Go - How do you change the value of a pointer parameter?

In Golang, is it possible to change a pointer parameter's value to something else?

For example,

func main() {
	i := 1
	test(&i)
}
func test(ptr interface{}) {
	v := reflect.ValueOf(ptr)
	
	fmt.Println(v.CanSet()) // false
	v.SetInt(2) // panic
}

https://play.golang.org/p/3OwGYrb-W-

Is it possible to have test() change i to point to another value 2?

Not sure if this is what you were looking for,
but yes you can change a pointer's value to something else.
The code below will print 2 and 3:

package main
import (
	"fmt"
)
func main() {
	i := 1
	testAsAny(&i)
	fmt.Println(i)
	testAsInt(&i)
	fmt.Println(i)
}
func testAsAny(ptr interface{}) {
	*ptr.(*int) = 2
}
func testAsInt(i *int) {
	*i = 3
}

Here's now to set the value using the reflect package. The key point is to set the pointer's element, not the pointer itself.

func test(ptr interface{}) {
  v := reflect.ValueOf(ptr).Elem()
  v.SetInt(2)
}

playground example

Note that the reflect package is not needed for this specific example as shown in another answer.