[go-nuts] The behavior of the function variable which points to the struct method

[E Z]

I feel confused when I use the function pointer which point to the struct 
method. Here is the test code:

/***
package main

type Zoo struct {
    Animal string
}

func (z Zoo) Display(){
    fmt.Printf("Current animal is:%s\n", z.Animal)
}

func main(){
    gz := &Zoo{
        Animal: "Monkey",
    }

    pf := gz.Display
    pf()                                       //display "Current animal is 
Monkey"
    gz.Animal="Tiger"
    pf()                                        //display "Current animal 
is Monkey"
    gz.Display()                         //display "Current animal is Tiger"
}
***/
As the code is shown above,  even though I changed the value of the member 
field of the Zoo instance gz,  the function pointer call that followed 
still prints the unmodified value.

Can someone help explain why? In my opinion, The function pointer pf should 
bind to the instance gz and its method(note that gz here is a pointer 
variable),  if so anytime I change the value of the variable gz,  pf should 
reflect the changes.  

Thanks,
Ethan

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