blob: 9da904acf1f2b0e85fb58741b3ea467b29d784aa (
plain)
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
|
use std::ops::Deref;
struct MyPtr<'a>(&'a mut usize);
impl<'a> Deref for MyPtr<'a> {
type Target = usize;
fn deref<'b>(&'b self) -> &'b usize { self.0 }
}
trait Tr {
fn poke(&self, s: &mut usize);
}
impl Tr for usize {
fn poke(&self, s: &mut usize) {
*s = 2;
}
}
fn main() {
let s = &mut 1;
MyPtr(s).poke(s);
//~^ ERROR cannot borrow `*s` as mutable more than once at a time
}
|
