# Calls to PyIter_Next, or direct calls to tp_iternext, on an object

# which might no longer be an iterable because its 'next' method was

# removed.  These are all variants of Issue3720.

"""

Run this script with an argument between 1 and <N> to test for

different crashes.

"""

N = 8

import sys

class Foo(object):

    def __iter__(self):

        return self

    def next(self):

        del Foo.next

        return (1, 2)

def case1():

    list(enumerate(Foo()))

def case2():

    x, y = Foo()

def case3():

    filter(None, Foo())

def case4():

    map(None, Foo(), Foo())

def case5():

    max(Foo())

def case6():

    sum(Foo(), ())

def case7():

    dict(Foo())

def case8():

    sys.stdout.writelines(Foo())

# etc...

if __name__ == '__main__':

    if len(sys.argv) < 2:

        print __doc__.replace('<N>', str(N))

    else:

        n = int(sys.argv[1])

        func = globals()['case%d' % n]

        func()