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#![feature(type_alias_impl_trait)]
// edition:2018
use std::future::Future;
pub trait Service<Request> {
type Future: Future<Output = ()>;
fn call(&mut self, req: Request) -> Self::Future;
}
// NOTE: the pub(crate) here is critical
pub(crate) fn new() -> () {}
pub struct A;
impl Service<()> for A {
type Future = impl Future<Output = ()>;
fn call(&mut self, _: ()) -> Self::Future {
async { new() }
}
}
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