Hello,
I just made this patch so I could debug and otherwise
poke around.
It allows elog_node_display() and friends to show
INSERT parse trees.
AFIK it works, in my use and after applying
to the latest cvs with:
   ./configure --enable-cassert ; make check
The patch does not have a corresponding regression
test.  I understand how to make a regular SQL-esque
regression test, but this is sorta a metadata kind
of test and I'm unclear on how to proceed or whether
there's even a testing framework for this sort of thing.
Karl <kop@meme.com>
Free Software:  "You don't pay back, you pay forward."
                  -- Robert A. Heinlein