Нашёл вчера вечером Urbit, щас прохожу - доставляет.
!: :: To write a trivial Hoon program
|= * ::
|= [a=@ ~] :: For educational purposes only
:_ ~ :_ ~ ::
:- %$ :: Preserve this mysterious boilerplate square
!> ::
::::::::::::::::: Produce a value below
=+ b=0
|- ?: =(a +(b))
b
$(b +(b))
