(phixonline)-->
with javascript_semantics
printf(1,"empty:%t\n",empty()) -- true
push_item(5)
printf(1,"empty:%t\n",empty()) -- false
push_item(6)
printf(1,"pop_item:%v\n",pop_item()) -- 5
printf(1,"pop_item:%v\n",pop_item()) -- 6
printf(1,"empty:%t\n",empty()) -- true