src/test/compile-fail/fn-trait-formatting.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 #![feature(unboxed_closures)]
  12 #![feature(box_syntax)]
  13
  14 fn needs_fn<F>(x: F) where F: Fn(isize) -> isize {}
  15
  16 fn main() {
  17     let _: () = (box |_: isize| {}) as Box<FnOnce(isize)>;
  18     //~^ ERROR mismatched types
  19     //~| expected `()`
  20     //~| found `Box<std::ops::FnOnce(isize)>`
  21     //~| expected ()
  22     //~| found box
  23     let _: () = (box |_: isize, isize| {}) as Box<Fn(isize, isize)>;
  24     //~^ ERROR mismatched types
  25     //~| expected `()`
  26     //~| found `Box<std::ops::Fn(isize, isize)>`
  27     //~| expected ()
  28     //~| found box
  29     let _: () = (box || -> isize { unimplemented!() }) as Box<FnMut() -> isize>;
  30     //~^ ERROR mismatched types
  31     //~| expected `()`
  32     //~| found `Box<std::ops::FnMut() -> isize>`
  33     //~| expected ()
  34     //~| found box
  35
  36     needs_fn(1);
  37     //~^ ERROR : std::ops::Fn<(isize,)>`
  38     //~| ERROR : std::ops::FnOnce<(isize,)>`
  39 }