@begin: scope:[]  from
  [0] phi()
  to:@1
@1: scope:[]  from @begin
  [1] phi()
  [2] call main 
  to:@end
@end: scope:[]  from @1
  [3] phi()

(void()) main()
main: scope:[main]  from @1
  [4] phi()
  to:main::@1
main::@1: scope:[main]  from main
  [5] *((const byte*) screen+(byte) $27) ← (byte) 0
  [6] *((const byte*) screen+(byte) $25) ← (byte) 0
  to:main::@1_1
main::@1_1: scope:[main]  from main::@1
  [7] *((const byte*) screen+(byte) $28*(byte) 1+(byte) $27) ← (byte) 0
  [8] *((const byte*) screen+(byte) $28*(byte) 1+(byte) $25) ← (byte) 0
  to:main::@return
main::@return: scope:[main]  from main::@1_1
  [9] return 
  to:@return
