We actually started by copying ruby's syntax and semantic, including the `do end while`. But a long time ago we started to diverge from it. We are also not sure

We actually started by copying ruby's syntax and semantic, including the `do end while`. But a long time ago we started to diverge from it. We are also not sure about this "feature" and we still have time to remove it from the language :-) . It's true that a simple `while ... break if ... end` is enough. Edit: I also misunderstood the comment. In Crystal `exp while cond` and `begin exp end while cond` are the same.