Error "X does not implement Y (method has a pointer receiver)" in Go

Hello! I started learning Go and encountered a strange error when working with interfaces. I have a simple `Speaker` interface with a `Speak()` method, and a `Dog` struct that implements this method. But when I try to pass a `Dog` value to a function expecting `Speaker`, the compiler gives an error: ``` cannot use dog (variable of type Dog) as Speaker value in argument to makeSpeak: Dog does not implement Speaker (method Speak has a pointer receiver) ``` Here is my code: ```go package main import "fmt" type Speaker interface { Speak() string } type Dog struct { Name string } func (d *Dog) Speak() string { return "Woof! I am " + d.Name } func makeSpeak(s Speaker) { fmt.Println(s.Speak()) } func main() { dog := Dog{Name: "Bobik"} makeSpeak(dog) } ```