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