
void main()
main: scope:[main]  from
  [0] main::a#0 = *SCREEN
  [1] main::a#1 = - main::a#0
  [2] *(SCREEN+1) = main::a#1
  [3] main::$1 = main::a#1 >> 2
  [4] *(SCREEN+2) = main::$1
  to:main::@return
main::@return: scope:[main]  from main
  [5] return 
  to:@return
