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<h3>
Daneel S. Yaitskov pushed to branch wip/T17949
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/6f6d3d52a192826afaa3f5cc2fe7f64b202701cb">6f6d3d52</a></strong>
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<span>by Daneel Yaitskov</span>
<i>at 2020-06-05T09:58:28-07:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">T17949 use when instead of if + return()
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/562f75c0ac60145574e31dc141de555b6ee6f100">562f75c0</a></strong>
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<span>by Daneel Yaitskov</span>
<i>at 2020-06-05T10:06:15-07:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">T17949 double check traceEvent and traceMarker
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<h4>1 changed file:</h4>
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<a href="#cbecf35546dee344ca6fb2e73c7515f07e868d0f">
libraries/base/Debug/Trace.hs
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<h4>Changes:</h4>
<li id="cbecf35546dee344ca6fb2e73c7515f07e868d0f">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/f7d009e39607862462205449a68744a23a66f73d...562f75c0ac60145574e31dc141de555b6ee6f100#cbecf35546dee344ca6fb2e73c7515f07e868d0f"><strong>libraries/base/Debug/Trace.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">@@ -48,7 +48,7 @@ module Debug.Trace (</td>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="haskell"></span>
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49
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">System.IO.Unsafe</span></span>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC51" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Monad</span> <span class="p">((</span><span class="o" style="font-weight: 600;"><$!></span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC51" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Monad</span> <span class="p">((</span><span class="o" style="font-weight: 600;"><$!></span><span class="p">)<span class="idiff left">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">when</span></span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Foreign.C.String</span></span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Base</span></span>
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="k" style="font-weight: 600;">qualified</span> <span class="nn" style="color: #555;">GHC.Foreign</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">@@ -266,9 +266,14 @@ traceStack str expr = unsafePerformIO $ do</td>
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<pre style="margin: 0;"> <span id="LC266" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;"> <span id="LC267" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @since 4.5.0.0</span></span>
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<pre style="margin: 0;"> <span id="LC268" class="line" lang="haskell"><span class="n" style="color: #333;">traceEvent</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">String</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">-<span id="LC269" class="line" lang="haskell"><span class="n" style="color: #333;">traceEvent</span> <span class="n" style="color: #333;">msg</span> <span class="n" style="color: #333;">expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unsafeDupablePerformIO</span> <span class="o" style="font-weight: 600;">$</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">-<span id="LC270" class="line" lang="haskell"> <span class="n" style="color: #333;">traceEventIO</span> <span class="n" style="color: #333;">msg</span></span>
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<pre style="margin: 0;">-<span id="LC271" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;">+<span id="LC269" class="line" lang="haskell"><span class="n" style="color: #333;">traceEvent</span> <span class="n" style="color: #333;">msg</span> <span class="n" style="color: #333;">expr</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC270" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">userTracingEnabled</span></span>
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<pre style="margin: 0;">+<span id="LC271" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span></span>
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<pre style="margin: 0;">+<span id="LC272" class="line" lang="haskell"> <span class="n" style="color: #333;">unsafeDupablePerformIO</span> <span class="o" style="font-weight: 600;">$</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC273" class="line" lang="haskell"> <span class="n" style="color: #333;">traceEventIO</span> <span class="n" style="color: #333;">msg</span></span>
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<pre style="margin: 0;">+<span id="LC274" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;">+<span id="LC275" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span></span>
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<pre style="margin: 0;">+<span id="LC276" class="line" lang="haskell"> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;"> <span id="LC277" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC278" class="line" lang="haskell"><span class="cd">-- | The 'traceEventIO' function emits a message to the eventlog, if eventlog</span></span>
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<pre style="margin: 0;"> <span id="LC279" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- profiling is available and enabled at runtime.</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">@@ -279,10 +284,10 @@ traceEvent msg expr = unsafeDupablePerformIO $ do</td>
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<pre style="margin: 0;"> <span id="LC284" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @since 4.5.0.0</span></span>
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<pre style="margin: 0;"> <span id="LC285" class="line" lang="haskell"><span class="n" style="color: #333;">traceEventIO</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">String</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="LC286" class="line" lang="haskell"><span class="n" style="color: #333;">traceEventIO</span> <span class="n" style="color: #333;">msg</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">-<span id="LC282" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;"><span class="idiff left right">if</span></span> <span class="n" style="color: #333;">userTracingEnabled</span></span>
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<pre style="margin: 0;">-<span id="LC283" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;"><span class="idiff left">then</span></span><span class="idiff right"> </span><span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Foreign</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">withCString</span> <span class="n" style="color: #333;">utf8</span> <span class="n" style="color: #333;">msg</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="n" style="color: #333;">p</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">s</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">-<span id="LC284" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">traceEvent</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">s</span> <span class="kr" style="font-weight: 600;">of</span> <span class="n" style="color: #333;">s'</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">s'</span><span class="p">,</span> <span class="nb" style="color: #0086b3;">()</span> <span class="o" style="font-weight: 600;">#</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC285" class="line" lang="haskell"><span class="idiff left"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">else</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">return</span></span><span class="idiff"> </span><span class="nb" style="color: #0086b3;"><span class="idiff right">()</span></span></span>
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<pre style="margin: 0;">+<span id="LC287" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left right">when</span></span> <span class="n" style="color: #333;">userTracingEnabled</span></span>
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<pre style="margin: 0;">+<span id="LC288" class="line" lang="haskell"> <span class="idiff left"> </span><span class="p"><span class="idiff right">(</span></span><span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Foreign</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">withCString</span> <span class="n" style="color: #333;">utf8</span> <span class="n" style="color: #333;">msg</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="n" style="color: #333;">p</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">s</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC289" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">traceEvent</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">s</span> <span class="kr" style="font-weight: 600;">of</span> <span class="n" style="color: #333;">s'</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">s'</span><span class="p">,</span> <span class="nb" style="color: #0086b3;">()</span> <span class="o" style="font-weight: 600;">#</span><span class="p">)<span class="idiff left right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC290" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC291" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC292" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- $markers</span></span>
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<pre style="margin: 0;"> <span id="LC293" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -318,9 +323,14 @@ traceEventIO msg =</td>
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<pre style="margin: 0;"> <span id="LC323" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;"> <span id="LC324" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @since 4.7.0.0</span></span>
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<pre style="margin: 0;"> <span id="LC325" class="line" lang="haskell"><span class="n" style="color: #333;">traceMarker</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">String</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">-<span id="LC321" class="line" lang="haskell"><span class="n" style="color: #333;">traceMarker</span> <span class="n" style="color: #333;">msg</span> <span class="n" style="color: #333;">expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unsafeDupablePerformIO</span> <span class="o" style="font-weight: 600;">$</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">-<span id="LC322" class="line" lang="haskell"> <span class="n" style="color: #333;">traceMarkerIO</span> <span class="n" style="color: #333;">msg</span></span>
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<pre style="margin: 0;">-<span id="LC323" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;">+<span id="LC326" class="line" lang="haskell"><span class="n" style="color: #333;">traceMarker</span> <span class="n" style="color: #333;">msg</span> <span class="n" style="color: #333;">expr</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC327" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">userTracingEnabled</span></span>
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<pre style="margin: 0;">+<span id="LC328" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span></span>
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<pre style="margin: 0;">+<span id="LC329" class="line" lang="haskell"> <span class="n" style="color: #333;">unsafeDupablePerformIO</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="LC330" class="line" lang="haskell"> <span class="n" style="color: #333;">traceMarkerIO</span> <span class="n" style="color: #333;">msg</span></span>
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<pre style="margin: 0;">+<span id="LC331" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;">+<span id="LC332" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span></span>
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<pre style="margin: 0;">+<span id="LC333" class="line" lang="haskell"> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;"> <span id="LC334" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC335" class="line" lang="haskell"><span class="cd">-- | The 'traceMarkerIO' function emits a marker to the eventlog, if eventlog</span></span>
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<pre style="margin: 0;"> <span id="LC336" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- profiling is available and enabled at runtime.</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">@@ -331,7 +341,6 @@ traceMarker msg expr = unsafeDupablePerformIO $ do</td>
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<pre style="margin: 0;"> <span id="LC341" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @since 4.7.0.0</span></span>
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<pre style="margin: 0;"> <span id="LC342" class="line" lang="haskell"><span class="n" style="color: #333;">traceMarkerIO</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">String</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="LC343" class="line" lang="haskell"><span class="n" style="color: #333;">traceMarkerIO</span> <span class="n" style="color: #333;">msg</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">-<span id="LC334" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">userTracingEnabled</span></span>
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<pre style="margin: 0;">-<span id="LC335" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Foreign</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">withCString</span> <span class="n" style="color: #333;">utf8</span> <span class="n" style="color: #333;">msg</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="n" style="color: #333;">p</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">s</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">-<span id="LC336" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">traceMarker</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">s</span> <span class="kr" style="font-weight: 600;">of</span> <span class="n" style="color: #333;">s'</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">s'</span><span class="p">,</span> <span class="nb" style="color: #0086b3;">()</span> <span class="o" style="font-weight: 600;">#</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC337" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span></pre>
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<pre style="margin: 0;">+<span id="LC344" class="line" lang="haskell"> <span class="n" style="color: #333;">when</span> <span class="n" style="color: #333;">userTracingEnabled</span></span>
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<pre style="margin: 0;">+<span id="LC345" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Foreign</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">withCString</span> <span class="n" style="color: #333;">utf8</span> <span class="n" style="color: #333;">msg</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="n" style="color: #333;">p</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">s</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC346" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">traceMarker</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">s</span> <span class="kr" style="font-weight: 600;">of</span> <span class="n" style="color: #333;">s'</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">s'</span><span class="p">,</span> <span class="nb" style="color: #0086b3;">()</span> <span class="o" style="font-weight: 600;">#</span><span class="p">))</span></span></pre>
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