C:\>c:\python23\python
Python 2.3a1 (#38, Dec 31 2002, 17:53:59) [MSC 
v.1200 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more 
information.
>>> import parser
>>> a = file('c:\\python23\\lib\\base64.py').read()
>>> b = parser.suite(a)
>>> c = parser.ast2tuple(b)
>>> d = parser.sequence2ast(c)
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
parser.ParserError: VALIDATION FAILURE: report this 
to the maintainer!
>>> ^Z


C:\>

Problem also occurred on Python 2.2.2 on WinXP and 
RedHat 7.3

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The problem is floor division // on the line:

  MAXBINSIZE = (MAXLINESIZE//4)*3

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So the attached would be the fix, then?

I feel a "How to change Python's grammar" informational PEP
coming on...

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I'm not familiar with the parser module (this is the first
time I've looked at it).  But the patch looks correct.

As for the PEP, I think it's a good idea.  It would help
point out many details people (like me) are probably unaware of.

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Checked in as:

Modules/parsermodule.c revision 2.75
Lib/test/test_parser.py 1.14

logistix, can you check this works for you?

PEP already with editors.  It wasn't very long, as it turned
out.

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Yeah, works fine.  Thanks for the prompt action.