• Emacs Common Lisp is an implementation of Common Lisp, written in emacs Lisp. It does not yet purport to conform to the ANSI standard since, among other things, CLOS, and pretty printing are missing. However, most other Common Lisp features like lexical closures, packages, readtables, multiple values, bignums, adjustable arrays, etc, are present. At this stage many bugs remain and error checking is sparse.