--- a/mercurial/dagop.py Thu Jan 27 22:24:11 2022 +0100 +++ b/mercurial/dagop.py Mon Jan 31 18:04:11 2022 +0300 @@ -9,7 +9,6 @@ import heapq -from .node import nullrev from .thirdparty import attr from .node import nullrev from . import (