Add new @ shortcut for HEAD
Typing 'HEAD' is tedious, especially when we can use '@' instead. The reason for choosing '@' is that it follows naturally from the ref@op syntax (e.g. HEAD@{u}), except we have no ref, and no operation, and when we don't have those, it makes sens to assume 'HEAD'. So now we can use 'git show @~1', and all that goody goodness. Until now '@' was a valid name, but it conflicts with this idea, so let's make it invalid. Probably very few people, if any, used this name. Signed-off-by: NFelipe Contreras <felipe.contreras@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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