src/test/ui/run-pass/issues/issue-16668.rs

   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
  11 // run-pass
  12 struct Parser<'a, I, O> {
  13     parse: Box<FnMut(I) -> Result<O, String> + 'a>
  14 }
  15
  16 impl<'a, I: 'a, O: 'a> Parser<'a, I, O> {
  17     fn compose<K: 'a>(mut self, mut rhs: Parser<'a, O, K>) -> Parser<'a, I, K> {
  18         Parser {
  19             parse: Box::new(move |x: I| {
  20                 match (self.parse)(x) {
  21                     Ok(r) => (rhs.parse)(r),
  22                     Err(e) => Err(e)
  23                 }
  24             })
  25         }
  26     }
  27 }
  28
  29 fn main() {}