diff -r 47fac1692ede -r 9f70512ae2cf mercurial/ancestor.py
--- a/mercurial/ancestor.py	Sun Nov 10 07:30:14 2019 -0800
+++ b/mercurial/ancestor.py	Fri Nov 08 11:19:20 2019 -0800
@@ -16,7 +16,7 @@
     pycompat,
 )
 
-parsers = policy.importmod(r'parsers')
+parsers = policy.importmod('parsers')
 
 
 def commonancestorsheads(pfunc, *nodes):