| 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 | |
| } |