{"ast_node_type":"other","tokens":[{"end":45,"kind":"keyword","start":0,"text":")"}]}
) -> Option<(UseTree, Arena<ast::UseTree>)> {
    span_for_range: &mut dyn FnMut(::tt::TextRange) -> SyntaxContext,
    let mut lowering = UseTreeLowering { db, mapping: Arena::new() };