{"ast_node_type":"other","tokens":[{"end":45,"kind":"keyword","start":0,"text":"&ty::FnDef(def_id,"}]}
                &ty::FnDef(def_id, args) => {
            let instance = match mono_type.kind() {
                    Instance::expect_resolve(cx.tcx(), cx.typing_env(), def_id, args, value.span)