rust-dagops: roots
Unsuprisingly, the algorithm is much easier than for heads, provided
we work on a set in the first place.
To improve the signature, a trait for set-likes object would be useful,
but that's not an immediate concern.
Differential Revision: https://phab.mercurial-scm.org/D6230
# name space package to host third party extensions
from __future__ import absolute_import
import pkgutil
__path__ = pkgutil.extend_path(__path__, __name__)