total_size_in_words = sizeofW(StgArrWords) + data_size_in_words;
/* allocate and fill it in */
arr = (StgArrWords *)allocate(total_size_in_words);
total_size_in_words = sizeofW(StgArrWords) + data_size_in_words;
/* allocate and fill it in */
arr = (StgArrWords *)allocate(total_size_in_words);