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<?php abstract class T { static $instanses; final private function __construct(){ } public static function getInstance() { if (!isset(static::$instanses)) { static::$instanses = new $this; } return static::$instanses; } } class A extends T { } $t = A::getInstance(); var_dump($t); ?>
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Using $this when not in object context in /in/MFJ3F:14 Stack trace: #0 /in/MFJ3F(25): T::getInstance() #1 {main} thrown in /in/MFJ3F on line 14
Process exited with code 255.

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