
void main()
main: scope:[main]  from
  [0] main::ub = $ff
  [1] *main::sb_ptr = 1
  [2] *main::ub_screen = main::ub
  [3] main::sb = $7f
  [4] *main::ub_ptr = 1
  [5] *main::sb_screen = main::sb
  to:main::@return
main::@return: scope:[main]  from main
  [6] return 
  to:@return
