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// check-pass
#![allow(dead_code)]
struct Parser<'a, I, O> {
parse: Box<dyn FnMut(I) -> Result<O, String> + 'a>
}
impl<'a, I: 'a, O: 'a> Parser<'a, I, O> {
fn compose<K: 'a>(mut self, mut rhs: Parser<'a, O, K>) -> Parser<'a, I, K> {
Parser {
parse: Box::new(move |x: I| {
match (self.parse)(x) {
Ok(r) => (rhs.parse)(r),
Err(e) => Err(e)
}
})
}
}
}
fn main() {}
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