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