LazySequence.swift

public extension LazySequence {
    /// Create an infinitely repeating sequence of values identical to `value`.
    ///
    ///     let names = ["Jane", "Jack", "Gwynne", "Micky"]
    ///     let hellos = LazySequence(repeating: "Hello")
    ///     let g = zip(hellos, names).map { "\($0), \($1)" }
    ///     g == ["Hello, Jane", "Hello, Jack", "Hello, Gwynne", "Hello, Micky"]
    ///
    /// - Parameter repeating: `repeating` takes the element to be repeated.
    /// - Returns: An infinite lazy sequence of `value`.
    init<T>(repeating value: T) where Base == AnyIterator<T> {
        self = AnyIterator { value }.lazy
    }
}