anchor.diff:    ;; boundp
     ll-symbolp
     ll-symbol-value ll-symbol-name
  -  ;atoms-family
  +  ;; atoms-family
     )
  
positive.code: ;; =========
  
  ;; ### set
  ;; (**set** _sym_ _v_) -> [ll-anyp]
  ;; - _sym_ : [integerp]
  ;; - _v_ : [ll-anyp]
  ;;
  ;; TODO
  ;;
  ;; AutoLISP built-in.
  
  ;; ### boundp
  ;; (**boundp** _sym_) -> [ll-booleanp]
  ;; - _sym_ : [ll-symbolp]
  ;;
  ;; Returns `t` if _sym_ has a value bound to it, `nil` otherwise.
  ;;
  
negative.code:       (car names)))
  
  ;; ### atoms-family
  ;; (**atoms-family** [ll-integerp]: _form_ [[listp]: _syms_]) -> [listp]
  ;;
  ;; Returns a list of the currently defined symbols.
  ;;
  