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<h3>
Sebastian Graf pushed to branch wip/T18249
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/f1abbd98e5bc41f51e9fab748adbae4608f06ba3">f1abbd98</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-09-17T10:57:22+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Rewrite inhabitation test
We used to produce inhabitants of a pattern-match refinement type Nabla
in the checker in at least two different and mostly redundant ways:
1. There was `provideEvidence` which is used by `GHC.HsToCore.PmCheck`
to produce non-exhaustive patterns, which produces inhabitants of a
Nabla as a sub-refinement type where all match variables are
instantiated.
2. There also was `ensure{,All}Inhabited` which worked slightly
different, but was whenever new type constraints or negative term
constraints were added. See below why `provideEvidence` and
`ensureAllInhabited` can't be the same function, the main reason
being performance.
3. And last but not least there was the `nonVoid` test, which tested
that a given type was inhabited. We did use this for strict fields
and -XEmptyCase in the past.
The overlap of (3) with (2) was always a major pet peeve of mine. The
latter was quite efficient and proven to work for recursive data types,
etc, but could not handle negative constraints well (e.g. we often want
to know if a *refined* type is empty, such as @{ x:[a] | x /= [] }@).
Lower Your Guards suggested that we could get by with just one, by
replacing both functions with `inhabitationTest` in this patch.
That was only possible by implementing the structure of φ constraints
as in the paper, namely the semantics of φ constructor constraints.
This has a number of benefits:
a. Proper handling of unlifted types and strict fields, fixing #18249,
without any code duplication between
`GHC.HsToCore.PmCheck.Oracle.instCon` (was `mkOneConFull`) and
`GHC.HsToCore.PmCheck.checkGrd`.
b. `instCon` can perform the `nonVoid` test (3) simply by emitting
unliftedness constraints for strict fields.
c. `nonVoid` (3) is thus simply expressed by a call to
`inhabitationTest`.
d. Similarly, `ensureAllInhabited` (2), which we called after adding
type info, now can similarly be expressed as the fuel-based
`inhabitationTest`.
See the new `Note [Why inhabitationTest doesn't call generateInhabitants]`
why we still have to stick to "test" (1).
Fixes #18249.
Metric Decrease:
T17836
T17836b
</pre>
</li>
</ul>
<h4>13 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#4aad0050db1a8a20db8bbca149111de99cb299c9">
compiler/GHC/Core/TyCon.hs
</a>
</li>
<li class="file-stats">
<a href="#cc97d81e7223ad4a3a5e801156ca632f9fa75654">
compiler/GHC/Hs/Expr.hs
</a>
</li>
<li class="file-stats">
<a href="#ac0a6473a902628a18b3a470122e5cc1ce09de14">
compiler/GHC/HsToCore/PmCheck.hs
</a>
</li>
<li class="file-stats">
<a href="#8d8e5922fde8bc19ffa2bc9cae6b6720abb88564">
compiler/GHC/HsToCore/PmCheck/Oracle.hs
</a>
</li>
<li class="file-stats">
<a href="#16160f179df308e914fffee87ce52c9a048bde89">
compiler/GHC/HsToCore/PmCheck/Ppr.hs
</a>
</li>
<li class="file-stats">
<a href="#a90b29966ba2a86c0f6927651648cb062f00ea03">
compiler/GHC/HsToCore/PmCheck/Types.hs
</a>
</li>
<li class="file-stats">
<a href="#c69516c9e3cf2716177602126901a5efa3e92675">
compiler/GHC/HsToCore/PmCheck/Types.hs-boot
</a>
</li>
<li class="file-stats">
<a href="#902811828741e6bcd64702935bbb54edbbd070ef">
compiler/GHC/Tc/Gen/Expr.hs
</a>
</li>
<li class="file-stats">
<a href="#0a783845cf4a51b83c014878c91e4431b84593e8">
<span class="new-file">
+
compiler/GHC/Types/Unique/FuelTank.hs
</span>
</a>
</li>
<li class="file-stats">
<a href="#0f33fd88c617246c7f89c4477d2d1d24f942df23">
compiler/ghc.cabal.in
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</li>
<li class="file-stats">
<a href="#9de9b4ec5912bd8bfa5c7fdf03a23a09bb21ef46">
<span class="new-file">
+
testsuite/tests/pmcheck/should_compile/T18249.hs
</span>
</a>
</li>
<li class="file-stats">
<a href="#307f80581cbcfe76d629bd3d5d781205678b0fc3">
<span class="new-file">
+
testsuite/tests/pmcheck/should_compile/T18249.stderr
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</a>
</li>
<li class="file-stats">
<a href="#a52966ece03f9e76a93a2c4ea96b9fb25368723d">
testsuite/tests/pmcheck/should_compile/all.T
</a>
</li>
</ul>
<h4>Changes:</h4>
<li id="4aad0050db1a8a20db8bbca149111de99cb299c9">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f1abbd98e5bc41f51e9fab748adbae4608f06ba3#4aad0050db1a8a20db8bbca149111de99cb299c9"><strong>compiler/GHC/Core/TyCon.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="161" 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">@@ -161,6 +161,7 @@ import GHC.Types.Basic</td>
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<pre style="margin: 0;"> <span id="LC161" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.ForeignCall</span></span>
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<pre style="margin: 0;"> <span id="LC162" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Name</span></span>
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<pre style="margin: 0;"> <span id="LC163" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Name.Env</span></span>
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<pre style="margin: 0;">+<span id="LC164" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Unique.FuelTank</span></span>
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<td class="diff-line-num new_line" data-linenumber="165" 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="LC165" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Coercion.Axiom</span></span>
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<pre style="margin: 0;"> <span id="LC166" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Builtin.Names</span></span>
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<pre style="margin: 0;"> <span id="LC167" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.Maybe</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2747" 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="2748" 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">@@ -2747,13 +2748,11 @@ good to be able to unwrap multiple layers.</td>
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<pre style="margin: 0;"> <span id="LC2748" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The function that manages all this is checkRecTc.</span></span>
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<pre style="margin: 0;"> <span id="LC2749" 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="LC2750" class="line" lang="haskell"></span>
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<td class="diff-line-num new_line old" data-linenumber="2751" 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="LC2750" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">RecTcChecker</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">RC</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="kt" style="color: #458; font-weight: 600;">NameEnv</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="LC2751" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The upper bound, and the number of times</span></span>
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<pre style="margin: 0;">-<span id="LC2752" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we have encountered each TyCon</span></span>
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<pre style="margin: 0;">+<span id="LC2751" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">RecTcChecker</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">RC</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FuelTank</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2752" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2753" class="line" lang="haskell"><span class="cd">-- | Initialise a 'RecTcChecker' with 'defaultRecTcMaxBound'.</span></span>
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2755
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2754
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<pre style="margin: 0;"> <span id="LC2754" class="line" lang="haskell"><span class="n" style="color: #333;">initRecTc</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">RecTcChecker</span></span>
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2756
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<pre style="margin: 0;">-<span id="LC2756" class="line" lang="haskell"><span class="n" style="color: #333;">initRecTc</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">RC</span> <span class="n" style="color: #333;"><span class="idiff left">defaultRecTcMaxBound</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">emptyNameEnv</span></span></span>
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2755
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<pre style="margin: 0;">+<span id="LC2755" class="line" lang="haskell"><span class="n" style="color: #333;">initRecTc</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">RC</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">initFuelTank</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">defaultRecTcMaxBound</span></span><span class="p"><span class="idiff right">)</span></span></span>
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2757
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2756
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<pre style="margin: 0;"> <span id="LC2756" class="line" lang="haskell"></span>
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2758
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2757
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<pre style="margin: 0;"> <span id="LC2757" class="line" lang="haskell"><span class="cd">-- | The default upper bound (100) for the number of times a 'RecTcChecker' is</span></span>
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2759
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2758
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<pre style="margin: 0;"> <span id="LC2758" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- allowed to encounter each 'TyCon'.</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">@@ -2764,18 +2763,14 @@ defaultRecTcMaxBound = 100</td>
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2764
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2763
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<pre style="margin: 0;"> <span id="LC2763" class="line" lang="haskell"><span class="cd">-- | Change the upper bound for the number of times a 'RecTcChecker' is allowed</span></span>
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2765
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2764
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<pre style="margin: 0;"> <span id="LC2764" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- to encounter each 'TyCon'.</span></span>
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2766
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2765
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<pre style="margin: 0;"> <span id="LC2765" class="line" lang="haskell"><span class="n" style="color: #333;">setRecTcMaxBound</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RecTcChecker</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RecTcChecker</span></span>
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2767
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<pre style="margin: 0;">-<span id="LC2767" class="line" lang="haskell"><span class="n" style="color: #333;">setRecTcMaxBound</span> <span class="n" style="color: #333;">new_bound</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RC</span> <span class="n" style="color: #333;"><span class="idiff left">_old_bound</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rec_nts</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">RC</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">new_bound</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">rec_nts</span></span></span>
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<pre style="margin: 0;">+<span id="LC2766" class="line" lang="haskell"><span class="n" style="color: #333;">setRecTcMaxBound</span> <span class="n" style="color: #333;">new_bound</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RC</span> <span class="n" style="color: #333;"><span class="idiff left">tank</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">RC</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">setFuel</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">new_bound</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tank</span></span><span class="p"><span class="idiff right">)</span></span></span>
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2768
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2767
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<pre style="margin: 0;"> <span id="LC2767" class="line" lang="haskell"></span>
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2769
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2768
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<pre style="margin: 0;"> <span id="LC2768" class="line" lang="haskell"><span class="n" style="color: #333;">checkRecTc</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">RecTcChecker</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</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;">RecTcChecker</span></span>
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2770
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2769
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<pre style="margin: 0;"> <span id="LC2769" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Nothing => Recursion detected</span></span>
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2771
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2770
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<pre style="margin: 0;"> <span id="LC2770" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Just rec_tcs => Keep going</span></span>
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2772
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<pre style="margin: 0;">-<span id="LC2772" class="line" lang="haskell"><span class="n" style="color: #333;">checkRecTc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RC</span> <span class="n" style="color: #333;">bound</span> <span class="n" style="color: #333;">rec_nts</span><span class="p">)</span> <span class="n" style="color: #333;">tc</span></span>
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2773
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<pre style="margin: 0;">-<span id="LC2773" 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;">lookupNameEnv</span> <span class="n" style="color: #333;">rec_nts</span> <span class="n" style="color: #333;">tc_name</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2774
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<pre style="margin: 0;">-<span id="LC2774" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">>=</span> <span class="n" style="color: #333;">bound</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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2775
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<pre style="margin: 0;">-<span id="LC2775" 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="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RC</span> <span class="n" style="color: #333;">bound</span> <span class="p">(</span><span class="n" style="color: #333;">extendNameEnv</span> <span class="n" style="color: #333;">rec_nts</span> <span class="n" style="color: #333;">tc_name</span> <span class="p">(</span><span class="n" style="color: #333;">n</span><span class="o" style="font-weight: 600;">+</span><span class="mi" style="color: #099;">1</span><span class="p">)))</span></span>
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2776
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<pre style="margin: 0;">-<span id="LC2776" 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="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RC</span> <span class="n" style="color: #333;">bound</span> <span class="p">(</span><span class="n" style="color: #333;">extendNameEnv</span> <span class="n" style="color: #333;">rec_nts</span> <span class="n" style="color: #333;">tc_name</span> <span class="mi" style="color: #099;">1</span><span class="p">))</span></span>
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2777
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<pre style="margin: 0;">-<span id="LC2777" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2778
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<pre style="margin: 0;">-<span id="LC2778" class="line" lang="haskell"> <span class="n" style="color: #333;">tc_name</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyConName</span> <span class="n" style="color: #333;">tc</span></span>
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2771
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<pre style="margin: 0;">+<span id="LC2771" class="line" lang="haskell"><span class="n" style="color: #333;">checkRecTc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RC</span> <span class="n" style="color: #333;">tank</span><span class="p">)</span> <span class="n" style="color: #333;">tc</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">burnFuel</span> <span class="n" style="color: #333;">tank</span> <span class="n" style="color: #333;">tc</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2772
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<pre style="margin: 0;">+<span id="LC2772" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">OutOfFuel</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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2773
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<pre style="margin: 0;">+<span id="LC2773" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">FuelLeft</span> <span class="n" style="color: #333;">tank'</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;">RC</span> <span class="n" style="color: #333;">tank'</span><span class="p">)</span></span>
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2774
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<pre style="margin: 0;"> <span id="LC2774" class="line" lang="haskell"></span>
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2780
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<pre style="margin: 0;"> <span id="LC2775" class="line" lang="haskell"><span class="cd">-- | Returns whether or not this 'TyCon' is definite, or a hole</span></span>
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2776
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<pre style="margin: 0;"> <span id="LC2776" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- that may be filled in at some later point. See Note [Skolem abstract data]</span></span>
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<li id="cc97d81e7223ad4a3a5e801156ca632f9fa75654">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f1abbd98e5bc41f51e9fab748adbae4608f06ba3#cc97d81e7223ad4a3a5e801156ca632f9fa75654"><strong>compiler/GHC/Hs/Expr.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1347,8 +1347,11 @@ hsExprNeedsParens p = go</td>
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1347
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<pre style="margin: 0;"> <span id="LC1347" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ExpansionExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsExpanded</span> <span class="n" style="color: #333;">a</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">hsExprNeedsParens</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">a</span></span>
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1348
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<pre style="margin: 0;"> <span id="LC1348" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ghcPass</span> <span class="o" style="font-weight: 600;">@</span><span class="n" style="color: #333;">p</span></span>
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1349
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1349
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<pre style="margin: 0;"> <span id="LC1349" 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;">x</span> <span class="kr" style="font-weight: 600;">of</span> <span class="kt" style="color: #458; font-weight: 600;">HsExpanded</span> <span class="n" style="color: #333;">a</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">hsExprNeedsParens</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC1350" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- TODO: Bump to 900</span></span>
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1351
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<pre style="margin: 0;">+<span id="LC1351" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">__GLASGOW_HASKELL__</span> <span class="o" style="font-weight: 600;"><=</span> <span class="mi" style="color: #099;">810</span></span>
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1350
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1352
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<pre style="margin: 0;"> <span id="LC1352" 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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1351
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1353
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<pre style="margin: 0;"> <span id="LC1353" class="line" lang="haskell"> <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="LC1354" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="n" style="color: #333;">endif</span></span>
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1355
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<pre style="margin: 0;"> <span id="LC1355" class="line" lang="haskell"></span>
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1353
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1356
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<pre style="margin: 0;"> <span id="LC1356" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1357" class="line" lang="haskell"><span class="cd">-- | @'parenthesizeHsExpr' p e@ checks if @'hsExprNeedsParens' p e@ is true,</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">@@ -781,28 +781,6 @@ This means we can't just desugar the pattern match to</td>
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<pre style="margin: 0;"> <span id="LC781" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">@[T a b <- x, 'a' <- a, 42 <- b]@. Instead we have to force them in the</span></span>
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<pre style="margin: 0;"> <span id="LC782" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">right order: @[T a b <- x, 42 <- b, 'a' <- a]@.</span></span>
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<pre style="margin: 0;"> <span id="LC783" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC784" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Strict fields and fields of unlifted type]</span></span>
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<pre style="margin: 0;">-<span id="LC785" 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="LC786" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">How do strict fields play into Note [Field match order for RecCon]? Answer:</span></span>
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<pre style="margin: 0;">-<span id="LC787" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">They don't. Desugaring is entirely unconcerned by strict fields; the forcing</span></span>
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<pre style="margin: 0;">-<span id="LC788" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">happens *before* pattern matching. But for each strict (or more generally,</span></span>
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<pre style="margin: 0;">-<span id="LC789" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">unlifted) field @s@ we have to add @s ≁ ⊥@ constraints when we check the PmCon</span></span>
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<pre style="margin: 0;">-<span id="LC790" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">guard in 'checkGrd'. Strict fields are devoid of ⊥ by construction, there's</span></span>
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<pre style="margin: 0;">-<span id="LC791" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">nothing that a bang pattern would act on. Example from #18341:</span></span>
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<pre style="margin: 0;">-<span id="LC792" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC793" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T = MkT !Int</span></span>
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<pre style="margin: 0;">-<span id="LC794" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: T -> ()</span></span>
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<pre style="margin: 0;">-<span id="LC795" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f (MkT _) | False = () -- inaccessible</span></span>
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<pre style="margin: 0;">-<span id="LC796" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f (MkT !_) | False = () -- redundant, not only inaccessible!</span></span>
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<pre style="margin: 0;">-<span id="LC797" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f _ = ()</span></span>
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<pre style="margin: 0;">-<span id="LC798" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC799" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The second clause desugars to @MkT n <- x, !n@. When coverage checked, the</span></span>
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<pre style="margin: 0;">-<span id="LC800" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'PmCon' @MkT n <- x@ refines the set of values that reach the bang pattern with</span></span>
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801
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<pre style="margin: 0;">-<span id="LC801" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the constraints @x ~ MkT n, n ≁ ⊥@ (this list is computed by 'pmConCts').</span></span>
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802
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<pre style="margin: 0;">-<span id="LC802" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Checking the 'PmBang' @!n@ will then try to add the constraint @n ~ ⊥@ to this</span></span>
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<pre style="margin: 0;">-<span id="LC803" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">set to get the diverging set, which is found to be empty. Hence the whole</span></span>
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<pre style="margin: 0;">-<span id="LC804" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">clause is detected as redundant, as expected.</span></span>
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<pre style="margin: 0;">-<span id="LC805" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC784" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Order of guards matters]</span></span>
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<pre style="margin: 0;"> <span id="LC785" 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="LC786" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Similar to Note [Field match order for RecCon], the order in which the guards</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -872,17 +850,17 @@ instance Outputable a => Outputable (CheckResult a) where</td>
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<pre style="margin: 0;"> <span id="LC850" class="line" lang="haskell"> <span class="n" style="color: #333;">field</span> <span class="n" style="color: #333;">name</span> <span class="n" style="color: #333;">value</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">equals</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">value</span></span>
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<pre style="margin: 0;"> <span id="LC851" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC852" class="line" lang="haskell"><span class="cd">-- | Lift 'addPmCts' over 'Nablas'.</span></span>
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<pre style="margin: 0;">-<span id="LC875" class="line" lang="haskell"><span class="n" style="color: #333;">addP<span class="idiff left">mCtsNablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Pm</span>Cts</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Nablas</span></span>
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<pre style="margin: 0;">-<span id="LC876" class="line" lang="haskell"><span class="n" style="color: #333;">addP<span class="idiff left">mCtsNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">nablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">cts</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">liftNablasM</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">\</span></span><span class="n" style="color: #333;"><span class="idiff">d</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">addPm</span>Cts</span> <span class="n" style="color: #333;">d</span> <span class="n" style="color: #333;">cts</span><span class="p">)</span> <span class="n" style="color: #333;">nablas</span></span>
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<pre style="margin: 0;">+<span id="LC853" class="line" lang="haskell"><span class="n" style="color: #333;">addP<span class="idiff left">hiCtsNablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Phi</span>Cts</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Nablas</span></span>
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<pre style="margin: 0;">+<span id="LC854" class="line" lang="haskell"><span class="n" style="color: #333;">addP<span class="idiff left">hiCtsNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">nablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">cts</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">liftNablasM</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">\</span></span><span class="n" style="color: #333;"><span class="idiff">d</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">addPhi</span>Cts</span> <span class="n" style="color: #333;">d</span> <span class="n" style="color: #333;">cts</span><span class="p">)</span> <span class="n" style="color: #333;">nablas</span></span>
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<pre style="margin: 0;"> <span id="LC855" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC856" class="line" lang="haskell"><span class="cd">-- | 'addPmCtsNablas' for a single 'PmCt'.</span></span>
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<pre style="margin: 0;">-<span id="LC879" class="line" lang="haskell"><span class="n" style="color: #333;">addP<span class="idiff left">mCtNablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Pm</span>Ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Nablas</span></span>
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<pre style="margin: 0;">-<span id="LC880" class="line" lang="haskell"><span class="n" style="color: #333;">addP<span class="idiff left">mCtNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">nablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ct</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">addPm</span>CtsNablas</span> <span class="n" style="color: #333;">nablas</span> <span class="p">(</span><span class="n" style="color: #333;">unitBag</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC857" class="line" lang="haskell"><span class="n" style="color: #333;">addP<span class="idiff left">hiCtNablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Phi</span>Ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Nablas</span></span>
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858
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<pre style="margin: 0;">+<span id="LC858" class="line" lang="haskell"><span class="n" style="color: #333;">addP<span class="idiff left">hiCtNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">nablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ct</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">addPhi</span>CtsNablas</span> <span class="n" style="color: #333;">nablas</span> <span class="p">(</span><span class="n" style="color: #333;">unitBag</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span></span>
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881
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859
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<pre style="margin: 0;"> <span id="LC859" class="line" lang="haskell"></span>
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882
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<pre style="margin: 0;"> <span id="LC860" class="line" lang="haskell"><span class="cd">-- | Test if any of the 'Nabla's is inhabited. Currently this is pure, because</span></span>
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883
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861
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<pre style="margin: 0;"> <span id="LC861" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- we preserve the invariant that there are no uninhabited 'Nabla's. But that</span></span>
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884
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862
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<pre style="margin: 0;"> <span id="LC862" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- could change in the future, for example by implementing this function in</span></span>
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885
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<pre style="margin: 0;">-<span id="LC885" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- terms of @notNull <$> <span class="idiff left right">provideEvidence</span> 1 ds@.</span></span>
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863
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<pre style="margin: 0;">+<span id="LC863" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- terms of @notNull <$> <span class="idiff left right">generateInhabitants</span> 1 ds@.</span></span>
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886
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864
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<pre style="margin: 0;"> <span id="LC864" class="line" lang="haskell"><span class="n" style="color: #333;">isInhabited</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nablas</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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887
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865
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<pre style="margin: 0;"> <span id="LC865" class="line" lang="haskell"><span class="n" style="color: #333;">isInhabited</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MkNablas</span> <span class="n" style="color: #333;">ds</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">ds</span><span class="p">))</span></span>
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888
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866
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<pre style="margin: 0;"> <span id="LC866" 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">@@ -938,26 +916,6 @@ throttle limit old@(MkNablas old_ds) new@(MkNablas new_ds)</td>
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938
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916
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<pre style="margin: 0;"> <span id="LC916" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">new_ds</span> <span class="o" style="font-weight: 600;">></span> <span class="n" style="color: #333;">max</span> <span class="n" style="color: #333;">limit</span> <span class="p">(</span><span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">old_ds</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;">Approximate</span><span class="p">,</span> <span class="n" style="color: #333;">old</span><span class="p">)</span></span>
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939
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917
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<pre style="margin: 0;"> <span id="LC917" 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="kt" style="color: #458; font-weight: 600;">Precise</span><span class="p">,</span> <span class="n" style="color: #333;">new</span><span class="p">)</span></span>
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940
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918
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<pre style="margin: 0;"> <span id="LC918" class="line" lang="haskell"></span>
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941
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<pre style="margin: 0;">-<span id="LC941" class="line" lang="haskell"><span class="cd">-- | The 'PmCts' arising from a successful 'PmCon' match @T gammas as ys <- x@.</span></span>
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942
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<pre style="margin: 0;">-<span id="LC942" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- These include</span></span>
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943
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<pre style="margin: 0;">-<span id="LC943" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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944
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<pre style="margin: 0;">-<span id="LC944" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * @gammas@: Constraints arising from the bound evidence vars</span></span>
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945
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<pre style="margin: 0;">-<span id="LC945" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * @y ≁ ⊥@ constraints for each unlifted field (including strict fields)</span></span>
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946
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<pre style="margin: 0;">-<span id="LC946" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @y@ in @ys@</span></span>
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947
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<pre style="margin: 0;">-<span id="LC947" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * The constructor constraint itself: @x ~ T as ys@.</span></span>
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<pre style="margin: 0;">-<span id="LC948" 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="LC949" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Strict fields and fields of unlifted type].</span></span>
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<pre style="margin: 0;">-<span id="LC950" class="line" lang="haskell"><span class="n" style="color: #333;">pmConCts</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="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</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;">EvVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmCts</span></span>
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951
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<pre style="margin: 0;">-<span id="LC951" class="line" lang="haskell"><span class="n" style="color: #333;">pmConCts</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">dicts</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">gammas</span> <span class="p">`</span><span class="n" style="color: #333;">unionBags</span><span class="p">`</span> <span class="n" style="color: #333;">unlifted</span> <span class="p">`</span><span class="n" style="color: #333;">snocBag</span><span class="p">`</span> <span class="n" style="color: #333;">con_ct</span></span>
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952
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<pre style="margin: 0;">-<span id="LC952" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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953
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<pre style="margin: 0;">-<span id="LC953" class="line" lang="haskell"> <span class="n" style="color: #333;">gammas</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">listToBag</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmTyCt</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">evVarPred</span><span class="p">)</span> <span class="n" style="color: #333;">dicts</span></span>
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954
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<pre style="margin: 0;">-<span id="LC954" class="line" lang="haskell"> <span class="n" style="color: #333;">con_ct</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PmConCt</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">args</span></span>
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955
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<pre style="margin: 0;">-<span id="LC955" class="line" lang="haskell"> <span class="n" style="color: #333;">unlifted</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">listToBag</span> <span class="p">[</span> <span class="kt" style="color: #458; font-weight: 600;">PmNotBotCt</span> <span class="n" style="color: #333;">arg</span></span>
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956
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<pre style="margin: 0;">-<span id="LC956" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">arg</span><span class="p">,</span> <span class="n" style="color: #333;">bang</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span></span>
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<pre style="margin: 0;">-<span id="LC957" class="line" lang="haskell"> <span class="n" style="color: #333;">zipEqual</span> <span class="s" style="color: #d14;">"pmConCts"</span> <span class="n" style="color: #333;">args</span> <span class="p">(</span><span class="n" style="color: #333;">pmAltConImplBangs</span> <span class="n" style="color: #333;">con</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC958" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">isBanged</span> <span class="n" style="color: #333;">bang</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">isUnliftedType</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">arg</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC959" class="line" lang="haskell"> <span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC960" class="line" lang="haskell"></span>
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961
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919
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<pre style="margin: 0;"> <span id="LC919" class="line" lang="haskell"><span class="n" style="color: #333;">checkSequence</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="n" style="color: #333;">grdtree</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CheckAction</span> <span class="n" style="color: #333;">anntree</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span> <span class="n" style="color: #333;">grdtree</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CheckAction</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span> <span class="n" style="color: #333;">anntree</span><span class="p">)</span></span>
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962
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<pre style="margin: 0;"> <span id="LC920" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The implementation is pretty similar to</span></span>
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<pre style="margin: 0;"> <span id="LC921" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @traverse1 :: Apply f => (a -> f b) -> NonEmpty a -> f (NonEmpty b)@</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -969,32 +927,32 @@ checkGrd :: PmGrd -> CheckAction RedSets</td>
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<pre style="margin: 0;"> <span id="LC927" class="line" lang="haskell"><span class="n" style="color: #333;">checkGrd</span> <span class="n" style="color: #333;">grd</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CA</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">inc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">grd</span> <span class="kr" style="font-weight: 600;">of</span></span>
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970
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928
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<pre style="margin: 0;"> <span id="LC928" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- let x = e: Refine with x ~ e</span></span>
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971
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929
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<pre style="margin: 0;"> <span id="LC929" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmLet</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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972
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<pre style="margin: 0;">-<span id="LC972" class="line" lang="haskell"> <span class="n" style="color: #333;">matched</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addP<span class="idiff left">mCtNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inc</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Pm</span>CoreCt</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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973
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<pre style="margin: 0;">-<span id="LC973" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">-- </span>tracePm "check:Let" (ppr x <+> char '=' <+> ppr e)</span></span>
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930
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<pre style="margin: 0;">+<span id="LC930" class="line" lang="haskell"> <span class="n" style="color: #333;">matched</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addP<span class="idiff left">hiCtNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inc</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Phi</span>CoreCt</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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931
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<pre style="margin: 0;">+<span id="LC931" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"check:Let"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">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;">e</span><span class="p">)</span></span>
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974
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932
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<pre style="margin: 0;"> <span id="LC932" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">CheckResult</span> <span class="p">{</span> <span class="n" style="color: #333;">cr_ret</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyRedSets</span> <span class="p">{</span> <span class="n" style="color: #333;">rs_cov</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">matched</span> <span class="p">}</span></span>
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975
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933
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<pre style="margin: 0;"> <span id="LC933" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cr_uncov</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mempty</span></span>
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976
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934
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<pre style="margin: 0;"> <span id="LC934" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cr_approx</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Precise</span> <span class="p">}</span></span>
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977
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<td class="diff-line-num new_line" data-linenumber="935" 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">
935
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<pre style="margin: 0;"> <span id="LC935" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Bang x _: Diverge on x ~ ⊥, refine with x ≁ ⊥</span></span>
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978
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936
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<pre style="margin: 0;"> <span id="LC936" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmBang</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">mb_info</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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979
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<pre style="margin: 0;">-<span id="LC979" class="line" lang="haskell"> <span class="n" style="color: #333;">div</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addP<span class="idiff left">mCtNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inc</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Pm</span>BotCt</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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980
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<pre style="margin: 0;">-<span id="LC980" class="line" lang="haskell"> <span class="n" style="color: #333;">matched</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addP<span class="idiff left">mCtNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inc</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Pm</span>NotBotCt</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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937
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<pre style="margin: 0;">+<span id="LC937" class="line" lang="haskell"> <span class="n" style="color: #333;">div</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addP<span class="idiff left">hiCtNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inc</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Phi</span>BotCt</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="938" 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">
938
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<pre style="margin: 0;">+<span id="LC938" class="line" lang="haskell"> <span class="n" style="color: #333;">matched</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addP<span class="idiff left">hiCtNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inc</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Phi</span>NotBotCt</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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981
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939
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<pre style="margin: 0;"> <span id="LC939" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Dead bang patterns]</span></span>
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982
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940
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<pre style="margin: 0;"> <span id="LC940" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- mb_info = Just info <==> PmBang originates from bang pattern in source</span></span>
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983
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<td class="diff-line-num new_line" data-linenumber="941" 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">
941
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<pre style="margin: 0;"> <span id="LC941" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">bangs</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">info</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mb_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unitOL</span> <span class="p">(</span><span class="n" style="color: #333;">div</span><span class="p">,</span> <span class="n" style="color: #333;">info</span><span class="p">)</span></span>
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984
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<td class="diff-line-num new_line" data-linenumber="942" 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">
942
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<pre style="margin: 0;"> <span id="LC942" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NilOL</span></span>
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985
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<pre style="margin: 0;">-<span id="LC985" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">-- </span>tracePm "check:Bang" (ppr x <+> ppr div)</span></span>
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943
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<pre style="margin: 0;">+<span id="LC943" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"check:Bang"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">div</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC944" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">CheckResult</span> <span class="p">{</span> <span class="n" style="color: #333;">cr_ret</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">RedSets</span> <span class="p">{</span> <span class="n" style="color: #333;">rs_cov</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">matched</span><span class="p">,</span> <span class="n" style="color: #333;">rs_div</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">div</span><span class="p">,</span> <span class="n" style="color: #333;">rs_bangs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bangs</span> <span class="p">}</span></span>
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987
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945
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<pre style="margin: 0;"> <span id="LC945" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cr_uncov</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mempty</span></span>
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988
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946
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<pre style="margin: 0;"> <span id="LC946" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cr_approx</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Precise</span> <span class="p">}</span></span>
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989
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947
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<pre style="margin: 0;"> <span id="LC947" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Con: Fall through on x ≁ K and refine with x ~ K ys and type info</span></span>
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990
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948
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<pre style="margin: 0;"> <span id="LC948" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmCon</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">dicts</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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991
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949
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<pre style="margin: 0;"> <span id="LC949" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">div</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">isPmAltConMatchStrict</span> <span class="n" style="color: #333;">con</span></span>
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992
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<pre style="margin: 0;">-<span id="LC992" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">addP<span class="idiff left">mCtNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inc</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Pm</span>BotCt</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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950
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<pre style="margin: 0;">+<span id="LC950" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">addP<span class="idiff left">hiCtNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inc</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Phi</span>BotCt</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC951" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">mempty</span></span>
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<pre style="margin: 0;">-<span id="LC994" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;"><span class="idiff left">let</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">con_cts</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">pmConCts</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">con</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tvs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">dicts</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">args</span></span></span>
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<pre style="margin: 0;">-<span id="LC995" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">matched</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addP<span class="idiff left">mCtsNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inc</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">con_cts</span></span></span>
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<pre style="margin: 0;">-<span id="LC996" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">uncov</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addP<span class="idiff left">mCtNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inc</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Pm</span>NotConCt</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC997" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">-- tracePm "checkGrd:Con" (ppr inc $$ ppr grd $$ ppr con_cts</span> $$ ppr matched)</span></span>
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<pre style="margin: 0;">+<span id="LC952" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">tracePm</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"checkGrd:Con1"</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inc</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$$</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">div</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC953" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">matched</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addP<span class="idiff left">hiCtNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inc</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">PhiConCt</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">con</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tvs</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">map</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">evVarPred</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">dicts</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">args</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC954" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">uncov</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addP<span class="idiff left">hiCtNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inc</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Phi</span>NotConCt</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC955" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">tracePm</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"checkGrd:Con2"</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inc</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$$</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">grd</span></span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">matched</span><span class="p">)</span></span>
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998
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956
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<pre style="margin: 0;"> <span id="LC956" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">CheckResult</span> <span class="p">{</span> <span class="n" style="color: #333;">cr_ret</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyRedSets</span> <span class="p">{</span> <span class="n" style="color: #333;">rs_cov</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">matched</span><span class="p">,</span> <span class="n" style="color: #333;">rs_div</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">div</span> <span class="p">}</span></span>
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999
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957
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<pre style="margin: 0;"> <span id="LC957" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cr_uncov</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">uncov</span></span>
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1000
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958
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<pre style="margin: 0;"> <span id="LC958" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cr_approx</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Precise</span> <span class="p">}</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="986" 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">@@ -1028,7 +986,7 @@ checkGRHS (PmGRHS { pg_grds = grds, pg_rhs = rhs_info }) =</td>
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1028
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986
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<pre style="margin: 0;"> <span id="LC986" class="line" lang="haskell"></span>
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1029
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987
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<pre style="margin: 0;"> <span id="LC987" class="line" lang="haskell"><span class="n" style="color: #333;">checkEmptyCase</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmEmptyCase</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CheckAction</span> <span class="kt" style="color: #458; font-weight: 600;">PmEmptyCase</span></span>
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1030
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988
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<pre style="margin: 0;"> <span id="LC988" class="line" lang="haskell"><span class="n" style="color: #333;">checkEmptyCase</span> <span class="n" style="color: #333;">pe</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmEmptyCase</span> <span class="p">{</span> <span class="n" style="color: #333;">pe_var</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">var</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CA</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">inc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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1031
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<pre style="margin: 0;">-<span id="LC1031" class="line" lang="haskell"> <span class="n" style="color: #333;">unc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addP<span class="idiff left">mCtNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inc</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Pm</span>NotBotCt</span> <span class="n" style="color: #333;">var</span><span class="p">)</span></span>
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989
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<pre style="margin: 0;">+<span id="LC989" class="line" lang="haskell"> <span class="n" style="color: #333;">unc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addP<span class="idiff left">hiCtNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inc</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Phi</span>NotBotCt</span> <span class="n" style="color: #333;">var</span><span class="p">)</span></span>
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1032
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990
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<pre style="margin: 0;"> <span id="LC990" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">CheckResult</span> <span class="p">{</span> <span class="n" style="color: #333;">cr_ret</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pe</span><span class="p">,</span> <span class="n" style="color: #333;">cr_uncov</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unc</span><span class="p">,</span> <span class="n" style="color: #333;">cr_approx</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mempty</span> <span class="p">}</span></span>
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1033
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991
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<pre style="margin: 0;"> <span id="LC991" class="line" lang="haskell"></span>
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1034
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992
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<pre style="margin: 0;"> <span id="LC992" class="line" lang="haskell"><span class="n" style="color: #333;">checkPatBind</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmPatBind</span> <span class="kt" style="color: #458; font-weight: 600;">Pre</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CheckAction</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmPatBind</span> <span class="kt" style="color: #458; font-weight: 600;">Post</span><span class="p">)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1275,7 +1233,7 @@ getNFirstUncovered vars n (MkNablas nablas) = go n (bagToList nablas)</td>
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1275
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1233
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<pre style="margin: 0;"> <span id="LC1233" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="mi" style="color: #099;">0</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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1276
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1234
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<pre style="margin: 0;"> <span id="LC1234" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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1277
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1235
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<pre style="margin: 0;"> <span id="LC1235" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n</span> <span class="p">(</span><span class="n" style="color: #333;">nabla</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">nablas</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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1278
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<pre style="margin: 0;">-<span id="LC1278" class="line" lang="haskell"> <span class="n" style="color: #333;">front</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;"><span class="idiff left right">provideEvidence</span></span> <span class="n" style="color: #333;">vars</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">nabla</span></span>
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1236
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<pre style="margin: 0;">+<span id="LC1236" class="line" lang="haskell"> <span class="n" style="color: #333;">front</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;"><span class="idiff left right">generateInhabitants</span></span> <span class="n" style="color: #333;">vars</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">nabla</span></span>
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1279
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1237
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<pre style="margin: 0;"> <span id="LC1237" class="line" lang="haskell"> <span class="n" style="color: #333;">back</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">-</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">front</span><span class="p">)</span> <span class="n" style="color: #333;">nablas</span></span>
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1280
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1238
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<pre style="margin: 0;"> <span id="LC1238" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">front</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">back</span><span class="p">)</span></span>
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1281
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1239
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<pre style="margin: 0;"> <span id="LC1239" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1415" 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="1373" 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">@@ -1415,7 +1373,8 @@ addTyCs :: Origin -> Bag EvVar -> DsM a -> DsM a</td>
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1415
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1373
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<pre style="margin: 0;"> <span id="LC1373" class="line" lang="haskell"><span class="n" style="color: #333;">addTyCs</span> <span class="n" style="color: #333;">origin</span> <span class="n" style="color: #333;">ev_vars</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1416
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1374
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<pre style="margin: 0;"> <span id="LC1374" class="line" lang="haskell"> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getDynFlags</span></span>
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1417
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1375
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<pre style="margin: 0;"> <span id="LC1375" class="line" lang="haskell"> <span class="n" style="color: #333;">applyWhen</span> <span class="p">(</span><span class="n" style="color: #333;">needToRunPmCheck</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">origin</span><span class="p">)</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1418" 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">
1418
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<pre style="margin: 0;">-<span id="LC1418" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">locallyExtendPmNablas</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">nablas</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addPmCtsNablas</span> <span class="n" style="color: #333;">nablas</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmTyCt</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">evVarPred</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">ev_vars</span><span class="p">)))</span></span>
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1376
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<pre style="margin: 0;">+<span id="LC1376" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">locallyExtendPmNablas</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">nablas</span> <span class="o" style="font-weight: 600;">-></span></span>
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1377
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<pre style="margin: 0;">+<span id="LC1377" class="line" lang="haskell"> <span class="n" style="color: #333;">addPhiCtsNablas</span> <span class="n" style="color: #333;">nablas</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PhiTyCt</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">evVarPred</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">ev_vars</span><span class="p">))</span></span>
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1419
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1378
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<pre style="margin: 0;"> <span id="LC1378" class="line" lang="haskell"> <span class="n" style="color: #333;">m</span></span>
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1420
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1379
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<pre style="margin: 0;"> <span id="LC1379" class="line" lang="haskell"></span>
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1421
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1380
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<pre style="margin: 0;"> <span id="LC1380" class="line" lang="haskell"><span class="cd">-- | Add equalities for the 'CoreExpr' scrutinee to the local 'DsM' environment</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1427" 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="1386" 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">@@ -1427,7 +1386,7 @@ addCoreScrutTmCs :: Maybe CoreExpr -> [Id] -> DsM a -> DsM a</td>
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1427
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1386
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<pre style="margin: 0;"> <span id="LC1386" class="line" lang="haskell"><span class="n" style="color: #333;">addCoreScrutTmCs</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">k</span></span>
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1428
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1387
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<pre style="margin: 0;"> <span id="LC1387" class="line" lang="haskell"><span class="n" style="color: #333;">addCoreScrutTmCs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">scr</span><span class="p">)</span> <span class="p">[</span><span class="n" style="color: #333;">x</span><span class="p">]</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">=</span></span>
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1429
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1388
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<pre style="margin: 0;"> <span id="LC1388" class="line" lang="haskell"> <span class="n" style="color: #333;">flip</span> <span class="n" style="color: #333;">locallyExtendPmNablas</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">nablas</span> <span class="o" style="font-weight: 600;">-></span></span>
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1430
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<pre style="margin: 0;">-<span id="LC1430" class="line" lang="haskell"> <span class="n" style="color: #333;">addP<span class="idiff left">mCtsNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">nablas</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">unitBag</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Pm</span>CoreCt</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">scr</span><span class="p">))</span></span>
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1389
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<pre style="margin: 0;">+<span id="LC1389" class="line" lang="haskell"> <span class="n" style="color: #333;">addP<span class="idiff left">hiCtsNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">nablas</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">unitBag</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Phi</span>CoreCt</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">scr</span><span class="p">))</span></span>
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1431
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1390
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<pre style="margin: 0;"> <span id="LC1390" class="line" lang="haskell"><span class="n" style="color: #333;">addCoreScrutTmCs</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"addCoreScrutTmCs: scrutinee, but more than one match id"</span></span>
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<pre style="margin: 0;"> <span id="LC1391" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1392" class="line" lang="haskell"><span class="cd">-- | 'addCoreScrutTmCs', but desugars the 'LHsExpr' first.</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f1abbd98e5bc41f51e9fab748adbae4608f06ba3#8d8e5922fde8bc19ffa2bc9cae6b6720abb88564"><strong>compiler/GHC/HsToCore/PmCheck/Oracle.hs</strong></a>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f1abbd98e5bc41f51e9fab748adbae4608f06ba3#16160f179df308e914fffee87ce52c9a048bde89"><strong>compiler/GHC/HsToCore/PmCheck/Ppr.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">@@ -146,8 +146,8 @@ pprPmVar :: PprPrec -> Id -> PmPprM SDoc</td>
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<pre style="margin: 0;"> <span id="LC146" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmVar</span> <span class="n" style="color: #333;">prec</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="LC147" class="line" lang="haskell"> <span class="n" style="color: #333;">nabla</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ask</span></span>
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148
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<pre style="margin: 0;"> <span id="LC148" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lookupSolution</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">x</span> <span class="kr" style="font-weight: 600;">of</span></span>
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149
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<pre style="margin: 0;">-<span id="LC149" 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;"><span class="idiff left">alt</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">_tvs</span></span><span class="p"><span class="idiff right">,</span></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;">pprPmAltCon</span> <span class="n" style="color: #333;">prec</span> <span class="n" style="color: #333;">alt</span> <span class="n" style="color: #333;">args</span></span>
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150
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<pre style="margin: 0;">-<span id="LC150" 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;">fromMaybe</span> <span class="n" style="color: #333;">typed_wildcard</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">checkRefuts</span> <span class="n" style="color: #333;">x</span></span>
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149
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<pre style="margin: 0;">+<span id="LC149" 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;"><span class="idiff left">PACA</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">alt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">_tvs</span></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;">pprPmAltCon</span> <span class="n" style="color: #333;">prec</span> <span class="n" style="color: #333;">alt</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">+<span id="LC150" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">fromMaybe</span> <span class="n" style="color: #333;">typed_wildcard</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">checkRefuts</span> <span class="n" style="color: #333;">x</span></span>
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151
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<pre style="margin: 0;"> <span id="LC151" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</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;">-- if we have no info about the parameter and would just print a</span></span>
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<pre style="margin: 0;"> <span id="LC153" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- wildcard, also show its type.</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">@@ -206,7 +206,7 @@ pmExprAsList :: Nabla -> PmAltCon -> [Id] -> Maybe PmExprList</td>
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<pre style="margin: 0;"> <span id="LC206" class="line" lang="haskell"><span class="n" style="color: #333;">pmExprAsList</span> <span class="n" style="color: #333;">nabla</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go_con</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;"> <span id="LC207" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC208" class="line" lang="haskell"> <span class="n" style="color: #333;">go_var</span> <span class="n" style="color: #333;">rev_pref</span> <span class="n" style="color: #333;">x</span></span>
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209
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<pre style="margin: 0;">-<span id="LC209" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">alt</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">_tvs</span></span><span class="p"><span class="idiff right">,</span></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;">lookupSolution</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">x</span></span>
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209
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<pre style="margin: 0;">+<span id="LC209" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">PACA</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">alt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">_tvs</span></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;">lookupSolution</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">x</span></span>
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210
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<pre style="margin: 0;"> <span id="LC210" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go_con</span> <span class="n" style="color: #333;">rev_pref</span> <span class="n" style="color: #333;">alt</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;"> <span id="LC211" class="line" lang="haskell"> <span class="n" style="color: #333;">go_var</span> <span class="n" style="color: #333;">rev_pref</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;"> <span id="LC212" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">pref</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">nonEmpty</span> <span class="p">(</span><span class="n" style="color: #333;">reverse</span> <span class="n" style="color: #333;">rev_pref</span><span class="p">)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f1abbd98e5bc41f51e9fab748adbae4608f06ba3#a90b29966ba2a86c0f6927651648cb062f00ea03"><strong>compiler/GHC/HsToCore/PmCheck/Types.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -33,11 +33,11 @@ module GHC.HsToCore.PmCheck.Types (</td>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * A 'DIdEnv' where entries may be shared</span></span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Shared</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;">SharedDIdEnv</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">emptySDIE</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lookupSDIE</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">sameRepresentativeSDIE</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC36" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">setIndirectSDIE</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">setEntrySDIE</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">traverseSDIE</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">setIndirectSDIE</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">setEntrySDIE</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">traverseSDIE</span><span class="p">,</span><span class="idiff left"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">entriesSDIE</span></span><span class="p"><span class="idiff right">,</span></span></span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * The pattern match oracle</span></span>
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<pre style="margin: 0;">-<span id="LC39" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">BotInfo</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;"><span class="idiff left">VarInfo</span></span><span class="p"><span class="idiff">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">..</span></span><span class="p"><span class="idiff">),</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TmState</span></span><span class="p"><span class="idiff">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">..</span></span><span class="p"><span class="idiff">),</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TyState</span></span><span class="p"><span class="idiff">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">..</span></span><span class="p"><span class="idiff">),</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nabla</span></span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span></span>
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<pre style="margin: 0;">-<span id="LC40" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nablas</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">initNablas</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">liftNablasM</span></span>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">BotInfo</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;"><span class="idiff left">PmAltConApp</span></span><span class="p"><span class="idiff">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">..</span></span><span class="p"><span class="idiff">),</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">VarInfo</span></span><span class="p"><span class="idiff">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">..</span></span><span class="p"><span class="idiff">),</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TmState</span></span><span class="p"><span class="idiff">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">..</span></span><span class="p"><span class="idiff">),</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">TyState</span></span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span></span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span><span class="p"><span class="idiff left">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">..</span></span><span class="p"><span class="idiff">),</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nabla</span>s</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">initNablas</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">liftNablasM</span></span>
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<pre style="margin: 0;"> <span id="LC41" 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="LC42" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC43" 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">@@ -49,6 +49,7 @@ import GHC.Data.Bag</td>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.FastString</span></span>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Id</span></span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var.Env</span></span>
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<pre style="margin: 0;">+<span id="LC52" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var.Set</span></span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Unique.DSet</span></span>
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Unique.DFM</span></span>
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Name</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -485,6 +486,12 @@ setEntrySDIE :: SharedDIdEnv a -> Id -> a -> SharedDIdEnv a</td>
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<pre style="margin: 0;"> <span id="LC486" class="line" lang="haskell"><span class="n" style="color: #333;">setEntrySDIE</span> <span class="n" style="color: #333;">sdie</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SDIE</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;"> <span id="LC487" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SDIE</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">extendDVarEnv</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="n" style="color: #333;">fst</span> <span class="p">(</span><span class="n" style="color: #333;">lookupReprAndEntrySDIE</span> <span class="n" style="color: #333;">sdie</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;">Entry</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC488" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC489" class="line" lang="haskell"><span class="n" style="color: #333;">entriesSDIE</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SharedDIdEnv</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>
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<pre style="margin: 0;">+<span id="LC490" class="line" lang="haskell"><span class="n" style="color: #333;">entriesSDIE</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SDIE</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapMaybe</span> <span class="n" style="color: #333;">preview_entry</span> <span class="p">(</span><span class="n" style="color: #333;">eltsUDFM</span> <span class="n" style="color: #333;">env</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC491" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC492" class="line" lang="haskell"> <span class="n" style="color: #333;">preview_entry</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Entry</span> <span class="n" style="color: #333;">e</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;">e</span></span>
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<pre style="margin: 0;">+<span id="LC493" class="line" lang="haskell"> <span class="n" style="color: #333;">preview_entry</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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<pre style="margin: 0;">+<span id="LC494" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC495" class="line" lang="haskell"><span class="n" style="color: #333;">traverseSDIE</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span> <span class="n" style="color: #333;">f</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">Applicative</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">=></span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">f</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;">SharedDIdEnv</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SharedDIdEnv</span> <span class="n" style="color: #333;">b</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC496" class="line" lang="haskell"><span class="n" style="color: #333;">traverseSDIE</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fmap</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SDIE</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">listToUDFM_Directly</span><span class="p">)</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">traverse</span> <span class="n" style="color: #333;">g</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">udfmToList</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">unSDIE</span></span>
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<pre style="margin: 0;"> <span id="LC497" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</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">@@ -501,13 +508,6 @@ instance Outputable a => Outputable (Shared a) where</td>
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<pre style="margin: 0;"> <span id="LC508" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SharedDIdEnv</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC509" 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;">SDIE</span> <span class="n" style="color: #333;">env</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;">env</span></span>
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<pre style="margin: 0;"> <span id="LC510" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC504" class="line" lang="haskell"><span class="cd">-- | See 'vi_bot'.</span></span>
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<pre style="margin: 0;">-<span id="LC505" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">BotInfo</span></span>
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<pre style="margin: 0;">-<span id="LC506" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IsBot</span></span>
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<pre style="margin: 0;">-<span id="LC507" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">IsNotBot</span></span>
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<pre style="margin: 0;">-<span id="LC508" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeBot</span></span>
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<pre style="margin: 0;">-<span id="LC509" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span></span>
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<pre style="margin: 0;">-<span id="LC510" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC511" class="line" lang="haskell"><span class="cd">-- | The term oracle state. Stores 'VarInfo' for encountered 'Id's. These</span></span>
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<pre style="margin: 0;"> <span id="LC512" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- entries are possibly shared when we figure out that two variables must be</span></span>
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<pre style="margin: 0;"> <span id="LC513" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- equal, thus represent the same set of values.</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">@@ -522,6 +522,9 @@ data TmState</td>
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<pre style="margin: 0;"> <span id="LC522" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ An environment for looking up whether we already encountered semantically</span></span>
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<pre style="margin: 0;"> <span id="LC523" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- equivalent expressions that we want to represent by the same 'Id'</span></span>
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<pre style="margin: 0;"> <span id="LC524" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- representative.</span></span>
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<pre style="margin: 0;">+<span id="LC525" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ts_dirty</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;">DIdSet</span></span>
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<pre style="margin: 0;">+<span id="LC526" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Which 'VarInfo' needs to be checked for inhabitants because of new</span></span>
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<pre style="margin: 0;">+<span id="LC527" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- negative constraints (e.g. @x ≁ ⊥@ or @x ≁ K@).</span></span>
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<pre style="margin: 0;"> <span id="LC528" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC529" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC530" class="line" lang="haskell"><span class="cd">-- | Information about an 'Id'. Stores positive ('vi_pos') facts, like @x ~ Just 42@,</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">@@ -532,11 +535,11 @@ data TmState</td>
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<pre style="margin: 0;"> <span id="LC535" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Subject to Note [The Pos/Neg invariant] in "GHC.HsToCore.PmCheck.Oracle".</span></span>
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<pre style="margin: 0;"> <span id="LC536" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">VarInfo</span></span>
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<pre style="margin: 0;"> <span id="LC537" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">VI</span></span>
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<pre style="margin: 0;">-<span id="LC535" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">vi_<span class="idiff left">ty</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">!</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Type</span></span></span>
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<pre style="margin: 0;">-<span id="LC536" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ The <span class="idiff left right">type of the variable. Important for rejecting possible GADT</span></span></span>
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<pre style="margin: 0;">-<span id="LC537" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">constructors or incompatible pattern synonyms (@Just42 :: Maybe Int@)</span>.</span></span>
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<pre style="margin: 0;">+<span id="LC538" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">vi_<span class="idiff left">id</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">!</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Id</span></span></span>
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<pre style="margin: 0;">+<span id="LC539" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ The <span class="idiff left right">'Id' in question. Important for adding new constraints relative to</span></span></span>
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<pre style="margin: 0;">+<span id="LC540" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">this 'VarInfo' when we don't easily have the 'Id' available</span>.</span></span>
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<pre style="margin: 0;"> <span id="LC541" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC539" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">vi_pos</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="p">[<span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">PmAltCon</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">TyVar</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">Id</span></span><span class="p"><span class="idiff right">])</span>]</span></span>
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<pre style="margin: 0;">+<span id="LC542" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">vi_pos</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;"><span class="idiff left right">PmAltConApp</span></span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC543" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Positive info: 'PmAltCon' apps it is (i.e. @x ~ [Just y, PatSyn z]@), all</span></span>
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<pre style="margin: 0;"> <span id="LC544" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- at the same time (i.e. conjunctive). We need a list because of nested</span></span>
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<pre style="margin: 0;"> <span id="LC545" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- pattern matches involving pattern synonym</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">@@ -576,6 +579,24 @@ data VarInfo</td>
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<pre style="margin: 0;"> <span id="LC579" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to recognise completion of a COMPLETE set efficiently for large enums.</span></span>
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<pre style="margin: 0;"> <span id="LC580" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC581" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC582" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">PmAltConApp</span></span>
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<pre style="margin: 0;">+<span id="LC583" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PACA</span></span>
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<pre style="margin: 0;">+<span id="LC584" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">paca_con</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;">PmAltCon</span></span>
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<pre style="margin: 0;">+<span id="LC585" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">paca_tvs</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;">TyVar</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC586" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">paca_ids</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;">Id</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC587" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC589" class="line" lang="haskell"><span class="cd">-- | See 'vi_bot'.</span></span>
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<pre style="margin: 0;">+<span id="LC590" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">BotInfo</span></span>
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<pre style="margin: 0;">+<span id="LC591" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IsBot</span></span>
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<pre style="margin: 0;">+<span id="LC592" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">IsNotBot</span></span>
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<pre style="margin: 0;">+<span id="LC593" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeBot</span></span>
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<pre style="margin: 0;">+<span id="LC594" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span></span>
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<pre style="margin: 0;">+<span id="LC595" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC596" 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;">PmAltConApp</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC597" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">PACA</span><span class="p">{</span><span class="n" style="color: #333;">paca_con</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">con</span><span class="p">,</span> <span class="n" style="color: #333;">paca_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tvs</span><span class="p">,</span> <span class="n" style="color: #333;">paca_ids</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ids</span><span class="p">}</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC598" class="line" lang="haskell"> <span class="n" style="color: #333;">hsep</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">con</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;">char</span> <span class="sc" style="color: #d14;">'@'</span> <span class="o" style="font-weight: 600;"><></span><span class="p">)</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">ppr</span><span class="p">)</span> <span class="n" style="color: #333;">tvs</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;">ids</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC599" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC600" 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;">BotInfo</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC601" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeBot</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">empty</span></span>
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602
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<pre style="margin: 0;"> <span id="LC602" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">IsBot</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"~⊥"</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -583,33 +604,45 @@ instance Outputable BotInfo where</td>
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604
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<pre style="margin: 0;"> <span id="LC604" class="line" lang="haskell"></span>
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584
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605
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<pre style="margin: 0;"> <span id="LC605" class="line" lang="haskell"><span class="cd">-- | Not user-facing.</span></span>
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606
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<pre style="margin: 0;"> <span id="LC606" 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;">TmState</span> <span class="kr" style="font-weight: 600;">where</span></span>
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586
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<pre style="margin: 0;">-<span id="LC586" 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;">TmSt</span> <span class="n" style="color: #333;">state</span> <span class="n" style="color: #333;">reps</span><span class="p"><span class="idiff left">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">state</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$$</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">reps</span></span></span>
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<pre style="margin: 0;">+<span id="LC607" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="n" style="color: #333;">state</span> <span class="n" style="color: #333;">reps</span><span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff">dirty</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">state</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$$</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">reps</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$$</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">dirty</span></span></span>
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608
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<pre style="margin: 0;"> <span id="LC608" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC609" class="line" lang="haskell"><span class="cd">-- | Not user-facing.</span></span>
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589
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610
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<pre style="margin: 0;"> <span id="LC610" 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;">VarInfo</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC590" 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;">VI</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">pos</span> <span class="n" style="color: #333;">neg</span> <span class="n" style="color: #333;">bot</span> <span class="n" style="color: #333;">cache</span><span class="p">)</span></span>
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591
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<pre style="margin: 0;">-<span id="LC591" 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;">hcat</span> <span class="p">(</span><span class="n" style="color: #333;">punctuate</span> <span class="n" style="color: #333;">comma</span> <span class="p">[</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">pos</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">neg</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">bot</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cache</span><span class="p">]))</span></span>
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611
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<pre style="margin: 0;">+<span id="LC611" 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;">VI</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">pos</span> <span class="n" style="color: #333;">neg</span> <span class="n" style="color: #333;">bot</span> <span class="n" style="color: #333;">cache</span><span class="p">)</span></span>
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612
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<pre style="margin: 0;">+<span id="LC612" 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;">hcat</span> <span class="p">(</span><span class="n" style="color: #333;">punctuate</span> <span class="n" style="color: #333;">comma</span> <span class="p">[</span><span class="n" style="color: #333;">pp_x</span><span class="p">,</span> <span class="n" style="color: #333;">pp_pos</span><span class="p">,</span> <span class="n" style="color: #333;">pp_neg</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">bot</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cache</span><span class="p">]))</span></span>
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<pre style="margin: 0;">+<span id="LC613" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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614
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<pre style="margin: 0;">+<span id="LC614" class="line" lang="haskell"> <span class="n" style="color: #333;">pp_x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC615" class="line" lang="haskell"> <span class="n" style="color: #333;">pp_pos</span></span>
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<pre style="margin: 0;">+<span id="LC616" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">[</span><span class="n" style="color: #333;">p</span><span class="p">]</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pos</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;">p</span> <span class="c1" style="color: #998; font-style: italic;">-- suppress outer [_] if singleton</span></span>
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<pre style="margin: 0;">+<span id="LC617" 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;">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;">pos</span></span>
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<pre style="margin: 0;">+<span id="LC618" class="line" lang="haskell"> <span class="n" style="color: #333;">pp_neg</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;">neg</span></span>
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619
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<pre style="margin: 0;"> <span id="LC619" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC620" class="line" lang="haskell"><span class="cd">-- | Initial state of the term oracle.</span></span>
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<pre style="margin: 0;"> <span id="LC621" class="line" lang="haskell"><span class="n" style="color: #333;">initTmState</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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595
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<pre style="margin: 0;">-<span id="LC595" class="line" lang="haskell"><span class="n" style="color: #333;">initTmState</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="n" style="color: #333;">emptySDIE</span> <span class="n" style="color: #333;">emptyCoreMap</span></span>
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<pre style="margin: 0;">+<span id="LC622" class="line" lang="haskell"><span class="n" style="color: #333;">initTmState</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="n" style="color: #333;">emptySDIE</span> <span class="n" style="color: #333;">emptyCoreMap</span><span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff right">emptyDVarSet</span></span></span>
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<pre style="margin: 0;"> <span id="LC623" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC597" class="line" lang="haskell"><span class="cd">-- | The type oracle state. A poor man's 'GHC.Tc.Solver.Monad.InsertSet': The invariant is</span></span>
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<pre style="margin: 0;">-<span id="LC598" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- that all constraints in there are mutually compatible.</span></span>
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<pre style="margin: 0;">-<span id="LC599" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">TyState</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TySt</span> <span class="kt" style="color: #458; font-weight: 600;">InertSet</span></span>
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<pre style="margin: 0;">+<span id="LC624" class="line" lang="haskell"><span class="cd">-- | The type oracle state. An 'GHC.Tc.Solver.Monad.InsertSet' that we</span></span>
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<pre style="margin: 0;">+<span id="LC625" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- incrementally add local type constraints to, together with a sequence</span></span>
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<pre style="margin: 0;">+<span id="LC626" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- number that counts the number of times we extended it with new facts.</span></span>
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<pre style="margin: 0;">+<span id="LC627" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">TyState</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TySt</span> <span class="p">{</span> <span class="n" style="color: #333;">ty_st_n</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;">Int</span><span class="p">,</span> <span class="n" style="color: #333;">ty_st_inert</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;">InertSet</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC628" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC629" class="line" lang="haskell"><span class="cd">-- | Not user-facing.</span></span>
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<pre style="margin: 0;"> <span id="LC630" 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;">TyState</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC603" 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;">TySt</span> <span class="n" style="color: #333;"><span class="idiff left">inert</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">=</span></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">inert</span></span>
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<pre style="margin: 0;">+<span id="LC631" 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;">TySt</span> <span class="n" style="color: #333;"><span class="idiff left">n</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inert</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">n</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right"><+></span></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">inert</span></span>
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<pre style="margin: 0;"> <span id="LC632" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC633" class="line" lang="haskell"><span class="n" style="color: #333;">initTyState</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyState</span></span>
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<pre style="margin: 0;">-<span id="LC606" class="line" lang="haskell"><span class="n" style="color: #333;">initTyState</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TySt</span> <span class="n" style="color: #333;">emptyInert</span></span>
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<pre style="margin: 0;">+<span id="LC634" class="line" lang="haskell"><span class="n" style="color: #333;">initTyState</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TySt</span> <span class="mi" style="color: #099;"><span class="idiff left">0</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">emptyInert</span></span>
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<pre style="margin: 0;"> <span id="LC635" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC636" class="line" lang="haskell"><span class="cd">-- | A normalised refinement type ∇ (\"nabla\"), comprised of an inert set of</span></span>
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<pre style="margin: 0;"> <span id="LC637" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- canonical (i.e. mutually compatible) term and type constraints that form the</span></span>
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638
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<pre style="margin: 0;"> <span id="LC638" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- refinement type's predicate.</span></span>
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<pre style="margin: 0;">-<span id="LC611" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkNabla</span> <span class="p">{</span> <span class="n" style="color: #333;">nabla_ty_st</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyState</span> <span class="c1" style="color: #998; font-style: italic;">-- Type oracle; things like a~Int</span></span>
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<pre style="margin: 0;">-<span id="LC612" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span> <span class="p">}</span> <span class="c1" style="color: #998; font-style: italic;">-- Term oracle; things like x~Nothing</span></span>
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<pre style="margin: 0;">+<span id="LC639" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span></span>
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<pre style="margin: 0;">+<span id="LC640" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkNabla</span></span>
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<pre style="margin: 0;">+<span id="LC641" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">nabla_ty_st</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;">TyState</span></span>
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<pre style="margin: 0;">+<span id="LC642" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Type oracle; things like a~Int</span></span>
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<pre style="margin: 0;">+<span id="LC643" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">nabla_tm_st</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;">TmState</span></span>
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<pre style="margin: 0;">+<span id="LC644" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Term oracle; things like x~Nothing</span></span>
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<pre style="margin: 0;">+<span id="LC645" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC646" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC647" class="line" lang="haskell"><span class="cd">-- | An initial nabla that is always satisfiable</span></span>
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<pre style="margin: 0;"> <span id="LC648" class="line" lang="haskell"><span class="n" style="color: #333;">initNabla</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f1abbd98e5bc41f51e9fab748adbae4608f06ba3#c69516c9e3cf2716177602126901a5efa3e92675"><strong>compiler/GHC/HsToCore/PmCheck/Types.hs-boot</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.HsToCore.PmCheck.Types</span> <span class="kr" style="font-weight: 600;">where</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="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.Bag</span></span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span></span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;"><span class="idiff left">newtype</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nablas</span></span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkNablas</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;"><span class="idiff left">data</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Nablas</span></span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- </span> = MkNablas (Bag Nabla)</span></span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="haskell"><span class="n" style="color: #333;">initNablas</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nablas</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f1abbd98e5bc41f51e9fab748adbae4608f06ba3#902811828741e6bcd64702935bbb54edbbd070ef"><strong>compiler/GHC/Tc/Gen/Expr.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1229,7 +1229,10 @@ instance OutputableBndrId id => Outputable (HsExprArg id) where</td>
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1229
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1229
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<pre style="margin: 0;"> <span id="LC1229" 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;">HsEPar</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;">text</span> <span class="s" style="color: #d14;">"HsEPar"</span></span>
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1230
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1230
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<pre style="margin: 0;"> <span id="LC1230" 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;">HsEWrap</span> <span class="n" style="color: #333;">w</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">ghcPass</span> <span class="o" style="font-weight: 600;">@</span><span class="n" style="color: #333;">id</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1231
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1231
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<pre style="margin: 0;"> <span id="LC1231" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"HsEWrap"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">w</span></span>
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1232
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<pre style="margin: 0;">+<span id="LC1232" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- TODO: Bump to 900</span></span>
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1233
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<pre style="margin: 0;">+<span id="LC1233" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">__GLASGOW_HASKELL__</span> <span class="o" style="font-weight: 600;"><=</span> <span class="mi" style="color: #099;">810</span></span>
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1232
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1234
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<pre style="margin: 0;"> <span id="LC1234" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">empty</span></span>
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1235
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<pre style="margin: 0;">+<span id="LC1235" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="n" style="color: #333;">endif</span></span>
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1233
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1236
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<pre style="margin: 0;"> <span id="LC1236" class="line" lang="haskell"></span>
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1234
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1237
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<pre style="margin: 0;"> <span id="LC1237" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">XExprTypeArg</span> <span class="n" style="color: #333;">id</span> <span class="kr" style="font-weight: 600;">where</span></span>
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1235
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1238
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<pre style="margin: 0;"> <span id="LC1238" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">XExprTypeArg</span> <span class="kt" style="color: #458; font-weight: 600;">'Parsed</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoExtField</span></span>
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<li id="0a783845cf4a51b83c014878c91e4431b84593e8">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f1abbd98e5bc41f51e9fab748adbae4608f06ba3#0a783845cf4a51b83c014878c91e4431b84593e8"><strong>compiler/GHC/Types/Unique/FuelTank.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cd">-- | Model fuel consumption to detect recursive use of a 'Uniqable' thing.</span></span>
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2
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.Types.Unique.FuelTank</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">FuelTank</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">initFuelTank</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">setFuel</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">burnFuel</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">FuelBurntResult</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span></span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"> <span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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5
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"></span>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Prelude</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Unique</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Unique.FM</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Outputable</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">FuelTank</span> <span class="n" style="color: #333;">uniq</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FT</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">init_fuel</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;">Int</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ The upper bound of encounters</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">encounters</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;">UniqFM</span> <span class="n" style="color: #333;">uniq</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Number of times we have seen a 'u'</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"><span class="cd">-- | Initialise a 'FuelTank' with the given amount of /fuel/, an upper bound</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- for how often a given uniquable thing may be encountered.</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"><span class="n" style="color: #333;">initFuelTank</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FuelTank</span> <span class="n" style="color: #333;">uniq</span></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"><span class="n" style="color: #333;">initFuelTank</span> <span class="n" style="color: #333;">fuel</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FT</span> <span class="p">{</span> <span class="n" style="color: #333;">init_fuel</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fuel</span><span class="p">,</span> <span class="n" style="color: #333;">encounters</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyUFM</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"><span class="cd">-- | Change the upper bound for the number of times a 'FuelTank' is allowed</span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- to encounter each 'TyCon'.</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"><span class="n" style="color: #333;">setFuel</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FuelTank</span> <span class="n" style="color: #333;">uniq</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FuelTank</span> <span class="n" style="color: #333;">uniq</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"><span class="n" style="color: #333;">setFuel</span> <span class="n" style="color: #333;">new_fuel</span> <span class="n" style="color: #333;">tank</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tank</span> <span class="p">{</span> <span class="n" style="color: #333;">init_fuel</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">new_fuel</span> <span class="p">}</span></span>
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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="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">FuelBurntResult</span> <span class="n" style="color: #333;">uniq</span></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">OutOfFuel</span></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">FuelLeft</span> <span class="o" style="font-weight: 600;">!</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FuelTank</span> <span class="n" style="color: #333;">uniq</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"><span class="cd">-- | Burns one fuel in the 'FuelTank' for the given uniq thing. Returns</span></span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'OutOfFuel' when all fuel was burned and @'FuelLeft' tank@ when there's</span></span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- still fuel left in the new @tank@.</span></span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="haskell"><span class="n" style="color: #333;">burnFuel</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Uniquable</span> <span class="n" style="color: #333;">uniq</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">FuelTank</span> <span class="n" style="color: #333;">uniq</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">uniq</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FuelBurntResult</span> <span class="n" style="color: #333;">uniq</span></span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="haskell"><span class="n" style="color: #333;">burnFuel</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FT</span> <span class="n" style="color: #333;">init_fuel</span> <span class="n" style="color: #333;">encounters</span><span class="p">)</span> <span class="n" style="color: #333;">u</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lookupUFM</span> <span class="n" style="color: #333;">encounters</span> <span class="n" style="color: #333;">u</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">fuel_used</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">fuel_used</span> <span class="o" style="font-weight: 600;">>=</span> <span class="n" style="color: #333;">init_fuel</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">OutOfFuel</span></span>
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<pre style="margin: 0;">+<span id="LC38" 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;">FuelLeft</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FT</span> <span class="n" style="color: #333;">init_fuel</span> <span class="p">(</span><span class="n" style="color: #333;">addToUFM_C</span> <span class="p">(</span><span class="o" style="font-weight: 600;">+</span><span class="p">)</span> <span class="n" style="color: #333;">encounters</span> <span class="n" style="color: #333;">u</span> <span class="mi" style="color: #099;">1</span><span class="p">))</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;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FuelTank</span> <span class="n" style="color: #333;">u</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC41" 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;">FT</span> <span class="n" style="color: #333;">init_fuel</span> <span class="n" style="color: #333;">encounters</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">init_fuel</span><span class="p">,</span> <span class="n" style="color: #333;">encounters</span><span class="p">)</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f1abbd98e5bc41f51e9fab748adbae4608f06ba3#0f33fd88c617246c7f89c4477d2d1d24f942df23"><strong>compiler/ghc.cabal.in</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">@@ -565,6 +565,7 @@ Library</td>
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<pre style="margin: 0;"> <span id="LC565" class="line" lang="plaintext"> GHC.Types.Unique.DFM</span>
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<pre style="margin: 0;"> <span id="LC566" class="line" lang="plaintext"> GHC.Types.Unique.DSet</span>
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<pre style="margin: 0;"> <span id="LC567" class="line" lang="plaintext"> GHC.Types.Unique.FM</span>
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<pre style="margin: 0;">+<span id="LC568" class="line" lang="plaintext"> GHC.Types.Unique.FuelTank</span>
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<pre style="margin: 0;"> <span id="LC569" class="line" lang="plaintext"> GHC.Types.Unique.Set</span>
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<pre style="margin: 0;"> <span id="LC570" class="line" lang="plaintext"> GHC.Utils.Misc</span>
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<pre style="margin: 0;"> <span id="LC571" class="line" lang="plaintext"> GHC.Cmm.Dataflow</span>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# OPTIONS_GHC -Wincomplete-patterns -fforce-recomp #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE BangPatterns #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE MagicHash #-}</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE UnboxedTuples #-}</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE UnliftedNewtypes #-}</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE GADTs #-}</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE KindSignatures #-}</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18249</span> <span class="kr" style="font-weight: 600;">where</span></span>
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9
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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;">import</span> <span class="nn" style="color: #555;">GHC.Exts</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="o" style="font-weight: 600;">#</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- redundant, not just inaccessible!</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="n" style="color: #333;">f</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 class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">1</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">2</span></span>
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16
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">UVoid</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TYPE</span> <span class="kt" style="color: #458; font-weight: 600;">'UnliftedRep</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">UVoid</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">UVoid</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">UVoid</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="n" style="color: #333;">g</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">UVoid</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- redundant in a weird way:</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- there's no way to actually write this function.</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Inhabitation testing currently doesn't find that UVoid is empty,</span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- but we should be able to detect the bang as redundant.</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"><span class="n" style="color: #333;">g</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="mi" style="color: #099;">1</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="n" style="color: #333;">h</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="o" style="font-weight: 600;">#</span> <span class="nb" style="color: #0086b3;">()</span><span class="p">,</span> <span class="nb" style="color: #0086b3;">()</span> <span class="o" style="font-weight: 600;">#</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- redundant, not just inaccessible!</span></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"><span class="n" style="color: #333;">h</span> <span class="p">(</span><span class="o" style="font-weight: 600;">#</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">#</span><span class="p">)</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">1</span></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"><span class="n" style="color: #333;">h</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">2</span></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"><span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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33
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="haskell"><span class="n" style="color: #333;">i</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 class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">1</span></span>
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34
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="haskell"><span class="n" style="color: #333;">i</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">I</span><span class="o" 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="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">2</span></span>
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35
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="haskell"><span class="n" style="color: #333;">i</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">3</span></span>
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36
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="haskell"></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f1abbd98e5bc41f51e9fab748adbae4608f06ba3#307f80581cbcfe76d629bd3d5d781205678b0fc3"><strong>testsuite/tests/pmcheck/should_compile/T18249.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T18249.hs:14:8: warning: [-Woverlapping-patterns (in -Wdefault)]</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> Pattern match is redundant</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> In an equation for ‘f’: f !_ | False = ...</span>
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5
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext">T18249.hs:25:4: warning: [-Wredundant-bang-patterns]</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> Pattern match has redundant bang</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext"> In an equation for ‘g’: g _ = ...</span>
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9
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext">T18249.hs:29:16: warning: [-Woverlapping-patterns (in -Wdefault)]</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext"> Pattern match is redundant</span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext"> In an equation for ‘h’: h (# _, _ #) | False = ...</span>
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13
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext">T18249.hs:33:13: warning: [-Woverlapping-patterns (in -Wdefault)]</span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext"> Pattern match has inaccessible right hand side</span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="plaintext"> In an equation for ‘i’: i !_ | False = ...</span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext">T18249.hs:34:13: warning: [-Woverlapping-patterns (in -Wdefault)]</span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="plaintext"> Pattern match is redundant</span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="plaintext"> In an equation for ‘i’: i (I# !_) | False = ...</span></pre>
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<li id="a52966ece03f9e76a93a2c4ea96b9fb25368723d">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f1abbd98e5bc41f51e9fab748adbae4608f06ba3#a52966ece03f9e76a93a2c4ea96b9fb25368723d"><strong>testsuite/tests/pmcheck/should_compile/all.T</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -134,6 +134,8 @@ test('T17977b', collect_compiler_stats('bytes allocated',10), compile,</td>
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134
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<pre style="margin: 0;"> <span id="LC134" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">-fwarn-incomplete-patterns -fwarn-overlapping-patterns</span><span class="p">'])</span></span>
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<pre style="margin: 0;"> <span id="LC135" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18049</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC136" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">-fwarn-incomplete-patterns -fwarn-overlapping-patterns</span><span class="p">'])</span></span>
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<pre style="margin: 0;">+<span id="LC137" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18249</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC138" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">-fwarn-incomplete-patterns -fwarn-overlapping-patterns -Wredundant-bang-patterns</span><span class="p">'])</span></span>
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137
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<pre style="margin: 0;"> <span id="LC139" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18273</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC140" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">-fwarn-incomplete-patterns -fwarn-overlapping-patterns</span><span class="p">'])</span></span>
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<pre style="margin: 0;"> <span id="LC141" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18341</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
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