{"ast_node_type":"other","tokens":[{"end":73,"kind":"keyword","start":0,"text":")"}]}
) -> (&'tcx [Spanned<MonoItem<'tcx>>], &'tcx [Spanned<MonoItem<'tcx>>]) {
    (instance, mode): (Instance<'tcx>, CollectionMode),
    let (used_items, mentioned_items) = collect_items_of_instance(tcx, instance, mode);