{"ast_node_type":"other","tokens":[{"end":45,"kind":"keyword","start":0,"text":"use_trees.sort_unstable_by(use_tree_cmp);"}]}
    use_trees.sort_unstable_by(use_tree_cmp);
    // (see `use_tree_cmp` doc).
    for rhs_t in rhs.use_tree_list().into_iter().flat_map(|list| list.use_trees()) {