diff -r 47fac1692ede -r 9f70512ae2cf mercurial/mdiff.py
--- a/mercurial/mdiff.py	Sun Nov 10 07:30:14 2019 -0800
+++ b/mercurial/mdiff.py	Fri Nov 08 11:19:20 2019 -0800
@@ -27,8 +27,8 @@
 
 _missing_newline_marker = b"\\ No newline at end of file\n"
 
-bdiff = policy.importmod(r'bdiff')
-mpatch = policy.importmod(r'mpatch')
+bdiff = policy.importmod('bdiff')
+mpatch = policy.importmod('mpatch')
 
 blocks = bdiff.blocks
 fixws = bdiff.fixws