Just from glancing over the docs, that doesn't seem supported:
> Dada, like JavaScript, is based exclusively on async-await. This means that operations that perform I/O, like print, don't execute immediately. Instead, they return a thunk, which is basically "code waiting to run" (but not running yet). The thunk doesn't execute until you await it by using the .await operation.
Good riddance, IMO — never been a fan of blocking IO. Dada does have threads though, so I wonder how that works out. (Forcing async/await makes a lot more sense in JavaScript because it's single-threaded.)