// NUL character is not allowed
	{'\x01', "\x01"},
	{' ' - 1, string(' ' - 1)},
	{'+', "+"},
	{'/', "/"},
	{'.', "."},
	{'~', "~"},
	{'(', "("},
}

func makeSource(pattern string) *bytes.Buffer {
	var buf bytes.Buffer
	for _, k := range tokenList {
		fmt.Fprintf(&buf, pattern, k.text)
	}
	return &buf
}