import (
"fmt"
"slices"
)
var first = []int{2, 3, 5}
var second = []int{7, 11, 13}
var all1 = append(first, second...)
//all1 is { 2, 3, 5, 7, 11, 13 }
var all2 = slices.Concat(first, second)
//all2 is { 2, 3, 5, 7, 11, 13 }
fmt.Println("all1 is", all1)
fmt.Println("all2 is", all2)