using System;

public class Program

{

    public static void Main()

    {

        Span<Range> test = stackalloc Range[5];

        var enumerator = new BasicEnumerator(test.GetEnumerator());

​

        foreach (Range r in enumerator)

        {

            Console.WriteLine(r);

        }

    }

}

​

public ref struct BasicEnumerator

{

    // Encapsulated enumerator

    private Span<Range>.Enumerator _enumerator;

​

    public Range Current => _enumerator.Current;

​

    public BasicEnumerator(Span<Range>.Enumerator enumerator)

    {

        _enumerator = enumerator;

    }

​

    public bool MoveNext() => _enumerator.MoveNext();

​

    // Called by foreach

    public BasicEnumerator GetEnumerator() => this;

}