py3: conditionalize cPickle import by adding in util The cPickle is renamed to _pickle in python3 and this C extension is available in pickle which was not included in earlier versions. So imports are conditionalized to import cPickle in py2 and pickle in py3. Moreover the use of pickle in py2 is switched to cPickle as the C extension is faster. The hack is added in util.py and the modules import util.pickle

--- a/mercurial/pycompat.py	Fri Jun 03 21:49:26 2016 +0900
+++ b/mercurial/pycompat.py	Sat Jun 04 14:38:00 2016 +0530
@@ -11,6 +11,12 @@
 from __future__ import absolute_import
 
 try:
+    import cPickle as pickle
+    pickle.dumps
+except ImportError:
+    import pickle
+
+try:
     import cStringIO as io
     stringio = io.StringIO
 except ImportError: