Main function using a function that returns a pointer.

user_pointer_return_main.go

type User struct {
	Name  string
	Email string
}

func main() {
	var u *User
	u, err := fetchStruct()
	if err == nil {
		modifyEmail(u)
	}
}

func modifyEmail(u *User) {
	u.Email = "new Email"
}