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#[macro_use]
extern crate rental;
//use std::marker::PhantomData;
pub struct Foo {
i: i32,
}
//pub struct Invariant<'a> {
// iref: &'a i32,
// inv: PhantomData<&'a mut &'a ()>,
//}
rental! {
mod rentals {
use super::*;
#[rental(covariant)]
pub struct SimpleRef {
foo: Box<Foo>,
iref: &'foo i32,
}
#[rental_mut(covariant)]
pub struct SimpleMut {
foo: Box<Foo>,
iref: &'foo mut i32,
}
// #[rental(covariant)]
// pub struct ShouldBreak {
// foo: Box<Foo>,
// inv: Invariant<'foo>,
// }
}
}
#[test]
fn borrow() {
let foo = Foo { i: 5 };
let fr = rentals::SimpleRef::new(Box::new(foo), |foo| &foo.i);
let b = fr.all();
assert_eq!(**b.iref, 5);
}
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