>>423
無理やりだけどこんな感じで

package main

import (
"fmt"
)

func _max(list []int) (int, int) {
if len(list) == 0 {
return 0, -1
}
max := list[0]
pos := 0
for i := 0; i < len(list); i++ {
if max < list[i] {
max = list[i]
pos = i
}
}
return max, pos
}

func main() {
arr_1 := []int{1, 10, 3, 4, 5, 6, 7, 8}
arr_2 := []int{100}

arr_2 = append(arr_2, (func(arg ...int) int { return arg[0] }(_max(arr_1))))

fmt.Printf("%v\n", arr_2)
}