Go 每日一题

今日（2023-04-07）的题目如下

下面这段代码输出什么？为什么？

type People interface {
	Speak(string) string
}

type Student struct{}

func (stu *Student) Speak(think string) (talk string) {
	if think == "speak" {
		talk = "speak"
	} else {
		talk = "hi"
	}
	return
}

func main() {
	var peo People = Student{}
	think := "speak"
	fmt.Println(peo.Speak(think))
}

• A. speak
• B. compilation error