src/test/compile-fail/unboxed-closures-wrong-abi.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 unsafe extern fn pointers do not implement any Fn traits.
  12
  13 #![feature(unboxed_closures)]
  14
  15 use std::ops::{Fn,FnMut,FnOnce};
  16
  17 extern "C" fn square(x: &isize) -> isize { (*x) * (*x) }
  18
  19 fn call_it<F:Fn(&isize)->isize>(_: &F, _: isize) -> isize { 0 }
  20 fn call_it_mut<F:FnMut(&isize)->isize>(_: &mut F, _: isize) -> isize { 0 }
  21 fn call_it_once<F:FnOnce(&isize)->isize>(_: F, _: isize) -> isize { 0 }
  22
  23 fn a() {
  24     let x = call_it(&square, 22);
  25     //~^ ERROR E0277
  26     //~| ERROR E0277
  27 }
  28
  29 fn b() {
  30     let y = call_it_mut(&mut square, 22);
  31     //~^ ERROR E0277
  32     //~| ERROR E0277
  33 }
  34
  35 fn c() {
  36     let z = call_it_once(square, 22);
  37     //~^ ERROR E0277
  38 }
  39
  40 fn main() { }