src/test/ui/issues/issue-18566.rs

   1 use std::ops::Deref;
   2
   3 struct MyPtr<'a>(&'a mut usize);
   4 impl<'a> Deref for MyPtr<'a> {
   5     type Target = usize;
   6
   7     fn deref<'b>(&'b self) -> &'b usize { self.0 }
   8 }
   9
  10 trait Tr {
  11     fn poke(&self, s: &mut usize);
  12 }
  13
  14 impl Tr for usize {
  15     fn poke(&self, s: &mut usize)  {
  16         *s = 2;
  17     }
  18 }
  19
  20 fn main() {
  21     let s = &mut 1;
  22
  23     MyPtr(s).poke(s);
  24     //~^ ERROR cannot borrow `*s` as mutable more than once at a time
  25 }