PL/pgSQL Block Structure

DO $$
<<Block_Structure>>
DECLARE
    GojekRelease    INTEGER := 2010;
    GrabRelease INTEGER := 2012;
    UberRelease INTEGER := 2012;
BEGIN
    RAISE NOTICE 'Gojek Release on %', GojekRelease;
    RAISE NOTICE 'Grab Release on %', GrabRelease;
    RAISE NOTICE 'Uber Release on %', UberRelease;
END Block_Structure $$;