package main

import "fmt"

type vehicle struct {
	name string
}

func (v vehicle) describe() {
	fmt.Printf("%s is a vehicle.\n", v.name)
}

type car struct {
	vehicle
}

func (c car) describe() {
	c.vehicle.describe()
	fmt.Println("  It has four wheels.")
}

func main() {
	beetle := car{vehicle: vehicle{name: "Beetle"}}
	beetle.describe()
}