void main()
main: scope:[main]  from
  [0] phi()
  to:main::@1
main::@1: scope:[main]  from main main::@2
  [1] main::i#2 = phi( main/0, main::@2/main::i#1 )
  [1] main::s#2 = phi( main/MESSAGE, main::@2/main::s#1 )
  [2] main::c#1 = *main::s#2
  [3] main::s#1 = ++ main::s#2
  [4] if(0!=main::c#1) goto main::@2
  to:main::@return
main::@return: scope:[main]  from main::@1
  [5] return 
  to:@return
main::@2: scope:[main]  from main::@1
  [6] SCREEN[main::i#2] = main::c#1
  [7] main::i#1 = ++ main::i#2
  to:main::@1