{"ast_node_type":"other","tokens":[{"end":77,"kind":"keyword","start":0,"text":"err.subdiagnostic(SuggestBoxingForReturnImplTrait::ChangeReturnType"}]}
        err.subdiagnostic(SuggestBoxingForReturnImplTrait::ChangeReturnType {
        let rpid_def_span = fcx.tcx.def_span(rpit_def_id);
            start_sp: rpid_def_span.with_hi(rpid_def_span.lo() + BytePos(4)),