mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-27 17:24:06 +00:00
32 lines
813 B
Rust
32 lines
813 B
Rust
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")));
|
|
}
|