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>>> import json
>>> json.loads("{}", [1, 2, 3])
Traceback (most recent call last):
 File "<input>", line 1, in <module>
 File "/usr/local/Cellar/python/2.7.2/lib/python2.7/json/__init__.py", line 339, in loads
 return cls(encoding=encoding, **kw).decode(s)
 File "/usr/local/Cellar/python/2.7.2/lib/python2.7/json/decoder.py", line 359, in __init__
 self.scan_once = scanner.make_scanner(self)
SystemError: NULL result without error in PyObject_Call
Python 3.2 and 2.6 are not affected it'd seem, so it looks to be 2.7 only.