[Pyparsing] recursion in _flatten after version 1.5.2

[Luke C. <lca...@em...>]

Howdy,
I have a script that I use to strip comments from C files. The code fails
for any pyparsing version later than 1.5.2.
Backtrace looks like this:

    File "CParser.py", line 300, in removeComments
      self.files[file] = (quotedString | cStyleComment.suppress() |
cplusplusLineComment.suppress()).transformString(text)
    File "c:\python27\lib\site-packages\pyparsing.py", line 1166, in
transformString
      return "".join(map(_ustr,_flatten(out)))
    File "c:\python27\lib\site-packages\pyparsing.py", line 3190, in
_flatten
      return _flatten(L[0]) + _flatten(L[1:])
    File "c:\python27\lib\site-packages\pyparsing.py", line 3190, in
_flatten
      return _flatten(L[0]) + _flatten(L[1:])
    . . .
    File "c:\python27\lib\site-packages\pyparsing.py", line 3188, in
_flatten
      if type(L) is not list: return [L]
  RuntimeError: maximum recursion depth exceeded while calling a Python
object


If I remember correctly, 'quotedString' and cStyleComment' are provided by
pyparsing, and I have provided this definition:

    cplusplusLineComment = Literal("//") + restOfLine

Any hints?

Luke