Issue1497

$ ./dist/bin/jython
Jython 2.5.1+ (trunk:6914, Oct 27 2009, 15:50:22)
[Java HotSpot(TM) Server VM (Sun Microsystems Inc.)] on java1.6.0_14
Type "help", "copyright", "credits" or "license" for more information.
>>> import ast
>>> ast.expr.__bases__
(<type '_ast.AST'>,)
>>> ast.Name.__bases__
(<type '_ast.AST'>,)
>>> ast.For.__bases__
(<type '_ast.AST'>,)

$ python
Python 2.6.2 (release26-maint, Apr 19 2009, 01:56:41)
[GCC 4.3.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import ast
>>> ast.expr.__bases__
(<type '_ast.AST'>,)
>>> ast.Name.__bases__
(<class '_ast.expr'>,)
>>> ast.For.__bases__
(<class '_ast.stmt'>,)

I have a fix in mind for this and other ast.py incompatibilities. My
current implementation is based on a fundemental mistake: I use the same
ast for internals as I use for ast.py. I plan to create a pure Python
ast for ast.py and make the internal ast a pure antlr beast (not a
PyObject). Making ast.py much more compatible should be easy from there.
It's a medium sized project though -- will probably be a few weeks
before I can get to it.

Deferring to 2.6

Any chance of having this fixed soon?

Fixed. http://hg.python.org/jython/rev/b3f5c51c0a83 I went with a simpler approach instead of a rewrite :)