My apologies. "latesttag" prints the latest tag that is an *ancestor*
of the given revision, so it's the last release that *didn't* have
that change. Of course, with mercurial having to deal with branching,
that's the only direction in which relations are well-defined. For
sage development, we want the oldest tag that is a descendant, so you
should use
val=subprocess.check_output(["hg","log",
"-r","limit(descendants(%s) and tag(),1)"%rev,
"--template","{tags}"])
instead of just printing "{latesttag}".
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