{"ast_node_type":"other","tokens":[{"end":43,"kind":"keyword","start":0,"text":"AssocOp::AssignOp(aop)"}]}
                AssocOp::AssignOp(aop) => {
                AssocOp::Assign => self.mk_expr(span, ExprKind::Assign(lhs, rhs, cur_op_span)),
                    let aopexpr = self.mk_assign_op(source_map::respan(cur_op_span, aop), lhs, rhs);