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<h3>
Andreas Klebinger pushed to branch wip/andreask/inlineable_mapAccumLM
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8339d4aa2ffb46e5b6d3d04e52c9b012352bb444">8339d4aa</a></strong>
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<span>by Andreas Klebinger</span>
<i>at 2020-05-27T17:29:50+02:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Optimize GHC.Utils.Monad.
Many functions in this module are recursive and as such are marked
loop breakers. Which means they are unlikely to get an unfolding.
This is *bad*. We always want to specialize them to specific Monads.
Which requires a visible unfolding at the use site.
I rewrote the recursive ones from:
foo f x = ... foo x' ...
to
foo f x = go x
where
go x = ...
As well as giving some pragmas to make all of them available
for specialization.
The end result is a reduction of allocations of about -1.4% for
nofib/spectral/simple/Main.hs when compiled with `-O`.
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<h4>1 changed file:</h4>
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<a href="#cb4ad425e8ed846dfcc5d3793b08b95f6864e545">
compiler/GHC/Utils/Monad.hs
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<h4>Changes:</h4>
<li id="cb4ad425e8ed846dfcc5d3793b08b95f6864e545">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8339d4aa2ffb46e5b6d3d04e52c9b012352bb444#cb4ad425e8ed846dfcc5d3793b08b95f6864e545"><strong>compiler/GHC/Utils/Monad.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">@@ -138,22 +138,32 @@ mapAndUnzip5M :: Monad m => (a -> m (b,c,d,e,f)) -> [a] -> m ([b],[c],[d],[e],[f</td>
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<pre style="margin: 0;"> <span id="LC138" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Inline @mapAndUnzipNM@ functions] above.</span></span>
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<pre style="margin: 0;"> <span id="LC139" class="line" lang="haskell"><span class="n" style="color: #333;">mapAndUnzip5M</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">xs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unzip5</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">traverse</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">xs</span></span>
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<pre style="margin: 0;"> <span id="LC140" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC141" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- TODO: mapAccumLM is used in many places. Surely most of</span></span>
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<pre style="margin: 0;">+<span id="LC142" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- these don't actually want to be lazy. We should add a strict</span></span>
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<pre style="margin: 0;">+<span id="LC143" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- variant and use it where appropriate.</span></span>
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<pre style="margin: 0;">+<span id="LC144" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC145" class="line" lang="haskell"><span class="cd">-- | Monadic version of mapAccumL</span></span>
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<pre style="margin: 0;">+<span id="LC146" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINEABLE mapAccumLM #-}</span></span>
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<pre style="margin: 0;"> <span id="LC147" class="line" lang="haskell"><span class="n" style="color: #333;">mapAccumLM</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Monad</span> <span class="n" style="color: #333;">m</span></span>
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<pre style="margin: 0;"> <span id="LC148" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=></span> <span class="p">(</span><span class="n" style="color: #333;">acc</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m</span> <span class="p">(</span><span class="n" style="color: #333;">acc</span><span class="p">,</span> <span class="n" style="color: #333;">y</span><span class="p">))</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ combining function</span></span>
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<pre style="margin: 0;"> <span id="LC149" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">acc</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ initial state</span></span>
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<pre style="margin: 0;"> <span id="LC150" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">x</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ inputs</span></span>
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<pre style="margin: 0;"> <span id="LC151" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m</span> <span class="p">(</span><span class="n" style="color: #333;">acc</span><span class="p">,</span> <span class="p">[</span><span class="n" style="color: #333;">y</span><span class="p">])</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ final state, outputs</span></span>
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<pre style="margin: 0;">-<span id="LC147" class="line" lang="haskell"><span class="n" style="color: #333;">mapAccumLM</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">s</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;">return</span> <span class="p">(</span><span class="n" style="color: #333;">s</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC148" class="line" lang="haskell"><span class="n" style="color: #333;">mapAccumLM</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">s</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;">do</span></span>
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<pre style="margin: 0;">-<span id="LC149" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">s1</span><span class="p">,</span> <span class="n" style="color: #333;">x'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">s</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">-<span id="LC150" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">s2</span><span class="p">,</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;">mapAccumLM</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">s1</span> <span class="n" style="color: #333;">xs</span></span>
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<pre style="margin: 0;">-<span id="LC151" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">s2</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>
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<pre style="margin: 0;">+<span id="LC152" class="line" lang="haskell"><span class="n" style="color: #333;">mapAccumLM</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">s</span> <span class="n" style="color: #333;">xs</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC153" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">s</span> <span class="n" style="color: #333;">xs</span></span>
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<pre style="margin: 0;">+<span id="LC154" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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155
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<pre style="margin: 0;">+<span id="LC155" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">s</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;">do</span></span>
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156
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<pre style="margin: 0;">+<span id="LC156" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">s1</span><span class="p">,</span> <span class="n" style="color: #333;">x'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">s</span> <span class="n" style="color: #333;">x</span></span>
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157
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<pre style="margin: 0;">+<span id="LC157" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">s2</span><span class="p">,</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;">go</span> <span class="n" style="color: #333;">s1</span> <span class="n" style="color: #333;">xs</span></span>
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158
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<pre style="margin: 0;">+<span id="LC158" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">s2</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>
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159
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<pre style="margin: 0;">+<span id="LC159" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">s</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;">return</span> <span class="p">(</span><span class="n" style="color: #333;">s</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC160" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC161" class="line" lang="haskell"><span class="cd">-- | Monadic version of mapSnd</span></span>
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<pre style="margin: 0;"> <span id="LC162" class="line" lang="haskell"><span class="n" style="color: #333;">mapSndM</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Monad</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=></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;">m</span> <span class="n" style="color: #333;">c</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;">b</span><span class="p">)]</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m</span> <span class="p">[(</span><span class="n" style="color: #333;">a</span><span class="p">,</span><span class="n" style="color: #333;">c</span><span class="p">)]</span></span>
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<pre style="margin: 0;">-<span id="LC155" class="line" lang="haskell"><span class="n" style="color: #333;">mapSndM</span> <span class="kr" style="font-weight: 600;">_</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;">return</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;">-<span id="LC156" class="line" lang="haskell"><span class="n" style="color: #333;">mapSndM</span> <span class="n" style="color: #333;">f</span> <span class="p">((</span><span class="n" style="color: #333;">a</span><span class="p">,</span><span class="n" style="color: #333;">b</span><span class="p">)</span><span 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;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">b</span><span class="p">;</span> <span class="n" style="color: #333;">rs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapSndM</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;">return</span> <span class="p">((</span><span class="n" style="color: #333;">a</span><span class="p">,</span><span class="n" style="color: #333;">c</span><span class="p">)</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">rs</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC163" class="line" lang="haskell"><span class="n" style="color: #333;">mapSndM</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">xs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">xs</span></span>
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<pre style="margin: 0;">+<span id="LC164" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC165" class="line" lang="haskell"> <span class="n" style="color: #333;">go</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;">return</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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166
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<pre style="margin: 0;">+<span id="LC166" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">((</span><span class="n" style="color: #333;">a</span><span class="p">,</span><span class="n" style="color: #333;">b</span><span class="p">)</span><span 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;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">b</span><span class="p">;</span> <span class="n" style="color: #333;">rs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">xs</span><span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">((</span><span class="n" style="color: #333;">a</span><span class="p">,</span><span class="n" style="color: #333;">c</span><span class="p">)</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">rs</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC167" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC168" class="line" lang="haskell"><span class="cd">-- | Monadic version of concatMap</span></span>
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<pre style="margin: 0;"> <span id="LC169" class="line" lang="haskell"><span class="n" style="color: #333;">concatMapM</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Monad</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=></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;">m</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="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;">m</span> <span class="p">[</span><span class="n" style="color: #333;">b</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">@@ -176,15 +186,19 @@ fmapEitherM _ fr (Right b) = fr b >>= (return . Right)</td>
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<pre style="margin: 0;"> <span id="LC186" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC187" class="line" lang="haskell"><span class="cd">-- | Monadic version of 'any', aborts the computation at the first @True@ value</span></span>
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178
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<pre style="margin: 0;"> <span id="LC188" class="line" lang="haskell"><span class="n" style="color: #333;">anyM</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Monad</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=></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;">m</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</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="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">-<span id="LC179" class="line" lang="haskell"><span class="n" style="color: #333;">anyM</span> <span class="kr" style="font-weight: 600;">_</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;">return</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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180
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<pre style="margin: 0;">-<span id="LC180" class="line" lang="haskell"><span class="n" style="color: #333;">anyM</span> <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;">do</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">x</span></span>
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189
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<pre style="margin: 0;">+<span id="LC189" class="line" lang="haskell"><span class="n" style="color: #333;">anyM</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">xs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">xs</span></span>
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<pre style="margin: 0;">+<span id="LC190" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC191" class="line" lang="haskell"> <span class="n" style="color: #333;">go</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;">return</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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192
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<pre style="margin: 0;">+<span id="LC192" class="line" lang="haskell"> <span class="n" style="color: #333;">go</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;">do</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">x</span></span>
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181
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<pre style="margin: 0;"> <span id="LC193" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">b</span> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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182
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<pre style="margin: 0;">-<span id="LC182" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;"><span class="idiff left">anyM</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">f</span></span> <span class="n" style="color: #333;">xs</span></span>
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<pre style="margin: 0;">+<span id="LC194" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;"><span class="idiff left right">go</span></span> <span class="n" style="color: #333;">xs</span></span>
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<pre style="margin: 0;"> <span id="LC195" class="line" lang="haskell"></span>
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184
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<pre style="margin: 0;"> <span id="LC196" class="line" lang="haskell"><span class="cd">-- | Monad version of 'all', aborts the computation at the first @False@ value</span></span>
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185
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<pre style="margin: 0;"> <span id="LC197" class="line" lang="haskell"><span class="n" style="color: #333;">allM</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Monad</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=></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;">m</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</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="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">-<span id="LC186" class="line" lang="haskell"><span class="n" style="color: #333;">allM</span> <span class="kr" style="font-weight: 600;">_</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;">return</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">-<span id="LC187" class="line" lang="haskell"><span class="n" style="color: #333;">allM</span> <span class="n" style="color: #333;">f</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;">f</span> <span class="n" style="color: #333;">b</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><span class="n" style="color: #333;">bv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">bv</span> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">allM</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">bs</span> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC198" class="line" lang="haskell"><span class="n" style="color: #333;">allM</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">bs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">bs</span></span>
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199
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<pre style="margin: 0;">+<span id="LC199" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC200" class="line" lang="haskell"> <span class="n" style="color: #333;">go</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;">return</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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201
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<pre style="margin: 0;">+<span id="LC201" class="line" lang="haskell"> <span class="n" style="color: #333;">go</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;">f</span> <span class="n" style="color: #333;">b</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><span class="n" style="color: #333;">bv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">bv</span> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">bs</span> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">)</span></span>
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188
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202
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<pre style="margin: 0;"> <span id="LC202" class="line" lang="haskell"></span>
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189
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203
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<pre style="margin: 0;"> <span id="LC203" class="line" lang="haskell"><span class="cd">-- | Monadic version of or</span></span>
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190
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204
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<pre style="margin: 0;"> <span id="LC204" class="line" lang="haskell"><span class="n" style="color: #333;">orM</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Monad</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=></span> <span class="n" style="color: #333;">m</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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