This is a literate program describing Bourbaki's formal language as they laid it out in the English translation Theory of Sets.
It's probably not wise to use it as a foundations for mathematics, or as the engine for a proof assistant, because...well, it's horribly bloated as a foundations. Famously, the number 1 requires something like 273,385 symbols (if the ordered pair is a primitive --- otherwise, it requires about 20 times as many symbols).
Assuming you have cabal installed locally, be sure to have cabal install lhs2tex:
~/bourbaki/$ cabal install lhs2tex
Then you can run make code to extract the Haskell code, make to
have pdflatex compile the literate commentary.