RSRP-287529: error CS0425: The constraints for type parameter 'T' of method 'Base.Foo(int)' must match the constraints for type parameter 'T' of interface method 'IFace.Foo(int)'. Consider using an explicit interface implementation instead.

interface IFace
{
    void Foo<T>(int x) where T : class;
}

class Base<S>
{
    public virtual void Foo<T>(int x) { }
    public virtual void Foo<T>(S x) where T : class { }
}

class Derived : Base<int>, IFace
{
}