
void main()
main: scope:[main]  from
  [0] phi()
  to:main::toUpper1
main::toUpper1: scope:[main]  from main
  [1] phi()
  to:main::@1
main::@1: scope:[main]  from main::toUpper1
  [2] *screen = main::toUpper1_return#0
  to:main::toUpper2
main::toUpper2: scope:[main]  from main::@1
  [3] phi()
  to:main::@2
main::@2: scope:[main]  from main::toUpper2
  [4] *(screen+1) = main::toUpper2_ch#0
  to:main::@return
main::@return: scope:[main]  from main::@2
  [5] return 
  to:@return
