note [Refutable shapes] in TmOracle for a place to start.
</pre>
</li>
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<h4>7 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#49d2d51d42e9c209de33c35681b9c9b1e912cda9">
compiler/basicTypes/NameEnv.hs
</a>
</li>
<li class="file-stats">
<a href="#bd37d71fa68b0980d832d992b427fd6a6bdb891d">
compiler/deSugar/Check.hs
</a>
</li>
<li class="file-stats">
<a href="#7589abbc710cc40f6e48245c2bc16d69f556b714">
compiler/deSugar/PmExpr.hs
</a>
</li>
<li class="file-stats">
<a href="#584407121afc66978c814dbdb5c252118d27656a">
<span class="new-file">
+
compiler/deSugar/PmPpr.hs
</span>
</a>
</li>
<li class="file-stats">
<a href="#379674a5063221cec43f0f659c2eb67b30339f45">
compiler/deSugar/TmOracle.hs
</a>
</li>
<li class="file-stats">
<a href="#0f33fd88c617246c7f89c4477d2d1d24f942df23">
compiler/ghc.cabal.in
</a>
</li>
<li class="file-stats">
<a href="#2cbc08c5f3b1dcbc9c763a836b51491224c05e50">
compiler/utils/ListSetOps.hs
</a>
</li>
</ul>
<h4>Changes:</h4>
<li id="49d2d51d42e9c209de33c35681b9c9b1e912cda9">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/08c42ce3b5f425654e8ae49ca1c54c1471017d43#49d2d51d42e9c209de33c35681b9c9b1e912cda9"><strong>compiler/basicTypes/NameEnv.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="25" 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">@@ -25,6 +25,7 @@ module NameEnv (</td>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"></span>
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<td class="diff-line-num old_line" data-linenumber="26" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">emptyDNameEnv</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">lookupDNameEnv</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">delFromDNameEnv</span><span class="p">,</span></span>
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<td class="diff-line-num old_line" data-linenumber="28" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="diff-line-num new_line" data-linenumber="29" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mapDNameEnv</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">alterDNameEnv</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ** Dependency analysis</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="147" 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="148" 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">@@ -147,8 +148,11 @@ emptyDNameEnv = emptyUDFM</td>
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<pre style="margin: 0;"> <span id="LC148" class="line" lang="haskell"><span class="n" style="color: #333;">lookupDNameEnv</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DNameEnv</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;">Name</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>
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<td class="diff-line-num old_line" data-linenumber="148" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC149" class="line" lang="haskell"><span class="n" style="color: #333;">lookupDNameEnv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lookupUDFM</span></span>
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<pre style="margin: 0;"> <span id="LC150" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC151" class="line" lang="haskell"><span class="n" style="color: #333;">delFromDNameEnv</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DNameEnv</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;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DNameEnv</span> <span class="n" style="color: #333;">a</span></span>
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<td class="diff-line-num new new_line" data-linenumber="152" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC152" class="line" lang="haskell"><span class="n" style="color: #333;">delFromDNameEnv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">delFromUDFM</span></span>
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<td class="diff-line-num new new_line" data-linenumber="153" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC153" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC154" class="line" lang="haskell"><span class="n" style="color: #333;">mapDNameEnv</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DNameEnv</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;">DNameEnv</span> <span class="n" style="color: #333;">b</span></span>
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<pre style="margin: 0;"> <span id="LC155" class="line" lang="haskell"><span class="n" style="color: #333;">mapDNameEnv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapUDFM</span></span>
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<pre style="margin: 0;"> <span id="LC156" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC157" class="line" lang="haskell"><span class="n" style="color: #333;">alterDNameEnv</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">a</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="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DNameEnv</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;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DNameEnv</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">-<span id="LC154" class="line" lang="haskell"><span class="n" style="color: #333;">alterDNameEnv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">alterUDFM</span></span></pre>
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<pre style="margin: 0;">+<span id="LC158" class="line" lang="haskell"><span class="n" style="color: #333;">alterDNameEnv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">alterUDFM</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/08c42ce3b5f425654e8ae49ca1c54c1471017d43#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">@@ -25,6 +25,7 @@ module Check (</td>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GhcPrelude</span></span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">TmOracle</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">PmPpr</span></span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Unify</span><span class="p">(</span> <span class="n" style="color: #333;">tcMatchTy</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">DynFlags</span></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">HsSyn</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">@@ -1672,11 +1673,6 @@ mkGuard pv e = do</td>
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<pre style="margin: 0;"> <span id="LC1673" 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="kt" style="color: #458; font-weight: 600;">PmFake</span></span>
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<pre style="margin: 0;"> <span id="LC1674" 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="LC1675" 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 term equality of the form: `(False ~ (x ~ lit))`</span></span>
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1676
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<pre style="margin: 0;">-<span id="LC1676" 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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1677
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<pre style="margin: 0;">-<span id="LC1677" class="line" lang="haskell"><span class="n" style="color: #333;">mkNegEq</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">falsePmExpr</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="p">(</span><span class="n" style="color: #333;">idName</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="p">`</span><span class="kt" style="color: #458; font-weight: 600;">PmExprEq</span><span class="p">`</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprLit</span> <span class="n" style="color: #333;">l</span><span class="p">)</span></span>
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1678
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<pre style="margin: 0;">-<span id="LC1678" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINE mkNegEq #-}</span></span>
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<pre style="margin: 0;">-<span id="LC1679" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1676" class="line" lang="haskell"><span class="cd">-- | Create a term equality of the form: `(x ~ lit)`</span></span>
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1681
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1677
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<pre style="margin: 0;"> <span id="LC1677" class="line" lang="haskell"><span class="n" style="color: #333;">mkPosEq</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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1682
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1678
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<pre style="margin: 0;"> <span id="LC1678" class="line" lang="haskell"><span class="n" style="color: #333;">mkPosEq</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="p">(</span><span class="n" style="color: #333;">idName</span> <span class="n" style="color: #333;">x</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprLit</span> <span class="n" style="color: #333;">l</span><span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2112" 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">@@ -2116,7 +2112,8 @@ pmcheckHd (p@(PmLit l)) ps guards (PmVar x) (ValVec vva delta)</td>
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2116
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2112
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<pre style="margin: 0;"> <span id="LC2112" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ValVec</span> <span class="n" style="color: #333;">vva</span> <span class="p">(</span><span class="n" style="color: #333;">delta</span> <span class="p">{</span><span class="n" style="color: #333;">delta_tm_cs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tm_state</span><span class="p">})</span></span>
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2117
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2113
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<pre style="margin: 0;"> <span id="LC2113" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">mempty</span></span>
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2118
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2114
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<pre style="margin: 0;"> <span id="LC2114" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2119
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<td class="diff-line-num new_line old" data-linenumber="2115" 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="LC2119" class="line" lang="haskell"> <span class="n" style="color: #333;">us</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">tm_state</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">solveOneEq</span> <span class="p">(</span><span class="n" style="color: #333;">delta_tm_cs</span> <span class="n" style="color: #333;">delta</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">mkNegEq</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">l</span><span class="p">)</span></span>
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2115
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<pre style="margin: 0;">+<span id="LC2115" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Refutable shapes] in TmOracle</span></span>
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2116
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<pre style="margin: 0;">+<span id="LC2116" class="line" lang="haskell"> <span class="n" style="color: #333;">us</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">tm_state</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addSolveRefutableAltCon</span> <span class="p">(</span><span class="n" style="color: #333;">delta_tm_cs</span> <span class="n" style="color: #333;">delta</span><span class="p">)</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltLit</span> <span class="n" style="color: #333;">l</span><span class="p">)</span></span>
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2120
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2117
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<pre style="margin: 0;"> <span id="LC2117" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">ValVec</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmNLit</span> <span class="n" style="color: #333;">x</span> <span class="p">[</span><span class="n" style="color: #333;">l</span><span class="p">]</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">vva</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">delta</span> <span class="p">{</span> <span class="n" style="color: #333;">delta_tm_cs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tm_state</span> <span class="p">})]</span></span>
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2121
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2118
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<pre style="margin: 0;"> <span id="LC2118" 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;">[]</span></span>
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2122
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2119
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<pre style="margin: 0;"> <span id="LC2119" 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">@@ -2136,7 +2133,8 @@ pmcheckHd (p@(PmLit l)) ps guards</td>
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2136
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2133
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<pre style="margin: 0;"> <span id="LC2133" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ValVec</span> <span class="n" style="color: #333;">vva</span> <span class="p">(</span><span class="n" style="color: #333;">delta</span> <span class="p">{</span> <span class="n" style="color: #333;">delta_tm_cs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tm_state</span> <span class="p">}))</span></span>
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2137
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2134
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<pre style="margin: 0;"> <span id="LC2134" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">non_matched</span></span>
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2138
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2135
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<pre style="margin: 0;"> <span id="LC2135" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2139
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<pre style="margin: 0;">-<span id="LC2139" class="line" lang="haskell"> <span class="n" style="color: #333;">us</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">tm_state</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">solveOneEq</span> <span class="p">(</span><span class="n" style="color: #333;">delta_tm_cs</span> <span class="n" style="color: #333;">delta</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">mkNegEq</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">l</span><span class="p">)</span></span>
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2136
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<pre style="margin: 0;">+<span id="LC2136" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Refutable shapes] in TmOracle</span></span>
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2137
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<pre style="margin: 0;">+<span id="LC2137" class="line" lang="haskell"> <span class="n" style="color: #333;">us</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">tm_state</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addSolveRefutableAltCon</span> <span class="p">(</span><span class="n" style="color: #333;">delta_tm_cs</span> <span class="n" style="color: #333;">delta</span><span class="p">)</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltLit</span> <span class="n" style="color: #333;">l</span><span class="p">)</span></span>
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2140
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2138
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<pre style="margin: 0;"> <span id="LC2138" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">ValVec</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmNLit</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="n" style="color: #333;">l</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">lits</span><span class="p">)</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">vva</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">delta</span> <span class="p">{</span> <span class="n" style="color: #333;">delta_tm_cs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tm_state</span> <span class="p">})]</span></span>
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<pre style="margin: 0;"> <span id="LC2139" 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;">[]</span></span>
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<pre style="margin: 0;"> <span id="LC2140" 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">@@ -2478,21 +2476,15 @@ isAnyPmCheckEnabled dflags (DsMatchContext kind _loc)</td>
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<pre style="margin: 0;"> <span id="LC2476" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2477" 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;">ValVec</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC2478" 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;">ValVec</span> <span class="n" style="color: #333;">vva</span> <span class="n" style="color: #333;">delta</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC2481" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">residual_eqs</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">subst</span></span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wrapUpTmState</span> <span class="p">(</span><span class="n" style="color: #333;">delta_tm_cs</span> <span class="n" style="color: #333;">delta</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC2482" class="line" lang="haskell"> <span class="n" style="color: #333;">vector</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substInValAbs</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">vva</span></span>
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<pre style="margin: 0;">-<span id="LC2483" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="n" style="color: #333;">ppr<span class="idiff left">_uncovered</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">vector</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">residual_eq</span>s</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2479" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">subst</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">refuts</span></span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wrapUpTmState</span> <span class="p">(</span><span class="n" style="color: #333;">delta_tm_cs</span> <span class="n" style="color: #333;">delta</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2480" class="line" lang="haskell"> <span class="n" style="color: #333;">vector</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substInValAbs</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">vva</span></span>
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<pre style="margin: 0;">+<span id="LC2481" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="n" style="color: #333;">ppr<span class="idiff left">Uncovered</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">vector</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">refut</span>s</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2482" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2483" class="line" lang="haskell"><span class="cd">-- | Apply a term substitution to a value vector abstraction. All VAs are</span></span>
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<pre style="margin: 0;"> <span id="LC2484" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- transformed to PmExpr (used only before pretty printing).</span></span>
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<pre style="margin: 0;"> <span id="LC2485" class="line" lang="haskell"><span class="n" style="color: #333;">substInValAbs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmVarEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">ValAbs</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PmExpr</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC2486" class="line" lang="haskell"><span class="n" style="color: #333;">substInValAbs</span> <span class="n" style="color: #333;">subst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">exprDeepLookup</span> <span class="n" style="color: #333;">subst</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">vaToPmExpr</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2487" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2490" class="line" lang="haskell"><span class="cd">-- | Wrap up the term oracle's state once solving is complete. Drop any</span></span>
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<pre style="margin: 0;">-<span id="LC2491" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- information about unhandled constraints (involving HsExprs) and flatten</span></span>
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<pre style="margin: 0;">-<span id="LC2492" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (height 1) the substitution.</span></span>
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2493
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<pre style="margin: 0;">-<span id="LC2493" class="line" lang="haskell"><span class="n" style="color: #333;">wrapUpTmState</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">ComplexEq</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">PmVarEnv</span><span class="p">)</span></span>
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2494
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<pre style="margin: 0;">-<span id="LC2494" class="line" lang="haskell"><span class="n" style="color: #333;">wrapUpTmState</span> <span class="p">(</span><span class="n" style="color: #333;">residual</span><span class="p">,</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">subst</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">residual</span><span class="p">,</span> <span class="n" style="color: #333;">flattenPmVarEnv</span> <span class="n" style="color: #333;">subst</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC2495" class="line" lang="haskell"></span>
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2496
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2488
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<pre style="margin: 0;"> <span id="LC2488" class="line" lang="haskell"><span class="cd">-- | Issue all the warnings (coverage, exhaustiveness, inaccessibility)</span></span>
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2497
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2489
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<pre style="margin: 0;"> <span id="LC2489" class="line" lang="haskell"><span class="n" style="color: #333;">dsPmWarn</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsMatchContext</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmResult</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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2498
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2490
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<pre style="margin: 0;"> <span id="LC2490" class="line" lang="haskell"><span class="n" style="color: #333;">dsPmWarn</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">ctx</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DsMatchContext</span> <span class="n" style="color: #333;">kind</span> <span class="n" style="color: #333;">loc</span><span class="p">)</span> <span class="n" style="color: #333;">pm_result</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">@@ -2532,10 +2524,11 @@ dsPmWarn dflags ctx@(DsMatchContext kind loc) pm_result</td>
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2532
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2524
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<pre style="margin: 0;"> <span id="LC2524" class="line" lang="haskell"> <span class="n" style="color: #333;">maxPatterns</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">maxUncoveredPatterns</span> <span class="n" style="color: #333;">dflags</span></span>
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2533
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2525
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<pre style="margin: 0;"> <span id="LC2525" class="line" lang="haskell"></span>
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2534
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2526
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<pre style="margin: 0;"> <span id="LC2526" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Print a single clause (for redundant/with-inaccessible-rhs)</span></span>
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2535
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<pre style="margin: 0;">-<span id="LC2535" class="line" lang="haskell"> <span class="n" style="color: #333;">pprEqn</span> <span class="n" style="color: #333;">q</span> <span class="n" style="color: #333;">txt</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pp_context</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="n" style="color: #333;">ctx</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="n" style="color: #333;">txt</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">ppr_eqn</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">kind</span> <span class="n" style="color: #333;">q</span></span>
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2527
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<pre style="margin: 0;">+<span id="LC2527" class="line" lang="haskell"> <span class="n" style="color: #333;">pprEqn</span> <span class="n" style="color: #333;">q</span> <span class="n" style="color: #333;">txt</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprContext</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="n" style="color: #333;">ctx</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="n" style="color: #333;">txt</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">-></span></span>
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2528
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<pre style="margin: 0;">+<span id="LC2528" class="line" lang="haskell"> <span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="n" style="color: #333;">pprPats</span> <span class="n" style="color: #333;">kind</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">q</span><span class="p">))</span></span>
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2536
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2529
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<pre style="margin: 0;"> <span id="LC2529" class="line" lang="haskell"></span>
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2537
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2530
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<pre style="margin: 0;"> <span id="LC2530" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Print several clauses (for uncovered clauses)</span></span>
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2538
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<pre style="margin: 0;">-<span id="LC2538" class="line" lang="haskell"> <span class="n" style="color: #333;">pprEqns</span> <span class="n" style="color: #333;">qs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pp<span class="idiff left right">_c</span>ontext</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="n" style="color: #333;">ctx</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"are non-exhaustive"</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span></span>
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2531
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<pre style="margin: 0;">+<span id="LC2531" class="line" lang="haskell"> <span class="n" style="color: #333;">pprEqns</span> <span class="n" style="color: #333;">qs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pp<span class="idiff left right">rC</span>ontext</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="n" style="color: #333;">ctx</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"are non-exhaustive"</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span></span>
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2539
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2532
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<pre style="margin: 0;"> <span id="LC2532" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">qs</span> <span class="kr" style="font-weight: 600;">of</span> <span class="c1" style="color: #998; font-style: italic;">-- See #11245</span></span>
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2540
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2533
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<pre style="margin: 0;"> <span id="LC2533" class="line" lang="haskell"> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">ValVec</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">]</span></span>
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2541
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2534
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<pre style="margin: 0;"> <span id="LC2534" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Guards do not cover entire pattern space"</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2546" 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="2539" 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">@@ -2546,7 +2539,7 @@ dsPmWarn dflags ctx@(DsMatchContext kind loc) pm_result</td>
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2546
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2539
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<pre style="margin: 0;"> <span id="LC2539" class="line" lang="haskell"></span>
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2547
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2540
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<pre style="margin: 0;"> <span id="LC2540" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Print a type-annotated wildcard (for non-exhaustive `EmptyCase`s for</span></span>
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2548
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2541
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<pre style="margin: 0;"> <span id="LC2541" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- which we only know the type and have no inhabitants at hand)</span></span>
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<td class="diff-line-num old old_line" data-linenumber="2549" 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">
2549
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<pre style="margin: 0;">-<span id="LC2549" class="line" lang="haskell"> <span class="n" style="color: #333;">warnEmptyCase</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pp<span class="idiff left right">_c</span>ontext</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="n" style="color: #333;">ctx</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"are non-exhaustive"</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span></span>
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2542
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<pre style="margin: 0;">+<span id="LC2542" class="line" lang="haskell"> <span class="n" style="color: #333;">warnEmptyCase</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pp<span class="idiff left right">rC</span>ontext</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="n" style="color: #333;">ctx</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"are non-exhaustive"</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span></span>
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2550
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2543
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<pre style="margin: 0;"> <span id="LC2543" class="line" lang="haskell"> <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;">"Patterns not matched:"</span><span class="p">)</span> <span class="mi" style="color: #099;">4</span> <span class="p">(</span><span class="n" style="color: #333;">underscore</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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2551
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2544
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<pre style="margin: 0;"> <span id="LC2544" class="line" lang="haskell"></span>
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2552
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2545
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<pre style="margin: 0;"> <span id="LC2545" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Inaccessible warnings for record updates]</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2618" 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="2611" 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">@@ -2618,8 +2611,8 @@ exhaustiveWarningFlag (StmtCtxt {}) = Nothing -- Don't warn about incomplete pat</td>
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2618
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2611
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<pre style="margin: 0;"> <span id="LC2611" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- incomplete</span></span>
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2619
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2612
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<pre style="margin: 0;"> <span id="LC2612" class="line" lang="haskell"></span>
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2620
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2613
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<pre style="margin: 0;"> <span id="LC2613" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- True <==> singular</span></span>
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2621
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<pre style="margin: 0;">-<span id="LC2621" class="line" lang="haskell"><span class="n" style="color: #333;">pp<span class="idiff left right">_c</span>ontext</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsMatchContext</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">((</span><span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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2622
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<pre style="margin: 0;">-<span id="LC2622" class="line" lang="haskell"><span class="n" style="color: #333;">pp<span class="idiff left right">_c</span>ontext</span> <span class="n" style="color: #333;">singular</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DsMatchContext</span> <span class="n" style="color: #333;">kind</span> <span class="n" style="color: #333;">_loc</span><span class="p">)</span> <span class="n" style="color: #333;">msg</span> <span class="n" style="color: #333;">rest_of_msg_fun</span></span>
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2614
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<pre style="margin: 0;">+<span id="LC2614" class="line" lang="haskell"><span class="n" style="color: #333;">pp<span class="idiff left right">rC</span>ontext</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsMatchContext</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">((</span><span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2615" 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">
2615
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<pre style="margin: 0;">+<span id="LC2615" class="line" lang="haskell"><span class="n" style="color: #333;">pp<span class="idiff left right">rC</span>ontext</span> <span class="n" style="color: #333;">singular</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DsMatchContext</span> <span class="n" style="color: #333;">kind</span> <span class="n" style="color: #333;">_loc</span><span class="p">)</span> <span class="n" style="color: #333;">msg</span> <span class="n" style="color: #333;">rest_of_msg_fun</span></span>
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2623
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2616
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<pre style="margin: 0;"> <span id="LC2616" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span><span class="n" style="color: #333;">text</span> <span class="n" style="color: #333;">txt</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">msg</span><span class="p">,</span></span>
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2624
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2617
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<pre style="margin: 0;"> <span id="LC2617" class="line" lang="haskell"> <span class="n" style="color: #333;">sep</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"In"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr_match</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">char</span> <span class="sc" style="color: #d14;">':'</span></span>
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2625
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2618
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<pre style="margin: 0;"> <span id="LC2618" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">nest</span> <span class="mi" style="color: #099;">4</span> <span class="p">(</span><span class="n" style="color: #333;">rest_of_msg_fun</span> <span class="n" style="color: #333;">pref</span><span class="p">)]]</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2626" 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">@@ -2633,26 +2626,10 @@ pp_context singular (DsMatchContext kind _loc) msg rest_of_msg_fun</td>
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2633
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2626
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<pre style="margin: 0;"> <span id="LC2626" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">pprMatchContext</span> <span class="n" style="color: #333;">kind</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">pp</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fun</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pp</span><span class="p">)</span></span>
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2634
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<td class="diff-line-num new_line" data-linenumber="2627" 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">
2627
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<pre style="margin: 0;"> <span id="LC2627" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">pprMatchContext</span> <span class="n" style="color: #333;">kind</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">pp</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pp</span><span class="p">)</span></span>
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2635
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<td class="diff-line-num new_line" data-linenumber="2628" 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">
2628
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<pre style="margin: 0;"> <span id="LC2628" class="line" lang="haskell"></span>
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2636
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<td class="diff-line-num new_line old" data-linenumber="2629" 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="LC2636" class="line" lang="haskell"><span class="n" style="color: #333;">ppr<span class="idiff left right">_p</span>ats</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsMatchContext</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Pat</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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2637
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<td class="diff-line-num new_line old" data-linenumber="2629" 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="LC2637" class="line" lang="haskell"><span class="n" style="color: #333;">ppr<span class="idiff left right">_p</span>ats</span> <span class="n" style="color: #333;">kind</span> <span class="n" style="color: #333;">pats</span></span>
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<td class="diff-line-num new old_line" data-linenumber="2638" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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2629
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<pre style="margin: 0;">+<span id="LC2629" class="line" lang="haskell"><span class="n" style="color: #333;">ppr<span class="idiff left right">P</span>ats</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsMatchContext</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Pat</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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2630
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<pre style="margin: 0;">+<span id="LC2630" class="line" lang="haskell"><span class="n" style="color: #333;">ppr<span class="idiff left right">P</span>ats</span> <span class="n" style="color: #333;">kind</span> <span class="n" style="color: #333;">pats</span></span>
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2638
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2631
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<pre style="margin: 0;"> <span id="LC2631" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sep</span> <span class="p">[</span><span class="n" style="color: #333;">sep</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">pats</span><span class="p">),</span> <span class="n" style="color: #333;">matchSeparator</span> <span class="n" style="color: #333;">kind</span><span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"..."</span><span class="p">]</span></span>
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2639
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2632
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<pre style="margin: 0;"> <span id="LC2632" class="line" lang="haskell"></span>
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2640
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<pre style="margin: 0;">-<span id="LC2640" class="line" lang="haskell"><span class="n" style="color: #333;">ppr_eqn</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsMatchContext</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LPat</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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2641
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<pre style="margin: 0;">-<span id="LC2641" class="line" lang="haskell"><span class="n" style="color: #333;">ppr_eqn</span> <span class="n" style="color: #333;">prefixF</span> <span class="n" style="color: #333;">kind</span> <span class="n" style="color: #333;">eqn</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">prefixF</span> <span class="p">(</span><span class="n" style="color: #333;">ppr_pats</span> <span class="n" style="color: #333;">kind</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">eqn</span><span class="p">))</span></span>
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2642
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<pre style="margin: 0;">-<span id="LC2642" class="line" lang="haskell"></span>
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2643
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<td class="diff-line-num new_line old" data-linenumber="2633" 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="LC2643" class="line" lang="haskell"><span class="n" style="color: #333;">ppr_constraint</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">,[</span><span class="kt" style="color: #458; font-weight: 600;">PmLit</span><span class="p">])</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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2644
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<td class="diff-line-num new_line old" data-linenumber="2633" 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="LC2644" class="line" lang="haskell"><span class="n" style="color: #333;">ppr_constraint</span> <span class="p">(</span><span class="n" style="color: #333;">var</span><span class="p">,</span> <span class="n" style="color: #333;">lits</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">var</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"is not one of"</span></span>
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2645
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<pre style="margin: 0;">-<span id="LC2645" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">braces</span> <span class="p">(</span><span class="n" style="color: #333;">pprWithCommas</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">lits</span><span class="p">)</span></span>
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2646
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<pre style="margin: 0;">-<span id="LC2646" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2647" class="line" lang="haskell"><span class="n" style="color: #333;">ppr_uncovered</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">PmExpr</span><span class="p">],</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">ComplexEq</span><span class="p">])</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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2648
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<pre style="margin: 0;">-<span id="LC2648" class="line" lang="haskell"><span class="n" style="color: #333;">ppr_uncovered</span> <span class="p">(</span><span class="n" style="color: #333;">expr_vec</span><span class="p">,</span> <span class="n" style="color: #333;">complex</span><span class="p">)</span></span>
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2649
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<pre style="margin: 0;">-<span id="LC2649" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">cs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fsep</span> <span class="n" style="color: #333;">vec</span> <span class="c1" style="color: #998; font-style: italic;">-- there are no literal constraints</span></span>
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2650
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<pre style="margin: 0;">-<span id="LC2650" 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;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">fsep</span> <span class="n" style="color: #333;">vec</span><span class="p">)</span> <span class="mi" style="color: #099;">4</span> <span class="o" style="font-weight: 600;">$</span></span>
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2651
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<pre style="margin: 0;">-<span id="LC2651" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"where"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">vcat</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">ppr_constraint</span> <span class="n" style="color: #333;">cs</span><span class="p">)</span></span>
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2652
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<pre style="margin: 0;">-<span id="LC2652" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2653
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<pre style="margin: 0;">-<span id="LC2653" class="line" lang="haskell"> <span class="n" style="color: #333;">sdoc_vec</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">pprPmExprWithParens</span> <span class="n" style="color: #333;">expr_vec</span></span>
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2654
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<pre style="margin: 0;">-<span id="LC2654" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">vec</span><span class="p">,</span><span class="n" style="color: #333;">cs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">runPmPprM</span> <span class="n" style="color: #333;">sdoc_vec</span> <span class="p">(</span><span class="n" style="color: #333;">filterComplex</span> <span class="n" style="color: #333;">complex</span><span class="p">)</span></span>
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2655
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<pre style="margin: 0;">-<span id="LC2655" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2633" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Representation of Term Equalities]</span></span>
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<pre style="margin: 0;"> <span id="LC2634" 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="LC2635" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In the paper, term constraints always take the form (x ~ e). Of course, a more</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/08c42ce3b5f425654e8ae49ca1c54c1471017d43#7589abbc710cc40f6e48245c2bc16d69f556b714"><strong>compiler/deSugar/PmExpr.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">@@ -8,10 +8,9 @@ Haskell expressions (as used by the pattern matching checker) and utilities.</td>
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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 ViewPatterns #-}</span></span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">PmExpr</span> <span class="p">(</span></span>
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<pre style="margin: 0;">-<span id="LC11" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">PmLit</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">SimpleEq</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ComplexEq</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">toComplex</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">eqPmLit</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC12" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">truePmExpr</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">falsePmExpr</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isTruePmExpr</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isFalsePmExpr</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isNotPmExprOther</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC13" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">lhsExprToPmExpr</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">hsExprToPmExpr</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">substComplexEq</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">filterComplex</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC14" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">pprPmExprWithParens</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">runPmPprM</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">PmLit</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">SimpleEq</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ComplexEq</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">toComplex</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">eqPmLit</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isNotPmExprOther</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lhsExprToPmExpr</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">hsExprToPmExpr</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">substComplexEq</span></span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"> <span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="n" style="color: #333;">include</span> <span class="s" style="color: #d14;">"HsVersions.h"</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -23,19 +22,14 @@ import FastString (FastString, unpackFS)</td>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">HsSyn</span></span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Id</span></span>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Name</span></span>
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<pre style="margin: 0;">-<span id="LC26" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">NameSet</span></span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">DataCon</span></span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">ConLike</span></span>
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<pre style="margin: 0;">-<span id="LC29" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">TcType</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">isStringTy</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">TcType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Type</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff right"> </span><span class="nf" style="color: #900; font-weight: 600;">isStringTy</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">TysWiredIn</span></span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Outputable</span></span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Util</span></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">SrcLoc</span></span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC35" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Maybe</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">mapMaybe</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC36" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">groupBy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">sortBy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">nubBy</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC37" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Monad.Trans.State.Lazy</span></span>
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<pre style="margin: 0;">-<span id="LC38" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC33" 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="LC34" 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="LC35" 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">@@ -61,7 +55,6 @@ refer to variables that are otherwise substituted away.</td>
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span></span>
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="kt" style="color: #458; font-weight: 600;">ConLike</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PmExpr</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC57" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprLit</span> <span class="kt" style="color: #458; font-weight: 600;">PmLit</span></span>
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<pre style="margin: 0;">-<span id="LC64" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprEq</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span> <span class="c1" style="color: #998; font-style: italic;">-- Syntactic equality</span></span>
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<pre style="margin: 0;"> <span id="LC58" 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="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Note [PmExprOther in PmExpr]</span></span>
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<pre style="margin: 0;"> <span id="LC59" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC60" 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">@@ -79,6 +72,23 @@ eqPmLit (PmOLit b1 l1) (PmOLit b2 l2) = b1 == b2 && l1 == l2</td>
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<pre style="margin: 0;"> <span id="LC72" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Undecidable Equality for Overloaded Literals]</span></span>
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<pre style="margin: 0;"> <span id="LC73" class="line" lang="haskell"><span class="n" style="color: #333;">eqPmLit</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;"> <span id="LC74" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC75" class="line" lang="haskell"><span class="cd">-- | Represents a match against a 'ConLike' or literal. We mostly use it to</span></span>
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<pre style="margin: 0;">+<span id="LC76" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- to encode shapes for a variable that immediately lead to a refutation.</span></span>
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<pre style="margin: 0;">+<span id="LC77" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC78" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Refutable shapes] in TmOracle. Really similar to 'CoreSyn.AltCon'.</span></span>
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<pre style="margin: 0;">+<span id="LC79" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PmAltConLike</span> <span class="kt" style="color: #458; font-weight: 600;">ConLike</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC80" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ The types are the argument types of the 'ConLike' application</span></span>
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<pre style="margin: 0;">+<span id="LC81" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">PmAltLit</span> <span class="kt" style="color: #458; font-weight: 600;">PmLit</span></span>
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<pre style="margin: 0;">+<span id="LC82" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC83" class="line" lang="haskell"><span class="cd">-- | This instance won't compare the argument types of the 'ConLike', as we</span></span>
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<pre style="margin: 0;">+<span id="LC84" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- carry them for recovering COMPLETE match groups only. The 'PmRefutEnv' below</span></span>
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<pre style="margin: 0;">+<span id="LC85" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- should never have different 'PmAltConLike's with the same 'ConLike' for the</span></span>
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<pre style="margin: 0;">+<span id="LC86" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- same variable. See Note [Refutable shapes] in TmOracle.</span></span>
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<pre style="margin: 0;">+<span id="LC87" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span> <span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC88" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmAltConLike</span> <span class="n" style="color: #333;">cl1</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;">PmAltConLike</span> <span class="n" style="color: #333;">cl2</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cl1</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">cl2</span></span>
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<pre style="margin: 0;">+<span id="LC89" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmAltLit</span> <span class="n" style="color: #333;">l1</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">PmAltLit</span> <span class="n" style="color: #333;">l2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eqPmLit</span> <span class="n" style="color: #333;">l1</span> <span class="n" style="color: #333;">l2</span></span>
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<pre style="margin: 0;">+<span id="LC90" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">==</span> <span class="kr" style="font-weight: 600;">_</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="LC91" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC92" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Undecidable Equality for Overloaded Literals]</span></span>
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<pre style="margin: 0;"> <span id="LC93" 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="LC94" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Equality on overloaded literals is undecidable in the general case. Consider</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">@@ -145,9 +155,6 @@ impact of this is the following:</td>
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<pre style="margin: 0;"> <span id="LC155" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> appearance of the warnings and is, in practice safe.</span></span>
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<pre style="margin: 0;"> <span id="LC156" 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="LC157" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC148" class="line" lang="haskell"><span class="n" style="color: #333;">nubPmLit</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PmLit</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PmLit</span><span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC149" class="line" lang="haskell"><span class="n" style="color: #333;">nubPmLit</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nubBy</span> <span class="n" style="color: #333;">eqPmLit</span></span>
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<pre style="margin: 0;">-<span id="LC150" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC158" class="line" lang="haskell"><span class="cd">-- | Term equalities</span></span>
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<pre style="margin: 0;"> <span id="LC159" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">SimpleEq</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- We always use this orientation</span></span>
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<pre style="margin: 0;"> <span id="LC160" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">ComplexEq</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExpr</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</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">@@ -156,14 +163,6 @@ type ComplexEq = (PmExpr, PmExpr)</td>
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<pre style="margin: 0;"> <span id="LC163" class="line" lang="haskell"><span class="n" style="color: #333;">toComplex</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SimpleEq</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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<pre style="margin: 0;"> <span id="LC164" class="line" lang="haskell"><span class="n" style="color: #333;">toComplex</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="p">,</span><span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="p">(</span><span class="n" style="color: #333;">idName</span> <span class="n" style="color: #333;">x</span><span class="p">),</span> <span class="n" style="color: #333;">e</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC165" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC159" class="line" lang="haskell"><span class="cd">-- | Expression `True'</span></span>
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<pre style="margin: 0;">-<span id="LC160" class="line" lang="haskell"><span class="n" style="color: #333;">truePmExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span></span>
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<pre style="margin: 0;">-<span id="LC161" class="line" lang="haskell"><span class="n" style="color: #333;">truePmExpr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkPmExprData</span> <span class="n" style="color: #333;">trueDataCon</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;">-<span id="LC162" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC163" class="line" lang="haskell"><span class="cd">-- | Expression `False'</span></span>
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<pre style="margin: 0;">-<span id="LC164" class="line" lang="haskell"><span class="n" style="color: #333;">falsePmExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span></span>
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<pre style="margin: 0;">-<span id="LC165" class="line" lang="haskell"><span class="n" style="color: #333;">falsePmExpr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkPmExprData</span> <span class="n" style="color: #333;">falseDataCon</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;">-<span id="LC166" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC166" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ----------------------------------------------------------------------------</span></span>
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<pre style="margin: 0;"> <span id="LC167" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ** Predicates on PmExpr</span></span>
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<pre style="margin: 0;"> <span id="LC168" 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">@@ -172,38 +171,6 @@ isNotPmExprOther :: PmExpr -> Bool</td>
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<pre style="margin: 0;"> <span id="LC171" class="line" lang="haskell"><span class="n" style="color: #333;">isNotPmExprOther</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprOther</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;">False</span></span>
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<pre style="margin: 0;"> <span id="LC172" class="line" lang="haskell"><span class="n" style="color: #333;">isNotPmExprOther</span> <span class="n" style="color: #333;">_expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;"> <span id="LC173" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC175" class="line" lang="haskell"><span class="cd">-- | Check whether a literal is negated</span></span>
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<pre style="margin: 0;">-<span id="LC176" class="line" lang="haskell"><span class="n" style="color: #333;">isNegatedPmLit</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;">Bool</span></span>
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<pre style="margin: 0;">-<span id="LC177" class="line" lang="haskell"><span class="n" style="color: #333;">isNegatedPmLit</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmOLit</span> <span class="n" style="color: #333;">b</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">b</span></span>
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<pre style="margin: 0;">-<span id="LC178" class="line" lang="haskell"><span class="n" style="color: #333;">isNegatedPmLit</span> <span class="n" style="color: #333;">_other_lit</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="LC179" class="line" lang="haskell"></span>
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180
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<pre style="margin: 0;">-<span id="LC180" class="line" lang="haskell"><span class="cd">-- | Check whether a PmExpr is syntactically equal to term `True'.</span></span>
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181
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<pre style="margin: 0;">-<span id="LC181" class="line" lang="haskell"><span class="n" style="color: #333;">isTruePmExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</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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182
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<pre style="margin: 0;">-<span id="LC182" class="line" lang="haskell"><span class="n" style="color: #333;">isTruePmExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">trueDataCon</span></span>
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183
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<pre style="margin: 0;">-<span id="LC183" class="line" lang="haskell"><span class="n" style="color: #333;">isTruePmExpr</span> <span class="n" style="color: #333;">_other_expr</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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184
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<pre style="margin: 0;">-<span id="LC184" class="line" lang="haskell"></span>
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185
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<pre style="margin: 0;">-<span id="LC185" class="line" lang="haskell"><span class="cd">-- | Check whether a PmExpr is syntactically equal to term `False'.</span></span>
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186
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<pre style="margin: 0;">-<span id="LC186" class="line" lang="haskell"><span class="n" style="color: #333;">isFalsePmExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</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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187
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<pre style="margin: 0;">-<span id="LC187" class="line" lang="haskell"><span class="n" style="color: #333;">isFalsePmExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">falseDataCon</span></span>
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188
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<pre style="margin: 0;">-<span id="LC188" class="line" lang="haskell"><span class="n" style="color: #333;">isFalsePmExpr</span> <span class="n" style="color: #333;">_other_expr</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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189
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<pre style="margin: 0;">-<span id="LC189" class="line" lang="haskell"></span>
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190
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<pre style="margin: 0;">-<span id="LC190" class="line" lang="haskell"><span class="cd">-- | Check whether a PmExpr is syntactically e</span></span>
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191
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<pre style="margin: 0;">-<span id="LC191" class="line" lang="haskell"><span class="n" style="color: #333;">isNilPmExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</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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192
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<pre style="margin: 0;">-<span id="LC192" class="line" lang="haskell"><span class="n" style="color: #333;">isNilPmExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">nilDataCon</span></span>
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193
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<pre style="margin: 0;">-<span id="LC193" class="line" lang="haskell"><span class="n" style="color: #333;">isNilPmExpr</span> <span class="n" style="color: #333;">_other_expr</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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194
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<pre style="margin: 0;">-<span id="LC194" class="line" lang="haskell"></span>
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195
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<pre style="margin: 0;">-<span id="LC195" class="line" lang="haskell"><span class="cd">-- | Check whether a PmExpr is syntactically equal to (x == y).</span></span>
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196
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<pre style="margin: 0;">-<span id="LC196" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Since (==) is overloaded and can have an arbitrary implementation, we use</span></span>
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197
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<pre style="margin: 0;">-<span id="LC197" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the PmExprEq constructor to represent only equalities with non-overloaded</span></span>
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198
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<pre style="margin: 0;">-<span id="LC198" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- literals where it coincides with a syntactic equality check.</span></span>
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<td class="diff-line-num old old_line" data-linenumber="199" 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">
199
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<pre style="margin: 0;">-<span id="LC199" class="line" lang="haskell"><span class="n" style="color: #333;">isPmExprEq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExpr</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC200" class="line" lang="haskell"><span class="n" style="color: #333;">isPmExprEq</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprEq</span> <span class="n" style="color: #333;">e1</span> <span class="n" style="color: #333;">e2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">e1</span><span class="p">,</span><span class="n" style="color: #333;">e2</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC201" class="line" lang="haskell"><span class="n" style="color: #333;">isPmExprEq</span> <span class="n" style="color: #333;">_other_expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<pre style="margin: 0;">-<span id="LC202" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC203" class="line" lang="haskell"><span class="cd">-- | Check if a DataCon is (:).</span></span>
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<pre style="margin: 0;">-<span id="LC204" class="line" lang="haskell"><span class="n" style="color: #333;">isConsDataCon</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DataCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">-<span id="LC205" class="line" lang="haskell"><span class="n" style="color: #333;">isConsDataCon</span> <span class="n" style="color: #333;">con</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">consDataCon</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">con</span></span>
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<pre style="margin: 0;">-<span id="LC206" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC174" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ----------------------------------------------------------------------------</span></span>
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<pre style="margin: 0;"> <span id="LC175" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ** Substitution in PmExpr</span></span>
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<pre style="margin: 0;"> <span id="LC176" 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">@@ -216,9 +183,6 @@ substPmExpr x e1 e =</td>
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<pre style="margin: 0;"> <span id="LC183" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">e</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC184" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c</span> <span class="n" style="color: #333;">ps</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">ps'</span><span class="p">,</span> <span class="n" style="color: #333;">bs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapAndUnzip</span> <span class="p">(</span><span class="n" style="color: #333;">substPmExpr</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e1</span><span class="p">)</span> <span class="n" style="color: #333;">ps</span></span>
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<pre style="margin: 0;"> <span id="LC185" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c</span> <span class="n" style="color: #333;">ps'</span><span class="p">,</span> <span class="n" style="color: #333;">or</span> <span class="n" style="color: #333;">bs</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC219" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmExprEq</span> <span class="n" style="color: #333;">ex</span> <span class="n" style="color: #333;">ey</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">ex'</span><span class="p">,</span> <span class="n" style="color: #333;">bx</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substPmExpr</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e1</span> <span class="n" style="color: #333;">ex</span></span>
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<pre style="margin: 0;">-<span id="LC220" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ey'</span><span class="p">,</span> <span class="n" style="color: #333;">by</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substPmExpr</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e1</span> <span class="n" style="color: #333;">ey</span></span>
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<pre style="margin: 0;">-<span id="LC221" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprEq</span> <span class="n" style="color: #333;">ex'</span> <span class="n" style="color: #333;">ey'</span><span class="p">,</span> <span class="n" style="color: #333;">bx</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">by</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC186" class="line" lang="haskell"> <span class="n" style="color: #333;">_other_expr</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">e</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- The rest are terminals (We silently ignore</span></span>
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<pre style="margin: 0;"> <span id="LC187" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Other). See Note [PmExprOther in PmExpr]</span></span>
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<pre style="margin: 0;"> <span id="LC188" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="312" 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="276" 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">@@ -312,155 +276,26 @@ stringExprToList src s = foldr cons nil (map charToPmExpr (unpackFS s))</td>
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<pre style="margin: 0;"> <span id="LC276" 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="LC277" 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="LC278" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC315" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- 1. Literals</span></span>
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<pre style="margin: 0;">-<span id="LC316" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC317" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Starting with a function definition like:</span></span>
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<pre style="margin: 0;">-<span id="LC318" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC319" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: Int -> Bool</span></span>
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<pre style="margin: 0;">-<span id="LC320" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f 5 = True</span></span>
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<pre style="margin: 0;">-<span id="LC321" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f 6 = True</span></span>
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<pre style="margin: 0;">-<span id="LC322" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC323" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The uncovered set looks like:</span></span>
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<pre style="margin: 0;">-<span id="LC324" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> { var |> False == (var == 5), False == (var == 6) }</span></span>
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<pre style="margin: 0;">-<span id="LC325" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC326" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Yet, we would like to print this nicely as follows:</span></span>
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<pre style="margin: 0;">-<span id="LC327" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> x , where x not one of {5,6}</span></span>
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<pre style="margin: 0;">-<span id="LC328" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC329" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Function `filterComplex' takes the set of residual constraints and packs</span></span>
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<pre style="margin: 0;">-<span id="LC330" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">together the negative constraints that refer to the same variable so we can do</span></span>
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<pre style="margin: 0;">-<span id="LC331" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">just this. Since these variables will be shown to the programmer, we also give</span></span>
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<pre style="margin: 0;">-<span id="LC332" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">them better names (t1, t2, ..), hence the SDoc in PmNegLitCt.</span></span>
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<pre style="margin: 0;">-<span id="LC333" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC334" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">2. Residual Constraints</span></span>
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<pre style="margin: 0;">-<span id="LC335" 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="LC336" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Unhandled constraints that refer to HsExpr are typically ignored by the solver</span></span>
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<pre style="margin: 0;">-<span id="LC337" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(it does not even substitute in HsExpr so they are even printed as wildcards).</span></span>
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<pre style="margin: 0;">-<span id="LC338" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Additionally, the oracle returns a substitution if it succeeds so we apply this</span></span>
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<pre style="margin: 0;">-<span id="LC339" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">substitution to the vectors before printing them out (see function `pprOne' in</span></span>
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<pre style="margin: 0;">-<span id="LC340" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Check.hs) to be more precice.</span></span>
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<pre style="margin: 0;">-<span id="LC341" 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="LC342" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC343" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- -----------------------------------------------------------------------------</span></span>
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<pre style="margin: 0;">-<span id="LC344" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ** Transform residual constraints in appropriate form for pretty printing</span></span>
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<pre style="margin: 0;">-<span id="LC345" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC346" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">PmNegLitCt</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">,</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PmLit</span><span class="p">]))</span></span>
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<pre style="margin: 0;">-<span id="LC347" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC348" class="line" lang="haskell"><span class="n" style="color: #333;">filterComplex</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">ComplexEq</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PmNegLitCt</span><span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC349" class="line" lang="haskell"><span class="n" style="color: #333;">filterComplex</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">zipWith</span> <span class="n" style="color: #333;">rename</span> <span class="n" style="color: #333;">nameList</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">mkGroup</span></span>
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<pre style="margin: 0;">-<span id="LC350" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">groupBy</span> <span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">sortBy</span> <span class="n" style="color: #333;">order</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">mapMaybe</span> <span class="n" style="color: #333;">isNegLitCs</span></span>
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<pre style="margin: 0;">-<span id="LC351" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC352" class="line" lang="haskell"> <span class="n" style="color: #333;">order</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">compare</span> <span class="p">(</span><span class="n" style="color: #333;">fst</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">fst</span> <span class="n" style="color: #333;">y</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC353" class="line" lang="haskell"> <span class="n" style="color: #333;">name</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fst</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">fst</span> <span class="n" style="color: #333;">y</span></span>
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<pre style="margin: 0;">-<span id="LC354" class="line" lang="haskell"> <span class="n" style="color: #333;">mkGroup</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">fst</span> <span class="p">(</span><span class="n" style="color: #333;">head</span> <span class="n" style="color: #333;">l</span><span class="p">),</span> <span class="n" style="color: #333;">nubPmLit</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">snd</span> <span class="n" style="color: #333;">l</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC355" class="line" lang="haskell"> <span class="n" style="color: #333;">rename</span> <span class="n" style="color: #333;">new</span> <span class="p">(</span><span class="n" style="color: #333;">old</span><span class="p">,</span> <span class="n" style="color: #333;">lits</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">old</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">new</span><span class="p">,</span> <span class="n" style="color: #333;">lits</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC356" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC357" class="line" lang="haskell"> <span class="n" style="color: #333;">isNegLitCs</span> <span class="p">(</span><span class="n" style="color: #333;">e1</span><span class="p">,</span><span class="n" style="color: #333;">e2</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC358" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isFalsePmExpr</span> <span class="n" style="color: #333;">e1</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="p">,</span><span class="n" style="color: #333;">y</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isPmExprEq</span> <span class="n" style="color: #333;">e2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isNegLitCs'</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span></span>
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359
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<pre style="margin: 0;">-<span id="LC359" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isFalsePmExpr</span> <span class="n" style="color: #333;">e2</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="p">,</span><span class="n" style="color: #333;">y</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isPmExprEq</span> <span class="n" style="color: #333;">e1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isNegLitCs'</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span></span>
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360
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<pre style="margin: 0;">-<span id="LC360" 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;">Nothing</span></span>
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361
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<pre style="margin: 0;">-<span id="LC361" class="line" lang="haskell"></span>
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362
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<pre style="margin: 0;">-<span id="LC362" class="line" lang="haskell"> <span class="n" style="color: #333;">isNegLitCs'</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprLit</span> <span class="n" style="color: #333;">l</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="n" style="color: #333;">l</span><span class="p">)</span></span>
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363
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<pre style="margin: 0;">-<span id="LC363" class="line" lang="haskell"> <span class="n" style="color: #333;">isNegLitCs'</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprLit</span> <span class="n" style="color: #333;">l</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="n" style="color: #333;">l</span><span class="p">)</span></span>
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364
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<pre style="margin: 0;">-<span id="LC364" class="line" lang="haskell"> <span class="n" style="color: #333;">isNegLitCs'</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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365
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<pre style="margin: 0;">-<span id="LC365" class="line" lang="haskell"></span>
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366
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<pre style="margin: 0;">-<span id="LC366" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Try nice names p,q,r,s,t before using the (ugly) t_i</span></span>
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367
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<pre style="margin: 0;">-<span id="LC367" class="line" lang="haskell"> <span class="n" style="color: #333;">nameList</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">]</span></span>
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368
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<pre style="margin: 0;">-<span id="LC368" class="line" lang="haskell"> <span class="n" style="color: #333;">nameList</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">text</span> <span class="p">[</span><span class="s" style="color: #d14;">"p"</span><span class="p">,</span><span class="s" style="color: #d14;">"q"</span><span class="p">,</span><span class="s" style="color: #d14;">"r"</span><span class="p">,</span><span class="s" style="color: #d14;">"s"</span><span class="p">,</span><span class="s" style="color: #d14;">"t"</span><span class="p">]</span> <span class="o" style="font-weight: 600;">++</span></span>
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369
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<pre style="margin: 0;">-<span id="LC369" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="p">(</span><span class="sc" style="color: #d14;">'t'</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">show</span> <span class="n" style="color: #333;">u</span><span class="p">)</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">u</span> <span class="o" style="font-weight: 600;"><-</span> <span class="p">[(</span><span class="mi" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="p">)</span><span class="o" style="font-weight: 600;">..</span><span class="p">]</span> <span class="p">]</span></span>
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370
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<pre style="margin: 0;">-<span id="LC370" class="line" lang="haskell"></span>
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371
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<pre style="margin: 0;">-<span id="LC371" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ----------------------------------------------------------------------------</span></span>
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372
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<pre style="margin: 0;">-<span id="LC372" class="line" lang="haskell"></span>
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373
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<pre style="margin: 0;">-<span id="LC373" class="line" lang="haskell"><span class="n" style="color: #333;">runPmPprM</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmPprM</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PmNegLitCt</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">,[</span><span class="kt" style="color: #458; font-weight: 600;">PmLit</span><span class="p">])])</span></span>
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374
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<pre style="margin: 0;">-<span id="LC374" class="line" lang="haskell"><span class="n" style="color: #333;">runPmPprM</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">lit_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">result</span><span class="p">,</span> <span class="n" style="color: #333;">mapMaybe</span> <span class="n" style="color: #333;">is_used</span> <span class="n" style="color: #333;">lit_env</span><span class="p">)</span></span>
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375
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<pre style="margin: 0;">-<span id="LC375" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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376
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<pre style="margin: 0;">-<span id="LC376" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">result</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">_lit_env</span><span class="p">,</span> <span class="n" style="color: #333;">used</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">runState</span> <span class="n" style="color: #333;">m</span> <span class="p">(</span><span class="n" style="color: #333;">lit_env</span><span class="p">,</span> <span class="n" style="color: #333;">emptyNameSet</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC377" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC378" class="line" lang="haskell"> <span class="n" style="color: #333;">is_used</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="p">,(</span><span class="n" style="color: #333;">name</span><span class="p">,</span> <span class="n" style="color: #333;">lits</span><span class="p">))</span></span>
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379
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<pre style="margin: 0;">-<span id="LC379" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">elemNameSet</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">used</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">name</span><span class="p">,</span> <span class="n" style="color: #333;">lits</span><span class="p">)</span></span>
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380
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<pre style="margin: 0;">-<span id="LC380" 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;">Nothing</span></span>
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381
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<pre style="margin: 0;">-<span id="LC381" class="line" lang="haskell"></span>
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382
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<pre style="margin: 0;">-<span id="LC382" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">PmPprM</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;">State</span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">PmNegLitCt</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">NameSet</span><span class="p">)</span> <span class="n" style="color: #333;">a</span></span>
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383
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<pre style="margin: 0;">-<span id="LC383" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (the first part of the state is read only. make it a reader?)</span></span>
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384
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<pre style="margin: 0;">-<span id="LC384" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC385" class="line" lang="haskell"><span class="n" style="color: #333;">addUsed</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmPprM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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386
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<pre style="margin: 0;">-<span id="LC386" class="line" lang="haskell"><span class="n" style="color: #333;">addUsed</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">modify</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">(</span><span class="n" style="color: #333;">negated</span><span class="p">,</span> <span class="n" style="color: #333;">used</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">negated</span><span class="p">,</span> <span class="n" style="color: #333;">extendNameSet</span> <span class="n" style="color: #333;">used</span> <span class="n" style="color: #333;">x</span><span class="p">))</span></span>
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387
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<pre style="margin: 0;">-<span id="LC387" class="line" lang="haskell"></span>
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388
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<pre style="margin: 0;">-<span id="LC388" class="line" lang="haskell"><span class="n" style="color: #333;">checkNegation</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmPprM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- the clean name if it is negated</span></span>
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389
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<pre style="margin: 0;">-<span id="LC389" class="line" lang="haskell"><span class="n" style="color: #333;">checkNegation</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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390
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<pre style="margin: 0;">-<span id="LC390" class="line" lang="haskell"> <span class="n" style="color: #333;">negated</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">gets</span> <span class="n" style="color: #333;">fst</span></span>
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391
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<pre style="margin: 0;">-<span id="LC391" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lookup</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">negated</span> <span class="kr" style="font-weight: 600;">of</span></span>
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392
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<pre style="margin: 0;">-<span id="LC392" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">new</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">new</span></span>
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393
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<pre style="margin: 0;">-<span id="LC393" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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394
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<pre style="margin: 0;">-<span id="LC394" class="line" lang="haskell"></span>
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395
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<pre style="margin: 0;">-<span id="LC395" class="line" lang="haskell"><span class="cd">-- | Pretty print a pmexpr, but remember to prettify the names of the variables</span></span>
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396
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<pre style="margin: 0;">-<span id="LC396" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- that refer to neg-literals. The ones that cannot be shown are printed as</span></span>
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397
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<pre style="margin: 0;">-<span id="LC397" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- underscores.</span></span>
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398
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<pre style="margin: 0;">-<span id="LC398" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmPprM</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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399
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<pre style="margin: 0;">-<span id="LC399" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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400
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<pre style="margin: 0;">-<span id="LC400" class="line" lang="haskell"> <span class="n" style="color: #333;">mb_name</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkNegation</span> <span class="n" style="color: #333;">x</span></span>
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401
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<pre style="margin: 0;">-<span id="LC401" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">mb_name</span> <span class="kr" style="font-weight: 600;">of</span></span>
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402
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<pre style="margin: 0;">-<span id="LC402" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addUsed</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">>></span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">name</span></span>
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403
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<pre style="margin: 0;">-<span id="LC403" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">underscore</span></span>
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404
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<pre style="margin: 0;">-<span id="LC404" class="line" lang="haskell"></span>
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405
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<pre style="margin: 0;">-<span id="LC405" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">args</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPmExprCon</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">args</span></span>
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406
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<pre style="margin: 0;">-<span id="LC406" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprLit</span> <span class="n" style="color: #333;">l</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">l</span><span class="p">)</span></span>
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407
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<pre style="margin: 0;">-<span id="LC407" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprEq</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">underscore</span> <span class="c1" style="color: #998; font-style: italic;">-- don't show</span></span>
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408
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<pre style="margin: 0;">-<span id="LC408" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprOther</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">underscore</span> <span class="c1" style="color: #998; font-style: italic;">-- don't show</span></span>
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409
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<pre style="margin: 0;">-<span id="LC409" class="line" lang="haskell"></span>
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410
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<pre style="margin: 0;">-<span id="LC410" class="line" lang="haskell"><span class="n" style="color: #333;">needsParens</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</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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411
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<pre style="margin: 0;">-<span id="LC411" class="line" lang="haskell"><span class="n" style="color: #333;">needsParens</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprVar</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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412
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<pre style="margin: 0;">-<span id="LC412" class="line" lang="haskell"><span class="n" style="color: #333;">needsParens</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprLit</span> <span class="n" style="color: #333;">l</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isNegatedPmLit</span> <span class="n" style="color: #333;">l</span></span>
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413
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<pre style="margin: 0;">-<span id="LC413" class="line" lang="haskell"><span class="n" style="color: #333;">needsParens</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprEq</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 class="c1" style="color: #998; font-style: italic;">-- will become a wildcard</span></span>
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414
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<pre style="margin: 0;">-<span id="LC414" class="line" lang="haskell"><span class="n" style="color: #333;">needsParens</span> <span class="p">(</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="kt" style="color: #458; font-weight: 600;">False</span> <span class="c1" style="color: #998; font-style: italic;">-- will become a wildcard</span></span>
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415
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<pre style="margin: 0;">-<span id="LC415" class="line" lang="haskell"><span class="n" style="color: #333;">needsParens</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">c</span><span class="p">)</span> <span class="n" style="color: #333;">es</span><span class="p">)</span></span>
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416
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<pre style="margin: 0;">-<span id="LC416" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTupleDataCon</span> <span class="n" style="color: #333;">c</span></span>
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417
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<pre style="margin: 0;">-<span id="LC417" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">isConsDataCon</span> <span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">es</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="LC418" 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;">True</span></span>
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<pre style="margin: 0;">-<span id="LC419" class="line" lang="haskell"><span class="n" style="color: #333;">needsParens</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PatSynCon</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="n" style="color: #333;">es</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">es</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC420" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC421" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExprWithParens</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmPprM</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<pre style="margin: 0;">-<span id="LC422" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExprWithParens</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;">-<span id="LC423" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">needsParens</span> <span class="n" style="color: #333;">expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">parens</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">pprPmExpr</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;">-<span id="LC424" 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;">pprPmExpr</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;">-<span id="LC425" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC426" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExprCon</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;">PmExpr</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmPprM</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<pre style="margin: 0;">-<span id="LC427" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExprCon</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">con</span><span class="p">)</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">-<span id="LC428" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTupleDataCon</span> <span class="n" style="color: #333;">con</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTuple</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">pprPmExpr</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">-<span id="LC429" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isConsDataCon</span> <span class="n" style="color: #333;">con</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pretty_list</span></span>
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<pre style="margin: 0;">-<span id="LC430" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC431" class="line" lang="haskell"> <span class="n" style="color: #333;">mkTuple</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<pre style="margin: 0;">-<span id="LC432" class="line" lang="haskell"> <span class="n" style="color: #333;">mkTuple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">parens</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">fsep</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">punctuate</span> <span class="n" style="color: #333;">comma</span></span>
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<pre style="margin: 0;">-<span id="LC433" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC434" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- lazily, to be used in the list case only</span></span>
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<pre style="margin: 0;">-<span id="LC435" class="line" lang="haskell"> <span class="n" style="color: #333;">pretty_list</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmPprM</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<pre style="margin: 0;">-<span id="LC436" class="line" lang="haskell"> <span class="n" style="color: #333;">pretty_list</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">isNilPmExpr</span> <span class="p">(</span><span class="n" style="color: #333;">last</span> <span class="n" style="color: #333;">list</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="LC437" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">brackets</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">fsep</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">punctuate</span> <span class="n" style="color: #333;">comma</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">pprPmExpr</span> <span class="p">(</span><span class="n" style="color: #333;">init</span> <span class="n" style="color: #333;">list</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC438" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">parens</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">hcat</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">punctuate</span> <span class="n" style="color: #333;">colon</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">pprPmExpr</span> <span class="n" style="color: #333;">list</span></span>
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<pre style="margin: 0;">-<span id="LC439" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC440" class="line" lang="haskell"> <span class="n" style="color: #333;">list</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">list_elements</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">-<span id="LC441" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC442" class="line" lang="haskell"> <span class="n" style="color: #333;">list_elements</span> <span class="p">[</span><span class="n" style="color: #333;">x</span><span class="p">,</span><span class="n" style="color: #333;">y</span><span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC443" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c</span> <span class="n" style="color: #333;">es</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">y</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">nilDataCon</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">c</span></span>
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<pre style="margin: 0;">-<span id="LC444" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span><span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">es</span><span class="p">)</span> <span class="p">[</span><span class="n" style="color: #333;">x</span><span class="p">,</span><span class="n" style="color: #333;">y</span><span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC445" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c</span> <span class="n" style="color: #333;">es</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">y</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">consDataCon</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">c</span></span>
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<pre style="margin: 0;">-<span id="LC446" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">list_elements</span> <span class="n" style="color: #333;">es</span></span>
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<pre style="margin: 0;">-<span id="LC447" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="n" style="color: #333;">x</span><span class="p">,</span><span class="n" style="color: #333;">y</span><span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC448" class="line" lang="haskell"> <span class="n" style="color: #333;">list_elements</span> <span class="n" style="color: #333;">list</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"list_elements:"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">list</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC449" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExprCon</span> <span class="n" style="color: #333;">cl</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">-<span id="LC450" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">conLikeIsInfix</span> <span class="n" style="color: #333;">cl</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">args</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC451" class="line" lang="haskell"> <span class="p">[</span><span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="n" style="color: #333;">y</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="n" style="color: #333;">x'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pprPmExprWithParens</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">-<span id="LC452" class="line" lang="haskell"> <span class="n" style="color: #333;">y'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pprPmExprWithParens</span> <span class="n" style="color: #333;">y</span></span>
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<pre style="margin: 0;">-<span id="LC453" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">x'</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cl</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">y'</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC454" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- can it be infix but have more than two arguments?</span></span>
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<pre style="margin: 0;">-<span id="LC455" class="line" lang="haskell"> <span class="n" style="color: #333;">list</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"pprPmExprCon:"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">list</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC456" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cl</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC457" 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 class="n" style="color: #333;">args'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">pprPmExprWithParens</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">-<span id="LC458" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">fsep</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cl</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">args'</span><span class="p">))</span></span>
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459
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<pre style="margin: 0;">-<span id="LC459" class="line" lang="haskell"></span>
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460
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<pre style="margin: 0;"> <span id="LC279" 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;">PmLit</span> <span class="kr" style="font-weight: 600;">where</span></span>
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461
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<pre style="margin: 0;"> <span id="LC280" 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;">PmSLit</span> <span class="n" style="color: #333;">l</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pmPprHsLit</span> <span class="n" style="color: #333;">l</span></span>
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462
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281
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<pre style="margin: 0;"> <span id="LC281" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmOLit</span> <span class="n" style="color: #333;">neg</span> <span class="n" style="color: #333;">l</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">neg</span> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">char</span> <span class="sc" style="color: #d14;">'-'</span> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">empty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">l</span></span>
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463
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<pre style="margin: 0;"> <span id="LC282" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC464" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- not really useful for pmexprs per se</span></span>
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<pre style="margin: 0;"> <span id="LC283" 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;">PmExpr</span> <span class="kr" style="font-weight: 600;">where</span></span>
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466
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<pre style="margin: 0;">-<span id="LC466" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fst</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">runPmPprM</span> <span class="p">(</span><span class="n" style="color: #333;">pprPmExpr</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span></pre>
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<pre style="margin: 0;">+<span id="LC284" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="mi" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC285" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC286" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprLit</span> <span class="n" style="color: #333;">l</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">l</span></span>
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<pre style="margin: 0;">+<span id="LC287" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">v</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">v</span></span>
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288
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<pre style="margin: 0;">+<span id="LC288" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprOther</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;">angleBrackets</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>
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<pre style="margin: 0;">+<span id="LC289" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</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="n" style="color: #333;">args</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC290" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTupleDataCon</span> <span class="n" style="color: #333;">dc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">parens</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">comma_sep</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">+<span id="LC291" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">dc</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">consDataCon</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">brackets</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">comma_sep</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">list_cells</span> <span class="n" style="color: #333;">args</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC292" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC293" class="line" lang="haskell"> <span class="n" style="color: #333;">comma_sep</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fsep</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">punctuate</span> <span class="n" style="color: #333;">comma</span></span>
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294
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<pre style="margin: 0;">+<span id="LC294" class="line" lang="haskell"> <span class="n" style="color: #333;">list_cells</span> <span class="p">(</span><span class="n" style="color: #333;">hd</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">tl</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hd</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">list_cells</span> <span class="n" style="color: #333;">tl</span></span>
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295
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<pre style="margin: 0;">+<span id="LC295" class="line" lang="haskell"> <span class="n" style="color: #333;">list_cells</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;">[]</span></span>
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296
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<pre style="margin: 0;">+<span id="LC296" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">prec</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">cl</span> <span class="n" style="color: #333;">args</span><span class="p">)</span></span>
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297
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<pre style="margin: 0;">+<span id="LC297" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cparen</span> <span class="p">(</span><span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">prec</span> <span class="o" style="font-weight: 600;">></span> <span class="mi" style="color: #099;">0</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">hcat</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cl</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">go</span> <span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="n" style="color: #333;">args</span><span class="p">))</span></span>
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298
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<pre style="margin: 0;">+<span id="LC298" class="line" lang="haskell"></span>
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299
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<pre style="margin: 0;">+<span id="LC299" 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;">PmAltCon</span> <span class="kr" style="font-weight: 600;">where</span></span>
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300
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<pre style="margin: 0;">+<span id="LC300" 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;">PmAltConLike</span> <span class="n" style="color: #333;">cl</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cl</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">char</span> <span class="sc" style="color: #d14;">'@'</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tys</span></span>
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301
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<pre style="margin: 0;">+<span id="LC301" 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;">PmAltLit</span> <span class="n" style="color: #333;">l</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">l</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/08c42ce3b5f425654e8ae49ca1c54c1471017d43#584407121afc66978c814dbdb5c252118d27656a"><strong>compiler/deSugar/PmPpr.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE CPP #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="cd">-- | Provides factilities for pretty-printing 'PmExpr's in a way approriate for</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- user facing pattern match warnings.</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">PmPpr</span> <span class="p">(</span></span>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">pprUncovered</span></span>
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7
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"> <span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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8
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"></span>
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9
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="n" style="color: #333;">include</span> <span class="s" style="color: #d14;">"HsVersions.h"</span></span>
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10
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GhcPrelude</span></span>
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12
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Name</span></span>
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14
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">NameEnv</span></span>
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15
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">NameSet</span></span>
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16
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">UniqDFM</span></span>
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17
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">UniqSet</span></span>
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18
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">ConLike</span></span>
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19
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">DataCon</span></span>
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20
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">TysWiredIn</span></span>
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21
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Outputable</span></span>
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22
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Monad.Trans.State.Strict</span></span>
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23
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Maybes</span></span>
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24
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Util</span></span>
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25
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"></span>
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26
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">TmOracle</span></span>
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27
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"><span class="cd">-- | Pretty-print the guts of an uncovered value vector abstraction, i.e., its</span></span>
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29
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- components and refutable shapes associated to any mentioned variables.</span></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Example for @([Just p, q], [p :-> [3,4], q :-> [0,5]]):</span></span>
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32
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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33
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @</span></span>
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34
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (Just p) q</span></span>
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35
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- where p is not one of {3, 4}</span></span>
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36
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- q is not one of {0, 5}</span></span>
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37
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @</span></span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="haskell"><span class="n" style="color: #333;">pprUncovered</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">PmExpr</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">PmRefutEnv</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="haskell"><span class="n" style="color: #333;">pprUncovered</span> <span class="p">(</span><span class="n" style="color: #333;">expr_vec</span><span class="p">,</span> <span class="n" style="color: #333;">refuts</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">cs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fsep</span> <span class="n" style="color: #333;">vec</span> <span class="c1" style="color: #998; font-style: italic;">-- there are no literal constraints</span></span>
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<pre style="margin: 0;">+<span id="LC41" 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;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">fsep</span> <span class="n" style="color: #333;">vec</span><span class="p">)</span> <span class="mi" style="color: #099;">4</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC42" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"where"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">vcat</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">pprRefutableShapes</span> <span class="n" style="color: #333;">cs</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC44" class="line" lang="haskell"> <span class="n" style="color: #333;">sdoc_vec</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">pprPmExprWithParens</span> <span class="n" style="color: #333;">expr_vec</span></span>
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<pre style="margin: 0;">+<span id="LC45" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">vec</span><span class="p">,</span><span class="n" style="color: #333;">cs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">runPmPpr</span> <span class="n" style="color: #333;">sdoc_vec</span> <span class="p">(</span><span class="n" style="color: #333;">prettifyRefuts</span> <span class="n" style="color: #333;">refuts</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC46" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC47" class="line" lang="haskell"><span class="cd">-- | Output refutable shapes of a variable in the form of @var is not one of {2,</span></span>
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Nothing, 3}@.</span></span>
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<pre style="margin: 0;">+<span id="LC49" class="line" lang="haskell"><span class="n" style="color: #333;">pprRefutableShapes</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">,[</span><span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span><span class="p">])</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<pre style="margin: 0;">+<span id="LC50" class="line" lang="haskell"><span class="n" style="color: #333;">pprRefutableShapes</span> <span class="p">(</span><span class="n" style="color: #333;">var</span><span class="p">,</span> <span class="n" style="color: #333;">alts</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC51" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">var</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"is not one of"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">braces</span> <span class="p">(</span><span class="n" style="color: #333;">pprWithCommas</span> <span class="n" style="color: #333;">ppr_alt</span> <span class="n" style="color: #333;">alts</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC52" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC53" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr_alt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltLit</span> <span class="n" style="color: #333;">lit</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">lit</span></span>
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<pre style="margin: 0;">+<span id="LC54" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr_alt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltConLike</span> <span class="n" style="color: #333;">cl</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cl</span></span>
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<pre style="margin: 0;">+<span id="LC55" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC56" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- 1. Literals</span></span>
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<pre style="margin: 0;">+<span id="LC57" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">+<span id="LC58" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Starting with a function definition like:</span></span>
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<pre style="margin: 0;">+<span id="LC59" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC60" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: Int -> Bool</span></span>
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<pre style="margin: 0;">+<span id="LC61" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f 5 = True</span></span>
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<pre style="margin: 0;">+<span id="LC62" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f 6 = True</span></span>
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<pre style="margin: 0;">+<span id="LC63" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC64" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The uncovered set looks like:</span></span>
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<pre style="margin: 0;">+<span id="LC65" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> { var |> var /= 5, var /= 6 }</span></span>
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<pre style="margin: 0;">+<span id="LC66" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC67" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Yet, we would like to print this nicely as follows:</span></span>
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<pre style="margin: 0;">+<span id="LC68" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> x , where x not one of {5,6}</span></span>
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<pre style="margin: 0;">+<span id="LC69" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC70" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Since these variables will be shown to the programmer, we give them better names</span></span>
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<pre style="margin: 0;">+<span id="LC71" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(t1, t2, ..) in 'prettifyRefuts', hence the SDoc in 'PrettyPmRefutEnv'.</span></span>
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<pre style="margin: 0;">+<span id="LC72" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC73" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">2. Residual Constraints</span></span>
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<pre style="margin: 0;">+<span id="LC74" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">+<span id="LC75" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Unhandled constraints that refer to HsExpr are typically ignored by the solver</span></span>
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<pre style="margin: 0;">+<span id="LC76" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(it does not even substitute in HsExpr so they are even printed as wildcards).</span></span>
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<pre style="margin: 0;">+<span id="LC77" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Additionally, the oracle returns a substitution if it succeeds so we apply this</span></span>
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<pre style="margin: 0;">+<span id="LC78" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">substitution to the vectors before printing them out (see function `pprOne' in</span></span>
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<pre style="margin: 0;">+<span id="LC79" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Check.hs) to be more precise.</span></span>
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<pre style="margin: 0;">+<span id="LC80" 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="LC81" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC82" class="line" lang="haskell"><span class="cd">-- | A 'PmRefutEnv' with pretty names for the occuring variables.</span></span>
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<pre style="margin: 0;">+<span id="LC83" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">PrettyPmRefutEnv</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">DNameEnv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span><span class="p">])</span></span>
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<pre style="margin: 0;">+<span id="LC84" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC85" class="line" lang="haskell"><span class="cd">-- | Assigns pretty names to constraint variables in the domain of the given</span></span>
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<pre style="margin: 0;">+<span id="LC86" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'PmRefutEnv'.</span></span>
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<pre style="margin: 0;">+<span id="LC87" class="line" lang="haskell"><span class="n" style="color: #333;">prettifyRefuts</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmRefutEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PrettyPmRefutEnv</span></span>
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<pre style="margin: 0;">+<span id="LC88" class="line" lang="haskell"><span class="n" style="color: #333;">prettifyRefuts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">listToUDFM</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">zipWith</span> <span class="n" style="color: #333;">rename</span> <span class="n" style="color: #333;">nameList</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">udfmToList</span></span>
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<pre style="margin: 0;">+<span id="LC89" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC90" class="line" lang="haskell"> <span class="n" style="color: #333;">rename</span> <span class="n" style="color: #333;">new</span> <span class="p">(</span><span class="n" style="color: #333;">old</span><span class="p">,</span> <span class="n" style="color: #333;">lits</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">old</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">new</span><span class="p">,</span> <span class="n" style="color: #333;">lits</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC91" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Try nice names p,q,r,s,t before using the (ugly) t_i</span></span>
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<pre style="margin: 0;">+<span id="LC92" class="line" lang="haskell"> <span class="n" style="color: #333;">nameList</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC93" class="line" lang="haskell"> <span class="n" style="color: #333;">nameList</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">text</span> <span class="p">[</span><span class="s" style="color: #d14;">"p"</span><span class="p">,</span><span class="s" style="color: #d14;">"q"</span><span class="p">,</span><span class="s" style="color: #d14;">"r"</span><span class="p">,</span><span class="s" style="color: #d14;">"s"</span><span class="p">,</span><span class="s" style="color: #d14;">"t"</span><span class="p">]</span> <span class="o" style="font-weight: 600;">++</span></span>
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<pre style="margin: 0;">+<span id="LC94" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="p">(</span><span class="sc" style="color: #d14;">'t'</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">show</span> <span class="n" style="color: #333;">u</span><span class="p">)</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">u</span> <span class="o" style="font-weight: 600;"><-</span> <span class="p">[(</span><span class="mi" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="p">)</span><span class="o" style="font-weight: 600;">..</span><span class="p">]</span> <span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC95" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC96" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">PmPprM</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;">State</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PrettyPmRefutEnv</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">NameSet</span><span class="p">)</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC97" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (the first part of the state is read only. make it a reader?)</span></span>
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98
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<pre style="margin: 0;">+<span id="LC98" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC99" class="line" lang="haskell"><span class="n" style="color: #333;">runPmPpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmPprM</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;">PrettyPmRefutEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">,[</span><span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span><span class="p">])])</span></span>
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100
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<pre style="margin: 0;">+<span id="LC100" class="line" lang="haskell"><span class="n" style="color: #333;">runPmPpr</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">lit_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">result</span><span class="p">,</span> <span class="n" style="color: #333;">mapMaybe</span> <span class="n" style="color: #333;">is_used</span> <span class="p">(</span><span class="n" style="color: #333;">udfmToList</span> <span class="n" style="color: #333;">lit_env</span><span class="p">))</span></span>
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101
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<pre style="margin: 0;">+<span id="LC101" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC102" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">result</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">_lit_env</span><span class="p">,</span> <span class="n" style="color: #333;">used</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">runState</span> <span class="n" style="color: #333;">m</span> <span class="p">(</span><span class="n" style="color: #333;">lit_env</span><span class="p">,</span> <span class="n" style="color: #333;">emptyNameSet</span><span class="p">)</span></span>
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103
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<pre style="margin: 0;">+<span id="LC103" class="line" lang="haskell"></span>
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104
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<pre style="margin: 0;">+<span id="LC104" class="line" lang="haskell"> <span class="n" style="color: #333;">is_used</span> <span class="p">(</span><span class="n" style="color: #333;">k</span><span class="p">,</span><span class="n" style="color: #333;">v</span><span class="p">)</span></span>
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105
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<pre style="margin: 0;">+<span id="LC105" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">elemUniqSet_Directly</span> <span class="n" style="color: #333;">k</span> <span class="n" style="color: #333;">used</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">v</span></span>
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106
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<pre style="margin: 0;">+<span id="LC106" 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;">Nothing</span></span>
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107
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<pre style="margin: 0;">+<span id="LC107" class="line" lang="haskell"></span>
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108
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<pre style="margin: 0;">+<span id="LC108" class="line" lang="haskell"><span class="n" style="color: #333;">addUsed</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmPprM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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109
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<pre style="margin: 0;">+<span id="LC109" class="line" lang="haskell"><span class="n" style="color: #333;">addUsed</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">modify</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">(</span><span class="n" style="color: #333;">negated</span><span class="p">,</span> <span class="n" style="color: #333;">used</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">negated</span><span class="p">,</span> <span class="n" style="color: #333;">extendNameSet</span> <span class="n" style="color: #333;">used</span> <span class="n" style="color: #333;">x</span><span class="p">))</span></span>
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110
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<pre style="margin: 0;">+<span id="LC110" class="line" lang="haskell"></span>
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111
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<pre style="margin: 0;">+<span id="LC111" class="line" lang="haskell"><span class="n" style="color: #333;">checkNegation</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmPprM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- the clean name if it is negated</span></span>
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112
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<pre style="margin: 0;">+<span id="LC112" class="line" lang="haskell"><span class="n" style="color: #333;">checkNegation</span> <span class="n" style="color: #333;">x</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="LC113" class="line" lang="haskell"> <span class="n" style="color: #333;">negated</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">gets</span> <span class="n" style="color: #333;">fst</span></span>
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<pre style="margin: 0;">+<span id="LC114" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lookupDNameEnv</span> <span class="n" style="color: #333;">negated</span> <span class="n" style="color: #333;">x</span> <span class="kr" style="font-weight: 600;">of</span></span>
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115
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<pre style="margin: 0;">+<span id="LC115" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">new</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">new</span></span>
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116
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<pre style="margin: 0;">+<span id="LC116" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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117
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<pre style="margin: 0;">+<span id="LC117" class="line" lang="haskell"></span>
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118
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<pre style="margin: 0;">+<span id="LC118" class="line" lang="haskell"><span class="cd">-- | Pretty print a pmexpr, but remember to prettify the names of the variables</span></span>
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119
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<pre style="margin: 0;">+<span id="LC119" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- that refer to neg-literals. The ones that cannot be shown are printed as</span></span>
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120
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<pre style="margin: 0;">+<span id="LC120" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- underscores.</span></span>
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121
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<pre style="margin: 0;">+<span id="LC121" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmPprM</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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122
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<pre style="margin: 0;">+<span id="LC122" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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123
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<pre style="margin: 0;">+<span id="LC123" class="line" lang="haskell"> <span class="n" style="color: #333;">mb_name</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkNegation</span> <span class="n" style="color: #333;">x</span></span>
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124
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<pre style="margin: 0;">+<span id="LC124" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">mb_name</span> <span class="kr" style="font-weight: 600;">of</span></span>
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125
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<pre style="margin: 0;">+<span id="LC125" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addUsed</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">>></span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">name</span></span>
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126
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<pre style="margin: 0;">+<span id="LC126" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">underscore</span></span>
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127
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<pre style="margin: 0;">+<span id="LC127" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">args</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPmExprCon</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">args</span></span>
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128
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<pre style="margin: 0;">+<span id="LC128" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprLit</span> <span class="n" style="color: #333;">l</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">l</span><span class="p">)</span></span>
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129
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<pre style="margin: 0;">+<span id="LC129" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprOther</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">underscore</span> <span class="c1" style="color: #998; font-style: italic;">-- don't show</span></span>
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130
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<pre style="margin: 0;">+<span id="LC130" class="line" lang="haskell"></span>
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131
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<pre style="margin: 0;">+<span id="LC131" class="line" lang="haskell"><span class="n" style="color: #333;">needsParens</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</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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132
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<pre style="margin: 0;">+<span id="LC132" class="line" lang="haskell"><span class="n" style="color: #333;">needsParens</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprVar</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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133
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<pre style="margin: 0;">+<span id="LC133" class="line" lang="haskell"><span class="n" style="color: #333;">needsParens</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprLit</span> <span class="n" style="color: #333;">l</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isNegatedPmLit</span> <span class="n" style="color: #333;">l</span></span>
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134
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<pre style="margin: 0;">+<span id="LC134" class="line" lang="haskell"><span class="n" style="color: #333;">needsParens</span> <span class="p">(</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="kt" style="color: #458; font-weight: 600;">False</span> <span class="c1" style="color: #998; font-style: italic;">-- will become a wildcard</span></span>
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135
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<pre style="margin: 0;">+<span id="LC135" class="line" lang="haskell"><span class="n" style="color: #333;">needsParens</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">c</span><span class="p">)</span> <span class="n" style="color: #333;">es</span><span class="p">)</span></span>
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136
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<pre style="margin: 0;">+<span id="LC136" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTupleDataCon</span> <span class="n" style="color: #333;">c</span></span>
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137
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<pre style="margin: 0;">+<span id="LC137" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">isConsDataCon</span> <span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">es</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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138
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<pre style="margin: 0;">+<span id="LC138" 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;">True</span></span>
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139
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<pre style="margin: 0;">+<span id="LC139" class="line" lang="haskell"><span class="n" style="color: #333;">needsParens</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PatSynCon</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="n" style="color: #333;">es</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">es</span><span class="p">)</span></span>
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140
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<pre style="margin: 0;">+<span id="LC140" class="line" lang="haskell"></span>
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141
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<pre style="margin: 0;">+<span id="LC141" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExprWithParens</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmPprM</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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142
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<pre style="margin: 0;">+<span id="LC142" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExprWithParens</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;">+<span id="LC143" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">needsParens</span> <span class="n" style="color: #333;">expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">parens</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">pprPmExpr</span> <span class="n" style="color: #333;">expr</span></span>
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144
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<pre style="margin: 0;">+<span id="LC144" 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;">pprPmExpr</span> <span class="n" style="color: #333;">expr</span></span>
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145
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<pre style="margin: 0;">+<span id="LC145" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC146" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExprCon</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;">PmExpr</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmPprM</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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147
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<pre style="margin: 0;">+<span id="LC147" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExprCon</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">con</span><span class="p">)</span> <span class="n" style="color: #333;">args</span></span>
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148
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<pre style="margin: 0;">+<span id="LC148" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTupleDataCon</span> <span class="n" style="color: #333;">con</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTuple</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">pprPmExpr</span> <span class="n" style="color: #333;">args</span></span>
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149
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<pre style="margin: 0;">+<span id="LC149" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isConsDataCon</span> <span class="n" style="color: #333;">con</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pretty_list</span></span>
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<pre style="margin: 0;">+<span id="LC150" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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151
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<pre style="margin: 0;">+<span id="LC151" class="line" lang="haskell"> <span class="n" style="color: #333;">mkTuple</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<pre style="margin: 0;">+<span id="LC152" class="line" lang="haskell"> <span class="n" style="color: #333;">mkTuple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">parens</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">fsep</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">punctuate</span> <span class="n" style="color: #333;">comma</span></span>
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<pre style="margin: 0;">+<span id="LC153" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC154" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- lazily, to be used in the list case only</span></span>
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<pre style="margin: 0;">+<span id="LC155" class="line" lang="haskell"> <span class="n" style="color: #333;">pretty_list</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmPprM</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<pre style="margin: 0;">+<span id="LC156" class="line" lang="haskell"> <span class="n" style="color: #333;">pretty_list</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">isNilPmExpr</span> <span class="p">(</span><span class="n" style="color: #333;">last</span> <span class="n" style="color: #333;">list</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="LC157" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">brackets</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">fsep</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">punctuate</span> <span class="n" style="color: #333;">comma</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">pprPmExpr</span> <span class="p">(</span><span class="n" style="color: #333;">init</span> <span class="n" style="color: #333;">list</span><span class="p">)</span></span>
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158
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<pre style="margin: 0;">+<span id="LC158" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">parens</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">hcat</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">punctuate</span> <span class="n" style="color: #333;">colon</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">pprPmExpr</span> <span class="n" style="color: #333;">list</span></span>
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159
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<pre style="margin: 0;">+<span id="LC159" class="line" lang="haskell"></span>
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160
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<pre style="margin: 0;">+<span id="LC160" class="line" lang="haskell"> <span class="n" style="color: #333;">list</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">list_elements</span> <span class="n" style="color: #333;">args</span></span>
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161
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<pre style="margin: 0;">+<span id="LC161" class="line" lang="haskell"></span>
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162
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<pre style="margin: 0;">+<span id="LC162" class="line" lang="haskell"> <span class="n" style="color: #333;">list_elements</span> <span class="p">[</span><span class="n" style="color: #333;">x</span><span class="p">,</span><span class="n" style="color: #333;">y</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC163" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c</span> <span class="n" style="color: #333;">es</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">y</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">nilDataCon</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">c</span></span>
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164
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<pre style="margin: 0;">+<span id="LC164" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span><span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">es</span><span class="p">)</span> <span class="p">[</span><span class="n" style="color: #333;">x</span><span class="p">,</span><span class="n" style="color: #333;">y</span><span class="p">]</span></span>
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165
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<pre style="margin: 0;">+<span id="LC165" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c</span> <span class="n" style="color: #333;">es</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">y</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">consDataCon</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">c</span></span>
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166
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<pre style="margin: 0;">+<span id="LC166" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">list_elements</span> <span class="n" style="color: #333;">es</span></span>
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167
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<pre style="margin: 0;">+<span id="LC167" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="n" style="color: #333;">x</span><span class="p">,</span><span class="n" style="color: #333;">y</span><span class="p">]</span></span>
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168
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<pre style="margin: 0;">+<span id="LC168" class="line" lang="haskell"> <span class="n" style="color: #333;">list_elements</span> <span class="n" style="color: #333;">list</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"list_elements:"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">list</span><span class="p">)</span></span>
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169
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<pre style="margin: 0;">+<span id="LC169" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmExprCon</span> <span class="n" style="color: #333;">cl</span> <span class="n" style="color: #333;">args</span></span>
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170
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<pre style="margin: 0;">+<span id="LC170" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">conLikeIsInfix</span> <span class="n" style="color: #333;">cl</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">args</span> <span class="kr" style="font-weight: 600;">of</span></span>
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171
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<pre style="margin: 0;">+<span id="LC171" class="line" lang="haskell"> <span class="p">[</span><span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="n" style="color: #333;">y</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="n" style="color: #333;">x'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pprPmExprWithParens</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">+<span id="LC172" class="line" lang="haskell"> <span class="n" style="color: #333;">y'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pprPmExprWithParens</span> <span class="n" style="color: #333;">y</span></span>
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173
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<pre style="margin: 0;">+<span id="LC173" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">x'</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cl</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">y'</span><span class="p">)</span></span>
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174
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<pre style="margin: 0;">+<span id="LC174" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- can it be infix but have more than two arguments?</span></span>
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175
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<pre style="margin: 0;">+<span id="LC175" class="line" lang="haskell"> <span class="n" style="color: #333;">list</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"pprPmExprCon:"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">list</span><span class="p">)</span></span>
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176
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<pre style="margin: 0;">+<span id="LC176" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cl</span><span class="p">)</span></span>
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177
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<pre style="margin: 0;">+<span id="LC177" 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 class="n" style="color: #333;">args'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">pprPmExprWithParens</span> <span class="n" style="color: #333;">args</span></span>
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178
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<pre style="margin: 0;">+<span id="LC178" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">fsep</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cl</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">args'</span><span class="p">))</span></span>
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179
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<pre style="margin: 0;">+<span id="LC179" class="line" lang="haskell"></span>
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180
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<pre style="margin: 0;">+<span id="LC180" class="line" lang="haskell"><span class="cd">-- | Check whether a literal is negated</span></span>
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181
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<pre style="margin: 0;">+<span id="LC181" class="line" lang="haskell"><span class="n" style="color: #333;">isNegatedPmLit</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;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC182" class="line" lang="haskell"><span class="n" style="color: #333;">isNegatedPmLit</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmOLit</span> <span class="n" style="color: #333;">b</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">b</span></span>
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183
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<pre style="margin: 0;">+<span id="LC183" class="line" lang="haskell"><span class="n" style="color: #333;">isNegatedPmLit</span> <span class="n" style="color: #333;">_other_lit</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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184
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<pre style="margin: 0;">+<span id="LC184" class="line" lang="haskell"></span>
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185
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<pre style="margin: 0;">+<span id="LC185" class="line" lang="haskell"><span class="cd">-- | Check whether a PmExpr is syntactically e</span></span>
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186
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<pre style="margin: 0;">+<span id="LC186" class="line" lang="haskell"><span class="n" style="color: #333;">isNilPmExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</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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187
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<pre style="margin: 0;">+<span id="LC187" class="line" lang="haskell"><span class="n" style="color: #333;">isNilPmExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">nilDataCon</span></span>
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188
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<pre style="margin: 0;">+<span id="LC188" class="line" lang="haskell"><span class="n" style="color: #333;">isNilPmExpr</span> <span class="n" style="color: #333;">_other_expr</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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189
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<pre style="margin: 0;">+<span id="LC189" class="line" lang="haskell"></span>
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190
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<pre style="margin: 0;">+<span id="LC190" class="line" lang="haskell"><span class="cd">-- | Check if a DataCon is (:).</span></span>
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191
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<pre style="margin: 0;">+<span id="LC191" class="line" lang="haskell"><span class="n" style="color: #333;">isConsDataCon</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DataCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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192
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<pre style="margin: 0;">+<span id="LC192" class="line" lang="haskell"><span class="n" style="color: #333;">isConsDataCon</span> <span class="n" style="color: #333;">con</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">consDataCon</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">con</span></span></pre>
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<li id="379674a5063221cec43f0f659c2eb67b30339f45">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/08c42ce3b5f425654e8ae49ca1c54c1471017d43#379674a5063221cec43f0f659c2eb67b30339f45"><strong>compiler/deSugar/TmOracle.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">@@ -9,12 +9,12 @@ The term equality oracle. The main export of the module is function `tmOracle'.</td>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">TmOracle</span> <span class="p">(</span></span>
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10
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- re-exported from PmExpr</span></span>
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12
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<pre style="margin: 0;">-<span id="LC12" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">PmLit</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">SimpleEq</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ComplexEq</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmVarEnv</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">falsePmExpr</span><span class="p">,</span></span>
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13
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<pre style="margin: 0;">-<span id="LC13" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">eqPmLit</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">filterComplex</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isNotPmExprOther</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">runPmPprM</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lhsExprToPmExpr</span><span class="p">,</span></span>
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14
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<pre style="margin: 0;">-<span id="LC14" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">hsExprToPmExpr</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pprPmExprWithParens</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">PmLit</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">SimpleEq</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ComplexEq</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmVarEnv</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmRefutEnv</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">eqPmLit</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isNotPmExprOther</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lhsExprToPmExpr</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">hsExprToPmExpr</span><span class="p">,</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="c1" style="color: #998; font-style: italic;">-- the term oracle</span></span>
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<pre style="margin: 0;">-<span id="LC17" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tmOracle</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">initialTmState</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">solveOneEq</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">extendSubst</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">canDiverge</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tmOracle</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">initialTmState</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">wrapUpTmState</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">solveOneEq</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">extendSubst</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">canDiverge</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">addSolveRefutableAltCon</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lookupRefutableAltCons</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- misc.</span></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">toComplex</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">exprDeepLookup</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pmLitType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">flattenPmVarEnv</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">@@ -32,7 +32,9 @@ import Type</td>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">HsLit</span></span>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">TcHsSyn</span></span>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">MonadUtils</span></span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">ListSetOps</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">insertNoDup</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">unionLists</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Util</span></span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Maybes</span></span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Outputable</span></span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">NameEnv</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -48,23 +50,77 @@ import NameEnv</td>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"><span class="cd">-- | The type of substitutions.</span></span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">PmVarEnv</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NameEnv</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span></span>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC51" class="line" lang="haskell"><span class="cd">-- | The environment of the oracle contains</span></span>
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<pre style="margin: 0;">-<span id="LC52" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 1. A Bool (are there any constraints we cannot handle? (PmExprOther)).</span></span>
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<pre style="margin: 0;">-<span id="LC53" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 2. A substitution we extend with every step and return as a result.</span></span>
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<pre style="margin: 0;">-<span id="LC54" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">TmOracleEnv</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmVarEnv</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC53" class="line" lang="haskell"><span class="cd">-- | An environment assigning shapes to variables that immediately lead to a</span></span>
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<pre style="margin: 0;">+<span id="LC54" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- refutation. So, if this maps @x :-> [Just]@, then trying to solve a</span></span>
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<pre style="margin: 0;">+<span id="LC55" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'ComplexEq' like @x ~ Just False@ immediately leads to a contradiction.</span></span>
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<pre style="margin: 0;">+<span id="LC56" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Determinism is important since we use this for warning messages in</span></span>
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<pre style="margin: 0;">+<span id="LC57" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'PmPpr.pprUncovered'. We don't do the same for 'PmVarEnv', so that is a plain</span></span>
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<pre style="margin: 0;">+<span id="LC58" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'NameEnv'.</span></span>
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<pre style="margin: 0;">+<span id="LC59" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC60" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See also Note [Refutable shapes] in TmOracle.</span></span>
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<pre style="margin: 0;">+<span id="LC61" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">PmRefutEnv</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">DNameEnv</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC62" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC63" class="line" lang="haskell"><span class="cd">-- | The state of the term oracle. Tracks all term-level facts we know,</span></span>
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<pre style="margin: 0;">+<span id="LC64" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- giving special treatment to constraints of the form "x is @True@" ('tm_pos')</span></span>
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<pre style="margin: 0;">+<span id="LC65" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- and "x is not @5@" ('tm_neg').</span></span>
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<pre style="margin: 0;">+<span id="LC66" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmS</span></span>
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<pre style="margin: 0;">+<span id="LC67" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">tm_facts</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">ComplexEq</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC68" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Complex equalities we may assume to hold. We have not (yet) brought them</span></span>
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<pre style="margin: 0;">+<span id="LC69" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- into a form leading to a contradiction or a 'SimpleEq'. Otherwise, we would</span></span>
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<pre style="margin: 0;">+<span id="LC70" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- store the 'SimpleEq' as a solution in the 'tm_pos' env, where it could be</span></span>
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<pre style="margin: 0;">+<span id="LC71" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- used to simplify other equations. All 'ComplexEq's are fully substituted</span></span>
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<pre style="margin: 0;">+<span id="LC72" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- according to (i.e., fixed-points under) 'tm_pos'.</span></span>
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<pre style="margin: 0;">+<span id="LC73" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tm_pos</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">PmVarEnv</span></span>
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<pre style="margin: 0;">+<span id="LC74" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ A substitution with solutions we extend with every step and return as a</span></span>
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<pre style="margin: 0;">+<span id="LC75" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- result. Think of it as any 'ComplexEq' from 'tm_facts' we managed to</span></span>
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<pre style="margin: 0;">+<span id="LC76" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- bring into the form of a 'SimpleEq'.</span></span>
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<pre style="margin: 0;">+<span id="LC77" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Contrary to 'tm_facts', the substitution is in /triangular form/: It might</span></span>
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<pre style="margin: 0;">+<span id="LC78" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- map @x@ to @y@ where @y@ itself occurs in the domain of 'tm_pos', rendering</span></span>
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<pre style="margin: 0;">+<span id="LC79" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- lookup non-idempotent. This means that 'varDeepLookup' potentially has to</span></span>
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<pre style="margin: 0;">+<span id="LC80" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- walk along a chain of var-to-var mappings until we find the solution but</span></span>
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<pre style="margin: 0;">+<span id="LC81" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- has the advantage that when we update the solution for @y@ above, we</span></span>
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<pre style="margin: 0;">+<span id="LC82" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- automatically update the solution for @x@ in a union-find-like fashion.</span></span>
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<pre style="margin: 0;">+<span id="LC83" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tm_neg</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">PmRefutEnv</span></span>
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<pre style="margin: 0;">+<span id="LC84" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ maps each variable @x@ to a list of 'PmAltCon's that @x@ definitely</span></span>
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<pre style="margin: 0;">+<span id="LC85" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- cannot match. Example, assuming</span></span>
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<pre style="margin: 0;">+<span id="LC86" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC87" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- @</span></span>
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<pre style="margin: 0;">+<span id="LC88" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- data T = Leaf Int | Branch T T | Node Int T</span></span>
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<pre style="margin: 0;">+<span id="LC89" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- @</span></span>
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<pre style="margin: 0;">+<span id="LC90" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC91" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- then @x :-> [Leaf, Node]@ means that @x@ cannot match a @Leaf@ or @Node@,</span></span>
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<pre style="margin: 0;">+<span id="LC92" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- and hence can only match @Branch@. Should we later solve @x@ to a variable</span></span>
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<pre style="margin: 0;">+<span id="LC93" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- @y@, we merge the refutable shapes of @x@ into those of @y@.</span></span>
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<pre style="margin: 0;">+<span id="LC94" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC95" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC96" class="line" lang="haskell"><span class="cd">-- | Initial state of the oracle.</span></span>
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<pre style="margin: 0;">+<span id="LC97" class="line" lang="haskell"><span class="n" style="color: #333;">initialTmState</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span></span>
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<pre style="margin: 0;">+<span id="LC98" class="line" lang="haskell"><span class="n" style="color: #333;">initialTmState</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmS</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">emptyNameEnv</span> <span class="n" style="color: #333;">emptyDNameEnv</span></span>
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99
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<pre style="margin: 0;">+<span id="LC99" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC100" class="line" lang="haskell"><span class="cd">-- | Wrap up the term oracle's state once solving is complete. Drop any</span></span>
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101
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<pre style="margin: 0;">+<span id="LC101" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- information about non-simple constraints and flatten (height 1) the</span></span>
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102
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<pre style="margin: 0;">+<span id="LC102" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- substitution.</span></span>
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<pre style="margin: 0;">+<span id="LC103" class="line" lang="haskell"><span class="n" style="color: #333;">wrapUpTmState</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmVarEnv</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmRefutEnv</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC104" class="line" lang="haskell"><span class="n" style="color: #333;">wrapUpTmState</span> <span class="n" style="color: #333;">solver_state</span></span>
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105
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<pre style="margin: 0;">+<span id="LC105" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">flattenPmVarEnv</span> <span class="p">(</span><span class="n" style="color: #333;">tm_pos</span> <span class="n" style="color: #333;">solver_state</span><span class="p">),</span> <span class="n" style="color: #333;">tm_neg</span> <span class="n" style="color: #333;">solver_state</span><span class="p">)</span></span>
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106
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<pre style="margin: 0;">+<span id="LC106" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC107" class="line" lang="haskell"><span class="cd">-- | Flatten the triangular subsitution.</span></span>
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<pre style="margin: 0;">+<span id="LC108" class="line" lang="haskell"><span class="n" style="color: #333;">flattenPmVarEnv</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmVarEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmVarEnv</span></span>
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<pre style="margin: 0;">+<span id="LC109" class="line" lang="haskell"><span class="n" style="color: #333;">flattenPmVarEnv</span> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapNameEnv</span> <span class="p">(</span><span class="n" style="color: #333;">exprDeepLookup</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">env</span></span>
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110
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<pre style="margin: 0;"> <span id="LC110" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC111" class="line" lang="haskell"><span class="cd">-- | Check whether a constraint (x ~ BOT) can succeed,</span></span>
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57
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112
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<pre style="margin: 0;"> <span id="LC112" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- given the resulting state of the term oracle.</span></span>
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58
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<pre style="margin: 0;"> <span id="LC113" class="line" lang="haskell"><span class="n" style="color: #333;">canDiverge</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TmState</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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59
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<pre style="margin: 0;">-<span id="LC59" class="line" lang="haskell"><span class="n" style="color: #333;">canDiverge</span> <span class="n" style="color: #333;">x</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">standby</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">_unhandled</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">env</span></span><span class="p"><span class="idiff right">))</span></span></span>
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114
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<pre style="margin: 0;">+<span id="LC114" class="line" lang="haskell"><span class="n" style="color: #333;">canDiverge</span> <span class="n" style="color: #333;">x</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">TmS</span></span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tm_pos</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">pos</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tm_facts</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">facts</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">}</span></span></span>
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60
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<pre style="margin: 0;"> <span id="LC115" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If the variable seems not evaluated, there is a possibility for</span></span>
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<pre style="margin: 0;">-<span id="LC61" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- constraint x ~ BOT to be satisfiable.</span></span>
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<pre style="margin: 0;">-<span id="LC62" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">varDeepLookup</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">x</span> <span class="c1" style="color: #998; font-style: italic;">-- seems not forced</span></span>
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<pre style="margin: 0;">+<span id="LC116" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- constraint x ~ BOT to be satisfiable. That's the case when we haven't found</span></span>
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<pre style="margin: 0;">+<span id="LC117" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- a solution (i.e. some equivalent literal or constructor) for it yet.</span></span>
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<pre style="margin: 0;">+<span id="LC118" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">y</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">varDeepLookup</span> <span class="n" style="color: #333;">pos</span> <span class="n" style="color: #333;">x</span> <span class="c1" style="color: #998; font-style: italic;">-- seems not forced</span></span>
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<pre style="margin: 0;"> <span id="LC119" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If it is involved (directly or indirectly) in any equality in the</span></span>
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<pre style="margin: 0;"> <span id="LC120" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- worklist, we can assume that it is already indirectly evaluated,</span></span>
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<pre style="margin: 0;"> <span id="LC121" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- as a side-effect of equality checking. If not, then we can assume</span></span>
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<pre style="margin: 0;"> <span id="LC122" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- that the constraint is satisfiable.</span></span>
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<pre style="margin: 0;">-<span id="LC67" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">not</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">any</span> <span class="p">(</span><span class="n" style="color: #333;">isForcedByEq</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="n" style="color: #333;"><span class="idiff left">standby</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">||</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">any</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">isForcedByEq</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">y</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">standby</span></span></span>
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<pre style="margin: 0;">+<span id="LC123" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">not</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">any</span> <span class="p">(</span><span class="n" style="color: #333;">isForcedByEq</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="n" style="color: #333;"><span class="idiff left">facts</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">any</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">isForcedByEq</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">y</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">facts</span></span></span>
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<pre style="margin: 0;"> <span id="LC124" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Variable x is already in WHNF so the constraint is non-satisfiable</span></span>
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<pre style="margin: 0;"> <span id="LC125" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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126
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<pre style="margin: 0;"> <span id="LC126" 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">@@ -78,27 +134,54 @@ varIn x e = case e of</td>
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<pre style="margin: 0;"> <span id="LC134" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">y</span></span>
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79
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<pre style="margin: 0;"> <span id="LC135" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">es</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;">x</span> <span class="p">`</span><span class="n" style="color: #333;">varIn</span><span class="p">`)</span> <span class="n" style="color: #333;">es</span></span>
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80
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<pre style="margin: 0;"> <span id="LC136" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmExprLit</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="LC81" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmExprEq</span> <span class="n" style="color: #333;">e1</span> <span class="n" style="color: #333;">e2</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">x</span> <span class="p">`</span><span class="n" style="color: #333;">varIn</span><span class="p">`</span> <span class="n" style="color: #333;">e1</span><span class="p">)</span> <span class="o" style="font-weight: 600;">||</span> <span class="p">(</span><span class="n" style="color: #333;">x</span> <span class="p">`</span><span class="n" style="color: #333;">varIn</span><span class="p">`</span> <span class="n" style="color: #333;">e2</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC137" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmExprOther</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="LC138" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC84" class="line" lang="haskell"><span class="cd">-- | Flatten the DAG (Could be improved in terms of performance.).</span></span>
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<pre style="margin: 0;">-<span id="LC85" class="line" lang="haskell"><span class="n" style="color: #333;">flattenPmVarEnv</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmVarEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmVarEnv</span></span>
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<pre style="margin: 0;">-<span id="LC86" class="line" lang="haskell"><span class="n" style="color: #333;">flattenPmVarEnv</span> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapNameEnv</span> <span class="p">(</span><span class="n" style="color: #333;">exprDeepLookup</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">env</span></span>
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<pre style="margin: 0;">-<span id="LC87" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC88" class="line" lang="haskell"><span class="cd">-- | The state of the term oracle (includes complex constraints that cannot</span></span>
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<pre style="margin: 0;">-<span id="LC89" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- progress unless we get more information).</span></span>
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<pre style="margin: 0;">-<span id="LC90" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">ComplexEq</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">TmOracleEnv</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC91" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC92" class="line" lang="haskell"><span class="cd">-- | Initial state of the oracle.</span></span>
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<pre style="margin: 0;">-<span id="LC93" class="line" lang="haskell"><span class="n" style="color: #333;">initialTmState</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span></span>
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<pre style="margin: 0;">-<span id="LC94" class="line" lang="haskell"><span class="n" style="color: #333;">initialTmState</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">,</span> <span class="n" style="color: #333;">emptyNameEnv</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC139" class="line" lang="haskell"><span class="cd">-- | Check whether the equality @x ~ e@ leads to a refutation. Make sure that</span></span>
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<pre style="margin: 0;">+<span id="LC140" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @x@ and @e@ are completely substituted before!</span></span>
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<pre style="margin: 0;">+<span id="LC141" class="line" lang="haskell"><span class="n" style="color: #333;">isRefutable</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmRefutEnv</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="LC142" class="line" lang="haskell"><span class="n" style="color: #333;">isRefutable</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">env</span></span>
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<pre style="margin: 0;">+<span id="LC143" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fromMaybe</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">elem</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">exprToAlt</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;"><*></span> <span class="n" style="color: #333;">lookupDNameEnv</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;"> <span id="LC144" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC145" class="line" lang="haskell"><span class="cd">-- | Solve a complex equality (top-level).</span></span>
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<pre style="margin: 0;"> <span id="LC146" class="line" lang="haskell"><span class="n" style="color: #333;">solveOneEq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ComplexEq</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span></span>
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<pre style="margin: 0;">-<span id="LC98" class="line" lang="haskell"><span class="n" style="color: #333;">solveOneEq</span> <span class="n" style="color: #333;">solver_env</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span><span class="n" style="color: #333;">env</span><span class="p">))</span> <span class="n" style="color: #333;">complex</span></span>
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<pre style="margin: 0;">-<span id="LC99" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">solveComplexEq</span> <span class="n" style="color: #333;">solver_env</span> <span class="c1" style="color: #998; font-style: italic;">-- do the actual *merging* with existing state</span></span>
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<pre style="margin: 0;">-<span id="LC100" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">simplifyComplexEq</span> <span class="c1" style="color: #998; font-style: italic;">-- simplify as much as you can</span></span>
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101
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<pre style="margin: 0;">-<span id="LC101" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">applySubstComplexEq</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">complex</span> <span class="c1" style="color: #998; font-style: italic;">-- replace everything we already know</span></span>
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<pre style="margin: 0;">+<span id="LC147" class="line" lang="haskell"><span class="n" style="color: #333;">solveOneEq</span> <span class="n" style="color: #333;">solver_env</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">TmS</span><span class="p">{</span> <span class="n" style="color: #333;">tm_pos</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pos</span> <span class="p">}</span> <span class="n" style="color: #333;">complex</span></span>
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148
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<pre style="margin: 0;">+<span id="LC148" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">solveComplexEq</span> <span class="n" style="color: #333;">solver_env</span> <span class="c1" style="color: #998; font-style: italic;">-- do the actual *merging* with existing state</span></span>
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149
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<pre style="margin: 0;">+<span id="LC149" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">applySubstComplexEq</span> <span class="n" style="color: #333;">pos</span> <span class="n" style="color: #333;">complex</span> <span class="c1" style="color: #998; font-style: italic;">-- replace everything we already know</span></span>
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150
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<pre style="margin: 0;">+<span id="LC150" class="line" lang="haskell"></span>
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151
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<pre style="margin: 0;">+<span id="LC151" class="line" lang="haskell"><span class="n" style="color: #333;">exprToAlt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span></span>
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<pre style="margin: 0;">+<span id="LC152" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note how this deliberately chooses bogus argument types for PmAltConLike.</span></span>
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153
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<pre style="margin: 0;">+<span id="LC153" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This is only safe for doing lookup in a 'PmRefutEnv'!</span></span>
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154
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<pre style="margin: 0;">+<span id="LC154" class="line" lang="haskell"><span class="n" style="color: #333;">exprToAlt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">cl</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;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltConLike</span> <span class="n" style="color: #333;">cl</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span></span>
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155
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<pre style="margin: 0;">+<span id="LC155" class="line" lang="haskell"><span class="n" style="color: #333;">exprToAlt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprLit</span> <span class="n" style="color: #333;">l</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltLit</span> <span class="n" style="color: #333;">l</span><span class="p">)</span></span>
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156
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<pre style="margin: 0;">+<span id="LC156" class="line" lang="haskell"><span class="n" style="color: #333;">exprToAlt</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;">Nothing</span></span>
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157
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<pre style="margin: 0;">+<span id="LC157" class="line" lang="haskell"></span>
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158
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<pre style="margin: 0;">+<span id="LC158" class="line" lang="haskell"><span class="cd">-- | Record that a particular 'Id' can't take the shape of a 'PmAltCon' in the</span></span>
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159
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<pre style="margin: 0;">+<span id="LC159" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'TmState' and return @Nothing@ if that leads to a contradiction.</span></span>
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160
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<pre style="margin: 0;">+<span id="LC160" class="line" lang="haskell"><span class="n" style="color: #333;">addSolveRefutableAltCon</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</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;">PmAltCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span></span>
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161
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<pre style="margin: 0;">+<span id="LC161" class="line" lang="haskell"><span class="n" style="color: #333;">addSolveRefutableAltCon</span> <span class="n" style="color: #333;">original</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">TmS</span><span class="p">{</span> <span class="n" style="color: #333;">tm_pos</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pos</span><span class="p">,</span> <span class="n" style="color: #333;">tm_neg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">neg</span> <span class="p">}</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">nalt</span></span>
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162
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<pre style="margin: 0;">+<span id="LC162" 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;">exprToAlt</span> <span class="n" style="color: #333;">e</span> <span class="kr" style="font-weight: 600;">of</span></span>
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163
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<pre style="margin: 0;">+<span id="LC163" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">extended</span> <span class="c1" style="color: #998; font-style: italic;">-- Not solved yet</span></span>
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164
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<pre style="margin: 0;">+<span id="LC164" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">alt</span> <span class="c1" style="color: #998; font-style: italic;">-- We have a solution</span></span>
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165
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<pre style="margin: 0;">+<span id="LC165" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">alt</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">nalt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="c1" style="color: #998; font-style: italic;">-- ... which is contradictory</span></span>
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166
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<pre style="margin: 0;">+<span id="LC166" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">original</span> <span class="c1" style="color: #998; font-style: italic;">-- ... which is compatible, rendering the</span></span>
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167
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<pre style="margin: 0;">+<span id="LC167" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="c1" style="color: #998; font-style: italic;">-- refutation redundant</span></span>
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168
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<pre style="margin: 0;">+<span id="LC168" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">y</span><span class="p">,</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">varDeepLookup</span> <span class="n" style="color: #333;">pos</span> <span class="p">(</span><span class="n" style="color: #333;">idName</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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169
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<pre style="margin: 0;">+<span id="LC169" class="line" lang="haskell"> <span class="n" style="color: #333;">extended</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">original</span> <span class="p">{</span> <span class="n" style="color: #333;">tm_neg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">neg'</span> <span class="p">}</span></span>
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170
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<pre style="margin: 0;">+<span id="LC170" class="line" lang="haskell"> <span class="n" style="color: #333;">neg'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">alterDNameEnv</span> <span class="p">(</span><span class="n" style="color: #333;">delNulls</span> <span class="p">(</span><span class="n" style="color: #333;">insertNoDup</span> <span class="n" style="color: #333;">nalt</span><span class="p">))</span> <span class="n" style="color: #333;">neg</span> <span class="n" style="color: #333;">y</span></span>
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171
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<pre style="margin: 0;">+<span id="LC171" class="line" lang="haskell"></span>
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172
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<pre style="margin: 0;">+<span id="LC172" class="line" lang="haskell"><span class="cd">-- | When updating 'tm_neg', we want to delete any 'null' entries. This adapter</span></span>
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173
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<pre style="margin: 0;">+<span id="LC173" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- intends to provide a suitable interface for 'alterDNameEnv'.</span></span>
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174
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<pre style="margin: 0;">+<span id="LC174" class="line" lang="haskell"><span class="n" style="color: #333;">delNulls</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">([</span><span class="n" style="color: #333;">a</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">])</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span></span>
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175
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<pre style="margin: 0;">+<span id="LC175" class="line" lang="haskell"><span class="n" style="color: #333;">delNulls</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">mb_entry</span></span>
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176
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<pre style="margin: 0;">+<span id="LC176" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">ret</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="o" style="font-weight: 600;">:</span><span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="n" style="color: #333;">fromMaybe</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">mb_entry</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">ret</span></span>
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177
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<pre style="margin: 0;">+<span id="LC177" 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;">Nothing</span></span>
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178
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<pre style="margin: 0;">+<span id="LC178" class="line" lang="haskell"></span>
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179
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<pre style="margin: 0;">+<span id="LC179" class="line" lang="haskell"></span>
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180
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<pre style="margin: 0;">+<span id="LC180" class="line" lang="haskell"><span class="cd">-- | Return all 'PmAltCon' shapes that are impossible for 'Id' to take, i.e.</span></span>
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181
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<pre style="margin: 0;">+<span id="LC181" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- would immediately lead to a refutation by the term oracle.</span></span>
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182
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<pre style="margin: 0;">+<span id="LC182" class="line" lang="haskell"><span class="n" style="color: #333;">lookupRefutableAltCons</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;">TmState</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span><span class="p">]</span></span>
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183
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<pre style="margin: 0;">+<span id="LC183" class="line" lang="haskell"><span class="n" style="color: #333;">lookupRefutableAltCons</span> <span class="n" style="color: #333;">x</span> <span class="kt" style="color: #458; font-weight: 600;">TmS</span> <span class="p">{</span> <span class="n" style="color: #333;">tm_neg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">neg</span> <span class="p">}</span></span>
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184
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<pre style="margin: 0;">+<span id="LC184" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fromMaybe</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="p">(</span><span class="n" style="color: #333;">lookupDNameEnv</span> <span class="n" style="color: #333;">neg</span> <span class="p">(</span><span class="n" style="color: #333;">idName</span> <span class="n" style="color: #333;">x</span><span class="p">))</span></span>
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185
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<pre style="margin: 0;"> <span id="LC185" class="line" lang="haskell"></span>
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103
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<pre style="margin: 0;"> <span id="LC186" class="line" lang="haskell"><span class="cd">-- | Solve a complex equality.</span></span>
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187
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<pre style="margin: 0;"> <span id="LC187" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Nothing => definitely unsatisfiable</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -106,10 +189,10 @@ solveOneEq solver_env@(_,(_,env)) complex</td>
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106
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189
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<pre style="margin: 0;"> <span id="LC189" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- it to the tmstate; the result may or may not be</span></span>
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107
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190
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<pre style="margin: 0;"> <span id="LC190" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- satisfiable</span></span>
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108
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191
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<pre style="margin: 0;"> <span id="LC191" class="line" lang="haskell"><span class="n" style="color: #333;">solveComplexEq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ComplexEq</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span></span>
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109
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<pre style="margin: 0;">-<span id="LC109" class="line" lang="haskell"><span class="n" style="color: #333;">solveComplexEq</span> <span class="n" style="color: #333;">solver_state</span><span class="o" style="font-weight: 600;"><span class="idiff left">@</span></span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">standby</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">unhandled</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">env</span></span><span class="p"><span class="idiff right">))</span></span> <span class="n" style="color: #333;">eq</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="n" style="color: #333;">e1</span><span class="p">,</span> <span class="n" style="color: #333;">e2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">eq</span> <span class="kr" style="font-weight: 600;">of</span></span>
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192
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<pre style="margin: 0;">+<span id="LC192" class="line" lang="haskell"><span class="n" style="color: #333;">solveComplexEq</span> <span class="n" style="color: #333;">solver_state</span> <span class="n" style="color: #333;">eq</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="n" style="color: #333;">e1</span><span class="p">,</span> <span class="n" style="color: #333;">e2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">eq</span> <span class="kr" style="font-weight: 600;">of</span></span>
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110
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193
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<pre style="margin: 0;"> <span id="LC193" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We cannot do a thing about these cases</span></span>
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111
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<pre style="margin: 0;">-<span id="LC111" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprOther</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span><span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">standby</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">True</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">env</span></span><span class="p"><span class="idiff right">))</span></span></span>
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112
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<pre style="margin: 0;">-<span id="LC112" class="line" lang="haskell"> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">PmExprOther</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;">Just</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">standby</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">True</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">env</span></span><span class="p"><span class="idiff right">))</span></span></span>
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194
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<pre style="margin: 0;">+<span id="LC194" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprOther</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span><span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;"><span class="idiff left right">solver_state</span></span></span>
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<td class="diff-line-num new new_line" data-linenumber="195" 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">
195
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<pre style="margin: 0;">+<span id="LC195" class="line" lang="haskell"> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">PmExprOther</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;">Just</span> <span class="n" style="color: #333;"><span class="idiff left right">solver_state</span></span></span>
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113
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196
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<pre style="margin: 0;"> <span id="LC196" class="line" lang="haskell"></span>
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114
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197
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<pre style="margin: 0;"> <span id="LC197" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprLit</span> <span class="n" style="color: #333;">l1</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprLit</span> <span class="n" style="color: #333;">l2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">eqPmLit</span> <span class="n" style="color: #333;">l1</span> <span class="n" style="color: #333;">l2</span> <span class="kr" style="font-weight: 600;">of</span></span>
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115
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198
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<pre style="margin: 0;"> <span id="LC198" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Undecidable Equality for Overloaded Literals]</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="119" 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="202" 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">@@ -119,12 +202,6 @@ solveComplexEq solver_state@(standby, (unhandled, env)) eq@(e1, e2) = case eq of</td>
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119
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202
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<pre style="margin: 0;"> <span id="LC202" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c1</span> <span class="n" style="color: #333;">ts1</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c2</span> <span class="n" style="color: #333;">ts2</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC203" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">c1</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">c2</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">foldlM</span> <span class="n" style="color: #333;">solveComplexEq</span> <span class="n" style="color: #333;">solver_state</span> <span class="p">(</span><span class="n" style="color: #333;">zip</span> <span class="n" style="color: #333;">ts1</span> <span class="n" style="color: #333;">ts2</span><span class="p">)</span></span>
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204
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<pre style="margin: 0;"> <span id="LC204" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<pre style="margin: 0;">-<span id="LC122" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprEq</span> <span class="n" style="color: #333;">t1</span> <span class="n" style="color: #333;">t2</span><span class="p">)</span></span>
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123
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<pre style="margin: 0;">-<span id="LC123" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTruePmExpr</span> <span class="n" style="color: #333;">e1</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">solveComplexEq</span> <span class="n" style="color: #333;">solver_state</span> <span class="p">(</span><span class="n" style="color: #333;">t1</span><span class="p">,</span> <span class="n" style="color: #333;">t2</span><span class="p">)</span></span>
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124
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<pre style="margin: 0;">-<span id="LC124" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isFalsePmExpr</span> <span class="n" style="color: #333;">e1</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">eq</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">standby</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">unhandled</span><span class="p">,</span> <span class="n" style="color: #333;">env</span><span class="p">))</span></span>
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125
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<pre style="margin: 0;">-<span id="LC125" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprEq</span> <span class="n" style="color: #333;">t1</span> <span class="n" style="color: #333;">t2</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span></span>
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126
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<pre style="margin: 0;">-<span id="LC126" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTruePmExpr</span> <span class="n" style="color: #333;">e2</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">solveComplexEq</span> <span class="n" style="color: #333;">solver_state</span> <span class="p">(</span><span class="n" style="color: #333;">t1</span><span class="p">,</span> <span class="n" style="color: #333;">t2</span><span class="p">)</span></span>
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127
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<pre style="margin: 0;">-<span id="LC127" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isFalsePmExpr</span> <span class="n" style="color: #333;">e2</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">eq</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">standby</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">unhandled</span><span class="p">,</span> <span class="n" style="color: #333;">env</span><span class="p">))</span></span>
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128
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205
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<pre style="margin: 0;"> <span id="LC205" class="line" lang="haskell"></span>
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206
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<pre style="margin: 0;"> <span id="LC206" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">y</span><span class="p">)</span></span>
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130
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207
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<pre style="margin: 0;"> <span id="LC207" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">solver_state</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="133" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -133,110 +210,68 @@ solveComplexEq solver_state@(standby, (unhandled, env)) eq@(e1, e2) = case eq of</td>
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133
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210
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<pre style="margin: 0;"> <span id="LC210" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">extendSubstAndSolve</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e2</span> <span class="n" style="color: #333;">solver_state</span></span>
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134
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211
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<pre style="margin: 0;"> <span id="LC211" class="line" lang="haskell"> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">extendSubstAndSolve</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e1</span> <span class="n" style="color: #333;">solver_state</span></span>
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212
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<pre style="margin: 0;"> <span id="LC212" class="line" lang="haskell"></span>
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136
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<pre style="margin: 0;">-<span id="LC136" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprEq</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprEq</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">eq</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">standby</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">unhandled</span><span class="p">,</span> <span class="n" style="color: #333;">env</span><span class="p">))</span></span>
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137
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<pre style="margin: 0;">-<span id="LC137" class="line" lang="haskell"></span>
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138
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213
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<pre style="margin: 0;"> <span id="LC213" 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;">WARN</span><span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"solveComplexEq: Catch all"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">eq</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC139" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">standby</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">True</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">env</span></span><span class="p"><span class="idiff right">))</span></span> <span class="c1" style="color: #998; font-style: italic;">-- I HATE CATCH-ALLS</span></span>
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<pre style="margin: 0;">+<span id="LC214" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;"><span class="idiff left right">solver_state</span></span> <span class="c1" style="color: #998; font-style: italic;">-- I HATE CATCH-ALLS</span></span>
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215
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<pre style="margin: 0;"> <span id="LC215" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC216" class="line" lang="haskell"><span class="cd">-- | Extend the substitution and solve the (possibly updated) constraints.</span></span>
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142
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<pre style="margin: 0;"> <span id="LC217" class="line" lang="haskell"><span class="n" style="color: #333;">extendSubstAndSolve</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span></span>
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<pre style="margin: 0;">-<span id="LC143" class="line" lang="haskell"><span class="n" style="color: #333;">extendSubstAndSolve</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span> <span class="p">(</span><span class="n" style="color: #333;">standby</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">unhandled</span><span class="p">,</span> <span class="n" style="color: #333;">env</span><span class="p">))</span></span>
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144
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<pre style="margin: 0;">-<span id="LC144" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldlM</span> <span class="n" style="color: #333;">solveComplexEq</span> <span class="n" style="color: #333;">new_incr_state</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">simplifyComplexEq</span> <span class="n" style="color: #333;">changed</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC218" class="line" lang="haskell"><span class="n" style="color: #333;">extendSubstAndSolve</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span> <span class="kt" style="color: #458; font-weight: 600;">TmS</span><span class="p">{</span> <span class="n" style="color: #333;">tm_facts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">facts</span><span class="p">,</span> <span class="n" style="color: #333;">tm_pos</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pos</span><span class="p">,</span> <span class="n" style="color: #333;">tm_neg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">neg</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC219" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isRefutable</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e'</span> <span class="n" style="color: #333;">neg</span> <span class="c1" style="color: #998; font-style: italic;">-- NB: e'</span></span>
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<pre style="margin: 0;">+<span id="LC220" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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221
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<pre style="margin: 0;">+<span id="LC221" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;">+<span id="LC222" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldlM</span> <span class="n" style="color: #333;">solveComplexEq</span> <span class="n" style="color: #333;">new_incr_state</span> <span class="n" style="color: #333;">changed</span></span>
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145
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<pre style="margin: 0;"> <span id="LC223" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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146
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<pre style="margin: 0;"> <span id="LC224" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Apply the substitution to the worklist and partition them to the ones</span></span>
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147
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<pre style="margin: 0;"> <span id="LC225" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- that had some progress and the rest. Then, recurse over the ones that</span></span>
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148
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<pre style="margin: 0;"> <span id="LC226" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- had some progress. Careful about performance:</span></span>
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149
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<pre style="margin: 0;"> <span id="LC227" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Representation of Term Equalities] in deSugar/Check.hs</span></span>
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150
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<pre style="margin: 0;">-<span id="LC150" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">changed</span><span class="p">,</span> <span class="n" style="color: #333;">unchanged</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">partitionWith</span> <span class="p">(</span><span class="n" style="color: #333;">substComplexEq</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="n" style="color: #333;">standby</span></span>
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151
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<pre style="margin: 0;">-<span id="LC151" class="line" lang="haskell"> <span class="n" style="color: #333;">new_incr_state</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">unchanged</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">unhandled</span><span class="p">,</span> <span class="n" style="color: #333;">extendNameEnv</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC228" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">changed</span><span class="p">,</span> <span class="n" style="color: #333;">unchanged</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">partitionWith</span> <span class="p">(</span><span class="n" style="color: #333;">substComplexEq</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="n" style="color: #333;">facts</span></span>
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<pre style="margin: 0;">+<span id="LC229" class="line" lang="haskell"> <span class="n" style="color: #333;">new_pos</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendNameEnv</span> <span class="n" style="color: #333;">pos</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;">+<span id="LC230" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- When e is a @PmExprVar y@, we have to check @y@'s solution for</span></span>
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<pre style="margin: 0;">+<span id="LC231" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- refutability instead. Afterwards, we have to merge @x@'s refutable shapes</span></span>
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<pre style="margin: 0;">+<span id="LC232" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to @y@'s. Actually, e == e' because it has been fully substituted before,</span></span>
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<pre style="margin: 0;">+<span id="LC233" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- but better be safe.</span></span>
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<pre style="margin: 0;">+<span id="LC234" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">y</span><span class="p">,</span> <span class="n" style="color: #333;">e'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">varDeepLookup</span> <span class="n" style="color: #333;">new_pos</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">+<span id="LC235" class="line" lang="haskell"> <span class="n" style="color: #333;">new_neg</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">neg</span></span>
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<pre style="margin: 0;">+<span id="LC236" 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;">case</span> <span class="n" style="color: #333;">lookupDNameEnv</span> <span class="n" style="color: #333;">neg</span> <span class="n" style="color: #333;">x</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC237" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">neg</span></span>
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<pre style="margin: 0;">+<span id="LC238" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">nalts</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC239" class="line" lang="haskell"> <span class="n" style="color: #333;">alterDNameEnv</span> <span class="p">(</span><span class="n" style="color: #333;">delNulls</span> <span class="p">(</span><span class="n" style="color: #333;">unionLists</span> <span class="n" style="color: #333;">nalts</span><span class="p">))</span> <span class="n" style="color: #333;">neg</span> <span class="n" style="color: #333;">y</span></span>
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<pre style="margin: 0;">+<span id="LC240" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">delFromDNameEnv</span><span class="p">`</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">+<span id="LC241" class="line" lang="haskell"> <span class="n" style="color: #333;">new_incr_state</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmS</span> <span class="n" style="color: #333;">unchanged</span> <span class="n" style="color: #333;">new_pos</span> <span class="n" style="color: #333;">new_neg</span></span>
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<pre style="margin: 0;"> <span id="LC242" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC243" class="line" lang="haskell"><span class="cd">-- | When we know that a variable is fresh, we do not actually have to</span></span>
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<pre style="margin: 0;"> <span id="LC244" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- check whether anything changes, we know that nothing does. Hence,</span></span>
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<pre style="margin: 0;"> <span id="LC245" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- `extendSubst` simply extends the substitution, unlike what</span></span>
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<pre style="margin: 0;"> <span id="LC246" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- `extendSubstAndSolve` does.</span></span>
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<pre style="margin: 0;"> <span id="LC247" class="line" lang="haskell"><span class="n" style="color: #333;">extendSubst</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;">PmExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span></span>
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<pre style="margin: 0;">-<span id="LC158" class="line" lang="haskell"><span class="n" style="color: #333;">extendSubst</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">e</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">standby</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">unhandled</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">env</span></span><span class="p"><span class="idiff right">))</span></span></span>
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<pre style="margin: 0;">+<span id="LC248" class="line" lang="haskell"><span class="n" style="color: #333;">extendSubst</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;"><span class="idiff left">solver_state</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">TmS</span></span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tm_pos</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">pos</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">}</span></span></span>
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<pre style="margin: 0;"> <span id="LC249" 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;">simpl_e</span></span>
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<pre style="margin: 0;">-<span id="LC160" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">standby</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">unhandled</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">extendNameEnv</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">env</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">simpl_e</span></span><span class="p"><span class="idiff right">))</span></span></span>
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161
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<pre style="margin: 0;">-<span id="LC161" 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="n" style="color: #333;"><span class="idiff">standby</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">True</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">env</span></span><span class="p"><span class="idiff right">))</span></span></span>
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<pre style="margin: 0;">+<span id="LC250" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left">solver_state</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tm_pos</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">extendNameEnv</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pos</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">simpl_e</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">}</span></span></span>
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<pre style="margin: 0;">+<span id="LC251" 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 right">solver_state</span></span></span>
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162
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252
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<pre style="margin: 0;"> <span id="LC252" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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163
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<pre style="margin: 0;"> <span id="LC253" class="line" lang="haskell"> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">idName</span> <span class="n" style="color: #333;">y</span></span>
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164
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<pre style="margin: 0;">-<span id="LC164" class="line" lang="haskell"> <span class="n" style="color: #333;">simpl_e</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fst</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">simplifyPmExpr</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">exprDeepLookup</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">e</span></span>
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165
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<pre style="margin: 0;">-<span id="LC165" class="line" lang="haskell"></span>
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166
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<pre style="margin: 0;">-<span id="LC166" class="line" lang="haskell"><span class="cd">-- | Simplify a complex equality.</span></span>
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<pre style="margin: 0;">-<span id="LC167" class="line" lang="haskell"><span class="n" style="color: #333;">simplifyComplexEq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ComplexEq</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ComplexEq</span></span>
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<pre style="margin: 0;">-<span id="LC168" class="line" lang="haskell"><span class="n" style="color: #333;">simplifyComplexEq</span> <span class="p">(</span><span class="n" style="color: #333;">e1</span><span class="p">,</span> <span class="n" style="color: #333;">e2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">fst</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">simplifyPmExpr</span> <span class="n" style="color: #333;">e1</span><span class="p">,</span> <span class="n" style="color: #333;">fst</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">simplifyPmExpr</span> <span class="n" style="color: #333;">e2</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC169" class="line" lang="haskell"></span>
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170
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<pre style="margin: 0;">-<span id="LC170" class="line" lang="haskell"><span class="cd">-- | Simplify an expression. The boolean indicates if there has been any</span></span>
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<pre style="margin: 0;">-<span id="LC171" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- simplification or if the operation was a no-op.</span></span>
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172
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<pre style="margin: 0;">-<span id="LC172" class="line" lang="haskell"><span class="n" style="color: #333;">simplifyPmExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExpr</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">)</span></span>
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173
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<pre style="margin: 0;">-<span id="LC173" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Deep equalities]</span></span>
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<pre style="margin: 0;">-<span id="LC174" class="line" lang="haskell"><span class="n" style="color: #333;">simplifyPmExpr</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">e</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC175" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c</span> <span class="n" style="color: #333;">ts</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">mapAndUnzip</span> <span class="n" style="color: #333;">simplifyPmExpr</span> <span class="n" style="color: #333;">ts</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC176" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ts'</span><span class="p">,</span> <span class="n" style="color: #333;">bs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c</span> <span class="n" style="color: #333;">ts'</span><span class="p">,</span> <span class="n" style="color: #333;">or</span> <span class="n" style="color: #333;">bs</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC177" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmExprEq</span> <span class="n" style="color: #333;">t1</span> <span class="n" style="color: #333;">t2</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">simplifyEqExpr</span> <span class="n" style="color: #333;">t1</span> <span class="n" style="color: #333;">t2</span></span>
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178
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<pre style="margin: 0;">-<span id="LC178" class="line" lang="haskell"> <span class="n" style="color: #333;">_other_expr</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">e</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- the others are terminals</span></span>
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179
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<pre style="margin: 0;">-<span id="LC179" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC180" class="line" lang="haskell"><span class="cd">-- | Simplify an equality expression. The equality is given in parts.</span></span>
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181
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<pre style="margin: 0;">-<span id="LC181" class="line" lang="haskell"><span class="n" style="color: #333;">simplifyEqExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExpr</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">)</span></span>
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182
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<pre style="margin: 0;">-<span id="LC182" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Deep equalities]</span></span>
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<pre style="margin: 0;">-<span id="LC183" class="line" lang="haskell"><span class="n" style="color: #333;">simplifyEqExpr</span> <span class="n" style="color: #333;">e1</span> <span class="n" style="color: #333;">e2</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="p">(</span><span class="n" style="color: #333;">e1</span><span class="p">,</span> <span class="n" style="color: #333;">e2</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="LC184" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Varables</span></span>
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<pre style="margin: 0;">-<span id="LC185" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">y</span><span class="p">)</span></span>
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186
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<pre style="margin: 0;">-<span id="LC186" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">truePmExpr</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">)</span></span>
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187
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<pre style="margin: 0;">-<span id="LC187" class="line" lang="haskell"></span>
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188
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<pre style="margin: 0;">-<span id="LC188" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Literals</span></span>
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189
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<pre style="margin: 0;">-<span id="LC189" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprLit</span> <span class="n" style="color: #333;">l1</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprLit</span> <span class="n" style="color: #333;">l2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">eqPmLit</span> <span class="n" style="color: #333;">l1</span> <span class="n" style="color: #333;">l2</span> <span class="kr" style="font-weight: 600;">of</span></span>
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190
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<pre style="margin: 0;">-<span id="LC190" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Undecidable Equality for Overloaded Literals]</span></span>
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191
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<pre style="margin: 0;">-<span id="LC191" 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="p">(</span><span class="n" style="color: #333;">truePmExpr</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">)</span></span>
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192
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<pre style="margin: 0;">-<span id="LC192" 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="p">(</span><span class="n" style="color: #333;">falsePmExpr</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">)</span></span>
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193
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<pre style="margin: 0;">-<span id="LC193" class="line" lang="haskell"></span>
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194
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<pre style="margin: 0;">-<span id="LC194" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Can potentially be simplified</span></span>
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195
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<pre style="margin: 0;">-<span id="LC195" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprEq</span> <span class="p">{},</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">case</span> <span class="p">(</span><span class="n" style="color: #333;">simplifyPmExpr</span> <span class="n" style="color: #333;">e1</span><span class="p">,</span> <span class="n" style="color: #333;">simplifyPmExpr</span> <span class="n" style="color: #333;">e2</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span></span>
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196
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<pre style="margin: 0;">-<span id="LC196" class="line" lang="haskell"> <span class="p">((</span><span class="n" style="color: #333;">e1'</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="p">),</span> <span class="p">(</span><span class="n" style="color: #333;">e2'</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">))</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">simplifyEqExpr</span> <span class="n" style="color: #333;">e1'</span> <span class="n" style="color: #333;">e2'</span></span>
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<td class="diff-line-num old old_line" data-linenumber="197" 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">
197
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<pre style="margin: 0;">-<span id="LC197" class="line" lang="haskell"> <span class="p">((</span><span class="n" style="color: #333;">e1'</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">),</span> <span class="p">(</span><span class="n" style="color: #333;">e2'</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="p">))</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">simplifyEqExpr</span> <span class="n" style="color: #333;">e1'</span> <span class="n" style="color: #333;">e2'</span></span>
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<td class="diff-line-num old old_line" data-linenumber="198" 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">
198
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<pre style="margin: 0;">-<span id="LC198" class="line" lang="haskell"> <span class="p">((</span><span class="n" style="color: #333;">e1'</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">),</span> <span class="p">(</span><span class="n" style="color: #333;">e2'</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">))</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprEq</span> <span class="n" style="color: #333;">e1'</span> <span class="n" style="color: #333;">e2'</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- cannot progress</span></span>
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<td class="diff-line-num old old_line" data-linenumber="199" 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">
199
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<pre style="margin: 0;">-<span id="LC199" class="line" lang="haskell"> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprEq</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">case</span> <span class="p">(</span><span class="n" style="color: #333;">simplifyPmExpr</span> <span class="n" style="color: #333;">e1</span><span class="p">,</span> <span class="n" style="color: #333;">simplifyPmExpr</span> <span class="n" style="color: #333;">e2</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<td class="diff-line-num old old_line" data-linenumber="200" 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">
200
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<pre style="margin: 0;">-<span id="LC200" class="line" lang="haskell"> <span class="p">((</span><span class="n" style="color: #333;">e1'</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="p">),</span> <span class="p">(</span><span class="n" style="color: #333;">e2'</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">))</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">simplifyEqExpr</span> <span class="n" style="color: #333;">e1'</span> <span class="n" style="color: #333;">e2'</span></span>
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<td class="diff-line-num old old_line" data-linenumber="201" 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">
201
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<pre style="margin: 0;">-<span id="LC201" class="line" lang="haskell"> <span class="p">((</span><span class="n" style="color: #333;">e1'</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">),</span> <span class="p">(</span><span class="n" style="color: #333;">e2'</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="p">))</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">simplifyEqExpr</span> <span class="n" style="color: #333;">e1'</span> <span class="n" style="color: #333;">e2'</span></span>
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<td class="diff-line-num old old_line" data-linenumber="202" 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">
202
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<pre style="margin: 0;">-<span id="LC202" class="line" lang="haskell"> <span class="p">((</span><span class="n" style="color: #333;">e1'</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">),</span> <span class="p">(</span><span class="n" style="color: #333;">e2'</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">))</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprEq</span> <span class="n" style="color: #333;">e1'</span> <span class="n" style="color: #333;">e2'</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- cannot progress</span></span>
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<td class="diff-line-num old old_line" data-linenumber="203" 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">
203
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<pre style="margin: 0;">-<span id="LC203" class="line" lang="haskell"></span>
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204
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<pre style="margin: 0;">-<span id="LC204" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Constructors</span></span>
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<td class="diff-line-num old old_line" data-linenumber="205" 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">
205
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<pre style="margin: 0;">-<span id="LC205" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c1</span> <span class="n" style="color: #333;">ts1</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c2</span> <span class="n" style="color: #333;">ts2</span><span class="p">)</span></span>
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<td class="diff-line-num old old_line" data-linenumber="206" 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">
206
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<pre style="margin: 0;">-<span id="LC206" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">c1</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">c2</span> <span class="o" style="font-weight: 600;">-></span></span>
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<td class="diff-line-num old old_line" data-linenumber="207" 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">
207
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<pre style="margin: 0;">-<span id="LC207" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">ts1'</span><span class="p">,</span> <span class="n" style="color: #333;">bs1</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapAndUnzip</span> <span class="n" style="color: #333;">simplifyPmExpr</span> <span class="n" style="color: #333;">ts1</span></span>
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<td class="diff-line-num old old_line" data-linenumber="208" 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">
208
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<pre style="margin: 0;">-<span id="LC208" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ts2'</span><span class="p">,</span> <span class="n" style="color: #333;">bs2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapAndUnzip</span> <span class="n" style="color: #333;">simplifyPmExpr</span> <span class="n" style="color: #333;">ts2</span></span>
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<td class="diff-line-num old old_line" data-linenumber="209" 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">
209
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<td class="diff-line-num new_line old" data-linenumber="254" 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="LC209" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">tss</span><span class="p">,</span> <span class="n" style="color: #333;">_bss</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">zipWithAndUnzip</span> <span class="n" style="color: #333;">simplifyEqExpr</span> <span class="n" style="color: #333;">ts1'</span> <span class="n" style="color: #333;">ts2'</span></span>
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<td class="diff-line-num old old_line" data-linenumber="210" 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">
210
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<pre style="margin: 0;">-<span id="LC210" class="line" lang="haskell"> <span class="n" style="color: #333;">worst_case</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprEq</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c1</span> <span class="n" style="color: #333;">ts1'</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c2</span> <span class="n" style="color: #333;">ts2'</span><span class="p">)</span></span>
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<td class="diff-line-num old old_line" data-linenumber="211" 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">
211
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<pre style="margin: 0;">-<span id="LC211" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="kr" style="font-weight: 600;">if</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">or</span> <span class="n" style="color: #333;">bs1</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">or</span> <span class="n" style="color: #333;">bs2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">worst_case</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- no progress</span></span>
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<td class="diff-line-num old old_line" data-linenumber="212" 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">
212
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<pre style="margin: 0;">-<span id="LC212" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">all</span> <span class="n" style="color: #333;">isTruePmExpr</span> <span class="n" style="color: #333;">tss</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">truePmExpr</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">)</span></span>
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213
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<pre style="margin: 0;">-<span id="LC213" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">any</span> <span class="n" style="color: #333;">isFalsePmExpr</span> <span class="n" style="color: #333;">tss</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">falsePmExpr</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC214" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">worst_case</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC215" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">falsePmExpr</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC216" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC217" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We cannot do anything about the rest..</span></span>
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<pre style="margin: 0;">-<span id="LC218" class="line" lang="haskell"> <span class="n" style="color: #333;">_other_equality</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">original</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC219" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC220" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC221" class="line" lang="haskell"> <span class="n" style="color: #333;">original</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprEq</span> <span class="n" style="color: #333;">e1</span> <span class="n" style="color: #333;">e2</span> <span class="c1" style="color: #998; font-style: italic;">-- reconstruct equality</span></span>
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<pre style="margin: 0;">+<span id="LC254" class="line" lang="haskell"> <span class="n" style="color: #333;">simpl_e</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">exprDeepLookup</span> <span class="n" style="color: #333;">pos</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;"> <span id="LC255" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC256" class="line" lang="haskell"><span class="cd">-- | Apply an (un-flattened) substitution to a simple equality.</span></span>
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<pre style="margin: 0;"> <span id="LC257" class="line" lang="haskell"><span class="n" style="color: #333;">applySubstComplexEq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmVarEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ComplexEq</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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<pre style="margin: 0;"> <span id="LC258" class="line" lang="haskell"><span class="n" style="color: #333;">applySubstComplexEq</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="n" style="color: #333;">e1</span><span class="p">,</span><span class="n" style="color: #333;">e2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">exprDeepLookup</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">e1</span><span class="p">,</span> <span class="n" style="color: #333;">exprDeepLookup</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">e2</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC259" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC227" class="line" lang="haskell"><span class="cd">-- | Apply an (un-flattened) substitution to a variable.</span></span>
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<pre style="margin: 0;">-<span id="LC228" class="line" lang="haskell"><span class="n" style="color: #333;">varDeepLookup</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmVarEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span></span>
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<pre style="margin: 0;">-<span id="LC229" class="line" lang="haskell"><span class="n" style="color: #333;">varDeepLookup</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">-<span id="LC230" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupNameEnv</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">exprDeepLookup</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">e</span> <span class="c1" style="color: #998; font-style: italic;">-- go deeper</span></span>
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<pre style="margin: 0;">-<span id="LC231" 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;">PmExprVar</span> <span class="n" style="color: #333;">x</span> <span class="c1" style="color: #998; font-style: italic;">-- terminal</span></span>
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<pre style="margin: 0;">+<span id="LC260" class="line" lang="haskell"><span class="cd">-- | Apply an (un-flattened) substitution to a variable and return its</span></span>
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<pre style="margin: 0;">+<span id="LC261" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- representative in the triangular substitution @env@ and the completely</span></span>
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262
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<pre style="margin: 0;">+<span id="LC262" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- substituted expression. The latter may just be the representative wrapped</span></span>
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263
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<pre style="margin: 0;">+<span id="LC263" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- with 'PmExprVar' if we haven't found a solution for it yet.</span></span>
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264
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<pre style="margin: 0;">+<span id="LC264" class="line" lang="haskell"><span class="n" style="color: #333;">varDeepLookup</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmVarEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span><span class="p">)</span></span>
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265
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<pre style="margin: 0;">+<span id="LC265" class="line" lang="haskell"><span class="n" style="color: #333;">varDeepLookup</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lookupNameEnv</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">x</span> <span class="kr" style="font-weight: 600;">of</span></span>
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266
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<pre style="margin: 0;">+<span id="LC266" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">y</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">varDeepLookup</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">y</span></span>
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267
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<pre style="margin: 0;">+<span id="LC267" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="n" style="color: #333;">exprDeepLookup</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- go deeper</span></span>
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268
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<pre style="margin: 0;">+<span id="LC268" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- terminal</span></span>
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232
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269
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<pre style="margin: 0;"> <span id="LC269" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINE varDeepLookup #-}</span></span>
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233
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270
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<pre style="margin: 0;"> <span id="LC270" class="line" lang="haskell"></span>
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234
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271
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<pre style="margin: 0;"> <span id="LC271" class="line" lang="haskell"><span class="cd">-- | Apply an (un-flattened) substitution to an expression.</span></span>
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235
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<pre style="margin: 0;"> <span id="LC272" class="line" lang="haskell"><span class="n" style="color: #333;">exprDeepLookup</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmVarEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmExpr</span></span>
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236
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<pre style="margin: 0;">-<span id="LC236" class="line" lang="haskell"><span class="n" style="color: #333;">exprDeepLookup</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left">varDeepLookup</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">env</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">x</span></span></span>
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273
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<pre style="margin: 0;">+<span id="LC273" class="line" lang="haskell"><span class="n" style="color: #333;">exprDeepLookup</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprVar</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left">snd</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">varDeepLookup</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">env</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="p"><span class="idiff right">)</span></span></span>
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237
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274
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<pre style="margin: 0;"> <span id="LC274" class="line" lang="haskell"><span class="n" style="color: #333;">exprDeepLookup</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c</span> <span class="n" style="color: #333;">es</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">exprDeepLookup</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">es</span><span class="p">)</span></span>
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238
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<pre style="margin: 0;">-<span id="LC238" class="line" lang="haskell"><span class="n" style="color: #333;">exprDeepLookup</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprEq</span> <span class="n" style="color: #333;">e1</span> <span class="n" style="color: #333;">e2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprEq</span> <span class="p">(</span><span class="n" style="color: #333;">exprDeepLookup</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">e1</span><span class="p">)</span></span>
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239
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<pre style="margin: 0;">-<span id="LC239" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">exprDeepLookup</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">e2</span><span class="p">)</span></span>
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240
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<pre style="margin: 0;"> <span id="LC275" class="line" lang="haskell"><span class="n" style="color: #333;">exprDeepLookup</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">other_expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">other_expr</span> <span class="c1" style="color: #998; font-style: italic;">-- PmExprLit, PmExprOther</span></span>
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241
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276
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<pre style="margin: 0;"> <span id="LC276" class="line" lang="haskell"></span>
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242
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<pre style="margin: 0;"> <span id="LC277" class="line" lang="haskell"><span class="cd">-- | External interface to the term oracle.</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">@@ -248,18 +283,57 @@ pmLitType :: PmLit -> Type -- should be in PmExpr but gives cyclic imports :(</td>
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<pre style="margin: 0;"> <span id="LC283" class="line" lang="haskell"><span class="n" style="color: #333;">pmLitType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmSLit</span> <span class="n" style="color: #333;">lit</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hsLitType</span> <span class="n" style="color: #333;">lit</span></span>
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<pre style="margin: 0;"> <span id="LC284" class="line" lang="haskell"><span class="n" style="color: #333;">pmLitType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmOLit</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">lit</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">overLitType</span> <span class="n" style="color: #333;">lit</span></span>
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<pre style="margin: 0;"> <span id="LC285" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC251" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Deep equalities]</span></span>
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<pre style="margin: 0;">-<span id="LC252" 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="LC253" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Solving nested equalities is the most difficult part. The general strategy</span></span>
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<pre style="margin: 0;">-<span id="LC254" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is the following:</span></span>
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<pre style="margin: 0;">+<span id="LC286" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Refutable shapes]</span></span>
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<pre style="margin: 0;">+<span id="LC287" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;"> <span id="LC288" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC256" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Equalities of the form (True ~ (e1 ~ e2)) are transformed to just</span></span>
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<pre style="margin: 0;">-<span id="LC257" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (e1 ~ e2) and then treated recursively.</span></span>
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<pre style="margin: 0;">+<span id="LC289" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider a pattern match like</span></span>
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<pre style="margin: 0;"> <span id="LC290" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC259" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Equalities of the form (False ~ (e1 ~ e2)) cannot be analyzed unless</span></span>
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<pre style="margin: 0;">-<span id="LC260" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> we know more about the inner equality (e1 ~ e2). That's exactly what</span></span>
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<pre style="margin: 0;">-<span id="LC261" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> `simplifyEqExpr' tries to do: It takes e1 and e2 and either returns</span></span>
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<pre style="margin: 0;">-<span id="LC262" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> truePmExpr, falsePmExpr or (e1' ~ e2') in case it is uncertain. Note</span></span>
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<pre style="margin: 0;">-<span id="LC263" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> that it is not e but rather e', since it may perform some</span></span>
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<pre style="margin: 0;">-<span id="LC264" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> simplifications deeper.</span></span>
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<pre style="margin: 0;">-<span id="LC265" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span></pre>
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<pre style="margin: 0;">+<span id="LC291" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> foo x</span></span>
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<pre style="margin: 0;">+<span id="LC292" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | 0 <- x = 42</span></span>
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<pre style="margin: 0;">+<span id="LC293" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | 0 <- x = 43</span></span>
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294
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<pre style="margin: 0;">+<span id="LC294" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | 1 <- x = 44</span></span>
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295
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<pre style="margin: 0;">+<span id="LC295" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | otherwise = 45</span></span>
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296
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<pre style="margin: 0;">+<span id="LC296" class="line" lang="haskell"></span>
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297
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<pre style="margin: 0;">+<span id="LC297" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This will result in the following initial matching problem:</span></span>
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298
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<pre style="margin: 0;">+<span id="LC298" class="line" lang="haskell"></span>
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299
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<pre style="margin: 0;">+<span id="LC299" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> PatVec: x (0 <- x)</span></span>
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300
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<pre style="margin: 0;">+<span id="LC300" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ValVec: $tm_y</span></span>
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301
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<pre style="margin: 0;">+<span id="LC301" class="line" lang="haskell"></span>
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302
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<pre style="margin: 0;">+<span id="LC302" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Where the first line is the pattern vector and the second line is the value</span></span>
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303
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<pre style="margin: 0;">+<span id="LC303" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">vector abstraction. When we handle the first pattern guard in Check, it will be</span></span>
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304
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<pre style="margin: 0;">+<span id="LC304" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">desugared to a match of the form</span></span>
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<pre style="margin: 0;">+<span id="LC305" class="line" lang="haskell"></span>
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306
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<pre style="margin: 0;">+<span id="LC306" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> PatVec: x 0</span></span>
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307
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<pre style="margin: 0;">+<span id="LC307" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ValVec: $tm_y x</span></span>
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308
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<pre style="margin: 0;">+<span id="LC308" class="line" lang="haskell"></span>
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309
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<pre style="margin: 0;">+<span id="LC309" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In LitVar, this will split the value vector abstraction for `x` into a positive</span></span>
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310
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<pre style="margin: 0;">+<span id="LC310" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">`PmLit 0` and a negative `PmLit x [0]` value abstraction. While the former is</span></span>
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311
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<pre style="margin: 0;">+<span id="LC311" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">immediately matched against the pattern vector, the latter (vector value</span></span>
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312
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<pre style="margin: 0;">+<span id="LC312" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">abstraction `~[0] $tm_y`) is completely uncovered by the clause.</span></span>
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313
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<pre style="margin: 0;">+<span id="LC313" class="line" lang="haskell"></span>
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314
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<pre style="margin: 0;">+<span id="LC314" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">`pmcheck` proceeds by *discarding* the the value vector abstraction involving</span></span>
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315
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<pre style="margin: 0;">+<span id="LC315" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the guard to accomodate for the desugaring. But this also discards the valuable</span></span>
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316
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<pre style="margin: 0;">+<span id="LC316" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">information that `x` certainly is not the literal 0! Consequently, we wouldn't</span></span>
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<pre style="margin: 0;">+<span id="LC317" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">be able to report the second clause as redundant.</span></span>
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318
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<pre style="margin: 0;">+<span id="LC318" class="line" lang="haskell"></span>
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319
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<pre style="margin: 0;">+<span id="LC319" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">That's a typical example of why we need the term oracle, and in this specific</span></span>
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320
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<pre style="margin: 0;">+<span id="LC320" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">case, the ability to encode that `x` certainly is not the literal 0. Now the</span></span>
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321
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<pre style="margin: 0;">+<span id="LC321" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">term oracle can immediately refute the constraint `x ~ 0` generated by the</span></span>
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322
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<pre style="margin: 0;">+<span id="LC322" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">second clause and report the clause as redundant. After the third clause, the</span></span>
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323
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<pre style="margin: 0;">+<span id="LC323" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">set of such *refutable* literals is again extended to `[0, 1]`.</span></span>
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324
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<pre style="margin: 0;">+<span id="LC324" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC325" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In general, we want to store a set of refutable shapes (`PmAltCon`) for each</span></span>
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326
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<pre style="margin: 0;">+<span id="LC326" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">variable. That's the purpose of the `PmRefutEnv`. This extends to</span></span>
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<pre style="margin: 0;">+<span id="LC327" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">`ConLike`s, where all value arguments are universally quantified implicitly.</span></span>
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328
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<pre style="margin: 0;">+<span id="LC328" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So, if the `PmRefutEnv` contains an entry for `x` with `Just [Bool]`, then this</span></span>
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329
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<pre style="margin: 0;">+<span id="LC329" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">corresponds to the fact that `forall y. x ≁ Just @Bool y`.</span></span>
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<pre style="margin: 0;">+<span id="LC330" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC331" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">`addSolveRefutableAltCon` will add such a refutable mapping to the `PmRefutEnv`</span></span>
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332
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<pre style="margin: 0;">+<span id="LC332" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in the term oracles state and check if causes any immediate contradiction.</span></span>
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<pre style="margin: 0;">+<span id="LC333" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Whenever we record a solution in the substitution via `extendSubstAndSolve`, the</span></span>
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<pre style="margin: 0;">+<span id="LC334" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">refutable environment is checked for any matching refutable `PmAltCon`.</span></span>
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335
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<pre style="margin: 0;">+<span id="LC335" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC336" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that `PmAltConLike` carries a list of type arguments. This purely for the</span></span>
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337
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<pre style="margin: 0;">+<span id="LC337" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">purpose of being able to reconstruct all other constructors of the matching</span></span>
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338
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<pre style="margin: 0;">+<span id="LC338" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">group the `ConLike` is part of through calling `allCompleteMatches` in Check.</span></span>
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339
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<pre style="margin: 0;">+<span id="LC339" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span></pre>
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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">@@ -324,6 +324,7 @@ Library</td>
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<pre style="margin: 0;"> <span id="LC324" class="line" lang="plaintext"> MkCore</span>
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<pre style="margin: 0;"> <span id="LC325" class="line" lang="plaintext"> PprCore</span>
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<pre style="margin: 0;"> <span id="LC326" class="line" lang="plaintext"> PmExpr</span>
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<pre style="margin: 0;">+<span id="LC327" class="line" lang="plaintext"> PmPpr</span>
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<pre style="margin: 0;"> <span id="LC328" class="line" lang="plaintext"> TmOracle</span>
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<pre style="margin: 0;"> <span id="LC329" class="line" lang="plaintext"> Check</span>
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<pre style="margin: 0;"> <span id="LC330" class="line" lang="plaintext"> Coverage</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/08c42ce3b5f425654e8ae49ca1c54c1471017d43#2cbc08c5f3b1dcbc9c763a836b51491224c05e50"><strong>compiler/utils/ListSetOps.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">@@ -14,7 +14,7 @@ module ListSetOps (</td>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Assoc</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">assoc</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">assocMaybe</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">assocUsing</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">assocDefault</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">assocDefaultUsing</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"></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;">-- Duplicate handling</span></span>
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<pre style="margin: 0;">-<span id="LC17" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">hasNoDups</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">removeDups</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">findDupsEq</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">hasNoDups</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">removeDups</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">findDupsEq</span><span class="p">,</span><span class="idiff left"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">insertNoDup</span></span><span class="p"><span class="idiff right">,</span></span></span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">equivClasses</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Indexing</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">@@ -169,3 +169,10 @@ findDupsEq _ [] = []</td>
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<pre style="margin: 0;"> <span id="LC169" class="line" lang="haskell"><span class="n" style="color: #333;">findDupsEq</span> <span class="n" style="color: #333;">eq</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">xs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">eq_xs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">findDupsEq</span> <span class="n" style="color: #333;">eq</span> <span class="n" style="color: #333;">xs</span></span>
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<pre style="margin: 0;"> <span id="LC170" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">:|</span> <span class="n" style="color: #333;">eq_xs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">findDupsEq</span> <span class="n" style="color: #333;">eq</span> <span class="n" style="color: #333;">neq_xs</span></span>
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<pre style="margin: 0;"> <span id="LC171" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="p">(</span><span class="n" style="color: #333;">eq_xs</span><span class="p">,</span> <span class="n" style="color: #333;">neq_xs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">partition</span> <span class="p">(</span><span class="n" style="color: #333;">eq</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="n" style="color: #333;">xs</span></span>
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<pre style="margin: 0;">+<span id="LC172" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC173" class="line" lang="haskell"><span class="cd">-- | \( O(n) \). @'insertNoDup' x xs@ treats @xs@ as a set, inserting @x@ only</span></span>
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<pre style="margin: 0;">+<span id="LC174" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- when an equal element couldn't be found in @xs@.</span></span>
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<pre style="margin: 0;">+<span id="LC175" class="line" lang="haskell"><span class="n" style="color: #333;">insertNoDup</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Eq</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC176" class="line" lang="haskell"><span class="n" style="color: #333;">insertNoDup</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">set</span></span>
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<pre style="margin: 0;">+<span id="LC177" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">find</span> <span class="p">(</span><span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="n" style="color: #333;">set</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">x</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">set</span></span>
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<pre style="margin: 0;">+<span id="LC178" 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;">set</span></span></pre>
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