We're referring to the original posts problem where using = inside a function can redefine global variables:

  arc> (= data* '(green red)) 

  arc> (def my-fn () (= data* nil))
  #<procedure: my-fn>
  arc> (my-fn)
  nil
  arc> data*
  nil

assume you place this in html.arc

  (= data* '(blue red))

  ; (add-color 'purple)
  (def add-color (color)
    (push color data*))
    

  (= data* '(green red))

  ; (add-apple 'golden)
  (def add-apple (color)
    (push color data*))

  (load "lib/apples.arc")
  (load "lib/html.arc")

  > (string (car data*) " has gone brown")

  "blue has gone brown"