--- a/mercurial/util.py	Sat Mar 18 12:27:52 2017 -0400
+++ b/mercurial/util.py	Fri Mar 17 23:42:46 2017 +0900
@@ -2137,6 +2137,9 @@
     # Python 3 compatibility
     return codecs.escape_encode(s)[0]
 
+def unescapestr(s):
+    return s.decode('string_escape')
+
 def uirepr(s):
     # Avoid double backslash in Windows path repr()
     return repr(s).replace('\\\\', '\\')