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8bb4bdeb | 1 | // Copyright 2017 The Rust Project Developers. See the COPYRIGHT |
223e47cc LB |
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 | ||
ea8adc8c | 11 | // Check that closures implement `Copy`. |
3b2f2976 | 12 | |
ea8adc8c | 13 | fn call<T, F: FnOnce() -> T>(f: F) -> T { f() } |
3b2f2976 | 14 | |
7453a54e | 15 | fn main() { |
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16 | let a = 5; |
17 | let hello = || { | |
18 | println!("Hello {}", a); | |
19 | a | |
20 | }; | |
3b2f2976 | 21 | |
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22 | assert_eq!(5, call(hello.clone())); |
23 | assert_eq!(5, call(hello)); | |
24 | assert_eq!(5, call(hello)); | |
223e47cc | 25 | } |