class Program
{
    static void Main()
    {
    }
}

class A
{
    public void Foo(object x, object y)
    {
        if(x == y)
        {
            
        }
    }
}

Put the caret onto 'Main' identifer. Then ctrl+click == operator in A.Foo. Tooltip 'The target has no declarations' is displayed near 'Main'.