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<?php interface A { public function b() : mixed; } final class X implements A { public function b() : object { return new stdClass(); } } final class Y implements A { public function b() : void { } }
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Declaration of Y::b(): void must be compatible with A::b(): mixed in /in/Gfd9i on line 18
Process exited with code 255.

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