old_contents: """ XXX: fish """
  
  from pygame.color import Color
  from pygame.rect import Rect
  from pygame.surface import Surface
  from pygame.constants import *
  from pygame import (
      display, color, surface, time, event, constants, sprite,
      mouse, locals, image, transform, pkgdata, font, mixer,
      cursors, key, draw
  )
  from pygame.base import (
      init, quit, HAVE_NEWBUF, get_sdl_version, get_sdl_byteorder,
      register_quit
  )
  from pygame._error import get_error, set_error, SDLError
  
  # map our exceptions on pygame's default
  error = SDLError
  
new_contents: """ XXX: fish """
  
  from pygame.color import Color
  from pygame.rect import Rect
  from pygame.surface import Surface
  from pygame.constants import *
  from pygame import (
      display, color, surface, time, event, constants, sprite,
      mouse, locals, image, transform, pkgdata, font, mixer,
      cursors, key, draw
  )
  from pygame.base import (
      init, quit, HAVE_NEWBUF, get_sdl_version, get_sdl_byteorder,
      register_quit
  )
  from pygame._error import get_error, set_error, SDLError
  from pygame.mask import Mask
  
  # map our exceptions on pygame's default
  error = SDLError
  
subject: Add Mask to toplevel pygame namespace