package main

import "fmt"

type dog struct {
	name string
}

func (d dog) bark() {
	fmt.Printf("%s: Woof!\n", d.name)
}

func main() {
	rex := dog{name: "Rex"}
	lassie := dog{name: "Lassie"}

	rex.bark()    // Rex: Woof!
	lassie.bark() // Lassie: Woof!
}