[PATCH 3 of 7] pycompat: alias xrange to range in py3

[timeless]

# HG changeset patch
# User timeless <timeless at mozdev.org>
# Date 1459982152 0
#      Wed Apr 06 22:35:52 2016 +0000
# Node ID cbae00f13ee7afa9dfee577a325ee31d46a84a59
# Parent  295d79e7d8dd3da8e9ce33611916574d7ddc0ad8
pycompat: alias xrange to range in py3

diff --git a/mercurial/pycompat.py b/mercurial/pycompat.py
--- a/mercurial/pycompat.py
+++ b/mercurial/pycompat.py
@@ -17,3 +17,9 @@
     import queue as _queue
 empty = _queue.Empty
 queue = _queue.Queue
+
+try:
+    xrange
+except NameError:
+    import builtins
+    builtins.xrange = range