{"ast_node_type":"variable","tokens":[{"end":66,"kind":"keyword","start":0,"text":"let"}]}
    let is_negative = is_signed && it.last().unwrap_or(&0) > &127;
pub fn pad16(it: &[u8], is_signed: bool) -> [u8; 16] {
    let mut res = [if is_negative { 255 } else { 0 }; 16];