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<h3>
Marge Bot pushed to branch master
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/4813486f8756fde7889b214e6e41ae63465f7ad7">4813486f</a></strong>
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<span>by Sylvain Henry</span>
<i>at 2020-09-04T22:27:44-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move Hadrian's wiki pages in tree (fix #16165)
Only the debugging page contains interesting stuff. Some of this stuff
looks old (e.g. recommending "cabal install")...
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<h4>1 changed file:</h4>
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hadrian/doc/debugging.md
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<h4>Changes:</h4>
<li id="56decf35000981a98f68a7a68b610f9d1d28c5c9">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4813486f8756fde7889b214e6e41ae63465f7ad7#56decf35000981a98f68a7a68b610f9d1d28c5c9"><strong>hadrian/doc/debugging.md</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="markdown"><span class="gu" style="color: #800080; font-weight: 600;">## General tips on debugging Haskell</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="markdown">https://wiki.haskell.org/Debugging</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="markdown"><span class="gu" style="color: #800080; font-weight: 600;">## General tips on debugging shake</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="markdown">http://shakebuild.com/debugging</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="markdown"><span class="gu" style="color: #800080; font-weight: 600;">## Make-based old system</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="markdown"><span class="p">1.</span> <span class="sb" style="color: #d14;">`make show! VALUE=$(NAME)$`</span> to check the value of variable <span class="sb" style="color: #d14;">`NAME`</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="markdown"><span class="gu" style="color: #800080; font-weight: 600;">## Debugging Hadrian</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="markdown"><span class="gu" style="color: #800080; font-weight: 600;">### General thoughts</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="markdown"><span class="p">1.</span> If a build command with some flags doesn't work, will that work on the Make-based old system? (Note that the directory structure is different, so we need to do some conversion)</span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="markdown"><span class="p">2.</span> If you delete something, but run top-level target again doesn't produce that, then it must be that this things is not correctly registered as tracked output</span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="markdown"><span class="gu" style="color: #800080; font-weight: 600;">### Verbosity</span></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="markdown">Adding <span class="sb" style="color: #d14;">`-V`</span>, <span class="sb" style="color: #d14;">`-VV`</span>, <span class="sb" style="color: #d14;">`-VVV`</span> can output more information from Shake and Hadrian for debugging purpose. For example, to print out the complete commands, you can use <span class="sb" style="color: #d14;">`-V`</span>.</span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="markdown"><span class="gu" style="color: #800080; font-weight: 600;">### Common pitfalls</span></span>
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25
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="markdown"><span class="p">-</span> Out-of-date <span class="sb" style="color: #d14;">`UserSetting.hs`</span>? (may cause compilation errors while building hadrian itself)</span>
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27
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="markdown"><span class="p">-</span> Path: absolute? relative? platform-dependent?</span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="markdown"><span class="p">-</span> Missing environment variables?</span>
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29
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="markdown"><span class="p">-</span> The upstream GHC/Cabal/... has updated</span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="markdown"><span class="gu" style="color: #800080; font-weight: 600;">### How to read exception message</span></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="markdown"><span class="gu" style="color: #800080; font-weight: 600;">#### Type 1: `openFile: does not exist`</span></span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="markdown"><span class="gs" style="font-weight: 600;">**Example:**</span> <span class="sb" style="color: #d14;">`hadrian: _build/stage1/ghc/GHCi/UI.o: openFile: does not exist (No such file or directory)`</span></span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="markdown"><span class="gs" style="font-weight: 600;">**Cause:**</span> The build system tries to execute some <span class="ge" style="font-style: italic;">*raw*</span> I/O operation, which is not captured properly by shake build or any other handling mechanism.</span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="markdown"><span class="gs" style="font-weight: 600;">**Solution:**</span> Use shake-provided or <span class="sb" style="color: #d14;">`Util`</span>-provided I/O actions which can automatically make input files <span class="ge" style="font-style: italic;">*dependencies*</span>, and throw better exception (like below) when no rule for building these files exists.</span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC41" class="line" lang="markdown"><span class="gu" style="color: #800080; font-weight: 600;">#### Type 2: `Error when running Shake build system:`</span></span>
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<pre style="margin: 0;">+<span id="LC42" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="markdown">Example:</span>
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<pre style="margin: 0;">+<span id="LC44" class="line" lang="markdown"></span>
</pre>
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<pre style="margin: 0;">+<span id="LC45" class="line" lang="markdown"><span class="p">```</span></span>
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<pre style="margin: 0;">+<span id="LC46" class="line" lang="markdown">Error when running Shake build system:</span>
</pre>
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<pre style="margin: 0;">+<span id="LC47" class="line" lang="markdown">* OracleQ (PackageDataKey ("_build/stage1/libraries/unix/package-data.mk","COMPONENT_ID"))</span>
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="markdown">* _build/stage1/libraries/unix/package-data.mk</span>
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<pre style="margin: 0;">+<span id="LC49" class="line" lang="markdown">* OracleQ (PackageDataKey ("_build/stage1/libraries/base/package-data.mk","COMPONENT_ID"))</span>
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<pre style="margin: 0;">+<span id="LC50" class="line" lang="markdown">* _build/stage1/libraries/base/package-data.mk</span>
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<pre style="margin: 0;">+<span id="LC51" class="line" lang="markdown">* OracleQ (PackageDataKey ("_build/stage1/libraries/ghc-prim/package-data.mk","COMPONENT_ID"))</span>
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<pre style="margin: 0;">+<span id="LC52" class="line" lang="markdown">* _build/stage1/libraries/ghc-prim/package-data.mk</span>
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<pre style="margin: 0;">+<span id="LC53" class="line" lang="markdown">* _build/stage1/libraries/ghc-prim/GHC/Prim.hs</span>
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<pre style="margin: 0;">+<span id="LC54" class="line" lang="markdown">* inplace/bin/genprimopcode</span>
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<pre style="margin: 0;">+<span id="LC55" class="line" lang="markdown">* OracleQ (PackageDataKey ("_build/stage0/utils/genprimopcode/package-data.mk","C_SRCS"))</span>
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<pre style="margin: 0;">+<span id="LC56" class="line" lang="markdown">* _build/stage0/utils/genprimopcode/package-data.mk</span>
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<pre style="margin: 0;">+<span id="LC57" class="line" lang="markdown">user error (Development.Shake.cmd, system command failed</span>
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<pre style="margin: 0;">+<span id="LC58" class="line" lang="markdown">Command: _build/stage0/utils/ghc-cabal/ghc-cabal configure utils/genprimopcode /Users/zz/Repos/ghc2/_build/stage0/utils/genprimopcode '' --with-ghc=/usr/local/bin/ghc --with-ghc-pkg=/usr/local/bin/ghc-pkg --package-db=_build/stage0/bootstrapping.conf --enable-library-vanilla --enable-library-for-ghci --disable-library-profiling --disable-shared --with-hscolour=/Users/zz/Library/Haskell/bin/HsColour '--configure-option=CFLAGS=-fno-stack-protector -I/Users/zz/Repos/ghc2/_build/generated' --configure-option=CPPFLAGS=-I_build/generated '--gcc-options=-fno-stack-protector -I/Users/zz/Repos/ghc2/_build/generated' --configure-option=--with-cc=/usr/bin/gcc --constraint 'Cabal == 2.0.0.0' --constraint 'binary == 0.8.4.1' --constraint 'ghc-boot == 8.3' --constraint 'ghc-boot-th == 8.3' --constraint 'ghci == 8.3' --constraint 'hoopl == 3.10.2.2' --constraint 'hpc == 0.6.0.3' --constraint 'template-haskell == 2.12.0.0' --constraint 'terminfo == 0.4.1.0' --constraint 'transformers == 0.5.2.0' --with-gcc=/usr/bin/gcc --with-ar=/usr/bin/ar --with-alex=/Users/zz/Library/Haskell/bin/alex --with-happy=/Users/zz/Library/Haskell/bin/happy -v0 --configure-option=--quiet --configure-option=--disable-option-checking</span>
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<pre style="margin: 0;">+<span id="LC59" class="line" lang="markdown">Exit code: 1</span>
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<pre style="margin: 0;">+<span id="LC60" class="line" lang="markdown">Stderr:</span>
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<pre style="margin: 0;">+<span id="LC61" class="line" lang="markdown">ghc-cabal: ghc-pkg dump failed: dieVerbatim: user error (ghc-cabal:</span>
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<pre style="margin: 0;">+<span id="LC62" class="line" lang="markdown">'/usr/local/bin/ghc-pkg' exited with an error:</span>
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<pre style="margin: 0;">+<span id="LC63" class="line" lang="markdown">ghc-pkg: _build/stage0/bootstrapping.conf: getDirectoryContents: does not</span>
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<pre style="margin: 0;">+<span id="LC64" class="line" lang="markdown">exist (No such file or directory)</span>
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<pre style="margin: 0;">+<span id="LC65" class="line" lang="markdown">)</span>
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<pre style="margin: 0;">+<span id="LC66" class="line" lang="markdown">)</span>
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<pre style="margin: 0;">+<span id="LC67" class="line" lang="markdown"><span class="p">```</span></span>
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<pre style="margin: 0;">+<span id="LC68" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC69" class="line" lang="markdown">First, the list of <span class="sb" style="color: #d14;">`OracleQ`</span>s is similar to a call trace. Each <span class="sb" style="color: #d14;">`OracleQ`</span> line specifies the <span class="ge" style="font-style: italic;">*target*</span>, and lines without <span class="sb" style="color: #d14;">`OracleQ`</span> after it specify dependencies. Each dependency is the <span class="ge" style="font-style: italic;">*target*</span> of the next level.</span>
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<pre style="margin: 0;">+<span id="LC70" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC71" class="line" lang="markdown">The last level's target in the above example is <span class="sb" style="color: #d14;">`_build/stage0/utils/genprimopcode/package-data.mk`</span>. Build system tries to build it with the command as shown in <span class="sb" style="color: #d14;">`Command`</span> line (this is very useful -- since you can copy & paste and tweak with it directly when trying find the right rule).</span>
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<pre style="margin: 0;">+<span id="LC72" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC73" class="line" lang="markdown">The error dumped after the <span class="sb" style="color: #d14;">`Command`</span> line can help you identify the potential bug quickly.</span>
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<pre style="margin: 0;">+<span id="LC74" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC75" class="line" lang="markdown"><span class="gu" style="color: #800080; font-weight: 600;">### Run some snippets</span></span>
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<pre style="margin: 0;">+<span id="LC76" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC77" class="line" lang="markdown">Sometimes it is useful to run a few lines of code for debugging purpose, for example, print out the dependencies of <span class="sb" style="color: #d14;">`cabal`</span>. The fastest way to do this is to modify the <span class="sb" style="color: #d14;">`Main.hs`</span>, comment out the heavy-lifting rules, add insert the code you'd like to run.</span>
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<pre style="margin: 0;">+<span id="LC78" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC79" class="line" lang="markdown"><span class="p">```</span><span class="nl">haskell</span></span>
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<pre style="margin: 0;">+<span id="LC80" class="line" lang="markdown"> <span class="kt" style="color: #458; font-weight: 600;">Rules</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Clean</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">cleanRules</span></span>
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<pre style="margin: 0;">+<span id="LC81" class="line" lang="markdown"> <span class="kt" style="color: #458; font-weight: 600;">Rules</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Oracles</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">oracleRules</span></span>
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<pre style="margin: 0;">+<span id="LC82" class="line" lang="markdown"> <span class="c1" style="color: #998; font-style: italic;">-- Rules.SourceDist.sourceDistRules</span></span>
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<pre style="margin: 0;">+<span id="LC83" class="line" lang="markdown"> <span class="c1" style="color: #998; font-style: italic;">-- Rules.Selftest.selftestRules</span></span>
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<pre style="margin: 0;">+<span id="LC84" class="line" lang="markdown"> <span class="c1" style="color: #998; font-style: italic;">-- Rules.Test.testRules</span></span>
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<pre style="margin: 0;">+<span id="LC85" class="line" lang="markdown"> <span class="c1" style="color: #998; font-style: italic;">-- Rules.buildRules</span></span>
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<pre style="margin: 0;">+<span id="LC86" class="line" lang="markdown"> <span class="c1" style="color: #998; font-style: italic;">-- Rules.topLevelTargets</span></span>
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<pre style="margin: 0;">+<span id="LC87" class="line" lang="markdown"> <span class="n" style="color: #333;">rulesToTest</span></span>
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<pre style="margin: 0;">+<span id="LC88" class="line" lang="markdown"><span class="p">```</span></span>
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<pre style="margin: 0;">+<span id="LC89" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC90" class="line" lang="markdown"><span class="gu" style="color: #800080; font-weight: 600;">## How to enable stack trace</span></span>
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<pre style="margin: 0;">+<span id="LC91" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC92" class="line" lang="markdown">first, build shake with profile support:</span>
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<pre style="margin: 0;">+<span id="LC93" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC94" class="line" lang="markdown"><span class="p">```</span></span>
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<pre style="margin: 0;">+<span id="LC95" class="line" lang="markdown"># inside shake source directory</span>
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<pre style="margin: 0;">+<span id="LC96" class="line" lang="markdown">cabal install --enable-profiling</span>
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<pre style="margin: 0;">+<span id="LC97" class="line" lang="markdown"><span class="p">```</span></span>
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98
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<pre style="margin: 0;">+<span id="LC98" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC99" class="line" lang="markdown"><span class="p">```</span></span>
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<pre style="margin: 0;">+<span id="LC100" class="line" lang="markdown"># for an example source file</span>
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<pre style="margin: 0;">+<span id="LC101" class="line" lang="markdown">cabal exec -- ghc -prof -fprof-auto examples/Main.hs</span>
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<pre style="margin: 0;">+<span id="LC102" class="line" lang="markdown"><span class="p">```</span></span>
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<pre style="margin: 0;">+<span id="LC103" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC104" class="line" lang="markdown">and a work-in-progress <span class="p">[</span><span class="nv" style="color: #008080;">traced fork of shake</span><span class="p">](</span><span class="sx" style="color: #d14;">https://github.com/monad-systems/shake/tree/traced</span><span class="p">)</span></span></pre>
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