Reslice with length bound

package main

import "fmt"

func main() {
	s1 := []int{1,2,3,4,5}
	s2 := s1[0:1]
	s2 = append(s2, -1)
	fmt.Println(s1)
	fmt.Println(s2)
	
	s3 := []int{1,2,3,4,5}
	s4 := s3[0:1:1]
	s4 = append(s4, -1)
	fmt.Println(s3)
	fmt.Println(s4)

}