| // Copyright 2012 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. |
| |
| #[derive(PartialEq, Debug)] |
| pub struct Partial<T> { x: T, y: T } |
| |
| #[derive(PartialEq, Debug)] |
| struct S { val: isize } |
| impl S { fn new(v: isize) -> S { S { val: v } } } |
| impl Drop for S { fn drop(&mut self) { } } |
| |
| pub fn f<T, F>((b1, b2): (T, T), mut f: F) -> Partial<T> where F: FnMut(T) -> T { |
| let p = Partial { x: b1, y: b2 }; |
| |
| // Move of `p` is legal even though we are also moving `p.y`; the |
| // `..p` moves all fields *except* `p.y` in this context. |
| Partial { y: f(p.y), ..p } |
| } |
| |
| pub fn main() { |
| let p = f((S::new(3), S::new(4)), |S { val: z }| S::new(z+1)); |
| assert_eq!(p, Partial { x: S::new(3), y: S::new(5) }); |
| } |
