
void main()
main: scope:[main]  from
  [0] phi()
  to:main::@1
main::@1: scope:[main]  from main main::@1
  [1] main::x#2 = phi( main/0, main::@1/main::x#1 )
  [2] main::y#0 = main::x#2 + $c
  [3] main::screen[main::y#0] = 'a'
  [4] main::cols[main::y#0] = main::BLACK
  [5] main::x#1 = ++ main::x#2
  [6] if(main::x#1!=$b) goto main::@1
  to:main::@return
main::@return: scope:[main]  from main::@1
  [7] return 
  to:@return
