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user_id=593130

On <<<Python 2.2.1 (#34, Apr  9 2002, 19:34:33) [MSC 32 
bit (Intel)] on win32>>> I got (interactive mode, about 5 
sec before ^C)  appropriate output:

((((((((((((((((((((((((((((((((((((((((((((((((((((((
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
MemoryError: stack overflow

The nested depth was
>>> i=0
>>> while loop: loop,i = loop[0], i+1
...
>>> i
50695

Note: a test case would need a finite loop such as:
for i in range(100000) 
instead of while True (until ^C pressed).