27 lines
556 B
Rust
27 lines
556 B
Rust
use std::marker::PhantomData;
|
|
|
|
#[derive(PartialEq, Eq)]
|
|
pub struct InvariantRef<'a, T: ?Sized>(&'a T, PhantomData<&'a mut &'a T>);
|
|
|
|
impl<'a, T: ?Sized> InvariantRef<'a, T> {
|
|
pub const fn new(r: &'a T) -> Self {
|
|
InvariantRef(r, PhantomData)
|
|
}
|
|
}
|
|
|
|
impl<'a> InvariantRef<'a, ()> {
|
|
pub const NEW: Self = InvariantRef::new(&());
|
|
}
|
|
|
|
fn equate<T>(x: T, y: T){}
|
|
|
|
fn foo<'a>() {
|
|
let y = ();
|
|
equate(InvariantRef::new(&y), const { InvariantRef::<'a>::NEW });
|
|
//~^ ERROR `y` does not live long enough [E0597]
|
|
}
|
|
|
|
fn main() {
|
|
foo();
|
|
}
|