tests/ui/nll/issue-55651.rs

   1 // check-pass
   2
   3 use std::mem::ManuallyDrop;
   4
   5 struct A;
   6 struct B;
   7
   8 union U {
   9     a: ManuallyDrop<A>,
  10     b: ManuallyDrop<B>,
  11 }
  12
  13 fn main() {
  14     unsafe {
  15         {
  16             let mut u = U { a: ManuallyDrop::new(A) };
  17             let a = u.a;
  18             u.a = ManuallyDrop::new(A);
  19             let a = u.a; // OK
  20         }
  21         {
  22             let mut u = U { a: ManuallyDrop::new(A) };
  23             let a = u.a;
  24             u.b = ManuallyDrop::new(B);
  25             let a = u.a; // OK
  26         }
  27     }
  28 }