dnl "m4.texinfo": 942: Origin here
define(`foo', `Hello World.')
dnl =>
define(`echo', `$@')
dnl =>
traceon(`foo', `echo')
dnl =>
foo
dnl *>m4 trace (1): foo -> `Hello World.'
dnl =>Hello World.
echo(gnus, and gnats)
dnl *>m4 trace (1): echo( `gnus', `and gnats' ) -> ``gnus', `and gnats''
dnl =>gnus, and gnats
