Comment by raddan

It's cute so I had to look it up. According to this guy [1], it's a poem from Graham Hutton's Haskell book [2]. I don't have the book so I can't check, but it sounds plausible.

[1] https://myotherpants.com/tag/test-first/

[2] https://www.amazon.com/Programming-Haskell-Graham-Hutton/dp/...