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<h3>
Sebastian Graf pushed to branch wip/refactor-demand
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/187cbcfcc1d7d34a4e84782d27c107be77f5f09e">187cbcfc</a></strong>
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<span>by Sebastian Graf</span>
<i>at 2020-11-02T20:03:57+01:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix seqDemand
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<h4>1 changed file:</h4>
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<a href="#d09e98aae6ad2eb59d08eac7894b68c0ab820cda">
compiler/GHC/Types/Demand.hs
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<h4>Changes:</h4>
<li id="d09e98aae6ad2eb59d08eac7894b68c0ab820cda">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/187cbcfcc1d7d34a4e84782d27c107be77f5f09e#d09e98aae6ad2eb59d08eac7894b68c0ab820cda"><strong>compiler/GHC/Types/Demand.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">@@ -441,7 +441,7 @@ plusCard C_01 C_01 = C_0N -- The upper bound is at least 1, so upper bound of</td>
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<pre style="margin: 0;"> <span id="LC441" class="line" lang="haskell"><span class="n" style="color: #333;">plusCard</span> <span class="kt" style="color: #458; font-weight: 600;">C_01</span> <span class="kt" style="color: #458; font-weight: 600;">C_0N</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">C_0N</span> <span class="c1" style="color: #998; font-style: italic;">-- the result must be 1+1 ~= N.</span></span>
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<pre style="margin: 0;"> <span id="LC442" class="line" lang="haskell"><span class="n" style="color: #333;">plusCard</span> <span class="kt" style="color: #458; font-weight: 600;">C_0N</span> <span class="kt" style="color: #458; font-weight: 600;">C_01</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">C_0N</span> <span class="c1" style="color: #998; font-style: italic;">-- But for the lower bound we have 4 cases where</span></span>
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<pre style="margin: 0;"> <span id="LC443" class="line" lang="haskell"><span class="n" style="color: #333;">plusCard</span> <span class="kt" style="color: #458; font-weight: 600;">C_0N</span> <span class="kt" style="color: #458; font-weight: 600;">C_0N</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">C_0N</span> <span class="c1" style="color: #998; font-style: italic;">-- 0+0 ~= 0 (as opposed to 1), so we match on these.</span></span>
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<pre style="margin: 0;">-<span id="LC444" class="line" lang="haskell"><span class="n" style="color: #333;">plusCard</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">C_1N</span> <span class="c1" style="color: #998; font-style: italic;">-- Otherwise we return <span class="idiff left right">topCard</span></span></span>
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<pre style="margin: 0;">+<span id="LC444" class="line" lang="haskell"><span class="n" style="color: #333;">plusCard</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">C_1N</span> <span class="c1" style="color: #998; font-style: italic;">-- Otherwise we return <span class="idiff left right">{1,n}</span></span></span>
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<pre style="margin: 0;"> <span id="LC445" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC446" class="line" lang="haskell"><span class="cd">-- | Denotes '*' on 'Card'.</span></span>
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<pre style="margin: 0;"> <span id="LC447" class="line" lang="haskell"><span class="n" style="color: #333;">multCard</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Card</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Card</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Card</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">@@ -600,8 +600,12 @@ isUsedOnceDmd (n :* _) = isUsedOnce n</td>
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<pre style="margin: 0;"> <span id="LC600" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC601" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- More utility functions for strictness</span></span>
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<pre style="margin: 0;"> <span id="LC602" class="line" lang="haskell"><span class="n" style="color: #333;">seqDemand</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Demand</span> <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">-<span id="LC603" class="line" lang="haskell"><span class="n" style="color: #333;">seqDemand</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">:*</span> <span class="kt" style="color: #458; font-weight: 600;">Prod</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;">seqDemandList</span> <span class="n" style="color: #333;">ds</span></span>
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<pre style="margin: 0;">-<span id="LC604" class="line" lang="haskell"><span class="n" style="color: #333;">seqDemand</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC603" class="line" lang="haskell"><span class="n" style="color: #333;">seqDemand</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">:*</span> <span class="n" style="color: #333;">cd</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">seqCleanDemand</span> <span class="n" style="color: #333;">cd</span></span>
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<pre style="margin: 0;">+<span id="LC604" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC605" class="line" lang="haskell"><span class="n" style="color: #333;">seqCleanDemand</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CleanDemand</span> <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC606" class="line" lang="haskell"><span class="n" style="color: #333;">seqCleanDemand</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Prod</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;">seqDemandList</span> <span class="n" style="color: #333;">ds</span></span>
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<pre style="margin: 0;">+<span id="LC607" class="line" lang="haskell"><span class="n" style="color: #333;">seqCleanDemand</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Call</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">cd</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">seqCleanDemand</span> <span class="n" style="color: #333;">cd</span></span>
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<pre style="margin: 0;">+<span id="LC608" class="line" lang="haskell"><span class="n" style="color: #333;">seqCleanDemand</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Poly</span> <span class="kr" 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>
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609
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<pre style="margin: 0;"> <span id="LC609" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC610" class="line" lang="haskell"><span class="n" style="color: #333;">seqDemandList</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Demand</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC611" class="line" lang="haskell"><span class="n" style="color: #333;">seqDemandList</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="p">(</span><span class="n" style="color: #333;">seq</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">seqDemand</span><span class="p">)</span> <span class="nb" style="color: #0086b3;">()</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">@@ -710,11 +714,11 @@ isScaleInvariantCleanDmd (Call n _) = isScaleInvariantCard n -- See Note [Scalin</td>
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<pre style="margin: 0;"> <span id="LC714" class="line" lang="haskell"><span class="n" style="color: #333;">isWeakDmd</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Demand</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;"> <span id="LC715" class="line" lang="haskell"><span class="n" style="color: #333;">isWeakDmd</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;">cd</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isStrict</span> <span class="n" style="color: #333;">n</span><span class="p">)</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">isScaleInvariantCleanDmd</span> <span class="n" style="color: #333;">cd</span></span>
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<pre style="margin: 0;"> <span id="LC716" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC713" class="line" lang="haskell"><span class="n" style="color: #333;">keepAliveDmdEnv</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DmdEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IdSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DmdEnv</span></span>
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<pre style="margin: 0;">-<span id="LC714" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (keepAliveDmdType dt vs) makes sure that the Ids in vs have</span></span>
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<pre style="margin: 0;">-<span id="LC715" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- /some/ usage in the returned demand types -- they are not Absent</span></span>
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<pre style="margin: 0;">+<span id="LC717" class="line" lang="haskell"><span class="cd">-- | @keepAliveDmdType dt vs@ makes sure that the Ids in @vs@ have</span></span>
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<pre style="margin: 0;">+<span id="LC718" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- /some/ usage in the returned demand types -- they are not Absent.</span></span>
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<pre style="margin: 0;"> <span id="LC719" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Absence analysis for stable unfoldings and RULES]</span></span>
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<pre style="margin: 0;">-<span id="LC717" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- in GHC.Core.Opt.DmdAnal</span></span>
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<pre style="margin: 0;">+<span id="LC720" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- in "GHC.Core.Opt.DmdAnal".</span></span>
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<pre style="margin: 0;">+<span id="LC721" class="line" lang="haskell"><span class="n" style="color: #333;">keepAliveDmdEnv</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DmdEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IdSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DmdEnv</span></span>
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<pre style="margin: 0;"> <span id="LC722" class="line" lang="haskell"><span class="n" style="color: #333;">keepAliveDmdEnv</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">vs</span></span>
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<pre style="margin: 0;"> <span id="LC723" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nonDetStrictFoldVarSet</span> <span class="n" style="color: #333;">add</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">vs</span></span>
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<pre style="margin: 0;"> <span id="LC724" 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">@@ -802,14 +806,14 @@ lubDivergence _ _ = Dunno</td>
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<pre style="margin: 0;"> <span id="LC806" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- defaultFvDmd (r1 `lubDivergence` r2) = defaultFvDmd r1 `lubDmd` defaultFvDmd r2</span></span>
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<pre style="margin: 0;"> <span id="LC807" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (See Note [Default demand on free variables and arguments] for why)</span></span>
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808
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<pre style="margin: 0;"> <span id="LC808" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC805" class="line" lang="haskell"><span class="n" style="color: #333;">plusDivergence</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Divergence</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Divergence</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Divergence</span></span>
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<pre style="margin: 0;">-<span id="LC806" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Asymmetry of 'plus*'], which concludes that 'plusDivergence' needs</span></span>
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<pre style="margin: 0;">-<span id="LC807" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- to be symmetric.</span></span>
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<pre style="margin: 0;">+<span id="LC809" class="line" lang="haskell"><span class="cd">-- | See Note [Asymmetry of 'plus*'], which concludes that 'plusDivergence'</span></span>
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<pre style="margin: 0;">+<span id="LC810" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- needs to be symmetric.</span></span>
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<pre style="margin: 0;"> <span id="LC811" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Strictly speaking, we should have @plusDivergence Dunno Diverges = ExnOrDiv@.</span></span>
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812
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<pre style="margin: 0;"> <span id="LC812" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- But that regresses in too many places (every infinite loop, basically) to be</span></span>
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813
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<pre style="margin: 0;"> <span id="LC813" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- worth it and is only relevant in higher-order scenarios</span></span>
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<pre style="margin: 0;"> <span id="LC814" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (e.g. Divergence of @f (throwIO blah)@).</span></span>
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<pre style="margin: 0;"> <span id="LC815" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- So 'plusDivergence' currently is 'glbDivergence', really.</span></span>
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<pre style="margin: 0;">+<span id="LC816" class="line" lang="haskell"><span class="n" style="color: #333;">plusDivergence</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Divergence</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Divergence</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Divergence</span></span>
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<pre style="margin: 0;"> <span id="LC817" class="line" lang="haskell"><span class="n" style="color: #333;">plusDivergence</span> <span class="kt" style="color: #458; font-weight: 600;">Dunno</span> <span class="kt" style="color: #458; font-weight: 600;">Dunno</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Dunno</span></span>
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<pre style="margin: 0;"> <span id="LC818" class="line" lang="haskell"><span class="n" style="color: #333;">plusDivergence</span> <span class="kt" style="color: #458; font-weight: 600;">Diverges</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;">Diverges</span></span>
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<pre style="margin: 0;"> <span id="LC819" class="line" lang="haskell"><span class="n" style="color: #333;">plusDivergence</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">Diverges</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Diverges</span></span>
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