anchor.diff:       :mostly-written-in ("C++"))
   
       (:name "Allegro Common Lisp"
  +     :nickname "AllegroCL"
        :license "Proprietary"
        :homepage "http://www.franz.com/products/allegrocl/"
        :documentation "http://www.franz.com/support/documentation/"
  
positive.code:      :mostly-written-in ("C++"))
      ;; xcl is experimental. Lacking a lot of features. Rather slow, at least at startup.
      
      (:name "WCL"
       :license "Proprietary"
       :homepage "http://www.commonlisp.net/"
       :documentation  "http://www.commonlisp.net/"
  
negative.code:                 "readline")
       :mostly-written-in ("C"))
  
      (:name "Carnegie Mellon University Common Lisp"
       :nickname "CMUCL"
       :license       "public domain + BSD"
       :homepage      "http://www.cons.org/cmucl/"
       :documentation "http://common-lisp.net/project/cmucl/doc/cmu-user/"
  