src/test/ui/issues/issue-40288-2.rs

   1 fn prove_static<T: 'static + ?Sized>(_: &'static T) {}
   2
   3 fn lifetime_transmute_slice<'a, T: ?Sized>(x: &'a T, y: &T) -> &'a T {
   4     let mut out = [x];
   5     {
   6         let slice: &mut [_] = &mut out;
   7         slice[0] = y;
   8     }
   9     out[0]
  10     //~^ ERROR explicit lifetime required in the type of `y` [E0621]
  11 }
  12
  13 struct Struct<T, U: ?Sized> {
  14     head: T,
  15     _tail: U
  16 }
  17
  18 fn lifetime_transmute_struct<'a, T: ?Sized>(x: &'a T, y: &T) -> &'a T {
  19     let mut out = Struct { head: x, _tail: [()] };
  20     {
  21         let dst: &mut Struct<_, [()]> = &mut out;
  22         dst.head = y;
  23     }
  24     out.head
  25     //~^ ERROR explicit lifetime required in the type of `y` [E0621]
  26 }
  27
  28 fn main() {
  29     prove_static(lifetime_transmute_slice("", &String::from("foo")));
  30     prove_static(lifetime_transmute_struct("", &String::from("bar")));
  31 }