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<?php interface OrderInterface { public function getCheckoutCompletedAt(): \DateTime; } class Order implements OrderInterface { public function getCheckoutCompletedAt() { } }
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Declaration of Order::getCheckoutCompletedAt() must be compatible with OrderInterface::getCheckoutCompletedAt(): DateTime in /in/ia8c1 on line 10
Process exited with code 255.

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