$ quackery

Welcome to Quackery.

Enter "leave" to leave the shell.

/O> [ dup join swap join join ] is f ( [ [ [ --> [ )
...

Stack empty.

/O> $ 'Rosetta' $ 'Code' $ ':' f
...

Stack: [ 82 111 115 101 116 116 97 58 58 67 111 100 101 ]

/O> echo$
...
Rosetta::Code
Stack empty.

/O>