{"ast_node_type":"function","tokens":[{"end":36,"kind":"keyword","start":0,"text":"fn"}]}
fn to_seq_id(num: usize) -> String {
/// <https://itanium-cxx-abi.github.io/cxx-abi/abi.html#mangle.seq-id>).
    if let Some(num) = num.checked_sub(1) {