interface I1
{
    abstract void M(int x);
}

class Base<T>
{
    public void M(T x){}
    public void M(int x){}
}

class Derived : Base<int>, I1  // warning CS1956: Member 'Base<int>.M(int)' implements interface member 
                               // 'I1.M(int)' in type 'Derived'. There are multiple matches for the 
                               // interface member at run-time. It is implementation dependent
                               // which method will be called.
{
}

interface I1
{
    abstract static void M(int x);
}

class Base<T>
{
    public static void M(T x){}
    public static void M(int x){}
}

class Derived : Base<int>, I1
{
}