Index and Range API stub

RangeStub.cs

namespace System
{
    public readonly partial struct Index : System.IEquatable<System.Index>
    {
        private readonly int _dummyPrimitive;
        public Index(int value, bool fromEnd) { throw null; }
        public int Value { get { throw null; } }
        public bool FromEnd { get { throw null; } }
        public override bool Equals(object value) { throw null; }
        public bool Equals(Index other) { throw null; }
        public override int GetHashCode() { throw null; }
        public override string ToString() { throw null; }
        public static implicit operator Index(int value) { throw null; }
    }
    public readonly partial struct Range : System.IEquatable<System.Range>
    {
        private readonly int _dummyPrimitive;
        public Index Start { get { throw null; } }
        public Index End { get { throw null; } }
        public override bool Equals(object value) { throw null; }
        public bool Equals(Range other) { throw null; }
        public override int GetHashCode() { throw null; }
        public override string ToString() { throw null; }
        public static Range Create(Index start, Index end) { throw null; }
        public static Range FromStart(Index start) { throw null; }
        public static Range ToEnd(Index end) { throw null; }
        public static Range All() { throw null; }
    }
}