demonstrates a segfault on python 2.7.3 and python 3.2.3

segfault.py

import itertools, timeit
import sys
if sys.version_info < (3,):
  range = xrange
    
a = (i for i in range(11**7)); b,c = itertools.tee(a)

print(timeit.timeit(lambda : sum(b), number=1))
# this line segfaults:
a = (i for i in range(11**7)); b,c = itertools.tee(a)