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<?php class Foo { public function dump(self $baz) { var_dump($baz); } } class Bar extends Foo { public function dump(self $baz) { parent::dump($baz); } } (new Foo)->dump(new Bar); (new Bar)->dump(new Bar); (new Bar)->dump(new Foo);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Declaration of Bar::dump(Bar $baz) must be compatible with Foo::dump(Foo $baz) in /in/Mdk7X on line 13
Process exited with code 255.

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