go_workshop/chapter_06/activity_6.01/main.go

package main

import (
  "errors"
  "fmt"
)

var (
  ErrInvalidLastName      = errors.New("invalid last name")
  ErrInvalidRoutingNumber = errors.New("invalid routing number")
)

func main() {

  fmt.Println(ErrInvalidLastName)
  fmt.Println(ErrInvalidRoutingNumber)

}