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Confirmed (3.2):
>>> def func():
... t = collections.namedtuple('t', 'a')
... instance = t(1)
... print(instance)
... return pickle.dumps(instance)
>>> func()
t(a=1)
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "<stdin>", line 5, in func
_pickle.PicklingError: Can't pickle <class '__main__.t'>: attribute lookup __main__.t failed
We may open an enhancement request to suggest that the error message include the qualname, but otherwise this is not a bug.