anchor.diff:    "Return the list X without the first element present. In the case that
      X is nil, the empty list is returned. Due to the way lists are represented
      internally, this function runs in linear time.
  -   
  +
      Example:
      ```
      > (cdr '(1 2 3))
  
positive.code:    proportion to the size of the input list. This is generally a bad thing."
  
  (import base (defun defmacro when let* set-idx!
                get-idx cons for gensym -or
                pretty print error tostring  -and
                unpack debug if # + - >= = ! with))
  (import base)
  
negative.code: (defun car (x)
    "Return the first element present in the list X. This function operates
     in constant time.
  
     Example:
     ```
     > (car '(1 2 3))
  