Martin von Zweigbergk <martinvonz@google.com> [Thu, 11 Jul 2019 09:38:42 -0700] rev 4730
py3: back out 23323092f0a7
D6623 has now been accepted in Mercurial (commit 83666f011679), so
evolve commit 23323092f0a7 (py3: convert _origdoc to sysstr to match
__doc__, 2019-07-09) is not longer needed.