diff -r bd3f03d8cc9f -r 0f64091cc851 mercurial/dagop.py
--- a/mercurial/dagop.py	Mon Feb 04 08:54:30 2019 -0800
+++ b/mercurial/dagop.py	Mon Feb 04 09:07:00 2019 -0800
@@ -142,7 +142,7 @@
 
 def revancestors(repo, revs, followfirst=False, startdepth=None,
                  stopdepth=None, cutfunc=None):
-    """Like revlog.ancestors(), but supports additional options, includes
+    r"""Like revlog.ancestors(), but supports additional options, includes
     the given revs themselves, and returns a smartset
 
     Scan ends at the stopdepth (exlusive) if specified. Revisions found