This is SBCL 1.4.2.nixos, an implementation of ANSI Common Lisp.
More information about SBCL is available at <http://www.sbcl.org/>.

SBCL is free software, provided as is, with absolutely no warranty.
It is mostly in the public domain; some portions are provided under
BSD-style licenses.  See the CREDITS and COPYING files in the
distribution for more information.
WARNING:
   Deprecated recursive use of (ASDF/OPERATE:OPERATE 'ASDF/LISP-ACTION:LOAD-OP
   '("quicklisp")) while visiting
   (ASDF/LISP-ACTION:LOAD-OP "load-quicklisp" "load-quicklisp") - please use
   proper dependencies instead
*