| {bra} expr [args]:expr* [closure_defs]:closure_def*
| {bra_assign} expr [args]:expr* assign [value]:expr
| {bra_reassign} expr [args]:expr* assign_op [value]:expr
+ | {closure_call} id [args]:expr* [closure_defs]:closure_def*
| {var} id
| {var_assign} id assign [value]:expr
| {var_reassign} id assign_op [value]:expr