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run code in 300+ PHP versions simultaneously
<?php abstract class Tracker { abstract public function track(); } class MailTracker extends Tracker { public function track(array $actions, array $params); }
Output for 5.3.0 - 5.3.27, 5.4.0 - 5.4.19
Fatal error: Non-abstract method MailTracker::track() must contain body in /in/oOSBU on line 8
Process exited with code 255.

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