https://gcc.gnu.org/bugzilla/show_bug.cgi?id=19808
--- Comment #25 from Anthony Brandon <anthony.brandon at gmail dot com> --- Never mind the second question, I found walk_tree.
anthony.brandon at gmail dot com Sun, 16 Nov 2014 11:15:32 -0800
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=19808
--- Comment #25 from Anthony Brandon <anthony.brandon at gmail dot com> --- Never mind the second question, I found walk_tree.