{"ast_node_type":"function","tokens":[{"end":78,"kind":"keyword","start":0,"text":"fn"}]}
    fn new(iter: &'a mut Peekable<Lines<R>>, output: &'b mut String) -> Self {
impl<'a, 'b, R: BufRead> Converter<'a, 'b, R> {
        Self { iter, output }