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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/3b237ed92121a9ecb884879c5b2da2b3f5f56437">3b237ed9</a></strong>
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<span>by Sebastian Graf</span>
<i>at 2020-10-30T15:50:51+01:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Smart constructor for product demands
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<h4>2 changed files:</h4>
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<a href="#8104fa1b71db6cfc4eb90cd769463d9eb9004619">
compiler/GHC/Core/Opt/DmdAnal.hs
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<a href="#d09e98aae6ad2eb59d08eac7894b68c0ab820cda">
compiler/GHC/Types/Demand.hs
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<h4>Changes:</h4>
<li id="8104fa1b71db6cfc4eb90cd769463d9eb9004619">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3b237ed92121a9ecb884879c5b2da2b3f5f56437#8104fa1b71db6cfc4eb90cd769463d9eb9004619"><strong>compiler/GHC/Core/Opt/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">@@ -244,7 +244,7 @@ dmdAnal' env dmd (Case scrut case_bndr ty [(DataAlt dc, bndrs, rhs)])</td>
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<pre style="margin: 0;"> <span id="LC244" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC245" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Compute demand on the scrutinee</span></span>
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<pre style="margin: 0;"> <span id="LC246" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Demand on scrutinee of a product case]</span></span>
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<pre style="margin: 0;">-<span id="LC247" class="line" lang="haskell"> <span class="n" style="color: #333;">scrut_dmd</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;">id_dmds</span></span>
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<pre style="margin: 0;">+<span id="LC247" class="line" lang="haskell"> <span class="n" style="color: #333;">scrut_dmd</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">mk</span>Prod</span> <span class="n" style="color: #333;">id_dmds</span></span>
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<pre style="margin: 0;"> <span id="LC248" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">scrut_ty</span><span class="p">,</span> <span class="n" style="color: #333;">scrut'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dmdAnal</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">scrut_dmd</span> <span class="n" style="color: #333;">scrut</span></span>
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<pre style="margin: 0;"> <span id="LC249" class="line" lang="haskell"> <span class="n" style="color: #333;">res_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">alt_ty3</span> <span class="p">`</span><span class="n" style="color: #333;">plusDmdType</span><span class="p">`</span> <span class="n" style="color: #333;">toBothDmdArg</span> <span class="n" style="color: #333;">scrut_ty</span></span>
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<pre style="margin: 0;"> <span id="LC250" class="line" lang="haskell"> <span class="n" style="color: #333;">case_bndr'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setIdDemandInfo</span> <span class="n" style="color: #333;">case_bndr</span> <span class="n" style="color: #333;">case_bndr_dmd</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3b237ed92121a9ecb884879c5b2da2b3f5f56437#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">@@ -12,7 +12,7 @@</td>
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<pre style="margin: 0;"> <span id="LC12" 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="LC13" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.Types.Demand</span> <span class="p">(</span></span>
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<pre style="margin: 0;">-<span id="LC15" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Card</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;">Demand</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;">CleanDemand</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Prod</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">viewProd</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Card</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;">Demand</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;">CleanDemand</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Prod</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left">mkProd</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff right"> </span><span class="nf" style="color: #900; font-weight: 600;">viewProd</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">oneifyDmd</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">oneifyCard</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">absDmd</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">topDmd</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">botDmd</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">seqDmd</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">lubCard</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lubDmd</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lubCleanDmd</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">@@ -480,7 +480,7 @@ data CleanDemand</td>
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<pre style="margin: 0;"> <span id="LC480" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Show</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC481" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC482" class="line" lang="haskell"><span class="n" style="color: #333;">poly00</span><span class="p">,</span> <span class="n" style="color: #333;">poly01</span><span class="p">,</span> <span class="n" style="color: #333;">poly0N</span><span class="p">,</span> <span class="n" style="color: #333;">poly11</span><span class="p">,</span> <span class="n" style="color: #333;">poly1N</span><span class="p">,</span> <span class="n" style="color: #333;">poly10</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CleanDemand</span></span>
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<pre style="margin: 0;">-<span id="LC483" class="line" lang="haskell"><span class="n" style="color: #333;">topCleanDmd</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">_</span>botCleanDmd</span><span class="p">,</span> <span class="n" style="color: #333;">seqCleanDmd</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CleanDemand</span></span>
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<pre style="margin: 0;">+<span id="LC483" class="line" lang="haskell"><span class="n" style="color: #333;">topCleanDmd</span><span class="p">,</span> <span class="n" style="color: #333;">botCleanDmd</span><span class="p">,</span> <span class="n" style="color: #333;">seqCleanDmd</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CleanDemand</span></span>
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<pre style="margin: 0;"> <span id="LC484" class="line" lang="haskell"><span class="n" style="color: #333;">poly00</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Poly</span> <span class="kt" style="color: #458; font-weight: 600;">C_00</span></span>
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<pre style="margin: 0;"> <span id="LC485" class="line" lang="haskell"><span class="n" style="color: #333;">poly01</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Poly</span> <span class="kt" style="color: #458; font-weight: 600;">C_01</span></span>
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<pre style="margin: 0;"> <span id="LC486" class="line" lang="haskell"><span class="n" style="color: #333;">poly0N</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Poly</span> <span class="kt" style="color: #458; font-weight: 600;">C_0N</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">@@ -488,7 +488,7 @@ poly11 = Poly C_11</td>
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<pre style="margin: 0;"> <span id="LC488" class="line" lang="haskell"><span class="n" style="color: #333;">poly1N</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Poly</span> <span class="kt" style="color: #458; font-weight: 600;">C_1N</span></span>
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<pre style="margin: 0;"> <span id="LC489" class="line" lang="haskell"><span class="n" style="color: #333;">poly10</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Poly</span> <span class="kt" style="color: #458; font-weight: 600;">C_10</span></span>
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<pre style="margin: 0;"> <span id="LC490" class="line" lang="haskell"><span class="n" style="color: #333;">topCleanDmd</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">poly0N</span></span>
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<pre style="margin: 0;">-<span id="LC491" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left right">_</span>botCleanDmd</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">poly10</span></span>
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<pre style="margin: 0;">+<span id="LC491" class="line" lang="haskell"><span class="n" style="color: #333;">botCleanDmd</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">poly10</span></span>
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<pre style="margin: 0;"> <span id="LC492" class="line" lang="haskell"><span class="n" style="color: #333;">seqCleanDmd</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">poly00</span></span>
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<pre style="margin: 0;"> <span id="LC493" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC494" class="line" lang="haskell"><span class="n" style="color: #333;">polyDmd</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;">Demand</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">@@ -512,6 +512,21 @@ lazyApply1Dmd = C_01 :* Call C_01 topCleanDmd</td>
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<pre style="margin: 0;"> <span id="LC512" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- but is lazy (might not be called at all)</span></span>
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<pre style="margin: 0;"> <span id="LC513" class="line" lang="haskell"><span class="n" style="color: #333;">lazyApply2Dmd</span> <span class="o" style="font-weight: 600;">=</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;">Call</span> <span class="kt" style="color: #458; font-weight: 600;">C_01</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Call</span> <span class="kt" style="color: #458; font-weight: 600;">C_01</span> <span class="n" style="color: #333;">topCleanDmd</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC514" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC515" class="line" lang="haskell"><span class="cd">-- | A smart constructor for 'Prod', applying rewrite rules along the semantic</span></span>
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<pre style="margin: 0;">+<span id="LC516" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- equalities @Prod [polyDmd n, ...] === polyDmd n@, simplifying to polymorphic</span></span>
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<pre style="margin: 0;">+<span id="LC517" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- demands when possible. Note that this degrades boxity information! E.g. a</span></span>
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<pre style="margin: 0;">+<span id="LC518" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- polymorphic demand will never unbox.</span></span>
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<pre style="margin: 0;">+<span id="LC519" class="line" lang="haskell"><span class="n" style="color: #333;">mkProd</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;">CleanDemand</span></span>
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<pre style="margin: 0;">+<span id="LC520" class="line" lang="haskell"><span class="n" style="color: #333;">mkProd</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;">botCleanDmd</span></span>
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<pre style="margin: 0;">+<span id="LC521" class="line" lang="haskell"><span class="n" style="color: #333;">mkProd</span> <span class="n" style="color: #333;">ds</span><span class="o" style="font-weight: 600;">@</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="o" style="font-weight: 600;">:</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC522" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">want_to_simplify</span> <span class="n" style="color: #333;">n</span><span class="p">,</span> <span class="n" style="color: #333;">all</span> <span class="p">(</span><span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">polyDmd</span> <span class="n" style="color: #333;">n</span><span class="p">)</span> <span class="n" style="color: #333;">ds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cd</span></span>
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<pre style="margin: 0;">+<span id="LC523" 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;">Prod</span> <span class="n" style="color: #333;">ds</span></span>
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<pre style="margin: 0;">+<span id="LC524" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC525" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we only want to simplify absent and bottom demands</span></span>
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<pre style="margin: 0;">+<span id="LC526" class="line" lang="haskell"> <span class="n" style="color: #333;">want_to_simplify</span> <span class="kt" style="color: #458; font-weight: 600;">C_00</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="LC527" class="line" lang="haskell"> <span class="n" style="color: #333;">want_to_simplify</span> <span class="kt" style="color: #458; font-weight: 600;">C_10</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="LC528" class="line" lang="haskell"> <span class="n" style="color: #333;">want_to_simplify</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">+<span id="LC529" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC530" class="line" lang="haskell"><span class="n" style="color: #333;">viewProd</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Arity</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="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Demand</span><span class="p">]</span></span>
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516
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531
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<pre style="margin: 0;"> <span id="LC531" class="line" lang="haskell"><span class="n" style="color: #333;">viewProd</span> <span class="n" style="color: #333;">n</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;">ds</span> <span class="p">`</span><span class="n" style="color: #333;">lengthIs</span><span class="p">`</span> <span class="n" style="color: #333;">n</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;">ds</span></span>
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517
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532
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<pre style="margin: 0;"> <span id="LC532" class="line" lang="haskell"><span class="n" style="color: #333;">viewProd</span> <span class="n" style="color: #333;">n</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Poly</span> <span class="n" style="color: #333;">card</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">replicate</span> <span class="n" style="color: #333;">n</span> <span class="p">(</span><span class="n" style="color: #333;">polyDmd</span> <span class="n" style="color: #333;">card</span><span class="p">))</span></span>
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