The code, as well as the files for javacc and asdl (both were changed)
are available in the pydev cvs at sourceforge, in the
org.python.pydev.parser module (the packages should be the same jython
uses -- org.python.parser and org.python.parser.ast).

The tests I used are available in the tests source folder
Hey -- that's great!
Unfortunately we probably will not be able to integrate 2.4 features in until after we get a 2.3 version stable... But I hope you can remind us of this work (or I can remember it) when we do get to that point.  If you want to leave a strong reminder you could submit your changes as a patch -- but I mean this as only the gentlest of nudges since it will likely be quite a while before we could really look at it.