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 // pretty-expanded FIXME #23616
  14
  15 fn main() {
  16     let task: Box<Fn(isize) -> isize> = Box::new(|x| x);
  17     task(0);
  18
  19     let mut task: Box<FnMut(isize) -> isize> = Box::new(|x| x);
  20     task(0);
  21
  22     call(|x| x, 22);
  23 }
  24
  25 fn call<F:FnOnce(isize) -> isize>(f: F, x: isize) -> isize {
  26     f(x)
  27 }