#!/usr/bin/env /friends/bin/goscript

package main

import "fmt"

type Dog struct {}
func (*Dog) Say() {
    fmt.Println("bow wow")
}

type Cat struct {}
func (*Cat) Say() {
    fmt.Println("mew mew")
}

type Animal interface {
    Say()
}

type Human struct {
    animal Animal
}

func (h *Human) touch() {
    h.animal.Say()
}

func main() {
    h1 := &Human { &Dog {} }
    h2 := &Human { &Cat {} }

    h1.touch()
    h2.touch()
}