into.swift

public extension Result {
	// Extract the value if it's a success
	var value: Success? {
		switch self {
		case let .success(value):
			return value
		case .failure:
			return nil
		}
	}

	// Extract the error if it's a failure
	var error: Failure? {
		switch self {
		case .success:
			return nil
		case let .failure(error):
			return error
		}
	}
}

public extension Result {
	func into(_ err: inout Error?) -> (Success?) {
		switch self {
		case let .success(value):
			return value
		case let .failure(error):
			err = error
			return nil
		}
	}
}