Dynamic typing in Golang

type.go

package main

import (
	"fmt"
)

type I interface {
	Test()
}

type A struct{}

func (A) Test() {}

type B struct{}

func (B) Test() {}

func main() {
	var i I
	i = A{}
	fmt.Println("Type:  %T\n", i)
	i = B{}
	fmt.Println("Type : %T\n", i)
}