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由 Fredrik Kuivinen 提交于
Before this patch git-blame <directory> gave non-sensible output. (It assigned blame to some random file in <directory>) Abort with an error message instead. Signed-off-by: NFredrik Kuivinen <freku045@student.liu.se> Signed-off-by: NJunio C Hamano <junkio@cox.net>
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