{"ast_node_type":"other","tokens":[{"end":51,"kind":"keyword","start":0,"text":"ExprKind::AssignOp(op,"}]}
                ExprKind::AssignOp(op, lhs, rhs) =>
                    visit_visitable!($($mut)? vis, lhs, rhs, span),
                    visit_visitable!($($mut)? vis, op, lhs, rhs),