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module TestDuckTyping
{
    methods 
    {
        DoWhatDucksDo(d : IDuck)
        {
            Console.WriteLine(d.Quack());
        }
        
        Main()
        {
            var m = new Man();
            var d = new Duck();
            DoWhatDucksDo(d);
            DoWhatDucksDo(m);
        }
    }
}

interface IDuck
{
    methods
    {
        Quack() : String;
    }
}

class Man
{
    methods
    {
        Quack() : String
        {
            return "quack " + Shoot();
        }
        Shoot() : String
        {
            return "bang";
        }
    }
}

class Duck
{
    implements
    {
        IDuck;
    }
    methods
    {
        Quack() : String
        {
            return "quack";
        }
    }
}