cpython/Lib/test/crashers/borrowed_ref_1.py

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"""
_PyType_Lookup() returns a borrowed reference.
This attacks the call in dictobject.c.
"""
class A(object):
pass
class B(object):
def __del__(self):
print 'hi'
del D.__missing__
class D(dict):
class __missing__:
def __init__(self, *args):
pass
d = D()
a = A()
a.cycle = a
a.other = B()
del a
prev = None
while 1:
d[5]
prev = (prev,)