diff -r b3b4c487707c -r 53865692a354 mercurial/util.py
--- a/mercurial/util.py	Mon Mar 13 09:24:53 2017 -0700
+++ b/mercurial/util.py	Wed Mar 15 23:06:50 2017 +0900
@@ -2130,6 +2130,9 @@
     (1, 1, _('%.0f bytes')),
     )
 
+def escapestr(s):
+    return s.encode('string_escape')
+
 def uirepr(s):
     # Avoid double backslash in Windows path repr()
     return repr(s).replace('\\\\', '\\')