[Pitch] `Never` as the parameter type for function that does not take a parameter

[sveinhal (Svein Halvor Halvorsen)]

@Joe_Groff

But in the fullness of time, this is something that variadic generics would address, since you could define the original protocol as:

struct PassthroughSubject<Output...> {
  func send(_ outputs: Output...)
}

and that would let you call it as send() for no arguments, send(x) for one argument, or send(x, y) for multiple arguments, without micromanaging the overload set.

If SE-0347 gets accepted we could perhaps also use default arguments?

struct PassthroughSubject<Output> {
  func send(_ output: Output = ())
}