<?hh declare(strict_types=1); class A {} class B extends A {} class C extends B {} class D {} interface InterfaceTest { public function foo(): B; } abstract class AbstractTest { public abstract function foo(): B; } class TestAbstractContravariance extends AbstractTest { public function foo(): D {} } class TestAbstractCovariance extends AbstractTest { public function foo(): D {} } class TestInterfaceContravariance implements InterfaceTest { public function foo(): D {} } class TestInterfaceCovariance implements InterfaceTest { public function foo(): D {} }
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