gpython: Can not retrieve a function attribute value #56

>>> def f():
...    f.x = 3
...    return f.x
...
>>> f()
3
>>>

>>> def f():
...    f.x = 3
...    return f.x
...
>>> f()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
    FIXME line of source goes here
  File "<stdin>", line 3, in f
    FIXME line of source goes here
SystemError: 'nil Dict in function'