
void main()
main: scope:[main]  from
  [0] phi()
  to:main::sum1
main::sum1: scope:[main]  from main
  [1] phi()
  to:main::@1
main::@1: scope:[main]  from main::sum1
  [2] *screen = main::sum1_return#0
  to:main::sum2
main::sum2: scope:[main]  from main::@1
  [3] phi()
  to:main::@2
main::@2: scope:[main]  from main::sum2
  [4] *(screen+1) = main::sum2_return#0
  to:main::sum3
main::sum3: scope:[main]  from main::@2
  [5] phi()
  to:main::@3
main::@3: scope:[main]  from main::sum3
  [6] *(screen+2) = main::sum3_return#0
  to:main::@return
main::@return: scope:[main]  from main::@3
  [7] return 
  to:@return
