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[rustc.git] / src / test / compile-fail / unboxed-closures-fnmut-as-fn.rs
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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// Checks that the Fn trait hierarchy rules do not permit
12// Fn to be used where FnMut is implemented.
13
14#![feature(unboxed_closures)]
15#![feature(overloaded_calls)]
16
17use std::ops::{Fn,FnMut,FnOnce};
18
19struct S;
20
85aaf69f 21impl FnMut<(isize,)> for S {
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22 extern "rust-call" fn call_mut(&mut self, (x,): (isize,)) -> isize {
23 x * x
24 }
25}
26
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27impl FnOnce<(isize,)> for S {
28 type Output = isize;
29
30 extern "rust-call" fn call_once(mut self, args: (isize,)) -> isize { self.call_mut(args) }
31}
32
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33fn call_it<F:Fn(isize)->isize>(f: &F, x: isize) -> isize {
34 f.call((x,))
35}
36
37fn main() {
85aaf69f 38 let x = call_it(&S, 22);
54a0048b 39 //~^ ERROR E0277
1a4d82fc 40}