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<?php class Canary extends stdClass { public function __construct(public string $name) { } function __destruct() { echo $this->name."\n"; } } $canary = new Canary('canary'); $map = new \WeakMap(); $map[$canary] = 'foo'; echo 1; unset($canary); echo 2;
Output for git.master, git.master_jit, rfc.property-hooks
1canary 2

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