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Since inception, git-blame -L has been documented as accepting 1-based line numbers. When handed a line number less than 1, -L's behavior is undocumented and undefined; it's also nonsensical and should be diagnosed as an error. Do so. Signed-off-by: Eric Sunshine <sunshine@sunshineco.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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