old_contents: """
      The top level of the APL Read-Evaluate-Print loop
  
      UNDER DEVELOPMENT
  
      This version adds trivial apl_quit() and apl_exit() routines to the read-evaluate-print loop.
  """
  
  import sys
  
  def     read_evaluate_print (prompt):
      """
      Read input, echo input
      """
      try:
          while True:
              print(end=prompt)
              line = input().lstrip()
              if line:
                  if line[0] == ')':
                      if line[0:4].upper() == ')OFF':
                          apl_exit("Bye bye")
              print('⎕', line)
      except EOFError:
          apl_exit(None)
  
  def     apl_quit ():
      """
      Quit without clean up
      """
      print ()
      sys.exit(0)
  
  def     apl_exit (message):
      """
      Clean up and quit
      """
      if message is None:
          print ()
      else:
          print (message)
      sys.exit(0)
  
  # EOF
  
new_contents: """
      The top level of the APL Read-Evaluate-Print loop
  
      UNDER DEVELOPMENT
  
      This version adds a dummy evaluate routine.
  """
  
  import sys
  
  # ------------------------------
  
  def     evaluate(expression):
      """
      Evaluate an APL expression - dummy version
      """
      return (expression)
  
  def     read_evaluate_print (prompt):
      """
      Read input, echo input
      """
      try:
          while True:
              print(end=prompt)
              line = input().lstrip()
              if line:
                  if line[0] == ')':
                      if line[0:4].upper() == ')OFF':
                          apl_exit("Bye bye")
              print('⎕', evaluate(line))
      except EOFError:
          apl_exit(None)
  
  def     apl_quit ():
      """
      Quit without clean up
      """
      print ()
      sys.exit(0)
  
  def     apl_exit (message):
      """
      Clean up and quit
      """
      if message is None:
          print ()
      else:
          print (message)
      sys.exit(0)
  
  # EOF
  
subject: Add dummy evaluate routine