@begin: scope:[]  from
  [0] phi()
  to:@1
@1: scope:[]  from @begin
  [1] phi()
  [2] call main 
  to:@end
@end: scope:[]  from @1
  [3] phi()
main: scope:[main]  from @1
  [4] phi()
  to:main::@2
main::@2: scope:[main]  from main main::@1
  [5] (byte) main::i#7 ← phi( main::@1/(byte) main::i#1 main/(byte) 0 )
  to:main::@3
main::@3: scope:[main]  from main::@1 main::@2
  [6] (byte) main::i#6 ← phi( main::@2/(byte) main::i#7 main::@1/(byte) main::i#1 )
  [6] (byte~) main::$3 ← phi( main::@2/(byte) 'a' main::@1/(byte) 'b' )
  [7] *((const byte*) main::SCREEN#0 + (byte) main::i#6) ← (byte~) main::$3
  [8] (byte) main::i#1 ← ++ (byte) main::i#6
  [9] if((byte) main::i#1!=(byte) $a) goto main::@1
  to:main::@return
main::@return: scope:[main]  from main::@3
  [10] return 
  to:@return
main::@1: scope:[main]  from main::@3
  [11] if((byte) main::i#1<(byte) 5) goto main::@2
  to:main::@3
