example_of_recommended.go

func ThisIsRecommendedButBroken() error {
	f, err := os.Open("this_file.txt")
	if err != nil {
		return err
	}

	// Make sure to close this later...
	defer func() { err = f.Close() }()

	// do some stuff
	return nil
}

func ThisIsRecommendedAndWorks() (err error) {
	f, err := os.Open("this_file.txt")
	if err != nil {
		return err
	}

	// Make sure to close this later...
	defer func() { err = f.Close() }()

	// do some stuff
	return nil
}