tests/ui/issues/issue-67039-unsound-pin-partialeq.rs

   1 // Pin's PartialEq implementation allowed to access the pointer allowing for
   2 // unsoundness by using Rc::get_mut to move value within Rc.
   3 // See https://internals.rust-lang.org/t/unsoundness-in-pin/11311/73 for more details.
   4
   5 use std::ops::Deref;
   6 use std::pin::Pin;
   7 use std::rc::Rc;
   8
   9 struct Apple;
  10
  11 impl Deref for Apple {
  12     type Target = Apple;
  13     fn deref(&self) -> &Apple {
  14         &Apple
  15     }
  16 }
  17
  18 impl PartialEq<Rc<Apple>> for Apple {
  19     fn eq(&self, _rc: &Rc<Apple>) -> bool {
  20         unreachable!()
  21     }
  22 }
  23
  24 fn main() {
  25     let _ = Pin::new(Apple) == Rc::pin(Apple);
  26     //~^ ERROR type mismatch resolving
  27 }