{"ast_node_type":"other","tokens":[{"end":66,"kind":"keyword","start":0,"text":"const"}]}
    const BIG: u128 = 0xDEAD_C0FE_BEEF_DECAF_BADD_DECAF_BEEF_u128;
    // 2nd check that *large* values work.
    let val = black_box(BIG);