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run code in 500+ PHP versions simultaneously
<?php class Foo { public function run(): void { } } class Bar extends Foo { /** * @return never */ public function run() { exit; } } new Bar();
Output for 8.3.5, 8.4.12
Fatal error: Declaration of Bar::run() must be compatible with Foo::run(): void in /in/ODTRm on line 13
Process exited with code 255.

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