1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
|
// Regression test for #30104
// check-pass
use std::ops::{Deref, DerefMut};
fn box_two_field(v: &mut Box<(i32, i32)>) {
let _a = &mut v.0;
let _b = &mut v.1;
}
fn box_destructure(v: &mut Box<(i32, i32)>) {
let (ref mut _head, ref mut _tail) = **v;
}
struct Wrap<T>(T);
impl<T> Deref for Wrap<T> {
type Target = T;
fn deref(&self) -> &T {
&self.0
}
}
impl<T> DerefMut for Wrap<T> {
fn deref_mut(&mut self) -> &mut T {
&mut self.0
}
}
fn smart_two_field(v: &mut Wrap<(i32, i32)>) {
let _a = &mut v.0;
let _b = &mut v.1;
}
fn smart_destructure(v: &mut Wrap<(i32, i32)>) {
let (ref mut _head, ref mut _tail) = **v;
}
fn main() {}
|
