Thank ElixirConf for giving me another chance to make a presentation at ElixirConf US 2019: This presentation will be conducted by me and Mr. Hisae, who is a graduate student in my laboratory and a co-author of Hastega. He's a great meta-programmer because he wrote a new feature of Hastega only one night! Look forward to an announcement on it at ElixirConf US 2019! BTW, development of Hastega has