anchor.diff:    "Modify the function definition BODY so that all executions
      are automatically timed. The time report is printed to standard
      output.
  -   
  +
      Note that documentation strings and other attributes are
      not preserved, and that the definition must be of the form
  -   
  +
      ```
      (defun foo (bar) ...)
      ``` "
  
positive.code:   "Modify the function definition BODY so that all executions are
     benchmarked. That is, the function is run repeatededly TIMES times,
     and the average running time is reported on standard output.
    
     Note that documentation strings and other attributes are
     not preserved, and that the definition must be of the form
     
     ```
     (defun foo (bar) ...)
     ``` "
  
negative.code:              (,name ,@args))
             (print! (.. (pretty (list ',name ,@args))
                         " took, on average, "
                         (/ (- (os/clock) ,time-sym) ,times)
                         " seconds per iteration ("
                         (- (os/clock) ,time-sym)
                         " for " ,times " iterations).")))))))
  