Noticed this because test_compiler fails on _strptime
as of yesterday.

Here's what seems to be a fairly minimal example: 

f((x for x in y), 1)

The traceback is huge, but ends with:

  File
"/home/mwh/src/python/dist/src/Lib/compiler/transformer.py",
line 687, in power
    node = self.com_apply_trailer(node, elt)
  File
"/home/mwh/src/python/dist/src/Lib/compiler/transformer.py",
line 1144, in com_apply_trailer
    return self.com_call_function(primaryNode, nodelist[2])
  File
"/home/mwh/src/python/dist/src/Lib/compiler/transformer.py",
line 1169, in com_call_function
    raise SyntaxError, 'generator expression needs
parenthesis'
SyntaxError: generator expression needs parenthesis

Might be a problem in transformer.py, not really sure.

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Hang on, the exception is *inside* transformer.py.  Duh.

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Do you know how to fix this?

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No.  I'm hoping jiwon (he who wrote the genexps patch) does
-- I've sent him a mail.

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Failing case, distilled down:

import compiler
a="""def foo(*x): return x
foo((a for b in [[1,2,3],[4,5,6]] for a in b),'Z')"""
compiler.compile(a,'<string>', 'exec')

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Rather more minimal example:

from compiler import transformer
transformer.parse("f((x for x in y), 1)")

The problem is in transformer.py.

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I fixed the bug. The bug was due to the wrong check
condition for allowing "f(x for x in y)", but rejecting "f(x
for x in y, 1)"

The patch is
http://seojiwon.dnip.net:8000/~jiwon/transformer.diff

I hope mwh will upload that file here, since I don't have
the permission.

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Attaching Jiwon's patch (after converting it to a context
diff, *thwack* :-)

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Checked in jiwon's fix as Lib/compiler/transformer.py
revision 1.48.