1 extern void ref (); 2 extern void foo (); 3 4 void _start()5 _start () 6 { 7 foo (); 8 ref (); 9 } 10 11 void __start()12 __start () 13 { 14 _start (); 15 } 16 17 void start()18 start () 19 { 20 __start (); 21 } 22