anchor.diff:  (import urn/logger logger)
   (import urn/traceback traceback)
   
  -(defun run-with-profiler (fn mappings)
  +(defun profile-calls (fn mappings)
  +  :hidden
     (let* [(stats (empty-struct))
            (call-stack '())]
   
  
positive.code: 
      stats))
  
  (defun run-lua (compiler args)
    (when (nil? (.> args :input))
      (logger/put-error! (.> compiler :log) "No inputs to run.")
      (exit! 1))
  
negative.code: 
      (fn)
  
      (debug/sethook)
  
      (with (out (values stats))
        (table/sort out (lambda (a b) (> (.> a :innerTime) (.> b :innerTime))))
  