 					switch oldArguments[index] {
 					case let .Value(value):
 						foundValue = value
-						continue argumentLoop
+						continue
 
 					default:
 						break

	/// Returns the next positional argument that hasn't yet been returned, or
	/// nil if there are no more positional arguments.
	internal func consumePositionalArgument() -> String? {
		for var index = 0; index < rawArguments.count; index++ {
			switch rawArguments[index] {
			case let .Value(value):
				rawArguments.removeAtIndex(index)
				return value

		rawArguments.removeAll()

		var foundValue: String?
		var index = 0

		while index < oldArguments.count {
			defer { index++ }

			let arg = oldArguments[index]

			if arg == .Key(key) {
