@begin: scope:[]  from
  [0] (byte) i ← (byte) 3
  to:@1
@1: scope:[]  from @begin
  [1] phi()
  [2] call main 
  to:@end
@end: scope:[]  from @1
  [3] phi()

(void()) main()
main: scope:[main]  from @1
  [4] phi()
  to:main::@1
main::@1: scope:[main]  from main main::@2
  [5] if((byte) i<(byte) 7) goto main::@2
  to:main::@return
main::@return: scope:[main]  from main::@1
  [6] return 
  to:@return
main::@2: scope:[main]  from main::@1
  [7] *((const byte*) SCREEN + (byte) i) ← (byte) i
  [8] (byte) i ← ++ (byte) i
  to:main::@1
