--- a/mercurial/util.py	Sat Aug 17 15:43:41 2019 +0900
+++ b/mercurial/util.py	Sat Aug 17 10:25:04 2019 +0900
@@ -53,7 +53,7 @@
     stringutil,
 )
 
-rustdirs = policy.importrust('dirstate', 'Dirs')
+rustdirs = policy.importrust(r'dirstate', r'Dirs')
 
 base85 = policy.importmod(r'base85')
 osutil = policy.importmod(r'osutil')