On Apr 4, 2011, at 2:00 PM, Guido van Rossum wrote:

> On Mon, Apr 4, 2011 at 10:05 AM, fwierzbi...@gmail.com
> <fwierzbi...@gmail.com> wrote:
>> As a re-implementor of ast.py that tries to be node for node
>> compatible, I'm fine with #1 but would really like to have tests that
>> will fail in test_ast.py to alert me!
> 
> [and]
> 
> On Mon, Apr 4, 2011 at 10:38 AM, Michael Foord
> <fuzzy...@voidspace.org.uk> wrote:
>> A lot of tools that work with Python source code use ast - so even though
>> other implementations may not use the same ast "under the hood" they will
>> probably at least *want* to provide a compatible implementation. IronPython
>> is in that boat too (although I don't know if we *have* a compatible
>> implementation yet - we certainly feel like we *should* have one).
> 
> Ok, so it sounds like ast is *not* limited to CPython?

Oh, definitely not.  I would be pretty dismayed if tools like 
<http://bazaar.launchpad.net/~divmod-dev/divmod.org/trunk/files/head:/Pyflakes/>
 would not run on Jython & PyPy.

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