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run code in 300+ PHP versions simultaneously
<?php class Foo extends Closure {}
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.27, 7.4.0 - 7.4.16, 8.0.0 - 8.0.3
Fatal error: Class Foo may not inherit from final class (Closure) in /in/B8HJW on line 3
Process exited with code 255.

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