Can a pushdef pop itself dependably?

    $ cat popself.m4 
    define(`foo', `bar')dnl
    pushdef(`foo', `arf popdef(`foo') foo and then goodbye.
    m4exit')dnl
    $ gm4 popself.m4 -
    foo
    arf  bar and then goodbye.
    $


Can I depend on this sort of behavior ... that a pushdef can pop itself 
in the middle
and the revealed definition execute and the popped def finishes off 
before vanishing?

-- 
Jack J. Woehr            # "Self-delusion is
http://www.well.com/~jax #  half the battle!"
http://www.softwoehr.com #  - Zippy the Pinhead