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<?php interface Foo { public function render(bool $x = null); } class X implements Foo { public function render(bool $x = false) { var_dump($x); } } (new X())->render();
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Declaration of X::render(bool $x = false) must be compatible with Foo::render(?bool $x = null) in /in/KuM1M on line 10
Process exited with code 255.

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