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<?php class A implements Serializable { public function serialize() { return 'foo'; } public function unserialize() { } } var_dump(serialize(new A()));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Declaration of A::unserialize() must be compatible with Serializable::unserialize(string $data) in /in/06FlB on line 8
Process exited with code 255.

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