>  As stated in the PEP, one of the primary motiviations for the proposal is
>  to allow grammar extensions to be prototyped in Python (esp. optional
>  static typing.)  I would argue that making actual changes to CPython is
>  much more expensive than writing a front end in Python.  By adding a pgen
>  module to Python, I feel that we are not bloating Python so much as we are
>  exposing funtionality already built into Python.

The potential problem is that this new module must then be supported
for a long time. People will propose extensions to it, which must be
evaluated, and every change must be reviewed carefully for
incompatibilities.

I'm not opposed to changes. However, I fail to see the value of
prototyping the grammar, since you'll need subsequent changes as well,
to the byte code generation, and perhaps evaluation. Also, I still
doubt anybody interested in changing the grammar couldn't easily
recompile Python.

Regards,
Martin

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