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* src/comm.c (compare_files): Handle the single character --output-delimeter case separately so that NUL is appropriately handled. * doc/coreutils.texi (comm invocation): Fix the description of --output-delimiter to say an empty delimeter is treated as a NUL separator, rather than being disallowed. * tests/misc/comm.pl: Add a test case. Reported at https://bugs.debian.org/1014008