rust/src/test/compile-fail/unboxed-closures-wrong-abi.rs

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// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
// Tests that unsafe extern fn pointers do not implement any Fn traits.
use std::ops::{Fn,FnMut,FnOnce};
extern "C" fn square(x: &isize) -> isize { (*x) * (*x) }
fn call_it<F:Fn(&isize)->isize>(_: &F, _: isize) -> isize { 0 }
fn call_it_mut<F:FnMut(&isize)->isize>(_: &mut F, _: isize) -> isize { 0 }
fn call_it_once<F:FnOnce(&isize)->isize>(_: F, _: isize) -> isize { 0 }
fn a() {
let x = call_it(&square, 22);
//~^ ERROR E0277
}
fn b() {
let y = call_it_mut(&mut square, 22);
//~^ ERROR E0277
}
fn c() {
let z = call_it_once(square, 22);
//~^ ERROR E0277
}
fn main() { }