Find the panic!

panic.go

package main

import "fmt"

type BM struct {
	d string
}
func NewBM() *BM { return &BM{d: "Hi",}}

type CM struct {}
func NewCM() *CM { return &CM{}}

type A struct {
	bM *BM
	cM *CM
}

func NewA() (*A, error) {
	a := &A{}
	
	bM, err := a.BM()
	if err != nil {
		return nil, err
	}
	a.bM = bM
	
	cM, err := a.CM()
	if err != nil {
		return nil, err
	}
	a.cM = cM
	return a, nil
}

func (this *A) BM() (*BM, error) {
	if this.BM != nil {
		fmt.Printf("Returning this.bM")
		return this.bM, nil
	}
	return NewBM(), nil
}

func (this *A) CM() (*CM, error) {
	if this.cM != nil {
		fmt.Printf("Returning this.cM")
		return this.cM, nil
	}
	
	bM, err := this.BM()
	if err != nil {
		return nil, err
	}
	fmt.Printf("%s", bM.d)
	return NewCM(), nil
}


func main() {
	_, err := NewA()
	if err != nil {
		fmt.Printf("%s", error.Error)
	}
	
}