mono/netcore/System.Private.CoreLib/shared/System/IEquatable.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.

using System.Diagnostics.CodeAnalysis;

namespace System
{
    public interface IEquatable<T> // invariant due to questionable semantics around equality and inheritance
    {
        bool Equals([AllowNull] T other);
    }
}