Martin von Zweigbergk <martinvonz@google.com> [Fri, 28 Sep 2018 12:56:57 -0700] rev 39966
narrow: move copies overrides to core
The copies overrides seems to have been a little complicated just by
not being in core. When moved to core, it becomes trivial (at least I
think these overrides have the same effect).
Differential Revision: https://phab.mercurial-scm.org/D4825