{"ast_node_type":"other","tokens":[{"end":31,"kind":"keyword","start":0,"text":"ty::Adt(def,"}]}
        ty::Adt(def, args) => {
        //   even if the ADT is {meta,pointee,}sized for all possible args.
            if let Some(crit) = def.sizedness_constraint(ecx.cx(), sizedness) {