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ISTM there are a couple of problems.  Some of these were
likely in there before and I may have told you to do some.
:-(  I probably made the same error too. :-( :-(

One is a new one though.  That starts in the for loop.  You
break in there, but that only breaks out of the for loop,
doesn't it?  So you really need a goto to break out I think.

After setting except_st, it holds references to body,
handlers, and orelse, so if you free except_st, it should
free all the others.  Therefore if except_st was created
(after the if (except_st) break;), you should set body =
handlers = orelse = NULL;  Do you agree?  I think if you
don't you will get a double free.

The same would go for after you asdl_seq_SET(inner, 0,
except_st); you should set except_st = NULL;

OTOH, you fixed a memory leak.  Whenever one does return
TryExcept(); (or any other similar AST call), if TryExcept
fails, we will return NULL and all the local variables will
be leaked.

*sigh*  Sorry you have to deal with this crap.  You've been
a very good guinea pig being the first.  I really hope we do
the arenas as discussed on python-dev.  If you aren't too
burnt out, it would be a really good way to learn the rest
of the AST. :-)