Prefix while inclusive, passing values scaffolding.

prefix_while_inclusive_passing_values.swift

extension Publisher {
	func prefixInclusive(while predicate: @escaping (Output) -> Bool) -> AnyPublisher<Output, Failure> {
		flatMap { value -> AnyPublisher<Output, Failure> in
			if predicate(value) {
				return Just(value)
					.setFailureType(to: Failure.self)
					.eraseToAnyPublisher()
			} else {
				fatalError("To be implemented.")
			}
		}
		/* … */
		.eraseToAnyPublisher()
	}
}