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<?php #[Attribute] class x {} class y extends x {} $ref = new \ReflectionFunction(#[x, y] function () { }); try { $ref->getAttributes()[0]->newInstance(); $ref->getAttributes()[1]->newInstance(); } catch (\Error $e) { var_dump('Error : ', $e->getMessage()); } ?>
Output for rfc.property-hooks, git.master_jit, git.master
string(8) "Error : " string(54) "Attempting to use non-attribute class "y" as attribute"

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