{"ast_node_type":"other","tokens":[{"end":46,"kind":"keyword","start":0,"text":"walk_flat_map_item(P<Item>)"}]}
    walk_flat_map_item(P<Item>) => visit_item;
    walk_flat_map_expr_field(ExprField) => visit_expr_field;
    walk_flat_map_foreign_item(P<ForeignItem>) => visit_foreign_item;