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<h3>
Sebastian Graf pushed to branch wip/dmdanal-precise-exn
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/298221029c18c2b2831c07bda03d2e2954eabf7a">29822102</a></strong>
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<span>by Sebastian Graf</span>
<i>at 2020-03-31T18:23:07+02:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Performance tweaks for tryClearPreciseException
Apparently the function wasn't really responsible for regressing T12545.
Maybe it's the fact that we have to serialise more stuff to the
interface file, I don't know.
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<h4>2 changed files:</h4>
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<a href="#1419e35d2402c23209a644b054c5a67aa4463451">
compiler/GHC/Core/Op/DmdAnal.hs
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<a href="#d09e98aae6ad2eb59d08eac7894b68c0ab820cda">
compiler/GHC/Types/Demand.hs
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<h4>Changes:</h4>
<li id="1419e35d2402c23209a644b054c5a67aa4463451">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/298221029c18c2b2831c07bda03d2e2954eabf7a#1419e35d2402c23209a644b054c5a67aa4463451"><strong>compiler/GHC/Core/Op/DmdAnal.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">@@ -338,9 +338,9 @@ dmdAnalAlt env dmd case_bndr (con,bndrs,rhs)</td>
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<pre style="margin: 0;"> <span id="LC338" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- precise exception guarantees are off the table.</span></span>
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<pre style="margin: 0;"> <span id="LC339" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Precise exceptions and strictness analysis] in Demand.hs</span></span>
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<pre style="margin: 0;"> <span id="LC340" class="line" lang="haskell"><span class="n" style="color: #333;">mayThrowPreciseException</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FamInstEnvs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</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="LC341" class="line" lang="haskell"><span class="n" style="color: #333;">mayThrowPreciseException</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">_</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DmdType</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="idiff"> </span><span class="kr" 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">ConOrDiv</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">False</span></span></span>
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<pre style="margin: 0;">-<span id="LC342" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">mayThrowPreciseException</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DmdType</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="idiff"> </span><span class="kr" 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">Diverges</span></span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">-<span id="LC343" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">mayThrowPreciseException</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fam_envs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><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;">forcesRealWorld</span> <span class="n" style="color: #333;">fam_envs</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC341" class="line" lang="haskell"><span class="n" style="color: #333;">mayThrowPreciseException</span> <span class="n" style="color: #333;"><span class="idiff left">fam_envs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">dmd_ty</span></span></span>
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<pre style="margin: 0;">+<span id="LC342" class="line" lang="haskell"><span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff">|</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">not</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">mayThrowPreciseDmdType</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">dmd_ty</span></span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">+<span id="LC343" class="line" lang="haskell"><span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff">|</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">otherwise</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pprTrace</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"mayThrow"</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">ty</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;">forcesRealWorld</span> <span class="n" style="color: #333;">fam_envs</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC344" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC345" class="line" lang="haskell"><span class="cd">-- | Whether a 'seqDmd' on an expression of the given type may force</span></span>
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<pre style="margin: 0;"> <span id="LC346" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @State# RealWorld@, incurring a side-effect (ignoring unsafe shenigans like</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">@@ -374,6 +374,8 @@ forcesRealWorld fam_envs = go initRecTc</td>
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<pre style="margin: 0;"> <span id="LC374" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- precise excpetions.</span></span>
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<pre style="margin: 0;"> <span id="LC375" class="line" lang="haskell"><span class="n" style="color: #333;">tryClearPreciseException</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FamInstEnvs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span></span>
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<pre style="margin: 0;"> <span id="LC376" class="line" lang="haskell"><span class="n" style="color: #333;">tryClearPreciseException</span> <span class="n" style="color: #333;">fam_envs</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">sig</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StrictSig</span> <span class="n" style="color: #333;">dmd_ty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="n" style="color: #333;">fvs</span> <span class="n" style="color: #333;">args</span> <span class="n" style="color: #333;">div</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC377" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">mayThrowPreciseDmdType</span> <span class="n" style="color: #333;">dmd_ty</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Why bother clearing if there is nothing to clear?</span></span>
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378
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<pre style="margin: 0;">+<span id="LC378" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sig</span></span>
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377
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379
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<pre style="margin: 0;"> <span id="LC379" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">arg_tys</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitPiTys</span> <span class="n" style="color: #333;">ty</span></span>
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378
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380
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<pre style="margin: 0;"> <span id="LC380" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">args</span> <span class="p">`</span><span class="n" style="color: #333;">equalLength</span><span class="p">`</span> <span class="n" style="color: #333;">filter</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">isNamedBinder</span><span class="p">)</span> <span class="n" style="color: #333;">arg_tys</span></span>
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379
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381
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<pre style="margin: 0;"> <span id="LC381" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">mayThrowPreciseException</span> <span class="n" style="color: #333;">fam_envs</span> <span class="n" style="color: #333;">res_ty</span> <span class="n" style="color: #333;">dmd_ty</span></span>
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<li id="d09e98aae6ad2eb59d08eac7894b68c0ab820cda">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/298221029c18c2b2831c07bda03d2e2954eabf7a#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">@@ -24,6 +24,7 @@ module GHC.Types.Demand (</td>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DmdType</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;">dmdTypeDepth</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lubDmdType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">bothDmdType</span><span class="p">,</span></span>
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25
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">BothDmdArg</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkBothDmdArg</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">toBothDmdArg</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">emptyDmdType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">botDmdType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkDmdType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">addDemand</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mayThrowPreciseDmdType</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DmdEnv</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">emptyDmdEnv</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">peelFV</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">findIdDemand</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">@@ -1277,6 +1278,11 @@ isTopDmdType (DmdType env [] Dunno)</td>
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1277
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<pre style="margin: 0;"> <span id="LC1278" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isEmptyVarEnv</span> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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1278
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1279
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<pre style="margin: 0;"> <span id="LC1279" class="line" lang="haskell"><span class="n" style="color: #333;">isTopDmdType</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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1279
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1280
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<pre style="margin: 0;"> <span id="LC1280" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1281" class="line" lang="haskell"><span class="n" style="color: #333;">mayThrowPreciseDmdType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</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="LC1282" class="line" lang="haskell"><span class="n" style="color: #333;">mayThrowPreciseDmdType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">Dunno</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">+<span id="LC1283" class="line" lang="haskell"><span class="n" style="color: #333;">mayThrowPreciseDmdType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">ExnOrDiv</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1284" 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">
1284
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<pre style="margin: 0;">+<span id="LC1284" class="line" lang="haskell"><span class="n" style="color: #333;">mayThrowPreciseDmdType</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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1285
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<pre style="margin: 0;">+<span id="LC1285" class="line" lang="haskell"></span>
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1280
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1286
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<pre style="margin: 0;"> <span id="LC1286" class="line" lang="haskell"><span class="n" style="color: #333;">mkDmdType</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="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="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;">DmdType</span></span>
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1281
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1287
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<pre style="margin: 0;"> <span id="LC1287" class="line" lang="haskell"><span class="n" style="color: #333;">mkDmdType</span> <span class="n" style="color: #333;">fv</span> <span class="n" style="color: #333;">ds</span> <span class="n" style="color: #333;">res</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="n" style="color: #333;">fv</span> <span class="n" style="color: #333;">ds</span> <span class="n" style="color: #333;">res</span></span>
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1282
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1288
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<pre style="margin: 0;"> <span id="LC1288" class="line" lang="haskell"></span>
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