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<?php interface Feature { public static function fromInput(array $featureInput) : self; } final class Covariance implements Feature { public static function fromInput(array $featureInput) : Feature { return new self(); } } $covariantReturnType = Covariance::fromInput([]); var_dump($covariantReturnType);
Output for git.master, git.master_jit, rfc.property-hooks
object(Covariance)#1 (0) { }

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