using System;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
{
    MyStruct<object, object> s1 = default;
    MyStruct<object, object> s2 = default;
    Console.WriteLine(Equals(s1, s2));
}

{
    MyStruct<object, string> s1 = default;
    MyStruct<object, string> s2 = default;
    Console.WriteLine(Equals(s1, s2));
}

[MethodImpl(MethodImplOptions.NoInlining)]
static bool Equals<T>(T x, T y)
{
    return EqualityComparer<T>.Default.Equals(x, y);
}

struct MyStruct<T, U> : IEquatable<MyStruct<U, U>>
{
    public bool Equals(MyStruct<U, U> other)
    {
        Console.WriteLine("Here");
        return false;
    }
}