internal

type Causer interface {
	Cause() error
}

type Messager interface {
	Message() string
}

type MyStack struct {
	Sum     [16]byte
	Content []byte
}

type RetCoder interface {
	RetCode() int
}

type RetcodeMessager interface {
	RetCoder
	Messager
}

type Stacker interface {
	Stack() int
}