When setting the pointer to nil, struct pointer field doesn't change

I have this code:

type X struct {
    y *X
}

func main() {
    x1 := &X{y: nil}
    x2 := &X{y: x1}

    fmt.Println(x1 == x2.y)
    // true

    x1 = nil

    fmt.Println(x1 == nil)
    fmt.Println(x2.y == nil)

    // true
    // false
}

As you can see x.y is a *X.
Why after setting x1 to nil. The value of x2.y doesn’t become nil?
Sorry if my question is so silly.

Here is the link of the code in Go playground.

>Solution :

x1 is a pointer pointing to an {y:nil} of type X.
x2.y is also a pointer pointing to the same {y:nil}. So when you set x1=nil, x1 becomes a pointer that is nil, and x2.y is still pointing to the same {y:nil} object.