
void __start()
__start: scope:[__start]  from
  [0] phi()
  to:__start::__init1
__start::__init1: scope:[__start]  from __start
  [1] idx = 0
  to:__start::@1
__start::@1: scope:[__start]  from __start::__init1
  [2] phi()
  [3] call main 
  to:__start::@return
__start::@return: scope:[__start]  from __start::@1
  [4] return 
  to:@return

__stackcall void fn1()
fn1: scope:[fn1]  from main main::@1
  [5] idx = ++ idx
  to:fn1::@return
fn1::@return: scope:[fn1]  from fn1
  [6] return 
  to:@return

void main()
main: scope:[main]  from __start::@1
  [7] phi()
  [8] callexecute fn1 
  to:main::@1
main::@1: scope:[main]  from main
  [9] SCREEN[idx] = 'a'
  [10] callexecute fn1 
  to:main::@2
main::@2: scope:[main]  from main::@1
  [11] SCREEN[idx] = 'a'
  to:main::@return
main::@return: scope:[main]  from main::@2
  [12] return 
  to:@return
