Fatal error: Uncaught ArgumentCountError: Too few arguments to function f(), 0 passed in /in/Ptf0u on line 11 and exactly 1 expected in /in/Ptf0u:5
Stack trace:
#0 /in/Ptf0u(11): f()
#1 {main}
thrown in /in/Ptf0u on line 5
Process exited with code 255.
Warning: Missing argument 1 for f(), called in /in/Ptf0u on line 11 and defined in /in/Ptf0u on line 5
Notice: Undefined variable: x in /in/Ptf0u on line 6