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<h3>
Sebastian Graf pushed to branch wip/T18870
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/18940dbffe81cf59209358753a665d9c46ccae20">18940dbf</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-11-11T11:03:49+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Arity: Rework `ArityType` to fix monotonicity (#18870)
As we found out in #18870, `andArityType` is not monotone, with
potentially severe consequences for termination of fixed-point
iteration. That showed in an abundance of "Exciting arity" DEBUG
messages that are emitted whenever we do more than one step in
fixed-point iteration.
The solution necessitates also recording `OneShotInfo` info for
`ABot` arity type. Thus we get the following definition for `ArityType`:
```
data ArityType = AT [OneShotInfo] Divergence
```
The majority of changes in this patch are the result of refactoring use
sites of `ArityType` to match the new definition.
The regression test `T18870` asserts that we indeed don't emit any DEBUG
output anymore for a function where we previously would have.
Similarly, there's a regression test `T18937` for #18937, which we
expect to be broken for now.
Fixes #18870.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ff98c9f1d91fc04378308f78d682b0f95bbe29ce">ff98c9f1</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-11-11T11:03:49+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Arity: Emit "Exciting arity" warning only after second iteration (#18937)
See Note [Exciting arity] why we emit the warning at all and why we only
do after the second iteration now.
</pre>
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<h4>6 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#c3967bb9d3e8f5aae2dd111b5a335b48c21c1999">
compiler/GHC/Core/Opt/Arity.hs
</a>
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<li class="file-stats">
<a href="#f168a93cde5e2aec2441d6331dfe500172df4af3">
compiler/GHC/Core/Opt/Simplify.hs
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<li class="file-stats">
<a href="#48fbb5cdea308650de5756521feb28ec68819b9b">
compiler/GHC/Core/Opt/Simplify/Utils.hs
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<li class="file-stats">
<a href="#f4d25a96cf3db4c0e06615b13bb644bf49697809">
<span class="new-file">
+
testsuite/tests/arityanal/should_compile/T18870.hs
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<li class="file-stats">
<a href="#59e980235f621b2b9fa27b8f5197c0c6d2555045">
<span class="new-file">
+
testsuite/tests/arityanal/should_compile/T18937.hs
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<li class="file-stats">
<a href="#d67c329c07c6c486d54ae87ffc8be9188c198bcc">
testsuite/tests/arityanal/should_compile/all.T
</a>
</li>
</ul>
<h4>Changes:</h4>
<li id="c3967bb9d3e8f5aae2dd111b5a335b48c21c1999">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/6d868f11fe4c3c4f1892c22780d8742fb8a5e356...ff98c9f1d91fc04378308f78d682b0f95bbe29ce#c3967bb9d3e8f5aae2dd111b5a335b48c21c1999"><strong>compiler/GHC/Core/Opt/Arity.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">@@ -17,14 +17,14 @@ module GHC.Core.Opt.Arity</td>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">etaExpand</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">etaExpandAT</span></span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">exprBotStrictness_maybe</span></span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC20" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="c1" style="color: #998; font-style: italic;">-- ** ArityType</span></span>
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<pre style="margin: 0;">-<span id="LC21" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</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;"><span class="idiff left">expandableArityType</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">arityTypeArity</span></span></span>
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<pre style="margin: 0;">-<span id="LC22" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left">maxWithArity</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">isBotArityType</span></span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">idArityType</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ** ArityType</span></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</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;"><span class="idiff left">mkBotArityType</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">mkTopArityType</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">expandableArityType</span></span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left">arityTypeArity</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">maxWithArity</span></span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">idArityType</span></span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC24" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="c1" style="color: #998; font-style: italic;">-- ** Join points</span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ** Join points</span></span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">etaExpandToJoinPoint</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">etaExpandToJoinPointRule</span></span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC27" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="c1" style="color: #998; font-style: italic;">-- ** Coercions and casts</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ** Coercions and casts</span></span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pushCoArg</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pushCoArgs</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pushCoValArg</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pushCoTyArg</span></span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pushCoercionIntoLambda</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pushCoDataCon</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">collectBindersPushingCo</span></span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"> <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">@@ -455,27 +455,36 @@ ArityType is the result of a compositional analysis on expressions,</td>
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<pre style="margin: 0;"> <span id="LC455" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">from which we can decide the real arity of the expression (extracted</span></span>
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<pre style="margin: 0;"> <span id="LC456" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with function exprEtaExpandArity).</span></span>
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<pre style="margin: 0;"> <span id="LC457" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC458" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We use the following notation:</span></span>
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<pre style="margin: 0;">+<span id="LC459" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> at ::= \o1..on.div</span></span>
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<pre style="margin: 0;">+<span id="LC460" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> div ::= T | x | ⊥</span></span>
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<pre style="margin: 0;">+<span id="LC461" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> o ::= ? | 1</span></span>
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<pre style="margin: 0;">+<span id="LC462" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">And omit the \. if n = 0. Examples:</span></span>
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<pre style="margin: 0;">+<span id="LC463" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> \?11.T stands for @AT [NoOneShotInfo,OneShotLam,OneShotLam] topDiv@</span></span>
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<pre style="margin: 0;">+<span id="LC464" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ⊥ stands for @AT [] botDiv@</span></span>
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<pre style="margin: 0;">+<span id="LC465" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See the 'Outputable' instance for more information. It's pretty simple.</span></span>
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<pre style="margin: 0;">+<span id="LC466" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC467" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here is what the fields mean. If an arbitrary expression 'f' has</span></span>
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<pre style="margin: 0;"> <span id="LC468" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">ArityType 'at', then</span></span>
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<pre style="margin: 0;"> <span id="LC469" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC461" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * If at = ABot n, then (f x1..xn) definitely diverges. Partial</span></span>
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<pre style="margin: 0;">-<span id="LC462" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> applications to fewer than n args may *or may not* diverge.</span></span>
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<pre style="margin: 0;">+<span id="LC470" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * If @at = AT [o1,..,on] botDiv@ (notation: \o1..on.⊥), then @f x1..xn@</span></span>
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<pre style="margin: 0;">+<span id="LC471" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> definitely diverges. Partial applications to fewer than n args may *or</span></span>
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<pre style="margin: 0;">+<span id="LC472" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> may not* diverge.</span></span>
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<pre style="margin: 0;"> <span id="LC474" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We allow ourselves to eta-expand bottoming functions, even</span></span>
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<pre style="margin: 0;"> <span id="LC475" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> if doing so may lose some `seq` sharing,</span></span>
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<pre style="margin: 0;"> <span id="LC476" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> let x = <expensive> in \y. error (g x y)</span></span>
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<pre style="margin: 0;"> <span id="LC477" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ==> \y. let x = <expensive> in error (g x y)</span></span>
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<pre style="margin: 0;"> <span id="LC478" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC469" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * If at = ATop as, and n=length as,</span></span>
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<pre style="margin: 0;">-<span id="LC470" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> then expanding 'f' to (\x1..xn. f x1 .. xn) loses no sharing,</span></span>
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<pre style="margin: 0;">-<span id="LC471" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> assuming the calls of f respect the one-shot-ness of</span></span>
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<pre style="margin: 0;">-<span id="LC472" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> its definition.</span></span>
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<pre style="margin: 0;">+<span id="LC479" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * If @at = AT [o1,..,on] topDiv@ (notation: \o1..on.T), then expanding 'f'</span></span>
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<pre style="margin: 0;">+<span id="LC480" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> to @\x1..xn. f x1..xn@ loses no sharing, assuming the calls of f respect</span></span>
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<pre style="margin: 0;">+<span id="LC481" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the one-shot-ness o1..on of its definition.</span></span>
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<pre style="margin: 0;"> <span id="LC482" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC474" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> NB 'f' is an arbitrary expression, eg <span class="idiff left right">(f = g e1 e2). This 'f'</span></span></span>
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<pre style="margin: 0;">-<span id="LC475" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">can have ArityType as ATop, with length as > 0, only if e1 e2 are</span></span></span>
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<pre style="margin: 0;">-<span id="LC476" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">themselves</span>.</span></span>
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<pre style="margin: 0;">+<span id="LC483" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> NB 'f' is an arbitrary expression, eg <span class="idiff left right">@f = g e1 e2@. This 'f' can have</span></span></span>
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<pre style="margin: 0;">+<span id="LC484" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">arity type @AT oss _@, with @length oss > 0@, only if e1 e2 are themselves</span></span></span>
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<pre style="margin: 0;">+<span id="LC485" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">cheap</span>.</span></span>
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<pre style="margin: 0;"> <span id="LC486" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC478" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * In both cases, <span class="idiff left right">f, (f x1), ... (f x1 ... f(n-1))</span> are definitely</span></span>
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<pre style="margin: 0;">+<span id="LC487" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * In both cases, <span class="idiff left right">@f@, @f x1@, ... @f x1 ... x(n-1)@</span> are definitely</span></span>
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<pre style="margin: 0;"> <span id="LC488" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> really functions, or bottom, but *not* casts from a data type, in</span></span>
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489
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<pre style="margin: 0;"> <span id="LC489" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> at least one case branch. (If it's a function in one case branch but</span></span>
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490
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<pre style="margin: 0;"> <span id="LC490" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> an unsafe cast from a data type in another, the program is bogus.)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -485,62 +494,128 @@ ArityType 'at', then</td>
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<pre style="margin: 0;"> <span id="LC494" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Example:</span></span>
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<pre style="margin: 0;"> <span id="LC495" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f = \x\y. let v = <expensive> in</span></span>
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<pre style="margin: 0;"> <span id="LC496" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> \s(one-shot) \t(one-shot). blah</span></span>
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<pre style="margin: 0;">-<span id="LC488" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 'f' has <span class="idiff left right">ArityType [ManyShot,ManyShot,OneShot,OneShot]</span></span></span>
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<pre style="margin: 0;">+<span id="LC497" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 'f' has <span class="idiff left right">arity type \??11.T</span></span></span>
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<pre style="margin: 0;"> <span id="LC498" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The one-shot-ness means we can, in effect, push that</span></span>
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<pre style="margin: 0;"> <span id="LC499" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 'let' inside the \st.</span></span>
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<pre style="margin: 0;"> <span id="LC500" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC501" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC502" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Suppose f = \xy. x+y</span></span>
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<pre style="margin: 0;">-<span id="LC494" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Then f :: AT [False,False] ATop</span></span>
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<pre style="margin: 0;">-<span id="LC495" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f v :: AT [False] ATop</span></span>
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<pre style="margin: 0;">-<span id="LC496" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f <expensive> :: AT [] ATop</span></span>
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<pre style="margin: 0;">-<span id="LC497" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC498" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-------------------- Main arity code ----------------------------</span></span>
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<pre style="margin: 0;">+<span id="LC503" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Then f :: \??.T</span></span>
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<pre style="margin: 0;">+<span id="LC504" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f v :: \?.T</span></span>
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<pre style="margin: 0;">+<span id="LC505" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f <expensive> :: T</span></span>
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<pre style="margin: 0;"> <span id="LC506" 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="LC507" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC508" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC502" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [ArityType]</span></span>
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<pre style="margin: 0;">-<span id="LC503" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">OneShotInfo</span><span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC504" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ABot</span> <span class="kt" style="color: #458; font-weight: 600;">Arity</span></span>
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505
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<pre style="margin: 0;">-<span id="LC505" 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>
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<pre style="margin: 0;">-<span id="LC506" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- There is always an explicit lambda</span></span>
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507
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<pre style="margin: 0;">-<span id="LC507" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to justify the [OneShot], or the Arity</span></span>
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508
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<pre style="margin: 0;">-<span id="LC508" class="line" lang="haskell"></span>
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509
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<pre style="margin: 0;">+<span id="LC509" class="line" lang="haskell"><span class="cd">-- | The analysis lattice of arity analysis. It is isomorphic to</span></span>
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510
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<pre style="margin: 0;">+<span id="LC510" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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511
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<pre style="margin: 0;">+<span id="LC511" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @</span></span>
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512
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<pre style="margin: 0;">+<span id="LC512" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- data ArityType'</span></span>
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513
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<pre style="margin: 0;">+<span id="LC513" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- = AEnd Divergence</span></span>
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514
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<pre style="margin: 0;">+<span id="LC514" class="line" lang="haskell"><span class="cd">-- | ALam OneShotInfo ArityType'</span></span>
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515
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<pre style="margin: 0;">+<span id="LC515" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @</span></span>
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516
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<pre style="margin: 0;">+<span id="LC516" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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517
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<pre style="margin: 0;">+<span id="LC517" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Which is easier to display the Hasse diagram for:</span></span>
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518
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<pre style="margin: 0;">+<span id="LC518" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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519
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<pre style="margin: 0;">+<span id="LC519" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @</span></span>
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520
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<pre style="margin: 0;">+<span id="LC520" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ALam OneShotLam at</span></span>
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521
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<pre style="margin: 0;">+<span id="LC521" class="line" lang="haskell"><span class="cd">-- |</span></span>
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522
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<pre style="margin: 0;">+<span id="LC522" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- AEnd topDiv</span></span>
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523
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<pre style="margin: 0;">+<span id="LC523" class="line" lang="haskell"><span class="cd">-- |</span></span>
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524
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<pre style="margin: 0;">+<span id="LC524" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ALam NoOneShotInfo at</span></span>
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525
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<pre style="margin: 0;">+<span id="LC525" class="line" lang="haskell"><span class="cd">-- |</span></span>
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526
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<pre style="margin: 0;">+<span id="LC526" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- AEnd exnDiv</span></span>
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527
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<pre style="margin: 0;">+<span id="LC527" class="line" lang="haskell"><span class="cd">-- |</span></span>
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528
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<pre style="margin: 0;">+<span id="LC528" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- AEnd botDiv</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;">-- @</span></span>
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530
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<pre style="margin: 0;">+<span id="LC530" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC531" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- where the @at@ fields of @ALam@ are inductively subject to the same order.</span></span>
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<pre style="margin: 0;">+<span id="LC532" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- That is, @ALam os at1 < ALam os at2@ iff @at1 < at2@.</span></span>
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533
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<pre style="margin: 0;">+<span id="LC533" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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534
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<pre style="margin: 0;">+<span id="LC534" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Why the strange Top element? See Note [Combining case branches].</span></span>
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535
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<pre style="margin: 0;">+<span id="LC535" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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536
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<pre style="margin: 0;">+<span id="LC536" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We rely on this lattice structure for fixed-point iteration in</span></span>
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537
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<pre style="margin: 0;">+<span id="LC537" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'findRhsArity'. For the semantics of 'ArityType', see Note [ArityType].</span></span>
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538
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<pre style="margin: 0;">+<span id="LC538" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span></span>
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539
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<pre style="margin: 0;">+<span id="LC539" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">AT</span> <span class="o" style="font-weight: 600;">!</span><span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">OneShotInfo</span><span class="p">]</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">Divergence</span></span>
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<pre style="margin: 0;">+<span id="LC540" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ @AT oss div@ means this value can safely be eta-expanded @length oss@</span></span>
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541
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<pre style="margin: 0;">+<span id="LC541" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- times, provided use sites respect the 'OneShotInfo's in @oss@.</span></span>
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542
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<pre style="margin: 0;">+<span id="LC542" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- A 'OneShotLam' annotation can come from two sources:</span></span>
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543
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<pre style="margin: 0;">+<span id="LC543" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * The user annotated a lambda as one-shot with 'GHC.Exts.oneShot'</span></span>
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544
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<pre style="margin: 0;">+<span id="LC544" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * It's from a lambda binder of a type affected by `-fstate-hack`.</span></span>
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545
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<pre style="margin: 0;">+<span id="LC545" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See 'idStateHackOneShotInfo'.</span></span>
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546
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<pre style="margin: 0;">+<span id="LC546" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- In both cases, 'OneShotLam' should win over 'NoOneShotInfo', see</span></span>
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547
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<pre style="margin: 0;">+<span id="LC547" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Combining case branches].</span></span>
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548
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<pre style="margin: 0;">+<span id="LC548" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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549
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<pre style="margin: 0;">+<span id="LC549" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If @div@ is dead-ending ('isDeadEndDiv'), then application to</span></span>
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550
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<pre style="margin: 0;">+<span id="LC550" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- @length os@ arguments will surely diverge, similar to the situation</span></span>
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551
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<pre style="margin: 0;">+<span id="LC551" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- with 'DmdType'.</span></span>
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<pre style="margin: 0;">+<span id="LC552" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span></span>
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<pre style="margin: 0;">+<span id="LC553" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC554" class="line" lang="haskell"><span class="cd">-- | This is the BNF of the generated output:</span></span>
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<pre style="margin: 0;">+<span id="LC555" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC556" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @</span></span>
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<pre style="margin: 0;">+<span id="LC557" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @</span></span>
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<pre style="margin: 0;">+<span id="LC558" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC559" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We format</span></span>
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<pre style="margin: 0;">+<span id="LC560" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @AT [o1,..,on] topDiv@ as @\o1..on.T@ and</span></span>
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<pre style="margin: 0;">+<span id="LC561" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @AT [o1,..,on] botDiv@ as @\o1..on.⊥@, respectively.</span></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;">-- More concretely, @AT [NOI,OS,OS] topDiv@ is formatted as @\?11.T@.</span></span>
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<pre style="margin: 0;">+<span id="LC563" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If the one-shot info is empty, we omit the leading @\.@.</span></span>
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<pre style="margin: 0;"> <span id="LC564" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC510" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="n" style="color: #333;">os</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"ATop"</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">parens</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">os</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC511" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ABot</span> <span class="n" style="color: #333;">n</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"ABot"</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">parens</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">n</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC565" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AT</span> <span class="n" style="color: #333;">oss</span> <span class="n" style="color: #333;">div</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC566" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">oss</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pp_div</span> <span class="n" style="color: #333;">div</span></span>
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<pre style="margin: 0;">+<span id="LC567" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">char</span> <span class="sc" style="color: #d14;">'</span><span class="se" style="color: #d14;">\\</span><span class="sc" style="color: #d14;">'</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">hcat</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">pp_os</span> <span class="n" style="color: #333;">oss</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">dot</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">pp_div</span> <span class="n" style="color: #333;">div</span></span>
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<pre style="margin: 0;">+<span id="LC568" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC569" class="line" lang="haskell"> <span class="n" style="color: #333;">pp_div</span> <span class="kt" style="color: #458; font-weight: 600;">Diverges</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">char</span> <span class="sc" style="color: #d14;">'⊥'</span></span>
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<pre style="margin: 0;">+<span id="LC570" class="line" lang="haskell"> <span class="n" style="color: #333;">pp_div</span> <span class="kt" style="color: #458; font-weight: 600;">ExnOrDiv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">char</span> <span class="sc" style="color: #d14;">'x'</span></span>
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<pre style="margin: 0;">+<span id="LC571" class="line" lang="haskell"> <span class="n" style="color: #333;">pp_div</span> <span class="kt" style="color: #458; font-weight: 600;">Dunno</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">char</span> <span class="sc" style="color: #d14;">'T'</span></span>
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<pre style="margin: 0;">+<span id="LC572" class="line" lang="haskell"> <span class="n" style="color: #333;">pp_os</span> <span class="kt" style="color: #458; font-weight: 600;">OneShotLam</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">char</span> <span class="sc" style="color: #d14;">'1'</span></span>
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<pre style="margin: 0;">+<span id="LC573" class="line" lang="haskell"> <span class="n" style="color: #333;">pp_os</span> <span class="kt" style="color: #458; font-weight: 600;">NoOneShotInfo</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">char</span> <span class="sc" style="color: #d14;">'?'</span></span>
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<pre style="margin: 0;"> <span id="LC574" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC513" class="line" lang="haskell"><span class="n" style="color: #333;">arityTypeArity</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Arity</span></span>
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<pre style="margin: 0;">-<span id="LC514" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The number of value args for the arity type</span></span>
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<pre style="margin: 0;">-<span id="LC515" class="line" lang="haskell"><span class="n" style="color: #333;">arityTypeArity</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="n" style="color: #333;">oss</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">oss</span></span>
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<pre style="margin: 0;">-<span id="LC516" class="line" lang="haskell"><span class="n" style="color: #333;">arityTypeArity</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ABot</span> <span class="n" style="color: #333;">ar</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ar</span></span>
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<pre style="margin: 0;">+<span id="LC575" class="line" lang="haskell"><span class="n" style="color: #333;">mkBotArityType</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">OneShotInfo</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span></span>
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<pre style="margin: 0;">+<span id="LC576" class="line" lang="haskell"><span class="n" style="color: #333;">mkBotArityType</span> <span class="n" style="color: #333;">oss</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">AT</span> <span class="n" style="color: #333;">oss</span> <span class="n" style="color: #333;">botDiv</span></span>
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<pre style="margin: 0;"> <span id="LC577" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC518" class="line" lang="haskell"><span class="n" style="color: #333;">expandableArityType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">-<span id="LC519" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- True <=> eta-expansion will add at least one lambda</span></span>
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<pre style="margin: 0;">-<span id="LC520" class="line" lang="haskell"><span class="n" style="color: #333;">expandableArityType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="n" style="color: #333;">oss</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;">null</span> <span class="n" style="color: #333;">oss</span><span class="p">)</span></span>
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521
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<pre style="margin: 0;">-<span id="LC521" class="line" lang="haskell"><span class="n" style="color: #333;">expandableArityType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ABot</span> <span class="n" style="color: #333;">ar</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ar</span> <span class="o" style="font-weight: 600;">/=</span> <span class="mi" style="color: #099;">0</span></span>
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<pre style="margin: 0;">+<span id="LC578" class="line" lang="haskell"><span class="n" style="color: #333;">botArityType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span></span>
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<pre style="margin: 0;">+<span id="LC579" class="line" lang="haskell"><span class="n" style="color: #333;">botArityType</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkBotArityType</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;"> <span id="LC580" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC523" class="line" lang="haskell"><span class="n" style="color: #333;">isBotArityType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">-<span id="LC524" class="line" lang="haskell"><span class="n" style="color: #333;">isBotArityType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ABot</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">-<span id="LC525" class="line" lang="haskell"><span class="n" style="color: #333;">isBotArityType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">+<span id="LC581" class="line" lang="haskell"><span class="n" style="color: #333;">mkTopArityType</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">OneShotInfo</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span></span>
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<pre style="margin: 0;">+<span id="LC582" class="line" lang="haskell"><span class="n" style="color: #333;">mkTopArityType</span> <span class="n" style="color: #333;">oss</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">AT</span> <span class="n" style="color: #333;">oss</span> <span class="n" style="color: #333;">topDiv</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="LC527" class="line" lang="haskell"><span class="n" style="color: #333;">arityTypeOneShots</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">OneShotInfo</span><span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC528" class="line" lang="haskell"><span class="n" style="color: #333;">arityTypeOneShots</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="n" style="color: #333;">oss</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">oss</span></span>
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<pre style="margin: 0;">-<span id="LC529" class="line" lang="haskell"><span class="n" style="color: #333;">arityTypeOneShots</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ABot</span> <span class="n" style="color: #333;">ar</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">replicate</span> <span class="n" style="color: #333;">ar</span> <span class="kt" style="color: #458; font-weight: 600;">OneShotLam</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;">-- If we are diveging or throwing an exception anyway</span></span>
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<pre style="margin: 0;">-<span id="LC531" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- it's fine to push redexes inside the lambdas</span></span>
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<pre style="margin: 0;">+<span id="LC584" class="line" lang="haskell"><span class="n" style="color: #333;">topArityType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span></span>
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<pre style="margin: 0;">+<span id="LC585" class="line" lang="haskell"><span class="n" style="color: #333;">topArityType</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTopArityType</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;"> <span id="LC586" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC533" class="line" lang="haskell"><span class="n" style="color: #333;">botArityType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span></span>
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<pre style="margin: 0;">-<span id="LC534" class="line" lang="haskell"><span class="n" style="color: #333;">botArityType</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ABot</span> <span class="mi" style="color: #099;">0</span> <span class="c1" style="color: #998; font-style: italic;">-- Unit for andArityType</span></span>
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<pre style="margin: 0;">+<span id="LC587" class="line" lang="haskell"><span class="cd">-- | The number of value args for the arity type</span></span>
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<pre style="margin: 0;">+<span id="LC588" class="line" lang="haskell"><span class="n" style="color: #333;">arityTypeArity</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Arity</span></span>
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<pre style="margin: 0;">+<span id="LC589" class="line" lang="haskell"><span class="n" style="color: #333;">arityTypeArity</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AT</span> <span class="n" style="color: #333;">oss</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;">length</span> <span class="n" style="color: #333;">oss</span></span>
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<pre style="margin: 0;"> <span id="LC590" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC536" class="line" lang="haskell"><span class="n" style="color: #333;">maxWithArity</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</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;">ArityType</span></span>
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<pre style="margin: 0;">-<span id="LC537" class="line" lang="haskell"><span class="n" style="color: #333;">maxWithArity</span> <span class="n" style="color: #333;">at</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ABot</span> <span class="p">{})</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">at</span></span>
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<pre style="margin: 0;">-<span id="LC538" class="line" lang="haskell"><span class="n" style="color: #333;">maxWithArity</span> <span class="n" style="color: #333;">at</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="n" style="color: #333;">oss</span><span class="p">)</span> <span class="n" style="color: #333;">ar</span></span>
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<pre style="margin: 0;">-<span id="LC539" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">oss</span> <span class="p">`</span><span class="n" style="color: #333;">lengthAtLeast</span><span class="p">`</span> <span class="n" style="color: #333;">ar</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">at</span></span>
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<pre style="margin: 0;">-<span id="LC540" 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;">ATop</span> <span class="p">(</span><span class="n" style="color: #333;">take</span> <span class="n" style="color: #333;">ar</span> <span class="p">(</span><span class="n" style="color: #333;">oss</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">repeat</span> <span class="kt" style="color: #458; font-weight: 600;">NoOneShotInfo</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC591" class="line" lang="haskell"><span class="cd">-- | True <=> eta-expansion will add at least one lambda</span></span>
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592
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<pre style="margin: 0;">+<span id="LC592" class="line" lang="haskell"><span class="n" style="color: #333;">expandableArityType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC593" class="line" lang="haskell"><span class="n" style="color: #333;">expandableArityType</span> <span class="n" style="color: #333;">at</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">arityTypeArity</span> <span class="n" style="color: #333;">at</span> <span class="o" style="font-weight: 600;">/=</span> <span class="mi" style="color: #099;">0</span></span>
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<pre style="margin: 0;">+<span id="LC594" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC595" class="line" lang="haskell"><span class="cd">-- | See Note [Dead ends] in "GHC.Types.Demand".</span></span>
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596
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<pre style="margin: 0;">+<span id="LC596" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Bottom implies a dead end.</span></span>
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<pre style="margin: 0;">+<span id="LC597" class="line" lang="haskell"><span class="n" style="color: #333;">isDeadEndArityType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC598" class="line" lang="haskell"><span class="n" style="color: #333;">isDeadEndArityType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AT</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">div</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isDeadEndDiv</span> <span class="n" style="color: #333;">div</span></span>
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<pre style="margin: 0;"> <span id="LC599" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC542" class="line" lang="haskell"><span class="n" style="color: #333;">vanillaArityType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span></span>
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<pre style="margin: 0;">-<span id="LC543" class="line" lang="haskell"><span class="n" style="color: #333;">vanillaArityType</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="c1" style="color: #998; font-style: italic;">-- Totally uninformative</span></span>
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<pre style="margin: 0;">+<span id="LC600" class="line" lang="haskell"><span class="cd">-- | Expand a non-bottoming arity type so that it has at least the given arity.</span></span>
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601
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<pre style="margin: 0;">+<span id="LC601" class="line" lang="haskell"><span class="n" style="color: #333;">maxWithArity</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</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;">ArityType</span></span>
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<pre style="margin: 0;">+<span id="LC602" class="line" lang="haskell"><span class="n" style="color: #333;">maxWithArity</span> <span class="n" style="color: #333;">at</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AT</span> <span class="n" style="color: #333;">oss</span> <span class="n" style="color: #333;">div</span><span class="p">)</span> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">ar</span></span>
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603
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<pre style="margin: 0;">+<span id="LC603" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isDeadEndArityType</span> <span class="n" style="color: #333;">at</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">at</span></span>
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<pre style="margin: 0;">+<span id="LC604" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">oss</span> <span class="p">`</span><span class="n" style="color: #333;">lengthAtLeast</span><span class="p">`</span> <span class="n" style="color: #333;">ar</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">at</span></span>
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<pre style="margin: 0;">+<span id="LC605" 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;">AT</span> <span class="p">(</span><span class="n" style="color: #333;">take</span> <span class="n" style="color: #333;">ar</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">oss</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">repeat</span> <span class="kt" style="color: #458; font-weight: 600;">NoOneShotInfo</span><span class="p">)</span> <span class="n" style="color: #333;">div</span></span>
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<pre style="margin: 0;">+<span id="LC606" class="line" lang="haskell"></span>
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607
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<pre style="margin: 0;">+<span id="LC607" class="line" lang="haskell"><span class="cd">-- | Trim an arity type so that it has at most the given arity.</span></span>
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608
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<pre style="margin: 0;">+<span id="LC608" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Any excess 'OneShotInfo's are truncated to 'topDiv', even if they end in</span></span>
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<pre style="margin: 0;">+<span id="LC609" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'ABot'.</span></span>
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610
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<pre style="margin: 0;">+<span id="LC610" class="line" lang="haskell"><span class="n" style="color: #333;">minWithArity</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</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;">ArityType</span></span>
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611
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<pre style="margin: 0;">+<span id="LC611" class="line" lang="haskell"><span class="n" style="color: #333;">minWithArity</span> <span class="n" style="color: #333;">at</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AT</span> <span class="n" style="color: #333;">oss</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="n" style="color: #333;">ar</span></span>
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612
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<pre style="margin: 0;">+<span id="LC612" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">oss</span> <span class="p">`</span><span class="n" style="color: #333;">lengthAtMost</span><span class="p">`</span> <span class="n" style="color: #333;">ar</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">at</span></span>
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613
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<pre style="margin: 0;">+<span id="LC613" 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;">AT</span> <span class="p">(</span><span class="n" style="color: #333;">take</span> <span class="n" style="color: #333;">ar</span> <span class="n" style="color: #333;">oss</span><span class="p">)</span> <span class="n" style="color: #333;">topDiv</span></span>
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614
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<pre style="margin: 0;">+<span id="LC614" class="line" lang="haskell"></span>
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615
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<pre style="margin: 0;">+<span id="LC615" class="line" lang="haskell"><span class="n" style="color: #333;">takeWhileOneShot</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span></span>
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616
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<pre style="margin: 0;">+<span id="LC616" class="line" lang="haskell"><span class="n" style="color: #333;">takeWhileOneShot</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AT</span> <span class="n" style="color: #333;">oss</span> <span class="n" style="color: #333;">div</span><span class="p">)</span></span>
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617
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<pre style="margin: 0;">+<span id="LC617" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isDeadEndDiv</span> <span class="n" style="color: #333;">div</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">AT</span> <span class="p">(</span><span class="n" style="color: #333;">takeWhile</span> <span class="n" style="color: #333;">isOneShotInfo</span> <span class="n" style="color: #333;">oss</span><span class="p">)</span> <span class="n" style="color: #333;">topDiv</span></span>
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618
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<pre style="margin: 0;">+<span id="LC618" 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;">AT</span> <span class="p">(</span><span class="n" style="color: #333;">takeWhile</span> <span class="n" style="color: #333;">isOneShotInfo</span> <span class="n" style="color: #333;">oss</span><span class="p">)</span> <span class="n" style="color: #333;">div</span></span>
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619
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<pre style="margin: 0;"> <span id="LC619" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC620" class="line" lang="haskell"><span class="cd">-- | The Arity returned is the number of value args the</span></span>
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<pre style="margin: 0;"> <span id="LC621" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- expression can be applied to without doing much work</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">@@ -551,8 +626,9 @@ exprEtaExpandArity dflags e = arityType (etaExpandArityEnv dflags) e</td>
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<pre style="margin: 0;"> <span id="LC626" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC627" class="line" lang="haskell"><span class="n" style="color: #333;">getBotArity</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">Arity</span></span>
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628
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<pre style="margin: 0;"> <span id="LC628" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Arity of a divergent function</span></span>
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<pre style="margin: 0;">-<span id="LC554" class="line" lang="haskell"><span class="n" style="color: #333;">getBotArity</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ABot</span> <span class="n" style="color: #333;">n</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">n</span></span>
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555
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<pre style="margin: 0;">-<span id="LC555" class="line" lang="haskell"><span class="n" style="color: #333;">getBotArity</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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629
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<pre style="margin: 0;">+<span id="LC629" class="line" lang="haskell"><span class="n" style="color: #333;">getBotArity</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AT</span> <span class="n" style="color: #333;">oss</span> <span class="n" style="color: #333;">div</span><span class="p">)</span></span>
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630
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<pre style="margin: 0;">+<span id="LC630" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isDeadEndDiv</span> <span class="n" style="color: #333;">div</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">oss</span></span>
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<pre style="margin: 0;">+<span id="LC631" 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;">Nothing</span></span>
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<pre style="margin: 0;"> <span id="LC632" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC633" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">----------------------</span></span>
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<pre style="margin: 0;"> <span id="LC634" class="line" lang="haskell"><span class="n" style="color: #333;">findRhsArity</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</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;">CoreExpr</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;">ArityType</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">@@ -563,26 +639,26 @@ findRhsArity :: DynFlags -> Id -> CoreExpr -> Arity -> ArityType</td>
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<pre style="margin: 0;"> <span id="LC639" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- so it is safe to expand e ==> (\x1..xn. e x1 .. xn)</span></span>
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640
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<pre style="margin: 0;"> <span id="LC640" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (b) if is_bot=True, then e applied to n args is guaranteed bottom</span></span>
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<pre style="margin: 0;"> <span id="LC641" class="line" lang="haskell"><span class="n" style="color: #333;">findRhsArity</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">bndr</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">old_arity</span></span>
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566
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<pre style="margin: 0;">-<span id="LC566" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">step</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">botArityType</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC642" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="mi" style="color: #099;"><span class="idiff left">0</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">botArityType</span></span></span>
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<pre style="margin: 0;"> <span id="LC643" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We always do one step, but usually that produces a result equal to</span></span>
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<pre style="margin: 0;">-<span id="LC568" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- old_arity, and then we stop right away<span class="idiff left right"> (since arities should not</span></span></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;">-- <span class="idiff left right">decrease)</span></span></span>
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<pre style="margin: 0;">+<span id="LC644" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- old_arity, and then we stop right away<span class="idiff left right">, because old_arity is assumed</span></span></span>
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<pre style="margin: 0;">+<span id="LC645" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">to be sound. In other words, arities should never decrease.</span></span></span>
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<pre style="margin: 0;"> <span id="LC646" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Result: the common case is that there is just one iteration</span></span>
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<pre style="margin: 0;"> <span id="LC647" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC572" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span></span>
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<pre style="margin: 0;">-<span id="LC573" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;"><span class="idiff left">cur_atype</span></span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">ATop</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">oss</span></span><span class="p">)</span></span>
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574
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<pre style="margin: 0;">-<span id="LC574" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;"><span class="idiff left">length</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">oss</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">old_arity</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">cur_atyp</span>e</span></span>
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<pre style="margin: 0;">-<span id="LC575" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">go</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">cur_atyp</span>e</span></span>
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<pre style="margin: 0;">-<span id="LC576" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">ne<span class="idiff left">w_atype</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">==</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">cur_atype</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">cur_atype</span></span></span>
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577
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<pre style="margin: 0;">-<span id="LC577" 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>
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<pre style="margin: 0;">-<span id="LC578" class="line" lang="haskell"><span class="o" style="font-weight: 600;"><span class="idiff left">#</span></span><span class="kr" style="font-weight: 600;"><span class="idiff">if</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">defined</span></span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">DEBUG</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">-<span id="LC579" class="line" lang="haskell"> <span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff right">pprTrace</span></span> <span class="s" style="color: #d14;">"Exciting arity"</span></span>
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<pre style="margin: 0;">-<span id="LC580" class="line" lang="haskell"> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">vcat</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">bndr</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><+></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">cur_atype</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><+></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">new_atype</span></span></span>
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581
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<pre style="margin: 0;">-<span id="LC581" class="line" lang="haskell"> <span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rhs</span></span><span class="p"><span class="idiff right">])</span></span></span>
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582
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<pre style="margin: 0;">-<span id="LC582" class="line" lang="haskell"><span class="o" style="font-weight: 600;"><span class="idiff left">#</span></span><span class="n" style="color: #333;"><span class="idiff right">endif</span></span></span>
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583
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<pre style="margin: 0;">-<span id="LC583" class="line" lang="haskell"> <span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff">go</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">new_atype</span></span></span>
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648
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<pre style="margin: 0;">+<span id="LC648" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Int</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff right"> </span><span class="kt" style="color: #458; font-weight: 600;">ArityType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span></span>
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649
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<pre style="margin: 0;">+<span id="LC649" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="o" style="font-weight: 600;"><span class="idiff left">!</span></span><span class="n" style="color: #333;"><span class="idiff">n</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">cur_at</span></span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">AT</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">oss</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">div</span></span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC650" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;"><span class="idiff left">not</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">isDeadEndDiv</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">div</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- the "stop right away" cas</span>e</span></span>
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651
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<pre style="margin: 0;">+<span id="LC651" class="line" lang="haskell"> <span class="idiff left"> </span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">length</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">oss</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">old_arity</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">cur_at</span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- from abov</span>e</span></span>
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652
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<pre style="margin: 0;">+<span id="LC652" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">ne<span class="idiff left">xt_at</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">==</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">cur_at</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">cur_at</span></span></span>
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653
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<pre style="margin: 0;">+<span id="LC653" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">=</span></span>
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<td class="diff-line-num new new_line" data-linenumber="654" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
654
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<pre style="margin: 0;">+<span id="LC654" class="line" lang="haskell"><span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- Warn if more than 2 iterations. Why 2? See Note [Exciting arity]</span></span></span>
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655
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<pre style="margin: 0;">+<span id="LC655" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">WARN</span></span><span class="p"><span class="idiff">(</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">debugIsOn</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">&&</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">n</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">></span></span><span class="idiff"> </span><span class="mi" style="color: #099;"><span class="idiff">2</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">text</span></span> <span class="s" style="color: #d14;">"Exciting arity"</span></span>
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656
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<pre style="margin: 0;">+<span id="LC656" class="line" lang="haskell"> <span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$$</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">nest</span></span><span class="idiff"> </span><span class="mi" style="color: #099;"><span class="idiff">2</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">(</span></span></span>
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657
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<pre style="margin: 0;">+<span id="LC657" class="line" lang="haskell"> <span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">bndr</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><+></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">cur_at</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><+></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">next_at</span></span></span>
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<pre style="margin: 0;">+<span id="LC658" class="line" lang="haskell"><span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$$</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rhs</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC659" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">go</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">n</span></span><span class="o" style="font-weight: 600;"><span class="idiff">+</span></span><span class="mi" style="color: #099;"><span class="idiff">1</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">next_at</span></span></span>
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660
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<pre style="margin: 0;"> <span id="LC660" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC585" class="line" lang="haskell"> <span class="n" style="color: #333;">ne<span class="idiff left">w_atype</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">step</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">cur_atype</span></span></span>
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<pre style="margin: 0;">+<span id="LC661" class="line" lang="haskell"> <span class="n" style="color: #333;">ne<span class="idiff left">xt_at</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">step</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">cur_at</span></span></span>
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662
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<pre style="margin: 0;"> <span id="LC662" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC663" class="line" lang="haskell"> <span class="n" style="color: #333;">step</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span></span>
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<pre style="margin: 0;"> <span id="LC664" class="line" lang="haskell"> <span class="n" style="color: #333;">step</span> <span class="n" style="color: #333;">at</span> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- pprTrace "step" (ppr bndr <+> ppr at <+> ppr (arityType env rhs)) $</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">@@ -607,7 +683,7 @@ fifteen years ago! It also shows up in the code for 'rnf' on lists</td>
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<pre style="margin: 0;"> <span id="LC683" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in #4138.</span></span>
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684
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<pre style="margin: 0;"> <span id="LC684" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC685" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We do the neccessary, quite simple fixed-point iteration in 'findRhsArity',</span></span>
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<pre style="margin: 0;">-<span id="LC610" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">which assumes for a single binding <span class="idiff left right">@botArityType@</span> on the first run and iterates</span></span>
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<pre style="margin: 0;">+<span id="LC686" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">which assumes for a single binding <span class="idiff left right">'ABot'</span> on the first run and iterates</span></span>
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<pre style="margin: 0;"> <span id="LC687" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">until it finds a stable arity type. Two wrinkles</span></span>
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<pre style="margin: 0;"> <span id="LC688" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC689" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* We often have to ask (see the Case or Let case of 'arityType') whether some</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">@@ -630,6 +706,30 @@ until it finds a stable arity type. Two wrinkles</td>
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<pre style="margin: 0;"> <span id="LC706" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> by the 'am_sigs' field in 'FindRhsArity', and 'lookupSigEnv' in the Var case</span></span>
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707
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<pre style="margin: 0;"> <span id="LC707" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> of 'arityType'.</span></span>
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708
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<pre style="margin: 0;"> <span id="LC708" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC709" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Exciting Arity]</span></span>
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710
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<pre style="margin: 0;">+<span id="LC710" 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="LC711" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The fixed-point iteration in 'findRhsArity' stabilises very quickly in almost</span></span>
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712
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<pre style="margin: 0;">+<span id="LC712" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">all cases. To get notified of cases where we need an usual number of iterations,</span></span>
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713
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<pre style="margin: 0;">+<span id="LC713" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we emit a warning in debug mode, so that we can investigate and make sure that</span></span>
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714
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<pre style="margin: 0;">+<span id="LC714" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we really can't do better. It's a gross hack, but catches real bugs (#18870).</span></span>
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715
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<pre style="margin: 0;">+<span id="LC715" class="line" lang="haskell"></span>
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716
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<pre style="margin: 0;">+<span id="LC716" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Now, which number is "unusual"? We pick n > 2. Here's a pretty common and</span></span>
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717
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<pre style="margin: 0;">+<span id="LC717" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">expected example that takes two iterations and would ruin the specificity</span></span>
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718
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<pre style="margin: 0;">+<span id="LC718" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of the warning (from T18937):</span></span>
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719
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<pre style="margin: 0;">+<span id="LC719" class="line" lang="haskell"></span>
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720
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<pre style="margin: 0;">+<span id="LC720" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: [Int] -> Int -> Int</span></span>
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721
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<pre style="margin: 0;">+<span id="LC721" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f [] = id</span></span>
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722
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<pre style="margin: 0;">+<span id="LC722" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f (x:xs) = let y = sum [0..x]</span></span>
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723
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<pre style="margin: 0;">+<span id="LC723" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in \z -> f xs (y + z)</span></span>
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724
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<pre style="margin: 0;">+<span id="LC724" class="line" lang="haskell"></span>
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725
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<pre style="margin: 0;">+<span id="LC725" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Fixed-point iteration starts with arity type ⊥ for f. After the first</span></span>
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726
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<pre style="margin: 0;">+<span id="LC726" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">iteration, we get arity type \??.T, e.g. arity 2, because we unconditionally</span></span>
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727
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<pre style="margin: 0;">+<span id="LC727" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'floatIn' the let-binding (see its bottom case). After the second iteration,</span></span>
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728
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<pre style="margin: 0;">+<span id="LC728" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we get arity type \?.T, e.g. arity 1, because now we are no longer allowed</span></span>
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729
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<pre style="margin: 0;">+<span id="LC729" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to floatIn the non-cheap let-binding. Which is all perfectly benign, but</span></span>
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730
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<pre style="margin: 0;">+<span id="LC730" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">means we do two iterations (well, actually 3 'step's to detect we are stable)</span></span>
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731
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<pre style="margin: 0;">+<span id="LC731" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and don't want to emit the warning.</span></span>
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732
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<pre style="margin: 0;">+<span id="LC732" class="line" lang="haskell"></span>
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633
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733
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<pre style="margin: 0;"> <span id="LC733" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Eta expanding through dictionaries]</span></span>
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634
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734
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<pre style="margin: 0;"> <span id="LC734" 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="LC735" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If the experimental -fdicts-cheap flag is on, we eta-expand through</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">@@ -651,44 +751,45 @@ dictionary-typed expression, but that's more work.</td>
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<pre style="margin: 0;"> <span id="LC751" 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="LC752" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC753" class="line" lang="haskell"><span class="n" style="color: #333;">arityLam</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;">ArityType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span></span>
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<pre style="margin: 0;">-<span id="LC654" class="line" lang="haskell"><span class="n" style="color: #333;">arityLam</span> <span class="n" style="color: #333;">id</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="n" style="color: #333;">as</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="p">(</span><span class="n" style="color: #333;">idStateHackOneShotInfo</span> <span class="n" style="color: #333;">id</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">as</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC655" class="line" lang="haskell"><span class="n" style="color: #333;">arityLam</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ABot</span> <span class="n" style="color: #333;">n</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ABot</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="LC754" class="line" lang="haskell"><span class="n" style="color: #333;">arityLam</span> <span class="n" style="color: #333;">id</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AT</span> <span class="n" style="color: #333;">oss</span> <span class="n" style="color: #333;">div</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">AT</span> <span class="p">(</span><span class="n" style="color: #333;">idStateHackOneShotInfo</span> <span class="n" style="color: #333;">id</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">oss</span><span class="p">)</span> <span class="n" style="color: #333;">div</span></span>
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<pre style="margin: 0;"> <span id="LC755" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC756" class="line" lang="haskell"><span class="n" style="color: #333;">floatIn</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span></span>
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<pre style="margin: 0;"> <span id="LC757" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We have something like (let x = E in b),</span></span>
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<pre style="margin: 0;"> <span id="LC758" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- where b has the given arity type.</span></span>
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<pre style="margin: 0;">-<span id="LC660" class="line" lang="haskell"><span class="n" style="color: #333;">floatIn</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">_</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">ABot</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">n</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">ABot</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">n</span></span></span>
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<pre style="margin: 0;">-<span id="LC661" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">floatIn</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">True</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">ATop</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">as</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">ATop</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">as</span></span></span>
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<pre style="margin: 0;">-<span id="LC662" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">floatIn</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">False</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">ATop</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">as</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">ATop</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">takeWhile</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">isOneShotInfo</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">as</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">-<span id="LC663" class="line" lang="haskell"> <span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- If E is not cheap, keep arity only for one-shots</span></span></span>
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<pre style="margin: 0;">+<span id="LC759" class="line" lang="haskell"><span class="n" style="color: #333;">floatIn</span> <span class="n" style="color: #333;"><span class="idiff left">cheap</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">at</span></span></span>
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<pre style="margin: 0;">+<span id="LC760" class="line" lang="haskell"><span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff">|</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">isDeadEndArityType</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">at</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">||</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">cheap</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">at</span></span></span>
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<pre style="margin: 0;">+<span id="LC761" class="line" lang="haskell"><span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- If E is not cheap, keep arity only for one-shots</span></span></span>
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<pre style="margin: 0;">+<span id="LC762" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><span class="idiff left">|</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">otherwise</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">takeWhileOneShot</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">at</span></span></span>
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<pre style="margin: 0;"> <span id="LC763" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC764" class="line" lang="haskell"><span class="n" style="color: #333;">arityApp</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span></span>
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<pre style="margin: 0;"> <span id="LC765" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Processing (fun arg) where at is the ArityType of fun,</span></span>
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<pre style="margin: 0;"> <span id="LC766" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Knock off an argument and behave like 'let'</span></span>
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<pre style="margin: 0;">-<span id="LC668" class="line" lang="haskell"><span class="n" style="color: #333;">arityApp</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ABot</span> <span class="mi" style="color: #099;">0</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;">ABot</span> <span class="mi" style="color: #099;">0</span></span>
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<pre style="margin: 0;">-<span id="LC669" class="line" lang="haskell"><span class="n" style="color: #333;">arityApp</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ABot</span> <span class="n" style="color: #333;">n</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;">ABot</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="LC670" class="line" lang="haskell"><span class="n" style="color: #333;">arityApp</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;">-<span id="LC671" class="line" lang="haskell"><span class="n" style="color: #333;">arityApp</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">as</span><span class="p">))</span> <span class="n" style="color: #333;">cheap</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">floatIn</span> <span class="n" style="color: #333;">cheap</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="n" style="color: #333;">as</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC672" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC673" class="line" lang="haskell"><span class="n" style="color: #333;">andArityType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span> <span class="c1" style="color: #998; font-style: italic;">-- Used for branches of a 'case'</span></span>
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<pre style="margin: 0;">-<span id="LC674" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This is least upper bound in the ArityType lattice</span></span>
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<pre style="margin: 0;">-<span id="LC675" class="line" lang="haskell"><span class="n" style="color: #333;">andArityType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ABot</span> <span class="n" style="color: #333;">n1</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ABot</span> <span class="n" style="color: #333;">n2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ABot</span> <span class="p">(</span><span class="n" style="color: #333;">n1</span> <span class="p">`</span><span class="n" style="color: #333;">max</span><span class="p">`</span> <span class="n" style="color: #333;">n2</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Note [ABot branches: use max]</span></span>
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<pre style="margin: 0;">-<span id="LC676" class="line" lang="haskell"><span class="n" style="color: #333;">andArityType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="n" style="color: #333;">as</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ABot</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="n" style="color: #333;">as</span></span>
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<pre style="margin: 0;">-<span id="LC677" class="line" lang="haskell"><span class="n" style="color: #333;">andArityType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ABot</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="n" style="color: #333;">bs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="n" style="color: #333;">bs</span></span>
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<pre style="margin: 0;">-<span id="LC678" class="line" lang="haskell"><span class="n" style="color: #333;">andArityType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="n" style="color: #333;">as</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="n" style="color: #333;">bs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="p">(</span><span class="n" style="color: #333;">as</span> <span class="p">`</span><span class="n" style="color: #333;">combine</span><span class="p">`</span> <span class="n" style="color: #333;">bs</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC679" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Combining case branches]</span></span>
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<pre style="margin: 0;">-<span id="LC680" class="line" lang="haskell"> <span class="n" style="color: #333;">combine</span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">as</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">b</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">bs</span><span class="p">)</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;">bestOneShot</span><span class="p">`</span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">combine</span> <span class="n" style="color: #333;">as</span> <span class="n" style="color: #333;">bs</span></span>
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<pre style="margin: 0;">-<span id="LC681" class="line" lang="haskell"> <span class="n" style="color: #333;">combine</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">bs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">takeWhile</span> <span class="n" style="color: #333;">isOneShotInfo</span> <span class="n" style="color: #333;">bs</span></span>
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<pre style="margin: 0;">-<span id="LC682" class="line" lang="haskell"> <span class="n" style="color: #333;">combine</span> <span class="n" style="color: #333;">as</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;">takeWhile</span> <span class="n" style="color: #333;">isOneShotInfo</span> <span class="n" style="color: #333;">as</span></span>
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<pre style="margin: 0;">-<span id="LC683" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC684" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [ABot branches: use max]</span></span>
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<pre style="margin: 0;">-<span id="LC685" 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="LC767" class="line" lang="haskell"><span class="n" style="color: #333;">arityApp</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AT</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">oss</span><span class="p">)</span> <span class="n" style="color: #333;">div</span><span class="p">)</span> <span class="n" style="color: #333;">cheap</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">floatIn</span> <span class="n" style="color: #333;">cheap</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AT</span> <span class="n" style="color: #333;">oss</span> <span class="n" style="color: #333;">div</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC768" class="line" lang="haskell"><span class="n" style="color: #333;">arityApp</span> <span class="n" style="color: #333;">at</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">at</span></span>
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<pre style="margin: 0;">+<span id="LC769" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC770" class="line" lang="haskell"><span class="cd">-- | Least upper bound in the 'ArityType' lattice.</span></span>
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<pre style="margin: 0;">+<span id="LC771" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See the haddocks on 'ArityType' for the lattice.</span></span>
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<pre style="margin: 0;">+<span id="LC772" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC773" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Used for branches of a @case@.</span></span>
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<pre style="margin: 0;">+<span id="LC774" class="line" lang="haskell"><span class="n" style="color: #333;">andArityType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span></span>
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<pre style="margin: 0;">+<span id="LC775" class="line" lang="haskell"><span class="n" style="color: #333;">andArityType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AT</span> <span class="p">(</span><span class="n" style="color: #333;">os1</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">oss1</span><span class="p">)</span> <span class="n" style="color: #333;">div1</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AT</span> <span class="p">(</span><span class="n" style="color: #333;">os2</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">oss2</span><span class="p">)</span> <span class="n" style="color: #333;">div2</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC776" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">AT</span> <span class="n" style="color: #333;">oss'</span> <span class="n" style="color: #333;">div'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">andArityType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AT</span> <span class="n" style="color: #333;">oss1</span> <span class="n" style="color: #333;">div1</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AT</span> <span class="n" style="color: #333;">oss2</span> <span class="n" style="color: #333;">div2</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC777" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">AT</span> <span class="p">((</span><span class="n" style="color: #333;">os1</span> <span class="p">`</span><span class="n" style="color: #333;">bestOneShot</span><span class="p">`</span> <span class="n" style="color: #333;">os2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">oss'</span><span class="p">)</span> <span class="n" style="color: #333;">div'</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Combining case branches]</span></span>
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<pre style="margin: 0;">+<span id="LC778" class="line" lang="haskell"><span class="n" style="color: #333;">andArityType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AT</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">div1</span><span class="p">)</span> <span class="n" style="color: #333;">at2</span></span>
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779
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<pre style="margin: 0;">+<span id="LC779" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isDeadEndDiv</span> <span class="n" style="color: #333;">div1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">at2</span> <span class="c1" style="color: #998; font-style: italic;">-- Note [ABot branches: max arity wins]</span></span>
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780
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<pre style="margin: 0;">+<span id="LC780" 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;">takeWhileOneShot</span> <span class="n" style="color: #333;">at2</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Combining case branches]</span></span>
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<pre style="margin: 0;">+<span id="LC781" class="line" lang="haskell"><span class="n" style="color: #333;">andArityType</span> <span class="n" style="color: #333;">at1</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AT</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">div2</span><span class="p">)</span></span>
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782
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<pre style="margin: 0;">+<span id="LC782" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isDeadEndDiv</span> <span class="n" style="color: #333;">div2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">at1</span> <span class="c1" style="color: #998; font-style: italic;">-- Note [ABot branches: max arity wins]</span></span>
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783
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<pre style="margin: 0;">+<span id="LC783" 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;">takeWhileOneShot</span> <span class="n" style="color: #333;">at1</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Combining case branches]</span></span>
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784
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<pre style="margin: 0;">+<span id="LC784" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC785" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [ABot branches: max arity wins]</span></span>
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786
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<pre style="margin: 0;">+<span id="LC786" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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787
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<pre style="margin: 0;"> <span id="LC787" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider case x of</span></span>
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687
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788
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<pre style="margin: 0;"> <span id="LC788" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> True -> \x. error "urk"</span></span>
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688
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789
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<pre style="margin: 0;"> <span id="LC789" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> False -> \xy. error "urk2"</span></span>
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689
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790
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<pre style="margin: 0;"> <span id="LC790" class="line" lang="haskell"></span>
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690
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<pre style="margin: 0;">-<span id="LC690" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Remember: <span class="idiff left right">ABot n</span> means "if you apply to n args, it'll definitely diverge".</span></span>
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691
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<pre style="margin: 0;">-<span id="LC691" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So we need <span class="idiff left right">(ABot 2) for the whole thing, the /max/ of the ABot</span> arities.</span></span>
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<pre style="margin: 0;">+<span id="LC791" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Remember: <span class="idiff left right">\o1..on.⊥</span> means "if you apply to n args, it'll definitely diverge".</span></span>
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<pre style="margin: 0;">+<span id="LC792" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So we need <span class="idiff left right">\??.⊥ for the whole thing, the /max/ of both</span> arities.</span></span>
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<pre style="margin: 0;"> <span id="LC793" class="line" lang="haskell"></span>
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693
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794
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<pre style="margin: 0;"> <span id="LC794" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Combining case branches]</span></span>
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<pre style="margin: 0;"> <span id="LC795" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</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">@@ -698,15 +799,18 @@ Consider</td>
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<pre style="margin: 0;"> <span id="LC799" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> True -> z</span></span>
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699
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800
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<pre style="margin: 0;"> <span id="LC800" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> False -> \s(one-shot). e1</span></span>
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700
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801
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<pre style="margin: 0;"> <span id="LC801" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in go2 x</span></span>
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701
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<pre style="margin: 0;">-<span id="LC701" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We *really* want to eta-expand go and go2.</span></span>
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802
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<pre style="margin: 0;">+<span id="LC802" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We *really* want to respect the one-shot annotation provided by the</span></span>
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<pre style="margin: 0;">+<span id="LC803" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">user and eta-expand go and go2.</span></span>
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804
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<pre style="margin: 0;"> <span id="LC804" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">When combining the branches of the case we have</span></span>
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<pre style="margin: 0;">-<span id="LC703" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">ATop [] `andAT` ATop [OneShotLam]</span></span></span>
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<pre style="margin: 0;">-<span id="LC704" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and we want to get <span class="idiff left right">ATop [OneShotLam]. But if the inner</span></span></span>
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<pre style="margin: 0;">-<span id="LC705" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">lambda wasn't one-shot</span> we don't want to do this.</span></span>
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<pre style="margin: 0;">-<span id="LC706" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(We need a <span class="idiff left right">proper arity</span> analysis to justify that.)</span></span>
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<pre style="margin: 0;">+<span id="LC805" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">T `andAT` \1.T</span></span></span>
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<pre style="margin: 0;">+<span id="LC806" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and we want to get <span class="idiff left right">\1.T.</span></span></span>
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<pre style="margin: 0;">+<span id="LC807" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">But if the inner lambda wasn't one-shot (\?.T)</span> we don't want to do this.</span></span>
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<pre style="margin: 0;">+<span id="LC808" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(We need a <span class="idiff left right">usage</span> analysis to justify that.)</span></span>
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<pre style="margin: 0;"> <span id="LC809" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC810" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So we combine the best of the two branches, on the (slightly dodgy)</span></span>
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<pre style="margin: 0;"> <span id="LC811" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">basis that if we know one branch is one-shot, then they all must be.</span></span>
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<pre style="margin: 0;">+<span id="LC812" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Surprisingly, this means that the one-shot arity type is effectively the top</span></span>
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<pre style="margin: 0;">+<span id="LC813" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">element of the lattice.</span></span>
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<pre style="margin: 0;"> <span id="LC814" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC815" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Arity trimming]</span></span>
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<pre style="margin: 0;"> <span id="LC816" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~</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">@@ -718,16 +822,17 @@ most 1, because typeArity (Int -> F a) = 1. So we have to trim the result of</td>
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<pre style="margin: 0;"> <span id="LC822" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">calling arityType on (\x y. blah). Failing to do so, and hence breaking the</span></span>
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<pre style="margin: 0;"> <span id="LC823" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">exprArity invariant, led to #5441.</span></span>
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<pre style="margin: 0;"> <span id="LC824" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC721" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">How to trim? <span class="idiff left right">For ATop, it's easy. But we must take great care with ABot.</span></span></span>
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<pre style="margin: 0;">-<span id="LC722" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">Suppose the expression was (\x y. error "urk"), we'll get (ABot 2). We</span></span></span>
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<pre style="margin: 0;">-<span id="LC723" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">absolutely must not trim that to (ABot 1), because that claims</span> that</span></span>
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<pre style="margin: 0;">-<span id="LC724" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">((\x y. error "urk") |> co) diverges when given one argument, which it</span></span></span>
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<pre style="margin: 0;">-<span id="LC725" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">absolutely does not. And Bad Things happen if we think something returns bottom</span></span></span>
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<pre style="margin: 0;">-<span id="LC726" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">when it doesn't (#16066).</span></span>
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<pre style="margin: 0;">+<span id="LC825" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">How to trim? <span class="idiff left right">If we end in topDiv, it's easy. But we must take great care with</span></span></span>
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<pre style="margin: 0;">+<span id="LC826" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">dead ends (i.e. botDiv). Suppose the expression was (\x y. error "urk"),</span></span></span>
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<pre style="margin: 0;">+<span id="LC827" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">we'll get \??.⊥. We absolutely must not trim that to \?.⊥, because</span> that</span></span>
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<pre style="margin: 0;">+<span id="LC828" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">claims that ((\x y. error "urk") |> co) diverges when given one argument,</span></span></span>
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<pre style="margin: 0;">+<span id="LC829" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">which it absolutely does not. And Bad Things happen if we think something</span></span></span>
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<pre style="margin: 0;">+<span id="LC830" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">returns bottom </span>when it doesn't (#16066).</span></span>
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831
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<pre style="margin: 0;"> <span id="LC831" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC728" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So, do not reduce the 'n' in (ABot n); rather, switch (conservatively) to ATop.</span></span>
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<pre style="margin: 0;">+<span id="LC832" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So, if we need to trim a dead-ending arity type, switch (conservatively) to</span></span>
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<pre style="margin: 0;">+<span id="LC833" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">topDiv.</span></span>
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<pre style="margin: 0;"> <span id="LC834" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC730" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Historical note: long ago, we unconditionally switched to <span class="idiff left right">ATop</span> when we</span></span>
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<pre style="margin: 0;">+<span id="LC835" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Historical note: long ago, we unconditionally switched to <span class="idiff left right">topDiv</span> when we</span></span>
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<pre style="margin: 0;"> <span id="LC836" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">encountered a cast, but that is far too conservative: see #5475</span></span>
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<pre style="margin: 0;"> <span id="LC837" 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="LC838" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -838,25 +943,22 @@ myIsCheapApp sigs fn n_val_args = case lookupVarEnv sigs fn of</td>
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<pre style="margin: 0;"> <span id="LC943" 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;">isCheapApp</span> <span class="n" style="color: #333;">fn</span> <span class="n" style="color: #333;">n_val_args</span></span>
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839
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<pre style="margin: 0;"> <span id="LC944" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- @Just at@ means local function with @at@ as current ArityType.</span></span>
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<pre style="margin: 0;"> <span id="LC945" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Roughly approximate what 'isCheapApp' is doing.</span></span>
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<pre style="margin: 0;">-<span id="LC841" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ABot</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [isCheapApp: bottoming functions] in GHC.Core.Utils</span></span>
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842
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<pre style="margin: 0;">-<span id="LC842" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="n" style="color: #333;">oss</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">n_val_args</span> <span class="o" style="font-weight: 600;"><</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">oss</span> <span class="c1" style="color: #998; font-style: italic;">-- Essentially isWorkFreeApp</span></span>
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946
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<pre style="margin: 0;">+<span id="LC946" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AT</span> <span class="n" style="color: #333;">oss</span> <span class="n" style="color: #333;">div</span><span class="p">)</span></span>
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947
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<pre style="margin: 0;">+<span id="LC947" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isDeadEndDiv</span> <span class="n" style="color: #333;">div</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [isCheapApp: bottoming functions] in GHC.Core.Utils</span></span>
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948
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<pre style="margin: 0;">+<span id="LC948" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">n_val_args</span> <span class="o" style="font-weight: 600;"><</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">oss</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="c1" style="color: #998; font-style: italic;">-- Essentially isWorkFreeApp</span></span>
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949
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<pre style="margin: 0;">+<span id="LC949" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</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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950
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<pre style="margin: 0;"> <span id="LC950" class="line" lang="haskell"></span>
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844
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951
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<pre style="margin: 0;"> <span id="LC951" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">----------------</span></span>
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<pre style="margin: 0;"> <span id="LC952" class="line" lang="haskell"><span class="n" style="color: #333;">arityType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ArityEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span></span>
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953
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<pre style="margin: 0;"> <span id="LC953" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC954" class="line" lang="haskell"><span class="n" style="color: #333;">arityType</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Cast</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>
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848
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<pre style="margin: 0;">-<span id="LC848" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">arityType</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">e</span> <span class="kr" style="font-weight: 600;">of</span></span>
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849
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<pre style="margin: 0;">-<span id="LC849" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="n" style="color: #333;">os</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="p">(</span><span class="n" style="color: #333;">take</span> <span class="n" style="color: #333;">co_arity</span> <span class="n" style="color: #333;">os</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Arity trimming]</span></span>
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850
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<pre style="margin: 0;">-<span id="LC850" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ABot</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">co_arity</span> <span class="o" style="font-weight: 600;"><</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="p">(</span><span class="n" style="color: #333;">replicate</span> <span class="n" style="color: #333;">co_arity</span> <span class="n" style="color: #333;">noOneShotInfo</span><span class="p">)</span></span>
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851
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<pre style="margin: 0;">-<span id="LC851" 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;">ABot</span> <span class="n" style="color: #333;">n</span></span>
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955
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<pre style="margin: 0;">+<span id="LC955" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">minWithArity</span> <span class="p">(</span><span class="n" style="color: #333;">arityType</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="n" style="color: #333;">co_arity</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Arity trimming]</span></span>
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852
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956
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<pre style="margin: 0;"> <span id="LC956" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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853
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957
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<pre style="margin: 0;"> <span id="LC957" class="line" lang="haskell"> <span class="n" style="color: #333;">co_arity</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">length</span> <span class="p">(</span><span class="n" style="color: #333;">typeArity</span> <span class="p">(</span><span class="n" style="color: #333;">coercionRKind</span> <span class="n" style="color: #333;">co</span><span class="p">))</span></span>
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854
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958
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<pre style="margin: 0;"> <span id="LC958" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [exprArity invariant] (2); must be true of</span></span>
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959
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<pre style="margin: 0;"> <span id="LC959" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- arityType too, since that is how we compute the arity</span></span>
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856
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960
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<pre style="margin: 0;"> <span id="LC960" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- of variables, and they in turn affect result of exprArity</span></span>
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857
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961
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<pre style="margin: 0;"> <span id="LC961" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- #5441 is a nice demo</span></span>
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<pre style="margin: 0;">-<span id="LC858" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- However, do make sure that ATop -> ATop and ABot -> ABot!</span></span>
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<pre style="margin: 0;">-<span id="LC859" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Casts don't affect that part. Getting this wrong provoked #5475</span></span>
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<pre style="margin: 0;"> <span id="LC962" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC963" class="line" lang="haskell"><span class="n" style="color: #333;">arityType</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">v</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC964" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">v</span> <span class="p">`</span><span class="n" style="color: #333;">elemVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">ae_joins</span> <span class="n" style="color: #333;">env</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">@@ -887,18 +989,15 @@ arityType env (App fun arg )</td>
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989
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<pre style="margin: 0;"> <span id="LC989" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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990
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<pre style="margin: 0;"> <span id="LC990" class="line" lang="haskell"><span class="n" style="color: #333;">arityType</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Case</span> <span class="n" style="color: #333;">scrut</span> <span class="n" style="color: #333;">bndr</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">alts</span><span class="p">)</span></span>
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991
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<pre style="margin: 0;"> <span id="LC991" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">exprIsDeadEnd</span> <span class="n" style="color: #333;">scrut</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">alts</span></span>
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890
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<pre style="margin: 0;">-<span id="LC890" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">botArityType</span> <span class="c1" style="color: #998; font-style: italic;">-- Do not eta expand</span></span>
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<pre style="margin: 0;">-<span id="LC891" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Dealing with bottom (1)]</span></span>
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<pre style="margin: 0;">+<span id="LC992" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">botArityType</span> <span class="c1" style="color: #998; font-style: italic;">-- Do not eta expand. See Note [Dealing with bottom (1)]</span></span>
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993
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<pre style="margin: 0;"> <span id="LC993" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">pedanticBottoms</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Dealing with bottom (2)]</span></span>
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<pre style="margin: 0;"> <span id="LC994" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">myExprIsCheap</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">scrut</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;">idType</span> <span class="n" style="color: #333;">bndr</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC995" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">alts_type</span></span>
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<pre style="margin: 0;"> <span id="LC996" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">exprOkForSpeculation</span> <span class="n" style="color: #333;">scrut</span></span>
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<pre style="margin: 0;"> <span id="LC997" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">alts_type</span></span>
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<pre style="margin: 0;"> <span id="LC998" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC898" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="c1" style="color: #998; font-style: italic;">-- In the remaining cases we may not push</span></span>
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<pre style="margin: 0;">-<span id="LC899" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">alts_type</span> <span class="kr" style="font-weight: 600;">of</span> <span class="c1" style="color: #998; font-style: italic;">-- evaluation of the scrutinee in</span></span>
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<pre style="margin: 0;">-<span id="LC900" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="n" style="color: #333;">as</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ATop</span> <span class="p">(</span><span class="n" style="color: #333;">takeWhile</span> <span class="n" style="color: #333;">isOneShotInfo</span> <span class="n" style="color: #333;">as</span><span class="p">)</span></span>
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901
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<pre style="margin: 0;">-<span id="LC901" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ABot</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;">ATop</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;">+<span id="LC999" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="c1" style="color: #998; font-style: italic;">-- In the remaining cases we may not push</span></span>
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<pre style="margin: 0;">+<span id="LC1000" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">takeWhileOneShot</span> <span class="n" style="color: #333;">alts_type</span> <span class="c1" style="color: #998; font-style: italic;">-- evaluation of the scrutinee in</span></span>
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1001
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<pre style="margin: 0;"> <span id="LC1001" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1002
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<pre style="margin: 0;"> <span id="LC1002" class="line" lang="haskell"> <span class="n" style="color: #333;">alts_type</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr1</span> <span class="n" style="color: #333;">andArityType</span> <span class="p">[</span><span class="n" style="color: #333;">arityType</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">rhs</span> <span class="o" 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="n" style="color: #333;">rhs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">alts</span><span class="p">]</span></span>
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1003
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<pre style="margin: 0;"> <span id="LC1003" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -938,7 +1037,7 @@ arityType env (Let (Rec prs) e)</td>
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1037
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<pre style="margin: 0;"> <span id="LC1037" class="line" lang="haskell"><span class="n" style="color: #333;">arityType</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Tick</span> <span class="n" style="color: #333;">t</span> <span class="n" style="color: #333;">e</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1038" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">tickishIsCode</span> <span class="n" style="color: #333;">t</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">arityType</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">e</span></span>
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1039
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<pre style="margin: 0;"> <span id="LC1039" class="line" lang="haskell"></span>
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941
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<pre style="margin: 0;">-<span id="LC941" class="line" lang="haskell"><span class="n" style="color: #333;">arityType</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">vanilla</span>ArityType</span></span>
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<pre style="margin: 0;">+<span id="LC1040" class="line" lang="haskell"><span class="n" style="color: #333;">arityType</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">top</span>ArityType</span></span>
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<pre style="margin: 0;"> <span id="LC1041" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1042" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Eta-expansion and join points]</span></span>
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<pre style="margin: 0;"> <span id="LC1043" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</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">@@ -973,12 +1072,12 @@ So we do this:</td>
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<pre style="margin: 0;"> <span id="LC1072" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> body of the let.</span></span>
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<pre style="margin: 0;"> <span id="LC1073" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1074" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Dually, when we come to a /call/ of a join point, just no-op</span></span>
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976
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<pre style="margin: 0;">-<span id="LC976" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> by returning <span class="idiff left right">botArityType</span>, the bottom element of ArityType,</span></span>
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<pre style="margin: 0;">+<span id="LC1075" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> by returning <span class="idiff left right">ABot</span>, the bottom element of ArityType,</span></span>
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<pre style="margin: 0;"> <span id="LC1076" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> which so that: bot `andArityType` x = x</span></span>
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<pre style="margin: 0;"> <span id="LC1077" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1078" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* This works if the join point is bound in the expression we are</span></span>
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<pre style="margin: 0;"> <span id="LC1079" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> taking the arityType of. But if it's bound further out, it makes</span></span>
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<pre style="margin: 0;">-<span id="LC981" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> no sense to say that (say) the arityType of (j False) is ABot<span class="idiff left right"> 0</span>.</span></span>
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<pre style="margin: 0;">+<span id="LC1080" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> no sense to say that (say) the arityType of (j False) is ABot.</span></span>
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<pre style="margin: 0;"> <span id="LC1081" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Bad things happen. So we keep track of the in-scope join-point Ids</span></span>
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<pre style="margin: 0;"> <span id="LC1082" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in ae_join.</span></span>
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<pre style="margin: 0;"> <span id="LC1083" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -997,12 +1096,12 @@ idArityType :: Id -> ArityType</td>
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<pre style="margin: 0;"> <span id="LC1096" class="line" lang="haskell"><span class="n" style="color: #333;">idArityType</span> <span class="n" style="color: #333;">v</span></span>
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<pre style="margin: 0;"> <span id="LC1097" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">strict_sig</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">idStrictness</span> <span class="n" style="color: #333;">v</span></span>
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<pre style="margin: 0;"> <span id="LC1098" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">not</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">isTopSig</span> <span class="n" style="color: #333;">strict_sig</span></span>
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<pre style="margin: 0;">-<span id="LC1000" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">ds</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">res</span></span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitStrictSig</span> <span class="n" style="color: #333;">strict_sig</span></span>
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<pre style="margin: 0;">+<span id="LC1099" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">ds</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">div</span></span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitStrictSig</span> <span class="n" style="color: #333;">strict_sig</span></span>
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<pre style="margin: 0;"> <span id="LC1100" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">arity</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">ds</span></span>
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<pre style="margin: 0;">-<span id="LC1002" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><span class="idiff left">=</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">if</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">isDeadEndDiv</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">res</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">then</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">ABot</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">arity</span></span></span>
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<pre style="margin: 0;">-<span id="LC1003" class="line" lang="haskell"> <span class="idiff left"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">else</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">ATop</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">take</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">arity</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">one_shots</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC1101" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">-- Every strictness signature admits an arity signature!</span></span></span>
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<pre style="margin: 0;">+<span id="LC1102" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><span class="idiff left">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">AT</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">take</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">arity</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">one_shots</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">div</span></span></span>
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1103
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<pre style="margin: 0;"> <span id="LC1103" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;">-<span id="LC1005" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">AT<span class="idiff left">op</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">take</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">idArity</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">v</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">one_shots</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC1104" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">AT</span><span class="idiff left"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">take</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">idArity</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">v</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">one_shots</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">topDiv</span></span></span>
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1105
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<pre style="margin: 0;"> <span id="LC1105" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1106
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<pre style="margin: 0;"> <span id="LC1106" class="line" lang="haskell"> <span class="n" style="color: #333;">one_shots</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">OneShotInfo</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- One-shot-ness derived from the type</span></span>
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1008
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1107
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<pre style="margin: 0;"> <span id="LC1107" class="line" lang="haskell"> <span class="n" style="color: #333;">one_shots</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">typeArity</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">v</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">@@ -1111,13 +1210,13 @@ Consider</td>
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1210
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<pre style="margin: 0;"> <span id="LC1210" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> foo = \x. case x of</span></span>
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1112
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1211
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<pre style="margin: 0;"> <span id="LC1211" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> True -> (\s{os}. blah) |> co</span></span>
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1113
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1212
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<pre style="margin: 0;"> <span id="LC1212" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> False -> wubble</span></span>
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1114
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<pre style="margin: 0;">-<span id="LC1114" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We'll get an ArityType for foo of <span class="idiff left right">(ATop [NoOneShot,OneShot])</span>.</span></span>
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1213
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<pre style="margin: 0;">+<span id="LC1213" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We'll get an ArityType for foo of <span class="idiff left right">\?1.T</span>.</span></span>
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1115
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1214
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<pre style="margin: 0;"> <span id="LC1214" class="line" lang="haskell"></span>
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1116
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<pre style="margin: 0;"> <span id="LC1215" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Then we want to eta-expand to</span></span>
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1117
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<pre style="margin: 0;"> <span id="LC1216" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> foo = \x. (\eta{os}. (case x of ...as before...) eta) |> some_co</span></span>
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1118
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1217
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<pre style="margin: 0;"> <span id="LC1217" class="line" lang="haskell"></span>
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1119
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<pre style="margin: 0;"> <span id="LC1218" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">That 'eta' binder is fresh, and we really want it to have the</span></span>
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1120
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<pre style="margin: 0;">-<span id="LC1120" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">one-shot flag from the inner \s{os<span class="idiff left right">f</span>}. By expanding with the</span></span>
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<pre style="margin: 0;">+<span id="LC1219" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">one-shot flag from the inner \s{os}. By expanding with the</span></span>
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<pre style="margin: 0;"> <span id="LC1220" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">ArityType gotten from analysing the RHS, we achieve this neatly.</span></span>
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<pre style="margin: 0;"> <span id="LC1221" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1222" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This makes a big difference to the one-shot monad trick;</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">@@ -1137,8 +1236,8 @@ see Note [The one-shot state monad trick] in GHC.Utils.Monad.</td>
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<pre style="margin: 0;"> <span id="LC1236" class="line" lang="haskell"><span class="n" style="color: #333;">etaExpand</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;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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<pre style="margin: 0;"> <span id="LC1237" class="line" lang="haskell"><span class="n" style="color: #333;">etaExpandAT</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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<pre style="margin: 0;"> <span id="LC1238" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1140" class="line" lang="haskell"><span class="n" style="color: #333;">etaExpand</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">orig_expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eta_expand</span> <span class="p">(</span><span class="n" style="color: #333;">replicate</span> <span class="n" style="color: #333;">n</span> <span class="kt" style="color: #458; font-weight: 600;">NoOneShotInfo</span><span class="p">)</span> <span class="n" style="color: #333;">orig_expr</span></span>
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<pre style="margin: 0;">-<span id="LC1141" class="line" lang="haskell"><span class="n" style="color: #333;">etaExpandAT</span> <span class="n" style="color: #333;"><span class="idiff left">at</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">orig_expr</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">eta_expand</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">arityTypeOneShots</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">at</span></span><span class="p"><span class="idiff right">)</span></span> <span class="n" style="color: #333;">orig_expr</span></span>
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<pre style="margin: 0;">+<span id="LC1239" class="line" lang="haskell"><span class="n" style="color: #333;">etaExpand</span> <span class="n" style="color: #333;">n</span> <span class="idiff left right"> </span><span class="n" style="color: #333;">orig_expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eta_expand</span> <span class="p">(</span><span class="n" style="color: #333;">replicate</span> <span class="n" style="color: #333;">n</span> <span class="kt" style="color: #458; font-weight: 600;">NoOneShotInfo</span><span class="p">)</span> <span class="n" style="color: #333;">orig_expr</span></span>
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<pre style="margin: 0;">+<span id="LC1240" class="line" lang="haskell"><span class="n" style="color: #333;">etaExpandAT</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">AT</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">oss</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">orig_expr</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">eta_expand</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">oss</span></span><span class="idiff right"> </span> <span class="n" style="color: #333;">orig_expr</span></span>
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<pre style="margin: 0;"> <span id="LC1241" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Eta expansion with ArityType]</span></span>
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<pre style="margin: 0;"> <span id="LC1242" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1243" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- etaExpand arity e = res</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/6d868f11fe4c3c4f1892c22780d8742fb8a5e356...ff98c9f1d91fc04378308f78d682b0f95bbe29ce#f168a93cde5e2aec2441d6331dfe500172df4af3"><strong>compiler/GHC/Core/Opt/Simplify.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">@@ -42,14 +42,14 @@ import GHC.Core</td>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Builtin.Types.Prim</span><span class="p">(</span> <span class="n" style="color: #333;">realWorldStatePrimTy</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Builtin.Names</span><span class="p">(</span> <span class="n" style="color: #333;">runRWKey</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Demand</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</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="nf" style="color: #900; font-weight: 600;">dmdTypeDepth</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isStrictDmd</span></span>
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<pre style="margin: 0;">-<span id="LC45" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkClosedStrictSig</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;">seqDmd</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left right">bot</span>Div</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC45" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkClosedStrictSig</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;">seqDmd</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left right">isDeadEnd</span>Div</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Cpr</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">mkCprSig</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">botCpr</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Ppr</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">pprCoreExpr</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Unique</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">hasKey</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Unfold</span></span>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Unfold.Make</span></span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Utils</span></span>
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<pre style="margin: 0;">-<span id="LC52" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Opt.Arity</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)<span class="idiff left">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">arityTypeArity</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">isBotArityType</span></span></span>
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<pre style="margin: 0;">+<span id="LC52" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Opt.Arity</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">ArityType</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pushCoTyArg</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pushCoValArg</span></span>
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">idArityType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">etaExpandAT</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.SimpleOpt</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">exprIsConApp_maybe</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">joinPointBinding_maybe</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">joinPointBindings_maybe</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">@@ -796,8 +796,8 @@ addLetBndrInfo :: OutId -> ArityType -> Unfolding -> OutId</td>
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<pre style="margin: 0;"> <span id="LC796" class="line" lang="haskell"><span class="n" style="color: #333;">addLetBndrInfo</span> <span class="n" style="color: #333;">new_bndr</span> <span class="n" style="color: #333;">new_arity_type</span> <span class="n" style="color: #333;">new_unf</span></span>
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<pre style="margin: 0;"> <span id="LC797" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">new_bndr</span> <span class="p">`</span><span class="n" style="color: #333;">setIdInfo</span><span class="p">`</span> <span class="n" style="color: #333;">info5</span></span>
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798
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798
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<pre style="margin: 0;"> <span id="LC798" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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799
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<pre style="margin: 0;">-<span id="LC799" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">new_arity</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">arityTypeArity</span></span> <span class="n" style="color: #333;">new_arity_type</span></span>
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800
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<pre style="margin: 0;">-<span id="LC800" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">is_bot</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">isBotArityType</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">new_arity_type</span></span></span>
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<pre style="margin: 0;">+<span id="LC799" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">AT</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">oss</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">div</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">=</span></span> <span class="n" style="color: #333;">new_arity_type</span></span>
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<pre style="margin: 0;">+<span id="LC800" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">new_arity</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">length</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">oss</span></span></span>
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<pre style="margin: 0;"> <span id="LC801" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC802" class="line" lang="haskell"> <span class="n" style="color: #333;">info1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">idInfo</span> <span class="n" style="color: #333;">new_bndr</span> <span class="p">`</span><span class="n" style="color: #333;">setArityInfo</span><span class="p">`</span> <span class="n" style="color: #333;">new_arity</span></span>
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<pre style="margin: 0;"> <span id="LC803" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -816,11 +816,11 @@ addLetBndrInfo new_bndr new_arity_type new_unf</td>
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<pre style="margin: 0;"> <span id="LC816" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">info2</span></span>
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<pre style="margin: 0;"> <span id="LC817" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC818" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Bottoming bindings: see Note [Bottoming bindings]</span></span>
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<pre style="margin: 0;">-<span id="LC819" class="line" lang="haskell"> <span class="n" style="color: #333;">info4</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">is<span class="idiff left">_bot</span></span><span class="idiff right"> </span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">info3</span> <span class="p">`</span><span class="n" style="color: #333;">setStrictnessInfo</span><span class="p">`</span> <span class="n" style="color: #333;">bot_sig</span></span>
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<pre style="margin: 0;">-<span id="LC820" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">setCprInfo</span><span class="p">`</span> <span class="n" style="color: #333;">bot_cpr</span></span>
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<pre style="margin: 0;">-<span id="LC821" 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;">info3</span></span>
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<pre style="margin: 0;">+<span id="LC819" class="line" lang="haskell"> <span class="n" style="color: #333;">info4</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">is<span class="idiff left">DeadEndDiv</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">div</span></span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">info3</span> <span class="p">`</span><span class="n" style="color: #333;">setStrictnessInfo</span><span class="p">`</span> <span class="n" style="color: #333;">bot_sig</span></span>
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<pre style="margin: 0;">+<span id="LC820" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="p">`</span><span class="n" style="color: #333;">setCprInfo</span><span class="p">`</span> <span class="n" style="color: #333;">bot_cpr</span></span>
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<pre style="margin: 0;">+<span id="LC821" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">info3</span></span>
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822
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<pre style="margin: 0;"> <span id="LC822" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC823" class="line" lang="haskell"> <span class="n" style="color: #333;">bot_sig</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkClosedStrictSig</span> <span class="p">(</span><span class="n" style="color: #333;">replicate</span> <span class="n" style="color: #333;">new_arity</span> <span class="n" style="color: #333;">topDmd</span><span class="p">)</span> <span class="n" style="color: #333;"><span class="idiff left right">botD</span>iv</span></span>
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<pre style="margin: 0;">+<span id="LC823" class="line" lang="haskell"> <span class="n" style="color: #333;">bot_sig</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkClosedStrictSig</span> <span class="p">(</span><span class="n" style="color: #333;">replicate</span> <span class="n" style="color: #333;">new_arity</span> <span class="n" style="color: #333;">topDmd</span><span class="p">)</span> <span class="n" style="color: #333;"><span class="idiff left right">d</span>iv</span></span>
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<pre style="margin: 0;"> <span id="LC824" class="line" lang="haskell"> <span class="n" style="color: #333;">bot_cpr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkCprSig</span> <span class="n" style="color: #333;">new_arity</span> <span class="n" style="color: #333;">botCpr</span></span>
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<pre style="margin: 0;"> <span id="LC825" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC826" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Zap call arity info. We have used it by now (via</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/6d868f11fe4c3c4f1892c22780d8742fb8a5e356...ff98c9f1d91fc04378308f78d682b0f95bbe29ce#48fbb5cdea308650de5756521feb28ec68819b9b"><strong>compiler/GHC/Core/Opt/Simplify/Utils.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">@@ -1662,8 +1662,8 @@ tryEtaExpandRhs mode bndr rhs</td>
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<pre style="margin: 0;"> <span id="LC1662" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">join_arity</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isJoinId_maybe</span> <span class="n" style="color: #333;">bndr</span></span>
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1663
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<pre style="margin: 0;"> <span id="LC1663" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">join_bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">join_body</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">collectNBinders</span> <span class="n" style="color: #333;">join_arity</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;"> <span id="LC1664" class="line" lang="haskell"> <span class="n" style="color: #333;">oss</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="n" style="color: #333;">idOneShotInfo</span> <span class="n" style="color: #333;">id</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">id</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">join_bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">isId</span> <span class="n" style="color: #333;">id</span><span class="p">]</span></span>
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1665
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<pre style="margin: 0;">-<span id="LC1665" class="line" lang="haskell"> <span class="n" style="color: #333;">arity_type</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">exprIsDeadEnd</span> <span class="n" style="color: #333;">join_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">ABot</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">length</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">oss</span></span><span class="p"><span class="idiff right">)</span></span></span>
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1666
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<pre style="margin: 0;">-<span id="LC1666" 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;"><span class="idiff left right">ATop</span></span> <span class="n" style="color: #333;">oss</span></span>
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<pre style="margin: 0;">+<span id="LC1665" class="line" lang="haskell"> <span class="n" style="color: #333;">arity_type</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">exprIsDeadEnd</span> <span class="n" style="color: #333;">join_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left">mkBotArityType</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">oss</span></span></span>
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<pre style="margin: 0;">+<span id="LC1666" 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;"><span class="idiff left right">mkTopArityType</span></span> <span class="n" style="color: #333;">oss</span></span>
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<pre style="margin: 0;"> <span id="LC1667" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">arity_type</span><span class="p">,</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1668" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Do not eta-expand join points]</span></span>
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<pre style="margin: 0;"> <span id="LC1669" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- But do return the correct arity and bottom-ness, because</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/6d868f11fe4c3c4f1892c22780d8742fb8a5e356...ff98c9f1d91fc04378308f78d682b0f95bbe29ce#f4d25a96cf3db4c0e06615b13bb644bf49697809"><strong>testsuite/tests/arityanal/should_compile/T18870.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;">{-# OPTIONS_GHC -O2 -fforce-recomp #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18870</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Exts</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This function should not lead to an "Exciting arity" DEBUG message.</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- It should only do one round of fixed-point iteration to conclude that it has</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- arity 2.</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</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="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="n" style="color: #333;">f</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;">id</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">xs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">oneShot</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="n" style="color: #333;">f</span> <span class="n" style="color: #333;">xs</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/6d868f11fe4c3c4f1892c22780d8742fb8a5e356...ff98c9f1d91fc04378308f78d682b0f95bbe29ce#59e980235f621b2b9fa27b8f5197c0c6d2555045"><strong>testsuite/tests/arityanal/should_compile/T18937.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;">{-# OPTIONS_GHC -O2 -fforce-recomp #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18937</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="n" style="color: #333;">f</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 class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="n" style="color: #333;">f</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;">id</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="n" style="color: #333;">f</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;">xs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sum</span> <span class="p">[</span><span class="mi" style="color: #099;">0</span><span class="o" style="font-weight: 600;">..</span><span class="n" style="color: #333;">x</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">z</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">xs</span> <span class="p">(</span><span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">+</span> <span class="n" style="color: #333;">z</span><span class="p">)</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/6d868f11fe4c3c4f1892c22780d8742fb8a5e356...ff98c9f1d91fc04378308f78d682b0f95bbe29ce#d67c329c07c6c486d54ae87ffc8be9188c198bcc"><strong>testsuite/tests/arityanal/should_compile/all.T</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -19,3 +19,5 @@ test('Arity16', [ only_ways(['optasm']), grep_errmsg('Arity=') ], compile, ['-dn</td>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="perl"></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="perl"><span class="c1" style="color: #998; font-style: italic;"># Regression tests</span></span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18793</span><span class="p">',</span> <span class="p">[</span> <span class="nv" style="color: #008080;">only_ways</span><span class="p">(['</span><span class="s1" style="color: #d14;">optasm</span><span class="p">']),</span> <span class="nv" style="color: #008080;">grep_errmsg</span><span class="p">('</span><span class="s1" style="color: #d14;">Arity=</span><span class="p">')</span> <span class="p">],</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">-dno-typeable-binds -ddump-simpl -dppr-cols=99999 -dsuppress-uniques</span><span class="p">'])</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18870</span><span class="p">',</span> <span class="p">[</span> <span class="nv" style="color: #008080;">only_ways</span><span class="p">(['</span><span class="s1" style="color: #d14;">optasm</span><span class="p">'])</span> <span class="p">],</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">-ddebug-output</span><span class="p">'])</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18937</span><span class="p">',</span> <span class="p">[</span> <span class="nv" style="color: #008080;">only_ways</span><span class="p">(['</span><span class="s1" style="color: #d14;">optasm</span><span class="p">'])</span> <span class="p">],</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">-ddebug-output</span><span class="p">'])</span></span></pre>
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