mkock

type student interface {
	register(context.Context, string, string, int)
	enrollCourse(uint32, time.Time) error
	pass(uint32) error
	fail(uint32) error
}

type alsoStudent interface {
	register(ctx context.Context, name, profession string, age int)
	enrollCourse(courseID uint32, start time.Time) error

mkock

public interface Vehicle {
        public void start();
        public void stop();
}

public class Car implements Vehicle {
        public void start() {
                System.out.println("starting engine...");
        }
        public void stop() {

mkock

type Vehicle interface {
	Start()
	Stop()
}

type Car struct {}

func (c *Car) Start() {
	fmt.Println("starting engine...")
}

mkock

type toaster interface {
	toast()
}

type acmeToaster struct {}

func (a *acmeToaster) toast() { fmt.Println("Commencing toasting of bread...") }

func doToast(t toaster) {
	t.toast()

mkock

// Verify that acmeToaster satisfies interface toaster.
var _ toaster = &acmeToaster{}

mkock

type empty interface {}

mkock

type monster struct {
	damage int
}

func (m *monster) attack() int {
	return m.damage
}

type attacker interface {
	attack() int

mkock

type toaster interface {
	toast()
}

type acmeToaster struct {}

func (a *acmeToaster) toast() { fmt.Println("Commencing toasting of bread...") }

mkock

func doToast(t toaster) {
	t.toast()
}

mkock

type myError struct{}

func (m *myError) Error() string {
	return "failure"
}

func doSomething() (string, *myError) {
	return "", nil
}