393     of any other head in the repo. If a second set is specified, the result

   393     of any other head in the repo. If a second set is specified, the result

   394     is ancestors of the first set that are not ancestors of the second set

   394     is ancestors of the first set that are not ancestors of the second set

   395     (i.e. ::<set1> - ::<set2>).

   395     (i.e. ::<set1> - ::<set2>).

   396     """

   396     """

   397     cl = repo.changelog

   397     cl = repo.changelog

   398     args = getargs(x, 1, 2, _('only takes one or two arguments'))

   399     args = getargs(x, 1, 2, _('only takes one or two arguments'))

   399     include = getset(repo, spanset(repo), args[0]).set()

   400     include = getset(repo, spanset(repo), args[0]).set()

   400     if len(args) == 1:

   401     if len(args) == 1:

   401         descendants = set(_revdescendants(repo, include, False))

   402         descendants = set(_revdescendants(repo, include, False))

   402         exclude = [rev for rev in cl.headrevs()

   403         exclude = [rev for rev in cl.headrevs()