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1 | // Copyright 2014 The Rust Project Developers. See the COPYRIGHT |
2 | // file at the top-level directory of this distribution and at | |
3 | // http://rust-lang.org/COPYRIGHT. | |
4 | // | |
5 | // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | |
6 | // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | |
7 | // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | |
8 | // option. This file may not be copied, modified, or distributed | |
9 | // except according to those terms. | |
10 | ||
1a4d82fc | 11 | #![allow(unknown_features)] |
1a4d82fc JJ |
12 | |
13 | struct Parser<'a, I, O> { | |
85aaf69f | 14 | parse: Box<FnMut(I) -> Result<O, String> + 'a> |
1a4d82fc JJ |
15 | } |
16 | ||
85aaf69f | 17 | impl<'a, I: 'a, O: 'a> Parser<'a, I, O> { |
1a4d82fc | 18 | fn compose<K: 'a>(mut self, mut rhs: Parser<'a, O, K>) -> Parser<'a, I, K> { |
c34b1796 | 19 | // FIXME (#22405): Replace `Box::new` with `box` here when/if possible. |
1a4d82fc | 20 | Parser { |
c34b1796 | 21 | parse: Box::new(move |x: I| { |
1a4d82fc JJ |
22 | match (self.parse)(x) { |
23 | Ok(r) => (rhs.parse)(r), | |
24 | Err(e) => Err(e) | |
25 | } | |
c34b1796 | 26 | }) |
1a4d82fc JJ |
27 | } |
28 | } | |
29 | } | |
30 | ||
31 | fn main() {} |