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#![feature(impl_trait_in_assoc_type)]
trait Callable {
type Output;
fn call(x: Self) -> Self::Output;
}
trait PlusOne {
fn plus_one(&mut self);
}
impl<'a> PlusOne for &'a mut i32 {
fn plus_one(&mut self) {
**self += 1;
}
}
impl<T: PlusOne> Callable for T {
type Output = impl PlusOne;
fn call(t: T) -> Self::Output {
t
}
}
fn test<'a>(y: &'a mut i32) -> impl PlusOne {
<&'a mut i32 as Callable>::call(y)
//~^ ERROR hidden type for `impl PlusOne` captures lifetime that does not appear in bounds
}
fn main() {
let mut z = 42;
let mut thing = test(&mut z);
let mut thing2 = test(&mut z);
thing.plus_one();
assert_eq!(z, 43);
thing2.plus_one();
assert_eq!(z, 44);
thing.plus_one();
assert_eq!(z, 45);
}
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