{"ast_node_type":"function","tokens":[{"end":87,"kind":"keyword","start":0,"text":"//"}]}
        // an RPITIT (return-position impl trait in trait) or AFIT (async fn in trait).
        // Next, we need to check that the return-type notation is being used on
        let output = tcx.fn_sig(item_def_id).skip_binder().output();