{"ast_node_type":"function","tokens":[{"end":46,"kind":"keyword","start":0,"text":"fn"}]}
    fn parse_index(s: &str) -> Option<usize> {
fn toml_pointer<'a>(toml: &'a toml::Table, pointer: &str) -> Option<&'a toml::Value> {
        if s.starts_with('+') || (s.starts_with('0') && s.len() != 1) {