/// Conforming to the Sequence Protocol /// =================================== /// /// Making your own custom types conform to `Sequence` enables many useful /// operations, like `for`-`in` looping and the `contains` method, without /// much effort. To add `Sequence` conformance to your own custom type, add a /// `makeIterator()` method that returns an iterator. /// /// Alternatively, if your type can act as its own iterator, implementing the /// requirements of the `IteratorProtocol` protocol and declaring conformance /// to both `Sequence` and `IteratorProtocol` are sufficient.