Michel Demazure <lists / ruby-forum.com> wrote:
> ruby 1.9.3-p429
> 
> This happens on Windows, I do not know for other platforms. It seems
> ruby can load files twice, by capitalizing file names.
> 
> For instance :
> 
> irb(main):001:0> require 'set'
> => true # loaded
> irb(main):002:0> require 'set'
> => false # already loaded
> irb(main):003:0> require 'Set'
> C:/Ruby193/lib/ruby/1.9.1/Set.rb:451: warning: already initialized

Looks like you're using a case-insensitive filesystem :<