
void main()
main: scope:[main]  from
  [0] phi()
  [1] call first
  [2] first::return#0 = first::return#2
  to:main::@1
main::@1: scope:[main]  from main
  [3] main::$0 = first::return#0
  [4] *main::SCREEN = *main::$0
  [5] call first
  [6] first::return#1 = first::return#2
  to:main::@2
main::@2: scope:[main]  from main::@1
  [7] main::$2 = first::return#1
  [8] *(main::SCREEN+1) = *main::$2
  to:main::@return
main::@return: scope:[main]  from main::@2
  [9] return 
  to:@return

char * first(char *msg)
first: scope:[first]  from main main::@1
  [10] first::return#2 = phi( main/msg1, main::@1/msg2 )
  to:first::@return
first::@return: scope:[first]  from first
  [11] return 
  to:@return
