/
issue-16668.rs
32 lines (27 loc) · 978 Bytes
/
issue-16668.rs
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
// ignore-pretty
#![feature(unboxed_closures)]
struct Parser<'a, I, O> {
parse: Box<FnMut<(I,), Result<O, String>> + 'a>
}
impl<'a, I, O: 'a> Parser<'a, I, O> {
fn compose<K: 'a>(mut self, mut rhs: Parser<O, K>) -> Parser<'a, I, K> {
Parser {
parse: box move |&mut: x: I| {
match self.parse.call_mut((x,)) {
Ok(r) => rhs.parse.call_mut((r,)),
Err(e) => Err(e)
}
}
}
}
}
fn main() {}