| // 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. |
| |
| // Test that we can infer the "kind" of an unboxed closure based on |
| // the expected type. |
| |
| |
| #![feature(unboxed_closures)] |
| |
| // Test by-ref capture of environment in unboxed closure types |
| |
| fn call_fn<F: Fn()>(f: F) { |
| f() |
| } |
| |
| fn call_fn_mut<F: FnMut()>(mut f: F) { |
| f() |
| } |
| |
| fn call_fn_once<F: FnOnce()>(f: F) { |
| f() |
| } |
| |
| fn main() { |
| let mut x = 0_usize; |
| let y = 2_usize; |
| |
| call_fn(|| assert_eq!(x, 0)); |
| call_fn_mut(|| x += y); |
| call_fn_once(|| x += y); |
| assert_eq!(x, y * 2); |
| } |