{"ast_node_type":"variable","tokens":[{"end":63,"kind":"keyword","start":0,"text":"let"}]}
    let new_reg_count_v = bx.add(reg_count_v, bx.const_u64(1));
    // Update the register count.
    bx.store(new_reg_count_v, reg_count, Align::from_bytes(8).unwrap());