recursive_data.py_

# This tests that printing recursive data structure doesn't lead to segfault.
# Unfortunately, print() so far doesn't support "file "kwarg, so variable-len
# output of this test cannot be redirected, and this test cannot be validated.
l = [1, 2, 3, None]
l[-1] = l
try:
    print(l)
except RuntimeError:
    print("RuntimeError")