//@ edition:2021 | |
#![feature(type_alias_impl_trait)] | |
struct CallMe; | |
type ReturnType<'a> = impl std::future::Future<Output = u32> + 'a; | |
type FnType = impl Fn(&u32) -> ReturnType; | |
impl std::ops::Deref for CallMe { | |
type Target = FnType; | |
fn deref(&self) -> &Self::Target { | |
fn inner(val: &u32) -> ReturnType { | |
async move { *val * 2 } | |
} | |
&inner //~ ERROR: expected generic lifetime parameter, found `'_` | |
} | |
} | |
fn main() {} |