Type Alias FetchFuture 

type FetchFuture<'a> = BoxFuture<'a, (Key, Result<Arc<Outcome>, Failure>)>;

One in-flight fetch, borrowing the worker for the service’s lifetime and yielding its key alongside the result so the worker can route it.

Aliased Type

#[repr(transparent)]
struct FetchFuture<'a> { /* private fields */ }