src/test/run-pass/unboxed-closures-prelude.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 // Tests that the reexports of `FnOnce` et al from the prelude work.
  12
  13 #![allow(unknown_features)]
  14 #![feature(box_syntax)]
  15 #![feature(unboxed_closures)]
  16
  17 fn main() {
  18     let task: Box<Fn(int) -> int> = box |x| x;
  19     task.call((0, ));
  20
  21     let mut task: Box<FnMut(int) -> int> = box |x| x;
  22     task(0);
  23
  24     call(|x| x, 22);
  25 }
  26
  27 fn call<F:FnOnce(int) -> int>(f: F, x: int) -> int {
  28     f(x)
  29 }
  30