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Marge Bot pushed to branch master
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ce1bb9959e2465db1c3880f3c532ae7e1be39b41">ce1bb995</a></strong>
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<span>by Hécate</span>
<i>at 2020-11-01T08:52:08-05:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix a leak in `transpose`
This patch was authored by David Feuer <david.feuer@gmail.com>
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<h4>4 changed files:</h4>
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libraries/base/Data/OldList.hs
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libraries/base/tests/T18642.hs
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libraries/base/tests/T18642.stdout
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libraries/base/tests/all.T
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<h4>Changes:</h4>
<li id="5fbb1164b5c674e4253da7e91b14facf09746bbd">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ce1bb9959e2465db1c3880f3c532ae7e1be39b41#5fbb1164b5c674e4253da7e91b14facf09746bbd"><strong>libraries/base/Data/OldList.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">@@ -547,19 +547,57 @@ intercalate xs xss = concat (intersperse xs xss)</td>
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<pre style="margin: 0;"> <span id="LC547" 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="LC548" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- >>> transpose [[10,11],[20],[],[30,31,32]]</span></span>
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<pre style="margin: 0;"> <span id="LC549" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- [[10,20,30],[11,31],[32]]</span></span>
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<pre style="margin: 0;">-<span id="LC550" class="line" lang="haskell"><span class="n" style="color: #333;">transpose</span> <span class="idiff left right"> </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="p">[[</span><span class="n" style="color: #333;">a</span><span class="p">]]</span></span>
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<pre style="margin: 0;">-<span id="LC551" class="line" lang="haskell"><span class="n" style="color: #333;">transpose</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;">-<span id="LC552" class="line" lang="haskell"><span class="n" style="color: #333;">transpose</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">[]</span> <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">xss</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff right"> </span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">transpose</span> <span class="n" style="color: #333;">xss</span></span>
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<pre style="margin: 0;">-<span id="LC553" class="line" lang="haskell"><span class="n" style="color: #333;">transpose</span> <span class="p">((</span><span class="n" style="color: #333;">x</span><span class="o" style="font-weight: 600;"><span class="idiff left">:</span></span><span class="n" style="color: #333;"><span class="idiff">xs</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="n" style="color: #333;"><span class="idiff">xss</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="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">x</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">hds</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="n" style="color: #333;"><span class="idiff">transpose</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">xs</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">tls</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC550" class="line" lang="haskell"><span class="n" style="color: #333;">transpose</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="p">[[</span><span class="n" style="color: #333;">a</span><span class="p">]]</span></span>
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<pre style="margin: 0;">+<span id="LC551" class="line" lang="haskell"><span class="n" style="color: #333;">transpose</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;">+<span id="LC552" class="line" lang="haskell"><span class="n" style="color: #333;">transpose</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">[]</span> <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">xss</span></span><span class="p"><span class="idiff right">)</span></span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">transpose</span> <span class="n" style="color: #333;">xss</span></span>
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<pre style="margin: 0;">+<span id="LC553" class="line" lang="haskell"><span class="n" style="color: #333;">transpose</span> <span class="p">((</span><span class="n" style="color: #333;">x</span><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">xs</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="n" style="color: #333;"><span class="idiff">xss</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="n" style="color: #333;"><span class="idiff">combine</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">hds</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">xs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">tls</span></span></span>
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<pre style="margin: 0;"> <span id="LC554" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</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;">-- We tie the calculations of heads and tails together</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;">-- to prevent heads from leaking into tails and vice versa.</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;">-- unzip makes the selector thunk arrangements we need to</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;">-- ensure everything gets cleaned up properly.</span></span>
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<pre style="margin: 0;">-<span id="LC559" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">hds</span><span class="p">,</span> <span class="n" style="color: #333;">tls</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unzip</span> <span class="p">[(</span><span class="n" style="color: #333;">hd</span><span class="p">,</span> <span class="n" style="color: #333;">tl</span><span class="p">)</span> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">hd</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">tl</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">xss</span><span class="p">]</span></span>
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559
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<pre style="margin: 0;">+<span id="LC559" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">hds</span><span class="p">,</span> <span class="n" style="color: #333;">tls</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unzip</span> <span class="p">[(</span><span class="n" style="color: #333;">hd</span><span class="p">,</span> <span class="n" style="color: #333;">tl</span><span class="p">)</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">hd</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">tl</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">xss</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC560" class="line" lang="haskell"> <span class="n" style="color: #333;">combine</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">h</span> <span class="n" style="color: #333;">ys</span> <span class="n" style="color: #333;">t</span> <span class="o" style="font-weight: 600;">=</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;">h</span><span class="p">)</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">transpose</span> <span class="p">(</span><span class="n" style="color: #333;">ys</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">t</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC561" class="line" lang="haskell"> <span class="cp" style="color: #999; font-weight: 600;">{-# NOINLINE combine #-}</span></span>
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<pre style="margin: 0;">+<span id="LC562" class="line" lang="haskell"> <span class="cm" style="color: #998; font-style: italic;">{- Implementation note:</span></span>
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<pre style="margin: 0;">+<span id="LC563" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> If the bottom part of the function was written as such:</span></span>
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<pre style="margin: 0;">+<span id="LC564" class="line" lang="haskell"></span>
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565
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<pre style="margin: 0;">+<span id="LC565" 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="LC566" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> transpose ((x : xs) : xss) = (x:hds) : transpose (xs:tls)</span></span>
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567
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<pre style="margin: 0;">+<span id="LC567" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> where</span></span>
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<pre style="margin: 0;">+<span id="LC568" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (hds,tls) = hdstls</span></span>
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569
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<pre style="margin: 0;">+<span id="LC569" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> hdstls = unzip [(hd, tl) | hd : tl <- xss]</span></span>
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<pre style="margin: 0;">+<span id="LC570" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> {-# NOINLINE hdstls #-}</span></span>
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<pre style="margin: 0;">+<span id="LC571" 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="LC572" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Here are the steps that would take place:</span></span>
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573
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<pre style="margin: 0;">+<span id="LC573" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC574" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 1. We allocate a thunk, `hdstls`, representing the result of unzipping.</span></span>
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<pre style="margin: 0;">+<span id="LC575" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 2. We allocate selector thunks, `hds` and `tls`, that deconstruct `hdstls`.</span></span>
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<pre style="margin: 0;">+<span id="LC576" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 3. Install `hds` as the tail of the result head and pass `xs:tls` to</span></span>
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<pre style="margin: 0;">+<span id="LC577" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the recursive call in the result tail.</span></span>
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578
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<pre style="margin: 0;">+<span id="LC578" class="line" lang="haskell"></span>
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579
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<pre style="margin: 0;">+<span id="LC579" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Once optimised, this code would amount to:</span></span>
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<pre style="margin: 0;">+<span id="LC580" class="line" lang="haskell"></span>
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581
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<pre style="margin: 0;">+<span id="LC581" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ```</span></span>
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582
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<pre style="margin: 0;">+<span id="LC582" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> transpose ((x : xs) : xss) = (x:hds) : (let tls = snd hdstls in transpose (xs:tls))</span></span>
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583
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<pre style="margin: 0;">+<span id="LC583" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> where</span></span>
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584
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<pre style="margin: 0;">+<span id="LC584" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> hds = fst hdstls</span></span>
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585
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<pre style="margin: 0;">+<span id="LC585" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> hdstls = unzip [(hd, tl) | hd : tl <- xss]</span></span>
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586
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<pre style="margin: 0;">+<span id="LC586" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> {-# NOINLINE hdstls #-}</span></span>
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587
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<pre style="margin: 0;">+<span id="LC587" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ```</span></span>
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588
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<pre style="margin: 0;">+<span id="LC588" class="line" lang="haskell"></span>
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589
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<pre style="margin: 0;">+<span id="LC589" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> In particular, GHC does not produce the `tls` selector thunk immediately;</span></span>
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590
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<pre style="margin: 0;">+<span id="LC590" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> rather, it waits to do so until the tail of the result is actually demanded.</span></span>
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591
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<pre style="margin: 0;">+<span id="LC591" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> So when `hds` is demanded, that does not resolve `snd hdstls`; the tail of the</span></span>
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592
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<pre style="margin: 0;">+<span id="LC592" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> result keeps `hdstls` alive.</span></span>
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593
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<pre style="margin: 0;">+<span id="LC593" class="line" lang="haskell"></span>
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594
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<pre style="margin: 0;">+<span id="LC594" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> By writing `combine` and making it NOINLINE, we prevent GHC from delaying</span></span>
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595
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<pre style="margin: 0;">+<span id="LC595" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the selector thunk allocation, requiring that `hds` and `tls` are actually</span></span>
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596
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<pre style="margin: 0;">+<span id="LC596" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> allocated to be passed to `combine`.</span></span>
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597
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<pre style="margin: 0;">+<span id="LC597" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -}</span></span>
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560
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598
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<pre style="margin: 0;"> <span id="LC598" class="line" lang="haskell"></span>
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561
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599
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<pre style="margin: 0;"> <span id="LC599" class="line" lang="haskell"></span>
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562
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<pre style="margin: 0;">-<span id="LC562" class="line" lang="haskell"><span class="cd">-- | The 'partition' function takes a predicate a<span class="idiff left right"> list</span> and returns</span></span>
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600
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<pre style="margin: 0;">+<span id="LC600" class="line" lang="haskell"><span class="cd">-- | The 'partition' function takes a predicate a<span class="idiff left right">nd a list,</span> and returns</span></span>
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563
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601
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<pre style="margin: 0;"> <span id="LC601" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the pair of lists of elements which do and do not satisfy the</span></span>
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564
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602
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<pre style="margin: 0;"> <span id="LC602" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- predicate, respectively; i.e.,</span></span>
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565
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603
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<pre style="margin: 0;"> <span id="LC603" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<br>
</li>
<li id="010ef2433946c1f715a03c9241029459cc164eb1">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ce1bb9959e2465db1c3880f3c532ae7e1be39b41#010ef2433946c1f715a03c9241029459cc164eb1"><strong>libraries/base/tests/T18642.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE NumericUnderscores #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">Main</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">transpose</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">foldl'</span><span class="p">)</span></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.Stats</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">System.Exit</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="n" style="color: #333;">thingy</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[[[</span><span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="p">]]]</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="n" style="color: #333;">thingy</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span> <span class="p">[[</span><span class="mi" style="color: #099;">1</span><span class="p">],[</span><span class="mi" style="color: #099;">2</span><span class="p">]],</span> <span class="p">[[</span><span class="mi" style="color: #099;">1</span><span class="o" style="font-weight: 600;">..</span><span class="mi" style="color: #099;">10</span><span class="o" style="font-weight: 600;">^</span><span class="mi" style="color: #099;">7</span><span class="p">],</span> <span class="p">[</span><span class="mi" style="color: #099;">3</span><span class="p">]]]</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="n" style="color: #333;">thingy2</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[[[</span><span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="p">]]]</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="n" style="color: #333;">thingy2</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span> <span class="p">[[</span><span class="mi" style="color: #099;">1</span><span class="p">],[</span><span class="mi" style="color: #099;">2</span><span class="p">]],</span> <span class="p">[[</span><span class="mi" style="color: #099;">3</span><span class="p">],</span> <span class="p">[</span><span class="mi" style="color: #099;">2</span><span class="o" style="font-weight: 600;">..</span><span class="mi" style="color: #099;">10</span><span class="o" style="font-weight: 600;">^</span><span class="mi" style="color: #099;">7</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="LC13" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="n" style="color: #333;">main</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"> <span class="n" style="color: #333;">htr</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">ttr</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pure</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">transpose</span> <span class="n" style="color: #333;">thingy</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"> <span class="n" style="color: #333;">print</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">even</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">foldl'</span> <span class="p">(</span><span class="o" style="font-weight: 600;">+</span><span class="p">)</span> <span class="mi" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">head</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">tail</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">htr</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"> <span class="n" style="color: #333;">htr2</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">ttr2</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pure</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">transpose</span> <span class="n" style="color: #333;">thingy2</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"> <span class="n" style="color: #333;">print</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">even</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">foldl'</span> <span class="p">(</span><span class="o" style="font-weight: 600;">+</span><span class="p">)</span> <span class="mi" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">head</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">tail</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">head</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">ttr2</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"> <span class="n" style="color: #333;">maxLiveBytes</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">max_live_bytes</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">getRTSStats</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">maxLiveBytes</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><</span> <span class="mi" style="color: #099;">200</span><span class="n" style="color: #333;">_000</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">putStrLn</span> <span class="s" style="color: #d14;">"Test is running in the expected residency limit"</span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"> <span class="n" style="color: #333;">putStrLn</span> <span class="o" style="font-weight: 600;">$</span> <span class="s" style="color: #d14;">"Test is running with "</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">show</span> <span class="n" style="color: #333;">maxLiveBytes</span> <span class="o" style="font-weight: 600;"><></span> <span class="s" style="color: #d14;">" bytes of residency!"</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"> <span class="n" style="color: #333;">exitFailure</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ce1bb9959e2465db1c3880f3c532ae7e1be39b41#126c126dcaa4cbebe7ff4d0356f2829acf679f25"><strong>libraries/base/tests/T18642.stdout</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">True</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">True</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext">Test is running in the expected residency limit</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ce1bb9959e2465db1c3880f3c532ae7e1be39b41#b817c80cbb15890d9a6df41e91d15d7442471f3c"><strong>libraries/base/tests/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">@@ -260,3 +260,4 @@ test('T16943b', normal, compile_and_run, [''])</td>
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<pre style="margin: 0;"> <span id="LC260" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17499</span><span class="p">',</span> <span class="p">[</span><span class="nv" style="color: #008080;">collect_stats</span><span class="p">('</span><span class="s1" style="color: #d14;">bytes allocated</span><span class="p">',</span><span class="mi" style="color: #099;">5</span><span class="p">)],</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">-O -w</span><span class="p">'])</span></span>
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<pre style="margin: 0;"> <span id="LC261" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T16643</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC262" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">clamp</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">+<span id="LC263" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18642</span><span class="p">',</span> <span class="nv" style="color: #008080;">extra_run_opts</span><span class="p">('</span><span class="s1" style="color: #d14;">+RTS -T -RTS</span><span class="p">'),</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">-O2</span><span class="p">'])</span></span></pre>
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