// 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 or the MIT license // , at your // option. This file may not be copied, modified, or distributed // except according to those terms. #[derive(PartialEq, Debug)] pub struct Partial { 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((b1, b2): (T, T), mut f: F) -> Partial 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) }); }