I'd like this poll, because of the choices: a brand new language is often nice to experiment with, because the ideas, paradigms and concept it uses or introduces are food for thought in your daily production-grade language(s). If the only tool you have in a hammer..... ;-) But new languages oftentimes are updated with breaking changes, have bugs, security issues, poor IDE support... or even deprecated/forgotten quickly .. which don't make them great candidates for real production work.