-- ( tycon == byteArrayTyCon ||
-- tycon == mutableByteArrayTyCon )
= newSysLocalsDs data_con_arg_tys `thenDs` \ vars@[ixs_var, arr_cts_var] ->
-- ( tycon == byteArrayTyCon ||
-- tycon == mutableByteArrayTyCon )
= newSysLocalsDs data_con_arg_tys `thenDs` \ vars@[ixs_var, arr_cts_var] ->