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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 | ||
17 | use std::ops::{Fn,FnMut,FnOnce}; | |
18 | ||
19 | struct S; | |
20 | ||
85aaf69f | 21 | impl FnMut<(isize,)> for S { |
1a4d82fc JJ |
22 | extern "rust-call" fn call_mut(&mut self, (x,): (isize,)) -> isize { |
23 | x * x | |
24 | } | |
25 | } | |
26 | ||
c34b1796 AL |
27 | impl 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 | ||
1a4d82fc JJ |
33 | fn call_it<F:Fn(isize)->isize>(f: &F, x: isize) -> isize { |
34 | f.call((x,)) | |
35 | } | |
36 | ||
37 | fn main() { | |
85aaf69f | 38 | let x = call_it(&S, 22); |
54a0048b | 39 | //~^ ERROR E0277 |
1a4d82fc | 40 | } |