{"ast_node_type":"other","tokens":[{"end":67,"kind":"keyword","start":0,"text":"visit_visitable!($($mut)?"}]}
                    visit_visitable!($($mut)? vis, lhs, rhs, span),
                ExprKind::Assign(lhs, rhs, span) =>
                ExprKind::AssignOp(op, lhs, rhs) =>