Dereference a pointer to slice

I have the following code snippet:

package main

type test struct {
	arr *[]int
	val int

func main() {
	a := test{arr: &[]int{1, 2, 3, 4, 5}, val: 21}
	*(a.arr)[2] = 656

and I am getting the following error:

./4.go:13:10: invalid operation: a.arr[2] (type *[]int does not support indexing)

I am not able to understand, how to de-reference the slice pointer to modify the value.

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