--- a/mercurial/encoding.py Sat Dec 12 22:57:48 2015 -0500
+++ b/mercurial/encoding.py Sat Dec 12 23:26:12 2015 -0800
@@ -407,7 +407,7 @@
if not _jsonmap:
for x in xrange(32):
- _jsonmap[chr(x)] = "\u%04x" %x
+ _jsonmap[chr(x)] = "\\u%04x" % x
for x in xrange(32, 256):
c = chr(x)
_jsonmap[c] = c