sql DO in rule 9.0rc1

["A.M." <agentm@xxxxxxxxxxxxxxxxxxxxx>]

Is there a technical limitation which prevents DO from being used in rules or am I missing something with this?

CREATE RULE test_update AS ON UPDATE TO test DO INSTEAD DO $$                                                                           
                 BEGIN;                                                                                                                                         
                 RAISE NOTICE 'hello';                                                                                                                          
                 END;                                                                                                                                           
               $$;  

Cheers,
M
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