qdqwdqw

package main

import "fmt"

type A interface {
    A()
}
type B interface {
    A
    B()
}

type AA struct {}
type BB struct {}

func (aa *AA) A() {
    fmt.Println("AA method A()")
}


func (bb *BB) A() {
    fmt.Println("BB method A()")
}


func (bb *BB) B() {
    fmt.Println("BB method B()")
}

func Factory(c *A) (d *A) {
    return d, nil
}

func main() {
    aa := &AA{}
    aa.A()
   fmt.Printf("hello, world\n")
}