| {starstar} expr [op]:starstar [expr2]:expr
| {slash} expr [op]:slash [expr2]:expr
| {percent} expr [op]:percent [expr2]:expr
| {starstar} expr [op]:starstar [expr2]:expr
| {slash} expr [op]:slash [expr2]:expr
| {percent} expr [op]:percent [expr2]:expr
| {new} kwnew type id? [args]:exprs
| {attr} expr [id]:attrid
| {attr_assign} expr [id]:attrid assign [value]:expr
| {new} kwnew type id? [args]:exprs
| {attr} expr [id]:attrid
| {attr_assign} expr [id]:attrid assign [value]:expr