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$ cat bug_fine.py 
if True:
 max (a='a', 'b')
#elif True:
# pass
else:
 pass
$ python bug_fine.py 
 File "bug_fine.py", line 2
 max (a='a', 'b')
SyntaxError: non-keyword arg after keyword arg
$ cat bug_show.py 
if True:
 max (a='a', 'b')
elif True:
 pass
else:
 pass
$ python bug_show.py 
Exception exceptions.SyntaxError: ('non-keyword arg after keyword arg',
2) in 'garbage collection' ignored
Fatal Python error: unexpected exception during garbage collection
Abort trap
$

I should add that the full version information is:
Python 2.5 (r25:51908, Aug 15 2007, 11:38:03) 
[GCC 4.0.1 (Apple Computer, Inc. build 5367)] on darwin
Also, in my actual code (a much larger file, in a project using ll.xist
and other libraries), the error manifests differently: I get
"TypeError: 'int' object is not iterable" on startup the first time it
loads, then it appears to run subsequent times, but behaves bizarrely. 
Specifically, *none* of the branches of the if statement run (verified
by putting a nonsense symbol after the if statement, and at the
beginning and end of each branch of the if statement; the "no such
symbol" error concerns the one *after* the if statement). On neither
run is the "non-keyword arg after keyword arg" reported.

Already fixed in the trunk. Thanks for the report!