net9.0
namespace System.Linq
{
    public static class Enumerable
    {
        public static IEnumerable<(int Index, TSource Item)>! Index<TSource>(this IEnumerable<TSource>! source);
    }
}
Assembly System.Linq , Version=9.0.0.0, PublicKeyToken=b03f5f7f11d50a3a
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.NET 9.09.0-android9.0-ios9.0-maccatalyst9.0-macos9.0-tvos9.0-windows
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04/26/2024
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