Fatal error: Uncaught Error: Access to undeclared static property A::$y in /in/RYnWq:10
Stack trace:
#0 {main}
thrown in /in/RYnWq on line 10
Process exited with code 255.
Fatal error: Uncaught Error: Access to undeclared static property: A::$y in /in/RYnWq:10
Stack trace:
#0 {main}
thrown in /in/RYnWq on line 10
Process exited with code 255.