Hi, Today, I talked with NaHi about enhancing const_missing to enable autoload-like feature with nested modules. But autoload itself has fundamental flaw under multi-thread environment. I should have remove autoload when I added threads to the language (threads came a few months after autoload). So I hereby declare the future deprecation of autoload. Ruby will keep autoload for a while, since 2.0 should keep compatibility to 1.9. But you don't expect it will survive further future, e.g. 3.0. I strongly discourage the use of autoload in any standard libraries. matz.