macOS 11.0 introduced an overload of Publisher.flatMap(maxPublishers:_:)
for when the failure type is Never, documented here:
https://developer.apple.com/documentation/combine/publisher/flatmap(maxpublishers:_:)-qxf
This causes a compiler error in Effect.fireAndForget when the minimum
deployment target is 11.0 or later:
Sources/ComposableArchitecture/Effect.swift:364:7: error: ambiguous use of 'flatMap(maxPublishers:_:)'
self
^
Combine.Publisher:3:17: note: found this candidate
public func flatMap<T, P>(maxPublishers: Subscribers.Demand = .unlimited, _ transform: @escaping (Self.Output) -> P) -> Publishers.FlatMap<P, Self> where T == P.Output, P : Publisher, Self.Failure == P.Failure
^
Combine.Publisher:3:17: note: found this candidate
public func flatMap<P>(maxPublishers: Subscribers.Demand = .unlimited, _ transform: @escaping (Self.Output) -> P) -> Publishers.FlatMap<Publishers.SetFailureType<P, Self.Failure>, Self> where P : Publisher, P.Failure == Never
^
We can fix this by adding explicit type parameters to the Empty
publisher used in the flatMap().
