{"ast_node_type":"other","tokens":[{"end":49,"kind":"keyword","start":0,"text":"MonoItem::Fn(ref"}]}
                MonoItem::Fn(ref instance_s) => {
            usage_map.used_map.get(&item).unwrap().into_iter().find_map(|item| match *item {
                    let source_id = instance_s.def_id();