{"ast_node_type":"variable","tokens":[{"end":70,"kind":"keyword","start":0,"text":"let"}]}
    let r = _mm256_setr_epi32(800, 700, 600, 500, 400, 300, 200, 100);
    let idx = _mm256_setr_epi32(7, 6, 5, 4, 3, 2, 1, 0);
    let e = _mm256_permutevar8x32_epi32(a, idx);