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Infinite recursion problem. I know this file is obscure, but it's still
pretty valid python.

Testing with a much simpler file ("a = 0\n" * 1000), there is a limit to
the number of statements in one file, around (sys.recursionlimit - 24).

Yes, this is a known problem with the pattern matching system.

My iterative pattern matching doesn't break on this file, but as
mentioned elsewhere, the iterative solution is slower. I'll work on
speeding it up, but I don't immediately see a good way to do so. Any
ideas would be greatly appreciated.

The much simpler input might be another problem::
 # this is accepted
 b = ("a = 0\n" * 100)
 # this one breaks it
 ("a = 0\n" * 100)
this looks similar to ``map(None, t)`` on a line by itself is 
translated to ``list(map(None, t))`` and the message "You should use a 
for loop her"

Truncating the file to 2448 lines helps, seams to be a size not content 
problem.
All fixes work exept fix_next.py .
And removing the lines ::
 |
 mod=file_input< any+ >
makes even this run through.

pywin32 has a number of files that break in this way - often files
generated by h2py.py

Fixed in r66775.