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<h3>
Andreas Klebinger pushed to branch wip/andreask/opt_dumps
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/629628f8b8df6425e58e74ab09612fbb592a66a3">629628f8</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-11-24T20:48:45+01:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Optimize dumping of consecutive whitespace.
The naive way of putting out n characters of indent would be something
like `hPutStr hdl (replicate n ' ')`. However this is quite inefficient
as we allocate an absurd number of strings consisting of simply spaces
as we don't cache them.
To improve on this we now track if we can simply write ascii spaces via
hPutBuf instead. This is the case when running with -ddump-to-file where
we force the encoding to be UTF8.
This avoids both the cost of going through encoding as well as avoiding
allocation churn from all the white space. Instead we simply use hPutBuf
on a preallocated unlifted string.
When dumping stg like this:
> nofib/spectral/simple/Main.hs -fforce-recomp -ddump-stg-final -ddump-to-file -c +RTS -s
Allocations went from 1,778 MB to 1,702MB. About a 4% reduction of
allocation! I did not measure the difference in runtime but expect it
to be similar.
</pre>
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<h4>5 changed files:</h4>
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<li class="file-stats">
<a href="#c1ebbd8dd9934a9830cc2a4690e75465600f1554">
compiler/GHC/Driver/Ppr.hs
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<li class="file-stats">
<a href="#774d88050336ef660c7a219fb06c480c2fc639bc">
compiler/GHC/Driver/Session.hs
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<li class="file-stats">
<a href="#74503129756c368c70bd530fb0beb4292889db5e">
compiler/GHC/Utils/Error.hs
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<li class="file-stats">
<a href="#d3cf57b6a5ebc234dc7689db38ef9b6cf2259c0f">
compiler/GHC/Utils/Outputable.hs
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<li class="file-stats">
<a href="#145ad389c4a11348321b6e1cd77b27c6c7ae7b4f">
compiler/GHC/Utils/Ppr.hs
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</li>
</ul>
<h4>Changes:</h4>
<li id="c1ebbd8dd9934a9830cc2a4690e75465600f1554">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/629628f8b8df6425e58e74ab09612fbb592a66a3#c1ebbd8dd9934a9830cc2a4690e75465600f1554"><strong>compiler/GHC/Driver/Ppr.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">@@ -66,7 +66,7 @@ showSDocDebug dflags d = renderWithContext ctx d</td>
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<pre style="margin: 0;"> <span id="LC66" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC67" class="line" lang="haskell"><span class="n" style="color: #333;">printForUser</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;">Handle</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PrintUnqualified</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Depth</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC68" class="line" lang="haskell"><span class="n" style="color: #333;">printForUser</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">handle</span> <span class="n" style="color: #333;">unqual</span> <span class="n" style="color: #333;">depth</span> <span class="n" style="color: #333;">doc</span></span>
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<pre style="margin: 0;">-<span id="LC69" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">printSDocLn</span> <span class="n" style="color: #333;">ctx</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">PageMode</span></span> <span class="n" style="color: #333;">handle</span> <span class="n" style="color: #333;">doc</span></span>
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<pre style="margin: 0;">+<span id="LC69" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">printSDocLn</span> <span class="n" style="color: #333;">ctx</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">PageMode</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">False</span></span><span class="p"><span class="idiff right">)</span></span> <span class="n" style="color: #333;">handle</span> <span class="n" style="color: #333;">doc</span></span>
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<pre style="margin: 0;"> <span id="LC70" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">ctx</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">initSDocContext</span> <span class="n" style="color: #333;">dflags</span> <span class="p">(</span><span class="n" style="color: #333;">mkUserStyle</span> <span class="n" style="color: #333;">unqual</span> <span class="n" style="color: #333;">depth</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC72" class="line" lang="haskell"><span class="cd">-- | Like 'printSDocLn' but specialized with 'LeftMode' and</span></span>
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<li id="774d88050336ef660c7a219fb06c480c2fc639bc">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/629628f8b8df6425e58e74ab09612fbb592a66a3#774d88050336ef660c7a219fb06c480c2fc639bc"><strong>compiler/GHC/Driver/Session.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">@@ -1377,7 +1377,7 @@ defaultFatalMessager = hPutStrLn stderr</td>
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<pre style="margin: 0;"> <span id="LC1377" class="line" lang="haskell"><span class="n" style="color: #333;">jsonLogAction</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LogAction</span></span>
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<pre style="margin: 0;"> <span id="LC1378" class="line" lang="haskell"><span class="n" style="color: #333;">jsonLogAction</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">reason</span> <span class="n" style="color: #333;">severity</span> <span class="n" style="color: #333;">srcSpan</span> <span class="n" style="color: #333;">msg</span></span>
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<pre style="margin: 0;"> <span id="LC1379" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">-<span id="LC1380" class="line" lang="haskell"> <span class="n" style="color: #333;">defaultLogActionHPutStrDoc</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">stdout</span></span>
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<pre style="margin: 0;">+<span id="LC1380" class="line" lang="haskell"> <span class="n" style="color: #333;">defaultLogActionHPutStrDoc</span> <span class="n" style="color: #333;">dflags</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">True</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">stdout</span></span>
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<pre style="margin: 0;"> <span id="LC1381" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">withPprStyle</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PprCode</span> <span class="kt" style="color: #458; font-weight: 600;">CStyle</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">doc</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">""</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC1382" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC1383" class="line" lang="haskell"> <span class="n" style="color: #333;">str</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">renderWithContext</span> <span class="p">(</span><span class="n" style="color: #333;">initSDocContext</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">defaultUserStyle</span><span class="p">)</span> <span class="n" style="color: #333;">msg</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">@@ -1400,9 +1400,9 @@ defaultLogAction dflags reason severity srcSpan msg</td>
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1400
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<pre style="margin: 0;"> <span id="LC1400" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SevWarning</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">printWarns</span></span>
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1401
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1401
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<pre style="margin: 0;"> <span id="LC1401" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SevError</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">printWarns</span></span>
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1402
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1402
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<pre style="margin: 0;"> <span id="LC1402" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1403
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<pre style="margin: 0;">-<span id="LC1403" class="line" lang="haskell"> <span class="n" style="color: #333;">printOut</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">defaultLogActionHPrintDoc</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">stdout</span></span>
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1404
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<pre style="margin: 0;">-<span id="LC1404" class="line" lang="haskell"> <span class="n" style="color: #333;">printErrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">defaultLogActionHPrintDoc</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">stderr</span></span>
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1405
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<pre style="margin: 0;">-<span id="LC1405" class="line" lang="haskell"> <span class="n" style="color: #333;">putStrSDoc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">defaultLogActionHPutStrDoc</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">stdout</span></span>
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1403
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<pre style="margin: 0;">+<span id="LC1403" class="line" lang="haskell"> <span class="n" style="color: #333;">printOut</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">defaultLogActionHPrintDoc</span> <span class="n" style="color: #333;">dflags</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">False</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">stdout</span></span>
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<pre style="margin: 0;">+<span id="LC1404" class="line" lang="haskell"> <span class="n" style="color: #333;">printErrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">defaultLogActionHPrintDoc</span> <span class="n" style="color: #333;">dflags</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">False</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">stderr</span></span>
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<pre style="margin: 0;">+<span id="LC1405" class="line" lang="haskell"> <span class="n" style="color: #333;">putStrSDoc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">defaultLogActionHPutStrDoc</span> <span class="n" style="color: #333;">dflags</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">False</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">stdout</span></span>
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1406
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<pre style="margin: 0;"> <span id="LC1406" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Pretty print the warning flag, if any (#10752)</span></span>
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1407
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<pre style="margin: 0;"> <span id="LC1407" class="line" lang="haskell"> <span class="n" style="color: #333;">message</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkLocMessageAnn</span> <span class="n" style="color: #333;">flagMsg</span> <span class="n" style="color: #333;">severity</span> <span class="n" style="color: #333;">srcSpan</span> <span class="n" style="color: #333;">msg</span></span>
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1408
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1408
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<pre style="margin: 0;"> <span id="LC1408" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1442" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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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">@@ -1442,16 +1442,19 @@ defaultLogAction dflags reason severity srcSpan msg</td>
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<pre style="margin: 0;"> <span id="LC1442" 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="s" style="color: #d14;">""</span></span>
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<pre style="margin: 0;"> <span id="LC1443" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1444" class="line" lang="haskell"><span class="cd">-- | Like 'defaultLogActionHPutStrDoc' but appends an extra newline.</span></span>
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1445
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<pre style="margin: 0;">-<span id="LC1445" class="line" lang="haskell"><span class="n" style="color: #333;">defaultLogActionHPrintDoc</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;">Handle</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1446
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<pre style="margin: 0;">-<span id="LC1446" class="line" lang="haskell"><span class="n" style="color: #333;">defaultLogActionHPrintDoc</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">h</span> <span class="n" style="color: #333;">d</span></span>
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1447
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<pre style="margin: 0;">-<span id="LC1447" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">defaultLogActionHPutStrDoc</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">h</span> <span class="p">(</span><span class="n" style="color: #333;">d</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">""</span><span class="p">)</span></span>
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1448
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<pre style="margin: 0;">-<span id="LC1448" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1449" class="line" lang="haskell"><span class="n" style="color: #333;">defaultLogActionHPutStrDoc</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;">Handle</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">-<span id="LC1450" class="line" lang="haskell"><span class="n" style="color: #333;">defaultLogActionHPutStrDoc</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">h</span> <span class="n" style="color: #333;">d</span></span>
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<pre style="margin: 0;">+<span id="LC1445" class="line" lang="haskell"><span class="n" style="color: #333;">defaultLogActionHPrintDoc</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;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Handle</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC1446" class="line" lang="haskell"><span class="n" style="color: #333;">defaultLogActionHPrintDoc</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">asciiSpace</span> <span class="n" style="color: #333;">h</span> <span class="n" style="color: #333;">d</span></span>
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<pre style="margin: 0;">+<span id="LC1447" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">defaultLogActionHPutStrDoc</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">asciiSpace</span> <span class="n" style="color: #333;">h</span> <span class="p">(</span><span class="n" style="color: #333;">d</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">""</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1448" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1449" class="line" lang="haskell"><span class="cd">-- | The boolean arguments let's the pretty printer know if it can optimize indent</span></span>
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<pre style="margin: 0;">+<span id="LC1450" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- by writing ascii ' ' characters without going through decoding.</span></span>
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<pre style="margin: 0;">+<span id="LC1451" class="line" lang="haskell"><span class="n" style="color: #333;">defaultLogActionHPutStrDoc</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;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Handle</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC1452" class="line" lang="haskell"><span class="n" style="color: #333;">defaultLogActionHPutStrDoc</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">asciiSpace</span> <span class="n" style="color: #333;">h</span> <span class="n" style="color: #333;">d</span></span>
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<pre style="margin: 0;"> <span id="LC1453" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Don't add a newline at the end, so that successive</span></span>
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<pre style="margin: 0;"> <span id="LC1454" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- calls to this log-action can output all on the same line</span></span>
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<pre style="margin: 0;">-<span id="LC1453" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">printSDoc</span> <span class="n" style="color: #333;">ctx</span> <span class="kt" style="color: #458; font-weight: 600;">Pretty</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">PageMode</span> <span class="n" style="color: #333;">h</span> <span class="n" style="color: #333;">d</span></span>
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<pre style="margin: 0;">-<span id="LC1454" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">ctx</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">initSDocContext</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">defaultUserStyle</span></span>
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<pre style="margin: 0;">+<span id="LC1455" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">printSDoc</span> <span class="n" style="color: #333;">ctx</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Pretty</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">PageMode</span> <span class="n" style="color: #333;">asciiSpace</span><span class="p">)</span> <span class="n" style="color: #333;">h</span> <span class="n" style="color: #333;">d</span></span>
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<pre style="margin: 0;">+<span id="LC1456" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC1457" class="line" lang="haskell"> <span class="n" style="color: #333;">ctx</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">initSDocContext</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">defaultUserStyle</span></span>
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<pre style="margin: 0;"> <span id="LC1458" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1459" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">FlushOut</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FlushOut</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1460" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/629628f8b8df6425e58e74ab09612fbb592a66a3#74503129756c368c70bd530fb0beb4292889db5e"><strong>compiler/GHC/Utils/Error.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">@@ -327,7 +327,8 @@ dumpSDocWithStyle sty dflags dumpOpt hdr doc =</td>
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<pre style="margin: 0;"> <span id="LC327" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">blankLine</span></span>
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328
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<pre style="margin: 0;"> <span id="LC328" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">doc</span></span>
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<pre style="margin: 0;"> <span id="LC329" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkDumpDoc</span> <span class="n" style="color: #333;">hdr</span> <span class="n" style="color: #333;">d</span></span>
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<pre style="margin: 0;">-<span id="LC330" class="line" lang="haskell"> <span class="n" style="color: #333;">defaultLogActionHPrintDoc</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">handle</span> <span class="p">(</span><span class="n" style="color: #333;">withPprStyle</span> <span class="n" style="color: #333;">sty</span> <span class="n" style="color: #333;">doc'</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC330" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- When we dump to files we use UTF8. Which allows ascii spaces.</span></span>
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<pre style="margin: 0;">+<span id="LC331" class="line" lang="haskell"> <span class="n" style="color: #333;">defaultLogActionHPrintDoc</span> <span class="n" style="color: #333;">dflags</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="n" style="color: #333;">handle</span> <span class="p">(</span><span class="n" style="color: #333;">withPprStyle</span> <span class="n" style="color: #333;">sty</span> <span class="n" style="color: #333;">doc'</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC332" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC333" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- write the dump to stdout</span></span>
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<pre style="margin: 0;"> <span id="LC334" class="line" lang="haskell"> <span class="n" style="color: #333;">writeDump</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/629628f8b8df6425e58e74ab09612fbb592a66a3#d3cf57b6a5ebc234dc7689db38ef9b6cf2259c0f"><strong>compiler/GHC/Utils/Outputable.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">@@ -563,7 +563,7 @@ pprCode cs d = withPprStyle (PprCode cs) d</td>
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563
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<pre style="margin: 0;"> <span id="LC563" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC564" class="line" lang="haskell"><span class="n" style="color: #333;">renderWithContext</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SDocContext</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">String</span></span>
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<pre style="margin: 0;"> <span id="LC565" class="line" lang="haskell"><span class="n" style="color: #333;">renderWithContext</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;">sdoc</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="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">s</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Pretty</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">style</span><span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">Pretty</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">mode</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PageMode</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="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">s</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Pretty</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">style</span><span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">Pretty</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">mode</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PageMode</span><span class="idiff left"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">False</span></span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC567" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Pretty</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">lineLength</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sdocLineLength</span> <span class="n" style="color: #333;">ctx</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC568" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="kt" style="color: #458; font-weight: 600;">Pretty</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">renderStyle</span> <span class="n" style="color: #333;">s</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">runSDoc</span> <span class="n" style="color: #333;">sdoc</span> <span class="n" style="color: #333;">ctx</span></span>
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<pre style="margin: 0;"> <span id="LC569" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/629628f8b8df6425e58e74ab09612fbb592a66a3#145ad389c4a11348321b6e1cd77b27c6c7ae7b4f"><strong>compiler/GHC/Utils/Ppr.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">@@ -917,16 +917,26 @@ data Style</td>
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<pre style="margin: 0;"> <span id="LC917" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ribbonsPerLine</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Float</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Ratio of line length to ribbon length</span></span>
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918
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<pre style="margin: 0;"> <span id="LC918" class="line" lang="haskell"> <span class="p">}</span></span>
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919
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919
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<pre style="margin: 0;"> <span id="LC919" class="line" lang="haskell"></span>
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920
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<pre style="margin: 0;">-<span id="LC920" class="line" lang="haskell"><span class="cd">-- | The default style (@mode=PageMode, lineLength=100, ribbonsPerLine=1.5@).</span></span>
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<pre style="margin: 0;">+<span id="LC920" class="line" lang="haskell"><span class="cd">-- | The default style (@mode=PageMode<span class="idiff left right"> False</span>, lineLength=100, ribbonsPerLine=1.5@).</span></span>
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<pre style="margin: 0;"> <span id="LC921" class="line" lang="haskell"><span class="n" style="color: #333;">style</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Style</span></span>
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922
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<pre style="margin: 0;">-<span id="LC922" class="line" lang="haskell"><span class="n" style="color: #333;">style</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Style</span> <span class="p">{</span> <span class="n" style="color: #333;">lineLength</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">100</span><span class="p">,</span> <span class="n" style="color: #333;">ribbonsPerLine</span> <span class="o" style="font-weight: 600;">=</span> <span class="mf" style="color: #099;">1.5</span><span class="p">,</span> <span class="n" style="color: #333;">mode</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PageMode</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC922" class="line" lang="haskell"><span class="n" style="color: #333;">style</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Style</span> <span class="p">{</span> <span class="n" style="color: #333;">lineLength</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">100</span><span class="p">,</span> <span class="n" style="color: #333;">ribbonsPerLine</span> <span class="o" style="font-weight: 600;">=</span> <span class="mf" style="color: #099;">1.5</span><span class="p">,</span> <span class="n" style="color: #333;">mode</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PageMode</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">False</span></span><span class="idiff right"> </span><span class="p">}</span></span>
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923
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923
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<pre style="margin: 0;"> <span id="LC923" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC924" class="line" lang="haskell"><span class="cd">-- | Rendering mode.</span></span>
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925
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<pre style="margin: 0;">-<span id="LC925" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Mode</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PageMode</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Normal</span></span>
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925
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<pre style="margin: 0;">+<span id="LC925" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Mode</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PageMode</span> <span class="p"><span class="idiff left">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">asciiSpace</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">Bool</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">}</span></span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Normal</span></span>
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926
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926
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<pre style="margin: 0;"> <span id="LC926" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ZigZagMode</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ With zig-zag cuts</span></span>
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927
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927
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<pre style="margin: 0;"> <span id="LC927" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">LeftMode</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ No indentation, infinitely long lines</span></span>
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928
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928
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<pre style="margin: 0;"> <span id="LC928" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">OneLineMode</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ All on one line</span></span>
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929
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929
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<pre style="margin: 0;"> <span id="LC929" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC930" class="line" lang="haskell"><span class="cd">-- | Can we output an ascii space character for spaces?</span></span>
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931
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<pre style="margin: 0;">+<span id="LC931" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Mostly true, but not for e.g. UTF16</span></span>
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932
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<pre style="margin: 0;">+<span id="LC932" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [putSpaces optimizations] for why we bother</span></span>
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933
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<pre style="margin: 0;">+<span id="LC933" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- to track this.</span></span>
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934
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<pre style="margin: 0;">+<span id="LC934" class="line" lang="haskell"><span class="n" style="color: #333;">hasAsciiSpace</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Mode</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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935
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<pre style="margin: 0;">+<span id="LC935" class="line" lang="haskell"><span class="n" style="color: #333;">hasAsciiSpace</span> <span class="n" style="color: #333;">mode</span> <span class="o" style="font-weight: 600;">=</span></span>
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936
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<pre style="margin: 0;">+<span id="LC936" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">mode</span> <span class="kr" style="font-weight: 600;">of</span></span>
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937
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<pre style="margin: 0;">+<span id="LC937" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PageMode</span> <span class="n" style="color: #333;">asciiSpace</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">asciiSpace</span></span>
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938
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<pre style="margin: 0;">+<span id="LC938" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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939
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<pre style="margin: 0;">+<span id="LC939" class="line" lang="haskell"></span>
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930
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940
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<pre style="margin: 0;"> <span id="LC940" class="line" lang="haskell"><span class="cd">-- | Render the @Doc@ to a String using the given @Style@.</span></span>
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931
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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;">renderStyle</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Style</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Doc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">String</span></span>
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932
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942
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<pre style="margin: 0;"> <span id="LC942" class="line" lang="haskell"><span class="n" style="color: #333;">renderStyle</span> <span class="n" style="color: #333;">s</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fullRender</span> <span class="p">(</span><span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">s</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">lineLength</span> <span class="n" style="color: #333;">s</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">ribbonsPerLine</span> <span class="n" style="color: #333;">s</span><span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1034" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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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">@@ -1034,6 +1044,20 @@ printDoc :: Mode -> Int -> Handle -> Doc -> IO ()</td>
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1034
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1044
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<pre style="margin: 0;"> <span id="LC1044" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- printDoc adds a newline to the end</span></span>
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1035
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1045
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<pre style="margin: 0;"> <span id="LC1045" class="line" lang="haskell"><span class="n" style="color: #333;">printDoc</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">cols</span> <span class="n" style="color: #333;">hdl</span> <span class="n" style="color: #333;">doc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">printDoc_</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">cols</span> <span class="n" style="color: #333;">hdl</span> <span class="p">(</span><span class="n" style="color: #333;">doc</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">""</span><span class="p">)</span></span>
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1036
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1046
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<pre style="margin: 0;"> <span id="LC1046" class="line" lang="haskell"></span>
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1047
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<pre style="margin: 0;">+<span id="LC1047" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [putSpaces optimizations]</span></span>
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1048
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<pre style="margin: 0;">+<span id="LC1048" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1049
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<pre style="margin: 0;">+<span id="LC1049" class="line" lang="haskell"></span>
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1050
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<pre style="margin: 0;">+<span id="LC1050" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">When using dump flags a lot of what we are dumping ends up being whitespace.</span></span>
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1051
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<pre style="margin: 0;">+<span id="LC1051" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This is especially true for Core/Stg dumps. Enough so that it's worth optimizing.</span></span>
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1052
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<pre style="margin: 0;">+<span id="LC1052" class="line" lang="haskell"></span>
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1053
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<pre style="margin: 0;">+<span id="LC1053" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Especially in the common case of writing to an UTF8 or similarly encoded file</span></span>
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1054
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<pre style="margin: 0;">+<span id="LC1054" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">where space is equal to ascii space we use hPutBuf to write a preallocated</span></span>
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1055
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<pre style="margin: 0;">+<span id="LC1055" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">buffer to the file. This avoids a fair bit of allocation.</span></span>
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1056
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<pre style="margin: 0;">+<span id="LC1056" class="line" lang="haskell"></span>
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1057
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<pre style="margin: 0;">+<span id="LC1057" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For other cases we fall back to the old and slow path for simplicity.</span></span>
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1058
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<pre style="margin: 0;">+<span id="LC1058" class="line" lang="haskell"></span>
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1059
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<pre style="margin: 0;">+<span id="LC1059" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1060
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<pre style="margin: 0;">+<span id="LC1060" class="line" lang="haskell"></span>
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1037
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1061
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<pre style="margin: 0;"> <span id="LC1061" class="line" lang="haskell"><span class="n" style="color: #333;">printDoc_</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Mode</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;">Handle</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Doc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1038
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1062
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<pre style="margin: 0;"> <span id="LC1062" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- printDoc_ does not add a newline at the end, so that</span></span>
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1039
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1063
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<pre style="margin: 0;"> <span id="LC1063" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- successive calls can output stuff on the same line</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1051" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1075" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1051,9 +1075,27 @@ printDoc_ mode pprCols hdl doc</td>
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1051
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1075
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<pre style="margin: 0;"> <span id="LC1075" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the I/O library's encoding layer. (#3398)</span></span>
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1052
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1076
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<pre style="margin: 0;"> <span id="LC1076" class="line" lang="haskell"> <span class="n" style="color: #333;">put</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ZStr</span> <span class="n" style="color: #333;">s</span><span class="p">)</span> <span class="n" style="color: #333;">next</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hPutFZS</span> <span class="n" style="color: #333;">hdl</span> <span class="n" style="color: #333;">s</span> <span class="o" style="font-weight: 600;">>></span> <span class="n" style="color: #333;">next</span></span>
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1053
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1077
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<pre style="margin: 0;"> <span id="LC1077" class="line" lang="haskell"> <span class="n" style="color: #333;">put</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LStr</span> <span class="n" style="color: #333;">s</span><span class="p">)</span> <span class="n" style="color: #333;">next</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hPutPtrString</span> <span class="n" style="color: #333;">hdl</span> <span class="n" style="color: #333;">s</span> <span class="o" style="font-weight: 600;">>></span> <span class="n" style="color: #333;">next</span></span>
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1054
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<pre style="margin: 0;">-<span id="LC1054" class="line" lang="haskell"> <span class="n" style="color: #333;">put</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RStr</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">c</span><span class="p">)</span> <span class="n" style="color: #333;">next</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hPutStr</span> <span class="n" style="color: #333;">hdl</span> <span class="p">(</span><span class="n" style="color: #333;">replicate</span> <span class="n" style="color: #333;">n</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;">next</span></span>
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1078
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<pre style="margin: 0;">+<span id="LC1078" class="line" lang="haskell"> <span class="n" style="color: #333;">put</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RStr</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">c</span><span class="p">)</span> <span class="n" style="color: #333;">next</span></span>
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1079
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<pre style="margin: 0;">+<span id="LC1079" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;">==</span> <span class="sc" style="color: #d14;">' '</span></span>
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1080
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<pre style="margin: 0;">+<span id="LC1080" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">putSpaces</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">>></span> <span class="n" style="color: #333;">next</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1081" 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">
1081
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<pre style="margin: 0;">+<span id="LC1081" 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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1082
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<pre style="margin: 0;">+<span id="LC1082" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hPutStr</span> <span class="n" style="color: #333;">hdl</span> <span class="p">(</span><span class="n" style="color: #333;">replicate</span> <span class="n" style="color: #333;">n</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;">next</span></span>
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1083
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<pre style="margin: 0;">+<span id="LC1083" class="line" lang="haskell"> <span class="n" style="color: #333;">putSpaces</span> <span class="n" style="color: #333;">n</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1084" 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">
1084
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<pre style="margin: 0;">+<span id="LC1084" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If we use ascii spaces we are allowed to use hPutBuf</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1085" 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">
1085
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<pre style="margin: 0;">+<span id="LC1085" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [putSpaces optimizations]</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1086" 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">
1086
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<pre style="margin: 0;">+<span id="LC1086" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">hasAsciiSpace</span> <span class="n" style="color: #333;">mode</span></span>
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1087
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<pre style="margin: 0;">+<span id="LC1087" class="line" lang="haskell"> <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;">100</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1088" 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">
1088
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<pre style="margin: 0;">+<span id="LC1088" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hPutBuf</span> <span class="n" style="color: #333;">hdl</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="n" style="color: #333;">spaces'</span><span class="p">)</span> <span class="n" style="color: #333;">n</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1089" 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">
1089
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<pre style="margin: 0;">+<span id="LC1089" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">hasAsciiSpace</span> <span class="n" style="color: #333;">mode</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1090" 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">
1090
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<pre style="margin: 0;">+<span id="LC1090" class="line" lang="haskell"> <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;">100</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1091" 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">
1091
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<pre style="margin: 0;">+<span id="LC1091" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hPutBuf</span> <span class="n" style="color: #333;">hdl</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="n" style="color: #333;">spaces'</span><span class="p">)</span> <span class="mi" style="color: #099;">100</span> <span class="o" style="font-weight: 600;">>></span> <span class="n" style="color: #333;">putSpaces</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;">100</span><span class="p">)</span></span>
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1092
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<pre style="margin: 0;">+<span id="LC1092" class="line" lang="haskell"></span>
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1093
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<pre style="margin: 0;">+<span id="LC1093" 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;">hPutStr</span> <span class="n" style="color: #333;">hdl</span> <span class="p">(</span><span class="n" style="color: #333;">replicate</span> <span class="n" style="color: #333;">n</span> <span class="sc" style="color: #d14;">' '</span><span class="p">)</span></span>
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1055
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1094
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<pre style="margin: 0;"> <span id="LC1094" class="line" lang="haskell"></span>
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1056
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1095
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<pre style="margin: 0;"> <span id="LC1095" class="line" lang="haskell"> <span class="n" style="color: #333;">done</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span> <span class="c1" style="color: #998; font-style: italic;">-- hPutChar hdl '\n'</span></span>
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1096
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<pre style="margin: 0;">+<span id="LC1096" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 100 spaces, so we avoid the allocation of replicate n ' '</span></span>
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1097
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<pre style="margin: 0;">+<span id="LC1097" class="line" lang="haskell"> <span class="n" style="color: #333;">spaces'</span> <span class="o" style="font-weight: 600;">=</span> <span class="s" style="color: #d14;">" "</span><span class="o" style="font-weight: 600;">#</span></span>
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1098
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<pre style="margin: 0;">+<span id="LC1098" class="line" lang="haskell"></span>
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1057
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1099
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<pre style="margin: 0;"> <span id="LC1099" class="line" lang="haskell"></span>
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1058
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1100
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<pre style="margin: 0;"> <span id="LC1100" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- some versions of hPutBuf will barf if the length is zero</span></span>
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1059
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1101
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<pre style="margin: 0;"> <span id="LC1101" class="line" lang="haskell"><span class="n" style="color: #333;">hPutPtrString</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Handle</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PtrString</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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