No deep copy

copy_demo.go

package main

import "fmt"

type S1 struct {
	SS []int
	N  int
}

func main() {
	a1 := []int{1, 2}
	b1 := []int{3, 4}
	copy(b1, a1)
	a1[1] = 20
	fmt.Printf("%v, %v\n", b1, a1)

	a2 := []S1{S1{[]int{1, 2, 3}, 1}, S1{[]int{4, 5, 6}, 2}}
	b2 := make([]S1, 2)
	copy(b2, a2)
	a2[0].SS[1] = 20
	fmt.Printf("%v, %v\n", b2, a2)

	a3 := [2]int{1, 2}
	ch1 := make(chan [2]int, 1)
	ch1 <- a3
	b3 := <-ch1
	a3[1] = 20
	fmt.Printf("%v, %v\n", b3, a3)

	a4 := []int{1, 2}
	ch2 := make(chan []int, 1)
	ch2 <- a4
	b4 := <-ch2
	a4[1] = 20
	fmt.Printf("%v, %v\n", b4, a4)

}