There is a proof of concept that attempts to allow Crystal extensions for Ruby: https://github.com/manastech/crystal_ruby https://github.com/manastech/crystal_r

There is a proof of concept that attempts to allow Crystal extensions for Ruby: https://github.com/manastech/crystal_ruby https://github.com/manastech/crystal_ruby That said, it's just a proof of concept. It'll probably be a while before it becomes robust enough for regular users.