setup: clarify error messages for file/revisions ambiguity
The previous "Use '--' to separate filenames from revisions" may sound obvious for an old-time Unix user, but does not make it clear how to use this '--'. In addition to mentionning this '--', give an idea of what the new command should look like. Ideally, we could provide cut-and-paste ready commands based on the command that just failed, but we have no easy access to argv[] in this place of the code. Signed-off-by: NMatthieu Moy <Matthieu.Moy@imag.fr> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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