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<h3>
Marge Bot pushed to branch master
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/7cf09ab013778227caa07b5d7ec9acd5dedd1817">7cf09ab0</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-09-17T01:27:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Do absence analysis on stable unfoldings
Ticket #18638 showed that Very Bad Things happen if we fail
to do absence analysis on stable unfoldings. It's all described
in Note [Absence analysis for stable unfoldings and RULES].
I'm a bit surprised this hasn't bitten us before. Fortunately
the fix is pretty simple.
</pre>
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<h4>6 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#448d7f6e0151c2014de38dead3a902f511c45b75">
compiler/GHC/Core/FVs.hs
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<li class="file-stats">
<a href="#8104fa1b71db6cfc4eb90cd769463d9eb9004619">
compiler/GHC/Core/Opt/DmdAnal.hs
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<li class="file-stats">
<a href="#d09e98aae6ad2eb59d08eac7894b68c0ab820cda">
compiler/GHC/Types/Demand.hs
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<li class="file-stats">
<a href="#f5524f891d9e1416b3c135d8044b7561413b95c8">
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+
testsuite/tests/simplCore/should_run/T18638.hs
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<li class="file-stats">
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+
testsuite/tests/simplCore/should_run/T18638.stdout
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<li class="file-stats">
<a href="#03e40b9006a3cfc01e112fe32513b15c8634f9bc">
testsuite/tests/simplCore/should_run/all.T
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<h4>Changes:</h4>
<li id="448d7f6e0151c2014de38dead3a902f511c45b75">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7cf09ab013778227caa07b5d7ec9acd5dedd1817#448d7f6e0151c2014de38dead3a902f511c45b75"><strong>compiler/GHC/Core/FVs.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">@@ -34,9 +34,10 @@ module GHC.Core.FVs (</td>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">bndrRuleAndUnfoldingVarsDSet</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">idFVs</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;">idRuleVars</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">idRuleRhsVars</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">stableUnfoldingVars</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC37" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">rule<span class="idiff left">RhsFreeVars</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">rule</span>FreeVars</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">rulesFreeVars</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">ruleFreeVars</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">rulesFreeVars</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">rulesFreeVarsDSet</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkRuleInfo</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">ruleLhsFreeIds</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">ruleLhsFreeIdsList</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">ruleRhsFreeVars</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">ruleRhsFreeIds</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">expr_fvs</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="524" 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="525" 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">@@ -524,6 +525,14 @@ ruleLhsFVIds (BuiltinRule {}) = emptyFV</td>
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<pre style="margin: 0;"> <span id="LC525" class="line" lang="haskell"><span class="n" style="color: #333;">ruleLhsFVIds</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="p">{</span> <span class="n" style="color: #333;">ru_bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">ru_args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">args</span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC526" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filterFV</span> <span class="n" style="color: #333;">isLocalId</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">addBndrs</span> <span class="n" style="color: #333;">bndrs</span> <span class="p">(</span><span class="n" style="color: #333;">exprs_fvs</span> <span class="n" style="color: #333;">args</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC527" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC528" class="line" lang="haskell"><span class="n" style="color: #333;">ruleRhsFreeIds</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CoreRule</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span></span>
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<pre style="margin: 0;">+<span id="LC529" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ^ This finds all locally-defined free Ids on the left hand side of a rule</span></span>
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<pre style="margin: 0;">+<span id="LC530" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- and returns them as a non-deterministic set</span></span>
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<pre style="margin: 0;">+<span id="LC531" class="line" lang="haskell"><span class="n" style="color: #333;">ruleRhsFreeIds</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">BuiltinRule</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyVarSet</span></span>
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<pre style="margin: 0;">+<span id="LC532" class="line" lang="haskell"><span class="n" style="color: #333;">ruleRhsFreeIds</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="p">{</span> <span class="n" style="color: #333;">ru_bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">ru_args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">args</span> <span class="p">})</span></span>
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533
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<pre style="margin: 0;">+<span id="LC533" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fvVarSet</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">filterFV</span> <span class="n" style="color: #333;">isLocalId</span> <span class="o" style="font-weight: 600;">$</span></span>
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534
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<pre style="margin: 0;">+<span id="LC534" class="line" lang="haskell"> <span class="n" style="color: #333;">addBndrs</span> <span class="n" style="color: #333;">bndrs</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">exprs_fvs</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">+<span id="LC535" class="line" lang="haskell"></span>
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536
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<pre style="margin: 0;"> <span id="LC536" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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528
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537
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<pre style="margin: 0;"> <span id="LC537" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Rule free var hack] (Not a hack any more)</span></span>
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529
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<pre style="margin: 0;"> <span id="LC538" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<li id="8104fa1b71db6cfc4eb90cd769463d9eb9004619">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7cf09ab013778227caa07b5d7ec9acd5dedd1817#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">@@ -23,6 +23,7 @@ import GHC.Core.Multiplicity ( scaledThing )</td>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Seq</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">seqBinds</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Outputable</span></span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var.Env</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var.Set</span></span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Basic</span></span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">mapAccumL</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.DataCon</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -32,6 +33,7 @@ import GHC.Types.Id.Info</td>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Utils</span></span>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCon</span></span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Type</span></span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.FVs</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">exprFreeIds</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">ruleRhsFreeIds</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Coercion</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">coVarsOfCo</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.FamInstEnv</span></span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Misc</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">@@ -552,7 +554,9 @@ dmdAnalRhsLetDown rec_flag env let_dmd id rhs</td>
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552
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<pre style="margin: 0;"> <span id="LC554" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Demand signatures are computed for a threshold demand based on idArity]</span></span>
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<pre style="margin: 0;"> <span id="LC555" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkRhsDmd</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">rhs_arity</span> <span class="n" style="color: #333;">rhs</span></span>
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556
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<pre style="margin: 0;"> <span id="LC556" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC555" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="n" style="color: #333;">rhs_fv</span> <span class="n" style="color: #333;">rhs_dmds</span> <span class="n" style="color: #333;">rhs_div</span><span class="p">,</span> <span class="n" style="color: #333;">rhs'</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;">rhs_dmd</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;">+<span id="LC557" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">rhs_dmd_ty</span><span class="p">,</span> <span class="n" style="color: #333;">rhs'</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;">rhs_dmd</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;">+<span id="LC558" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="n" style="color: #333;">rhs_fv</span> <span class="n" style="color: #333;">rhs_dmds</span> <span class="n" style="color: #333;">rhs_div</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs_dmd_ty</span></span>
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<pre style="margin: 0;">+<span id="LC559" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC560" class="line" lang="haskell"> <span class="n" style="color: #333;">sig</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkStrictSigForArity</span> <span class="n" style="color: #333;">rhs_arity</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="n" style="color: #333;">sig_fv</span> <span class="n" style="color: #333;">rhs_dmds</span> <span class="n" style="color: #333;">rhs_div</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC561" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC562" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Aggregated demand for cardinality]</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">@@ -560,10 +564,23 @@ dmdAnalRhsLetDown rec_flag env let_dmd id rhs</td>
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<pre style="margin: 0;"> <span id="LC564" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">bs</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">reuseEnv</span> <span class="p">(</span><span class="n" style="color: #333;">delVarEnvList</span> <span class="n" style="color: #333;">rhs_fv</span> <span class="n" style="color: #333;">bs</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC565" 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;">rhs_fv</span></span>
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<pre style="margin: 0;"> <span id="LC566" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC567" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_fv2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs_fv1</span> <span class="p">`</span><span class="n" style="color: #333;">keepAliveDmdEnv</span><span class="p">`</span> <span class="n" style="color: #333;">extra_fvs</span></span>
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<pre style="margin: 0;">+<span id="LC568" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC569" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Lazy and unleashable free variables]</span></span>
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<pre style="margin: 0;">-<span id="LC564" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">lazy_fv</span><span class="p">,</span> <span class="n" style="color: #333;">sig_fv</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitFVs</span> <span class="n" style="color: #333;">is_thunk</span> <span class="n" style="color: #333;">rhs_fv<span class="idiff left right">1</span></span></span>
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<pre style="margin: 0;">+<span id="LC570" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">lazy_fv</span><span class="p">,</span> <span class="n" style="color: #333;">sig_fv</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitFVs</span> <span class="n" style="color: #333;">is_thunk</span> <span class="n" style="color: #333;">rhs_fv<span class="idiff left right">2</span></span></span>
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<pre style="margin: 0;"> <span id="LC571" class="line" lang="haskell"> <span class="n" style="color: #333;">is_thunk</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;">exprIsHNF</span> <span class="n" style="color: #333;">rhs</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;">isJoinId</span> <span class="n" style="color: #333;">id</span><span class="p">)</span></span>
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572
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<pre style="margin: 0;"> <span id="LC572" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC573" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Find the RHS free vars of the unfoldings and RULES</span></span>
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<pre style="margin: 0;">+<span id="LC574" 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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575
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<pre style="margin: 0;">+<span id="LC575" class="line" lang="haskell"> <span class="n" style="color: #333;">extra_fvs</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;">unionVarSet</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">ruleRhsFreeIds</span><span class="p">)</span> <span class="n" style="color: #333;">unf_fvs</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC576" class="line" lang="haskell"> <span class="n" style="color: #333;">idCoreRules</span> <span class="n" style="color: #333;">id</span></span>
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577
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<pre style="margin: 0;">+<span id="LC577" class="line" lang="haskell"></span>
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578
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<pre style="margin: 0;">+<span id="LC578" class="line" lang="haskell"> <span class="n" style="color: #333;">unf</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">realIdUnfolding</span> <span class="n" style="color: #333;">id</span></span>
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579
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<pre style="margin: 0;">+<span id="LC579" class="line" lang="haskell"> <span class="n" style="color: #333;">unf_fvs</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isStableUnfolding</span> <span class="n" style="color: #333;">unf</span></span>
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<pre style="margin: 0;">+<span id="LC580" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">unf_body</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">maybeUnfoldingTemplate</span> <span class="n" style="color: #333;">unf</span></span>
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581
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<pre style="margin: 0;">+<span id="LC581" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">exprFreeIds</span> <span class="n" style="color: #333;">unf_body</span></span>
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<pre style="margin: 0;">+<span id="LC582" 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;">emptyVarSet</span></span>
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<pre style="margin: 0;">+<span id="LC583" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC584" class="line" lang="haskell"><span class="cd">-- | @mkRhsDmd env rhs_arity rhs@ creates a 'CleanDemand' for</span></span>
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<pre style="margin: 0;"> <span id="LC585" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- unleashing on the given function's @rhs@, by creating</span></span>
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<pre style="margin: 0;"> <span id="LC586" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- a call demand of @rhs_arity@</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">@@ -799,6 +816,43 @@ Fortunately, GHC.Core.Opt.Arity gives 'foo' arity 2, which is enough for LetDown</td>
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<pre style="margin: 0;"> <span id="LC816" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">forward plusInt's demand signature, and all is well (see Note [Newtype arity] in</span></span>
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<pre style="margin: 0;"> <span id="LC817" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC.Core.Opt.Arity)! A small example is the test case NewtypeArity.</span></span>
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<pre style="margin: 0;"> <span id="LC818" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC819" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Absence analysis for stable unfoldings and RULES]</span></span>
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<pre style="margin: 0;">+<span id="LC820" 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="LC821" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Ticket #18638 shows that it's really important to do absence analysis</span></span>
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<pre style="margin: 0;">+<span id="LC822" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">for stable unfoldings. Consider</span></span>
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823
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<pre style="margin: 0;">+<span id="LC823" class="line" lang="haskell"></span>
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824
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<pre style="margin: 0;">+<span id="LC824" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g = blah</span></span>
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825
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<pre style="margin: 0;">+<span id="LC825" class="line" lang="haskell"></span>
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826
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<pre style="margin: 0;">+<span id="LC826" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f = \x. ...no use of g....</span></span>
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827
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<pre style="margin: 0;">+<span id="LC827" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> {- f's stable unfolding is f = \x. ...g... -}</span></span>
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828
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<pre style="margin: 0;">+<span id="LC828" class="line" lang="haskell"></span>
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829
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<pre style="margin: 0;">+<span id="LC829" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If f is ever inlined we use 'g'. But f's current RHS makes no use</span></span>
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830
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<pre style="margin: 0;">+<span id="LC830" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of 'g', so if we don't look at the unfolding we'll mark g as Absent,</span></span>
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831
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<pre style="margin: 0;">+<span id="LC831" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and transform to</span></span>
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832
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<pre style="margin: 0;">+<span id="LC832" class="line" lang="haskell"></span>
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833
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<pre style="margin: 0;">+<span id="LC833" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g = error "Entered absent value"</span></span>
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834
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<pre style="margin: 0;">+<span id="LC834" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f = \x. ...</span></span>
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835
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<pre style="margin: 0;">+<span id="LC835" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> {- f's stable unfolding is f = \x. ...g... -}</span></span>
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836
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<pre style="margin: 0;">+<span id="LC836" class="line" lang="haskell"></span>
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837
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<pre style="margin: 0;">+<span id="LC837" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Now if f is subsequently inlined, we'll use 'g' and ... disaster.</span></span>
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838
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<pre style="margin: 0;">+<span id="LC838" class="line" lang="haskell"></span>
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839
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<pre style="margin: 0;">+<span id="LC839" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">SOLUTION: if f has a stable unfolding, adjust its DmdEnv (the demands</span></span>
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840
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<pre style="margin: 0;">+<span id="LC840" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">on its free variables) so that no variable mentioned in its unfolding</span></span>
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841
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<pre style="margin: 0;">+<span id="LC841" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is Absent. This is done by the function Demand.keepAliveDmdEnv.</span></span>
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842
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<pre style="margin: 0;">+<span id="LC842" class="line" lang="haskell"></span>
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843
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<pre style="margin: 0;">+<span id="LC843" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">ALSO: do the same for Ids free in the RHS of any RULES for f.</span></span>
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844
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<pre style="margin: 0;">+<span id="LC844" class="line" lang="haskell"></span>
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845
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<pre style="margin: 0;">+<span id="LC845" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">PS: You may wonder how it can be that f's optimised RHS has somehow</span></span>
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846
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<pre style="margin: 0;">+<span id="LC846" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">discarded 'g', but when f is inlined we /don't/ discard g in the same</span></span>
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847
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<pre style="margin: 0;">+<span id="LC847" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">way. I think a simple example is</span></span>
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848
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<pre style="margin: 0;">+<span id="LC848" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g = (a,b)</span></span>
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849
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<pre style="margin: 0;">+<span id="LC849" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f = \x. fst g</span></span>
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850
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<pre style="margin: 0;">+<span id="LC850" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> {-# INLINE f #-}</span></span>
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851
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<pre style="margin: 0;">+<span id="LC851" class="line" lang="haskell"></span>
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852
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<pre style="margin: 0;">+<span id="LC852" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Now f's optimised RHS will be \x.a, but if we change g to (error "..")</span></span>
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853
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<pre style="margin: 0;">+<span id="LC853" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(since it is apparently Absent) and then inline (\x. fst g) we get</span></span>
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854
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<pre style="margin: 0;">+<span id="LC854" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">disaster. But regardless, #18638 was a more complicated version of</span></span>
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855
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<pre style="margin: 0;">+<span id="LC855" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">this, that actually happened in practice.</span></span>
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856
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<pre style="margin: 0;"> <span id="LC856" class="line" lang="haskell"></span>
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857
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<pre style="margin: 0;"> <span id="LC857" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Historical Note [Product demands for function body]</span></span>
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858
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<pre style="margin: 0;"> <span id="LC858" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<li id="d09e98aae6ad2eb59d08eac7894b68c0ab820cda">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7cf09ab013778227caa07b5d7ec9acd5dedd1817#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">@@ -25,7 +25,7 @@ module GHC.Types.Demand (</td>
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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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26
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">nopDmdType</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;">addDemand</span><span class="p">,</span></span>
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27
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC28" class="line" lang="haskell"> <span class="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="LC28" 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 class="idiff left"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">keepAliveDmdEnv</span></span><span class="p"><span class="idiff right">,</span></span></span>
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29
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<pre style="margin: 0;"> <span id="LC29" 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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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Divergence</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;">lubDivergence</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isDeadEndDiv</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">@@ -59,8 +59,9 @@ module GHC.Types.Demand (</td>
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<pre style="margin: 0;"> <span id="LC59" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="haskell"><span class="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="LC61" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC62" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC62" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Var</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Id</span></span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC63" 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="LC64" 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="LC65" 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="LC66" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Basic</span></span>
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<pre style="margin: 0;"> <span id="LC67" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.Maybe</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">orElse</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">@@ -809,10 +810,22 @@ splitFVs is_thunk rhs_fvs</td>
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810
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<pre style="margin: 0;"> <span id="LC810" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">:*:</span></span>
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<pre style="margin: 0;"> <span id="LC811" class="line" lang="haskell"> <span class="n" style="color: #333;">addToUFM_Directly</span> <span class="n" style="color: #333;">sig_fv</span> <span class="n" style="color: #333;">uniq</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">JD</span> <span class="p">{</span> <span class="n" style="color: #333;">sd</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">s</span><span class="p">,</span> <span class="n" style="color: #333;">ud</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Abs</span> <span class="p">})</span></span>
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812
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<pre style="margin: 0;"> <span id="LC812" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC812" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">StrictPair</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">=</span> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">:*:</span> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">b</span></span>
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<pre style="margin: 0;">+<span id="LC813" 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="LC814" 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="LC815" 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="LC816" 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="LC817" 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="LC818" 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="LC819" 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="LC820" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC821" class="line" lang="haskell"> <span class="n" style="color: #333;">add</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;">DmdEnv</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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822
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<pre style="margin: 0;">+<span id="LC822" class="line" lang="haskell"> <span class="n" style="color: #333;">add</span> <span class="n" style="color: #333;">v</span> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendVarEnv_C</span> <span class="n" style="color: #333;">add_dmd</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">v</span> <span class="n" style="color: #333;">topDmd</span></span>
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813
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823
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<pre style="margin: 0;"> <span id="LC823" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC814" class="line" lang="haskell"><span class="n" style="color: #333;">strictPairToTuple</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">StrictPair</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="n" style="color: #333;">b</span><span class="p">)</span></span>
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815
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<pre style="margin: 0;">-<span id="LC815" class="line" lang="haskell"><span class="n" style="color: #333;">strictPairToTuple</span> <span class="p">(</span><span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">:*:</span> <span class="n" style="color: #333;">y</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="n" style="color: #333;">y</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC824" class="line" lang="haskell"> <span class="n" style="color: #333;">add_dmd</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;">Demand</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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825
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<pre style="margin: 0;">+<span id="LC825" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If the existing usage is Absent, make it used</span></span>
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826
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<pre style="margin: 0;">+<span id="LC826" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Otherwise leave it alone</span></span>
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<pre style="margin: 0;">+<span id="LC827" class="line" lang="haskell"> <span class="n" style="color: #333;">add_dmd</span> <span class="n" style="color: #333;">dmd</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isAbsDmd</span> <span class="n" style="color: #333;">dmd</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">topDmd</span></span>
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<pre style="margin: 0;">+<span id="LC828" 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;">dmd</span></span>
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829
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<pre style="margin: 0;"> <span id="LC829" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC830" class="line" lang="haskell"><span class="n" style="color: #333;">splitProdDmd_maybe</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;">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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831
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<pre style="margin: 0;"> <span id="LC831" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Split a product into its components, iff there is any</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="827" 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="840" 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">@@ -827,6 +840,11 @@ splitProdDmd_maybe (JD { sd = s, ud = u })</td>
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827
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840
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<pre style="margin: 0;"> <span id="LC840" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Lazy</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Use</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UProd</span> <span class="n" style="color: #333;">ux</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;">mkJointDmds</span> <span class="p">(</span><span class="n" style="color: #333;">replicate</span> <span class="p">(</span><span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">ux</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">Lazy</span><span class="p">)</span> <span class="n" style="color: #333;">ux</span><span class="p">)</span></span>
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828
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841
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<pre style="margin: 0;"> <span id="LC841" 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;">Nothing</span></span>
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842
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<pre style="margin: 0;"> <span id="LC842" class="line" lang="haskell"></span>
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843
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<pre style="margin: 0;">+<span id="LC843" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">StrictPair</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">=</span> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">:*:</span> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">b</span></span>
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<pre style="margin: 0;">+<span id="LC844" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC845" class="line" lang="haskell"><span class="n" style="color: #333;">strictPairToTuple</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">StrictPair</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="n" style="color: #333;">b</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC846" class="line" lang="haskell"><span class="n" style="color: #333;">strictPairToTuple</span> <span class="p">(</span><span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">:*:</span> <span class="n" style="color: #333;">y</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="n" style="color: #333;">y</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC847" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC848" 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="LC849" 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="LC850" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> TypeShape and demand trimming</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">@@ -1541,9 +1559,9 @@ There are several wrinkles:</td>
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1541
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1559
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<pre style="margin: 0;"> <span id="LC1559" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> can be evaluated in a short finite time -- and that rules out nasty</span></span>
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1560
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<pre style="margin: 0;"> <span id="LC1560" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> cases like the one above. (I'm not quite sure why this was a</span></span>
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1561
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<pre style="margin: 0;"> <span id="LC1561" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> problem in an earlier version of GHC, but it isn't now.)</span></span>
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1562
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<pre style="margin: 0;">+<span id="LC1562" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1563
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<pre style="margin: 0;"> <span id="LC1563" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1545" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1546" 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="LC1564" 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="LC1565" 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="LC1566" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Demand signatures</span></span>
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1567
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<pre style="margin: 0;"> <span id="LC1567" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7cf09ab013778227caa07b5d7ec9acd5dedd1817#f5524f891d9e1416b3c135d8044b7561413b95c8"><strong>testsuite/tests/simplCore/should_run/T18638.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE ExistentialQuantification, BangPatterns #-}</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;">{-# OPTIONS_GHC -O #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">Main</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">main</span><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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<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;">Data.IORef</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">newIORef</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">readIORef</span><span class="p">)</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;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Step</span> <span class="n" style="color: #333;">s</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Done</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Skip</span> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">s</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Yield</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">Char</span> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">s</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;">Stream</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">s</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">Stream</span> <span class="p">(</span><span class="n" style="color: #333;">s</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Step</span> <span class="n" style="color: #333;">s</span><span class="p">)</span> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">s</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>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="n" style="color: #333;">unstreamList</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Stream</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Char</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="n" style="color: #333;">unstreamList</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Stream</span> <span class="n" style="color: #333;">next</span> <span class="n" style="color: #333;">s0</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;">unfold</span> <span class="n" style="color: #333;">s0</span></span>
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16
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">unfold</span> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">s</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">next</span> <span class="n" style="color: #333;">s</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Done</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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18
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Skip</span> <span class="n" style="color: #333;">s'</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">unfold</span> <span class="n" style="color: #333;">s'</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Yield</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">s'</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">unfold</span> <span class="n" style="color: #333;">s'</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINE [0] unstreamList #-}</span></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"><span class="n" style="color: #333;">appendS</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Stream</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Stream</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Stream</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"><span class="n" style="color: #333;">appendS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Stream</span> <span class="n" style="color: #333;">next</span> <span class="n" style="color: #333;">s</span> <span class="n" style="color: #333;">len</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;">Stream</span> <span class="n" style="color: #333;">next</span> <span class="n" style="color: #333;">s</span> <span class="n" style="color: #333;">len</span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINE [0] appendS #-}</span></span>
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25
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"><span class="n" style="color: #333;">justifyLeftI</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 class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Stream</span></span>
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27
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"><span class="n" style="color: #333;">justifyLeftI</span> <span class="n" style="color: #333;">k</span> <span class="n" style="color: #333;">u</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"> <span class="n" style="color: #333;">next</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">next</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="mi" style="color: #099;">0</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"> <span class="n" style="color: #333;">next</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">n</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"> <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;">k</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Yield</span> <span class="sc" style="color: #d14;">'a'</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">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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<pre style="margin: 0;">+<span id="LC32" 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;">Done</span></span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="haskell"> <span class="cp" style="color: #999; font-weight: 600;">{-# INLINE next #-}</span></span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="kt" style="color: #458; font-weight: 600;">Stream</span> <span class="n" style="color: #333;">next</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="p">(</span><span class="n" style="color: #333;">max</span> <span class="n" style="color: #333;">k</span> <span class="n" style="color: #333;">u</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINE [0] justifyLeftI #-}</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="n" style="color: #333;">prettyPrintLogStats</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="p">[</span><span class="kt" style="color: #458; font-weight: 600;">String</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="haskell"><span class="n" style="color: #333;">prettyPrintLogStats</span> <span class="n" style="color: #333;">rawResults</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">fromRow</span> <span class="n" style="color: #333;">columns</span></span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="haskell"> <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;">columns</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</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="LC42" class="line" lang="haskell"> <span class="n" style="color: #333;">columns</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="mi" style="color: #099;">0</span><span class="p">)</span> <span class="p">[</span><span class="n" style="color: #333;">rawResults</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC44" class="line" lang="haskell"> <span class="n" style="color: #333;">moduleLen</span><span class="p">,</span> <span class="n" style="color: #333;">lineLen</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="LC45" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">moduleLen</span><span class="p">,</span> <span class="n" style="color: #333;">lineLen</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="p">(</span><span class="nf" style="color: #900; 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="p">,</span><span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="mi" style="color: #099;">5</span><span class="p">,</span> <span class="mi" style="color: #099;">2</span><span class="p">))</span> <span class="p">(</span><span class="mi" style="color: #099;">0</span><span class="p">,</span> <span class="mi" style="color: #099;">0</span><span class="p">)</span> <span class="n" style="color: #333;">columns</span></span>
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<pre style="margin: 0;">+<span id="LC46" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC47" class="line" lang="haskell"> <span class="n" style="color: #333;">fromRow</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;">String</span></span>
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="haskell"> <span class="n" style="color: #333;">fromRow</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unstreamList</span> <span class="p">(</span><span class="n" style="color: #333;">justifyLeftI</span> <span class="n" style="color: #333;">moduleLen</span> <span class="n" style="color: #333;">x</span> <span class="p">`</span><span class="n" style="color: #333;">appendS</span><span class="p">`</span> <span class="n" style="color: #333;">justifyLeftI</span> <span class="n" style="color: #333;">lineLen</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC49" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC50" class="line" lang="haskell"><span class="n" style="color: #333;">main</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC51" class="line" lang="haskell"><span class="n" style="color: #333;">main</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="LC52" class="line" lang="haskell"> <span class="n" style="color: #333;">timingsRef</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newIORef</span> <span class="mi" style="color: #099;">0</span></span>
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<pre style="margin: 0;">+<span id="LC53" class="line" lang="haskell"> <span class="n" style="color: #333;">timings</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">readIORef</span> <span class="n" style="color: #333;">timingsRef</span></span>
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<pre style="margin: 0;">+<span id="LC54" class="line" lang="haskell"> <span class="n" style="color: #333;">putStrLn</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">concat</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">prettyPrintLogStats</span> <span class="n" style="color: #333;">timings</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7cf09ab013778227caa07b5d7ec9acd5dedd1817#37d13908140e9e207c80a4f641b17e6261f0a2b9"><strong>testsuite/tests/simplCore/should_run/T18638.stdout</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">aaaaa</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7cf09ab013778227caa07b5d7ec9acd5dedd1817#03e40b9006a3cfc01e112fe32513b15c8634f9bc"><strong>testsuite/tests/simplCore/should_run/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">@@ -92,3 +92,4 @@ test('T17206', exit_code(1), compile_and_run, [''])</td>
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<pre style="margin: 0;"> <span id="LC92" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17151</span><span class="p">',</span> <span class="o" style="font-weight: 600;">[]</span><span class="p">,</span> <span class="nv" style="color: #008080;">multimod_compile_and_run</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">T17151</span><span class="p">',</span> <span class="p">''])</span></span>
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<pre style="margin: 0;"> <span id="LC93" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18012</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC94" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17744</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">+<span id="LC95" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18638</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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