老师您好，关于结构体方法的问题

package main

import "fmt"

type treeNode struct {
   value       int
   left, right *treeNode
}

func (node treeNode) print() {
fmt.Println(node.value)
}

func setValue(value int, node treeNode) {
   node.value = value
}

func createNode(value int) *treeNode {
return &treeNode{value: value}
}
func main() {
var root treeNode

   root = treeNode{value: 3}
   root.left = &treeNode{}
   root.right = &treeNode{5, nil, nil}
   root.right.left = new(treeNode)
   root.left.right = createNode(2)

   root.print()

setValue(4, root.right.left)
fmt.Println(root.right.left.value)
}

上面这样setValue会报错：cannot use root.right.left (type *treeNode) as type treeNode in argument to setValue

package main

import "fmt"

type treeNode struct {
   value       int
   left, right *treeNode
}

func (node treeNode) print() {
fmt.Println(node.value)
}

func (node treeNode) setValue(value int) {
node.value = value
}

func createNode(value int) *treeNode {
return &treeNode{value: value}
}
func main() {
var root treeNode

   root = treeNode{value: 3}
   root.left = &treeNode{}
   root.right = &treeNode{5, nil, nil}
   root.right.left = new(treeNode)
   root.left.right = createNode(2)

   root.print()

 root.right.left.setValue(4)
fmt.Println(root.right.left.value)
}

这样却不报错，不是说这两种定义方法都是一样的吗