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	headrevs.discard(node.nullrev)			headrevs.discard(node.nullrev)

	return headrevs			return headrevs

	def linearize(revs, parentsfn):			def linearize(revs, parentsfn):
	"""Linearize and topologically sort a list of revisions.			"""Linearize and topologically sort a list of revisions.

	The linearization process tires to create long runs of revs where a child			The linearization process tries to create long runs of revs where a child
	rev comes immediately after its first parent. This is done by visiting the			rev comes immediately after its first parent. This is done by visiting the
	heads of the revs in inverse topological order, and for each visited rev,			heads of the revs in inverse topological order, and for each visited rev,
	visiting its second parent, then its first parent, then adding the rev			visiting its second parent, then its first parent, then adding the rev
	itself to the output list.			itself to the output list.

	Returns a list of revision numbers.			Returns a list of revision numbers.
	"""			"""
	visit = list(sorted(headrevs(revs, parentsfn), reverse=True))			visit = list(sorted(headrevs(revs, parentsfn), reverse=True))

dagop: fix typo spotted while doing unrelated investigationClosedPublic