mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-22 23:04:33 +00:00
22 lines
655 B
Rust
22 lines
655 B
Rust
// run-pass
|
|
#[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) });
|
|
}
|