I can confirm it's attempting to be a tiny CL subset. It has function namespace, symbols, simple numerics macros and backquote.

But error detection is non-existent: (ASSOC) crashed it, since it didn't check for arguments even.

It's at best, a Lisp reader, not interpreter, even if it does a few things right:

  (mapcar (lambda (x) (+ x x)) (list 1 2 3)) ==> (2 4 6) :-)

[Edit:

No need for speculation, here is the actual article describing this; submitter should have linked it, instead of just the repl

http://www.solve-et-coagula.com/?p=8

]