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EOF is not a member of any character class. If a classifier function returns a non-zero result for it, presumably by mistake, then the unit test check reports: # check "!iseof(EOF)" failed at t/unit-tests/t-ctype.c:53 # i: 0xffffffff (EOF) The numeric value of EOF is not particularly interesting in this context. Stop printing the second line. Signed-off-by: René Scharfe <l.s.r@web.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>