src/test/ui/issues/issue-45697.rs

   1 // Test that assignments to an `&mut` pointer which is found in a
   2 // borrowed (but otherwise non-aliasable) location is illegal.
   3
   4 // compile-flags: -C overflow-checks=off
   5
   6 struct S<'a> {
   7     pointer: &'a mut isize
   8 }
   9
  10 fn copy_borrowed_ptr<'a>(p: &'a mut S<'a>) -> S<'a> {
  11     S { pointer: &mut *p.pointer }
  12 }
  13
  14 fn main() {
  15     let mut x = 1;
  16
  17     {
  18         let mut y = S { pointer: &mut x };
  19         let z = copy_borrowed_ptr(&mut y);
  20         *y.pointer += 1;
  21         //~^ ERROR cannot use `*y.pointer` because it was mutably borrowed [E0503]
  22         //~| ERROR cannot assign to `*y.pointer` because it is borrowed [E0506]
  23         *z.pointer += 1;
  24     }
  25 }