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I have the impression that the bug has only been partially
solved, i.e. in 2.5c1, singleton tuples don't get unfoled in
list comprehensions.

Python 2.5c1 (r25c1:51305, Sep  4 2006, 10:15:09)
[GCC 4.1.1 20060525 (Red Hat 4.1.1-1)] on linux2
Type "help", "copyright", "credits" or "license" for more
information.
>>> l = [(1,), (2,)]
>>> print [x for x, in l]
[(1,), (2,)]

Same example in Python 2.4.3:

Python 2.4.3 (#1, Jul 25 2006, 11:53:03)
[GCC 4.1.1 20060525 (Red Hat 4.1.1-1)] on linux2
Type "help", "copyright", "credits" or "license" for more
information.
>>> l = [(1,), (2,)]
>>> print [x for x, in l]
[1, 2]