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When the users guide fails to build (as in #17346), a `docs/users_guide/.log` file will be generated with contents that look something like this: ``` WARNING: unknown config value 'latex_paper_size' in override, ignoring /home/rgscott/Software/ghc5/docs/users_guide/ghci.rst:3410: WARNING: u'ghc-flag' reference target not found: -pgmo ?option? /home/rgscott/Software/ghc5/docs/users_guide/ghci.rst:3410: WARNING: u'ghc-flag' reference target not found: -pgmo ?port? Encoding error: 'ascii' codec can't encode character u'\u27e8' in position 132: ordinal not in range(128) The full traceback has been saved in /tmp/sphinx-err-rDF2LX.log, if you want to report the issue to the developers. ``` This definitely should not be checked in to version control, so let's add this to `.gitignore`.
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