
void main()
main: scope:[main]  from
  [0] phi()
  [1] call f
  to:main::@1
main::@1: scope:[main]  from main
  [2] *main::SCREEN = f::return#0
  to:main::@return
main::@return: scope:[main]  from main::@1
  [3] return 
  to:@return

char f()
f: scope:[f]  from main
  [4] phi()
  to:f::@return
f::@return: scope:[f]  from f
  [5] return 
  to:@return
