mono/netcore/System.Private.CoreLib/shared/System/Collections/IStructuralComparable.cs

// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

namespace System.Collections
{
    public interface IStructuralComparable
    {
        int CompareTo(object? other, IComparer comparer);
    }
}