--- a/mercurial/revset.py Tue Oct 07 00:20:00 2014 -0700
+++ b/mercurial/revset.py Mon Oct 06 11:46:53 2014 -0700
@@ -2262,6 +2262,18 @@
raise ValueError('arg is an empty sequence')
return max(self)
+ def first(self):
+ """return the first element in the set (user iteration perspective)
+
+ Return None if the set is empty"""
+ raise NotImplementedError()
+
+ def last(self):
+ """return the last element in the set (user iteration perspective)
+
+ Return None if the set is empty"""
+ raise NotImplementedError()
+
def reverse(self):
"""reverse the expected iteration order"""
raise NotImplementedError()