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run code in 150+ php & hhvm versions
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<?hh //strict error_reporting(-1); function f(int $x) { echo $x; } f();
based on 87eF3
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.4.0 - 5.4.32
<?hh //strict error_reporting(-1); function f(int $x) { echo $x; } f();