3 #![feature(type_alias_impl_trait)]
5 use std::future::Future;
7 trait SearchableResource<Criteria> {
11 trait SearchableResourceExt<Criteria>: SearchableResource<Criteria> {
12 type Future<'f, A: 'f + ?Sized, B: 'f>: Future<Output = Result<Vec<A::SearchResult>, ()>> + 'f
14 A: SearchableResource<B>,
17 fn search<'c>(&'c self, client: &'c ()) -> Self::Future<'c, Self, Criteria>;
20 type SearchFutureTy<'f, A, B: 'f>
22 A: SearchableResource<B> + ?Sized + 'f,
23 = impl Future<Output = Result<Vec<A::SearchResult>, ()>> + 'f;
24 impl<T, Criteria> SearchableResourceExt<Criteria> for T
26 T: SearchableResource<Criteria>,
28 type Future<'f, A, B: 'f> = SearchFutureTy<'f, A, B>
30 A: SearchableResource<B> + ?Sized + 'f,
33 fn search<'c>(&'c self, _client: &'c ()) -> Self::Future<'c, Self, Criteria> {
34 async move { todo!() }
35 //~^ ERROR: the size for values of type `A` cannot be known at compilation time