1903
1903
self._pack_collection.ensure_loaded()
1904
1904
index = self._pack_collection.revision_index.combined_index
1906
1908
if _mod_revision.NULL_REVISION in keys:
1907
1909
keys.discard(_mod_revision.NULL_REVISION)
1908
1910
found_parents = {_mod_revision.NULL_REVISION:()}