{"ast_node_type":"other","tokens":[{"end":52,"kind":"keyword","start":0,"text":"*self_arg"}]}
        *self_arg = Ty::new_mut_ptr(tcx, *self_arg);
        debug_assert!(tcx.generics_of(def_id).has_self && *self_arg == tcx.types.self_param);
        sig.inputs_and_output = tcx.mk_type_list(&inputs_and_output);