| fn prove_static<T: 'static + ?Sized>(_: &'static T) {} |
| |
| fn lifetime_transmute_slice<'a, T: ?Sized>(x: &'a T, y: &T) -> &'a T { |
| let mut out = [x]; |
| { |
| let slice: &mut [_] = &mut out; |
| slice[0] = y; |
| } |
| out[0] |
| //~^ ERROR explicit lifetime required in the type of `y` [E0621] |
| } |
| |
| struct Struct<T, U: ?Sized> { |
| head: T, |
| _tail: U |
| } |
| |
| fn lifetime_transmute_struct<'a, T: ?Sized>(x: &'a T, y: &T) -> &'a T { |
| let mut out = Struct { head: x, _tail: [()] }; |
| { |
| let dst: &mut Struct<_, [()]> = &mut out; |
| dst.head = y; |
| } |
| out.head |
| //~^ ERROR explicit lifetime required in the type of `y` [E0621] |
| } |
| |
| fn main() { |
| prove_static(lifetime_transmute_slice("", &String::from("foo"))); |
| prove_static(lifetime_transmute_struct("", &String::from("bar"))); |
| } |
