Non-`AnyObject` constrained forms of `Publisher.withLatestFrom`.

struct_with_latest_from.swift

import Combine

extension Publisher {
	func withLatestFrom<Other: Publisher>(
		_ other: Other
	) -> AnyPublisher<Other.Output, Other.Failure>
	where Failure == Other.Failure {
		other
			.map { second in map { _ in second } }
			.switchToLatest()
			.eraseToAnyPublisher()
	}
}

extension Publisher {
	func withLatestFrom<Other: Publisher, Transformed>(
		_ other: Other,
		_ selector: @escaping (Output, Other.Output) -> Transformed
	) -> AnyPublisher<Transformed, Other.Failure>
	where Failure == Other.Failure {
		other
			.map { second in map { first in selector(first, second) } }
			.switchToLatest()
			.eraseToAnyPublisher()
	}
}