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