{"ast_node_type":"other","tokens":[{"end":77,"kind":"keyword","start":0,"text":"output_ty"}]}
            output_ty = self.infcx.tcx.type_of(def_id).instantiate_identity()
        if let ty::Alias(ty::Opaque, ty::AliasTy { def_id, .. }) = *output_ty.kind() {
        };