Message1050

Test case in Jython:

>>> from __future__ import generators
>>> def gen():
...   yield 1
...   raise StopIteration
...
>>> list(gen())
Traceback (innermost last):
  File "<console>", line 1, in ?
  File "<console>", line 3, in gen
StopIteration:

In CPython:
>>> def gen():
...   yield 1
...   raise StopIteration
...
>>> list(gen())
[1]

Same for tuple(gen()), etc., so the problem seems to
lie in the generator implementation.