Is this a bug in the PL/SQL compiler

I had some leisure time and sifted through some of my old stackoverflow questions and answers. On December 22nd, 2010, I asked the question Is this a bug in the PL/SQL compiler. It turned out, that the following PL/SQL compiles (at least on Oracle 11):

create or replace package return as subtype return is varchar2(10); end return; / create or replace package tq84 as constant constant return . return := 'return'; function function return return . return; end tq84; /

I still find this quite funny, so I had to post it on this blog!