src/test/run-pass/issue-18188.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 // pretty-expanded FIXME #23616
  12
  13 #![feature(unboxed_closures, std_misc)]
  14
  15 use std::thunk::Thunk;
  16
  17 pub trait Promisable: Send + Sync {}
  18 impl<T: Send + Sync> Promisable for T {}
  19 pub fn propagate<'a, T, E, F, G>(action: F) -> Thunk<'a, (Result<T, E>,), Result<T, E>>
  20     where
  21         T: Promisable + Clone + 'a,
  22         E: Promisable + Clone + 'a,
  23         F: FnOnce(&T) -> Result<T, E> + Send + 'a,
  24         G: FnOnce(Result<T, E>) -> Result<T, E> + 'a {
  25     Box::new(move |result: Result<T, E>| {
  26         match result {
  27             Ok(ref t) => action(t),
  28             Err(ref e) => Err(e.clone()),
  29         }
  30     })
  31 }
  32
  33 fn main() {}