Version 1.13.3 is available upstream. Please consider updating! It seems that version 1.13.3 is available upstream, while the latest version in the Gentoo tree is 1.13.2. You think this warning is false? Read more about it here.
Crystal is a programming language that resembles Ruby but compiles to
native code and tries to be much more efficient, at the cost of disallowing
certain dynamic aspects of Ruby.