3 struct Parser<'a, I, O> {
4 parse: Box<dyn FnMut(I) -> Result<O, String> + 'a>
7 impl<'a, I: 'a, O: 'a> Parser<'a, I, O> {
8 fn compose<K: 'a>(mut self, mut rhs: Parser<'a, O, K>) -> Parser<'a, I, K> {
10 parse: Box::new(move |x: I| {
11 match (self.parse)(x) {
12 Ok(r) => (rhs.parse)(r),