dnl ../doc/m4.texinfo:1205: Origin of test define(`foo', `Expansion one.') dnl @result{} foo dnl @result{}Expansion one. pushdef(`foo', `Expansion two.') dnl @result{} foo dnl @result{}Expansion two. popdef(`foo') dnl @result{} foo dnl @result{}Expansion one. popdef(`foo') dnl @result{} foo dnl @result{}foo