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In 'ci/test-documentation.sh' we save the standard error of 'make doc', and, in an attempt to make sure that neither AsciiDoc nor Asciidoctor printed any warnings, we check the emptiness of the resulting file with '! test -s stderr.log'. This check has never actually worked, because in our 'ci/*' build scripts we rely on 'set -e' aborting the build job when a command exits with error, and, unfortunately, the combination of the two doesn't work as intended. According to POSIX [1]: "The -e setting shall be ignored when executing [...] a pipeline beginning with the ! reserved word" [2] Watch and learn: $ echo unexpected >file $ ( set -e; ! test -s file ; echo "should not reach this" ) ; echo $? should not reach this 0 This is why we haven't noticed the warnings from Asciidoctor that were fixed in the first patches of this patch series, though some of them were already there in the build of v2.18.0-rc0 [3]. Check the em...
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