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Fix unit test that was illegally mutating an upvar
[rust.git] / src / test / run-pass / unboxed-closures-by-ref.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(overloaded_calls, unboxed_closures)]
12
13 // Test by-ref capture of environment in unboxed closure types
14
15 fn call_fn<F: Fn()>(f: F) {
16     f()
17 }
18
19 fn call_fn_mut<F: FnMut()>(mut f: F) {
20     f()
21 }
22
23 fn call_fn_once<F: FnOnce()>(f: F) {
24     f()
25 }
26
27 fn main() {
28     let mut x = 0u;
29     let y = 2u;
30
31     call_fn(|&:| assert_eq!(x, 0));
32     call_fn_mut(|&mut:| x += y);
33     call_fn_once(|:| x += y);
34     assert_eq!(x, y * 2);
35 }