{"ast_node_type":"function","tokens":[{"end":42,"kind":"keyword","start":0,"text":"fn"}]}
fn pwr2_to_exponent(num: u128) -> String {
/// of 2, or this function will panic.
    const DIGITS: [char; 10] = ['⁰', '¹', '²', '³', '⁴', '⁵', '⁶', '⁷', '⁸', '⁹'];