From: Jack Christensen <jack@...>
Date: 2010-09-01T09:09:50+09:00
Subject: Ruby constant lookup for classes in modules

  What's the difference between defining a class inside of a module and 
using the module as a prefix?

module Foo
   class Bar
   end
end

module Foo
   class Works
     def f
       Bar.new
     end
   end
end

class Foo::Fails
   def f
     Bar.new
   end
end

Foo::Works.new.f
Foo::Fails.new.f


The last line fails:

lookup.rb:16:in `f': uninitialized constant Foo::Fails::Bar (NameError)
     from lookup.rb:21

I would have thought that both ways of placing a class in a module would 
be equivalent.

Thanks.

Jack