
void main()
main: scope:[main]  from
  [0] phi()
  to:main::@1
main::@1: scope:[main]  from main main::@2
  [1] main::b#2 = phi( main/0, main::@2/main::b#1 )
  [2] if(str[main::b#2]!=0) goto main::@2
  to:main::@3
main::@3: scope:[main]  from main::@1
  [3] main::$0 = '0' + main::b#2
  [4] *SCREEN = main::$0
  to:main::@return
main::@return: scope:[main]  from main::@3
  [5] return 
  to:@return
main::@2: scope:[main]  from main::@1
  [6] main::b#1 = ++ main::b#2
  to:main::@1
