Fatal error: Uncaught TypeError: Return value of foo() must be an instance of void, none returned in /in/PVqNg:5
Stack trace:
#0 /in/PVqNg(7): foo()
#1 {main}
thrown in /in/PVqNg on line 5
Process exited with code 255.
Output for 5.6.0 - 5.6.40
Parse error: syntax error, unexpected ':', expecting '{' in /in/PVqNg on line 3
Process exited with code 255.