// true
}

func ExampleIndex() {
	numbers := []int{0, 42, 8}
	fmt.Println(slices.Index(numbers, 8))
	fmt.Println(slices.Index(numbers, 7))
	// Output:
	// 2
	// -1
}

func ExampleIndexFunc() {
	numbers := []int{0, 42, -10, 8}
	i := slices.IndexFunc(numbers, func(n int) bool {
		return n < 0
	})
	fmt.Println("First negative at index", i)
	// Output:
	// First negative at index 2
}