size := utf8.EncodeRune(buf, c)
		fmt.Printf("%d: %d %[2]s %d\n", i, buf, size)
	}
	// Output:
	// 0: [239 191 189] � 3
	// 1: [239 191 189] � 3
	// 2: [239 191 189] � 3
}

func ExampleFullRune() {
	buf := []byte{228, 184, 150} // 世
	fmt.Println(utf8.FullRune(buf))
	fmt.Println(utf8.FullRune(buf[:2]))
	// Output:
	// true
	// false
}

func ExampleFullRuneInString() {
	str := "世"