 	}
 }
 
-extension ActionProtocol where Input == Void {
+extension Action where Input == Void {
 	/// Initializes an action that uses an `Optional` property for its input,
 	/// and is disabled whenever the input is `nil`. When executed, a `SignalProducer`
 	/// is created with the current value of the input.

	///            whenever the action is executed.
	///   - execute: A closure to return a new `SignalProducer` based on the
	///              current value of `input`.
	public init<P: PropertyProtocol, T>(input: P, _ execute: @escaping (T) -> SignalProducer<Output, Error>) where P.Value == T {
		self.init(input: input.map(Optional.some), execute)
	}
}

	///            whenever the value is `nil`.
	///   - execute: A closure to return a new `SignalProducer` based on the
	///              current value of `input`.
	public convenience init<P: PropertyProtocol, T>(input: P, _ execute: @escaping (T) -> SignalProducer<Output, Error>) where P.Value == T? {
		self.init(state: input, enabledIf: { $0 != nil }) { input, _ in
			execute(input!)
		}
