This is SBCL 2.1.9, 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.
;;; loading #P"/usr/local/lib/sbcl/asdf/asdf.lisp"
* (let ((x '(WRITEC LDC #\e WRITEC LDC #\l WRITEC LDC #\l WRITEC LDC #\o WRITEC LDC #\  WRITEC STOP))) (equal x (read-from-string (write-to-string x))))
NIL