# [Brain-Flak Classic], 18 bytes

    ([()]){[(({}){})]}

[Try it online!][TIO-liajo2k7]

    # Push (and print) a 1
    ([()])
    
    # While True...
    {
        # Print...
        [
            # Double the value on top of stack
            (({}){})
        ]
    }

[Brain-Flak Classic]: https://codegolf.stackexchange.com/questions/79625/write-a-brain-flak-classic-interpreter
[TIO-liajo2k7]: https://tio.run/##SypKzMzTTctJzP7/XyNaQzNWszpaQ6O6VhOIYmv///@vm5iTnJNYXJyZDAA "Brain-Flak – Try It Online"