Careful when comparing value with nil in Golang

func main() {

   err := Foo()

   fmt.Println(err == nil)
}
func Foo() error {
   var err *os.PathError =nil
   return err
}

/tmp/___go_build_main_go #gosetup false Process finished with exit code 0

Best practice

func main() {
   err := Foo()
   fmt.Println(err == nil)
}
func Foo() error {
   var err *os.PathError =nil
   if err!= nil {
      return errors.New("Not nil")
   }
   return nil
}

/tmp/___go_build_main_go #gosetup
true

Process finished with exit code 0