[ruby-core:35340] odd require behavior

Hello all.
In trunk "Queue" appears to be a native class.
In 1.9.2, its require causes an odd result:


>> Queue
NameError: uninitialized constant Object::Queue
        from (irb):1
        from D:/Ruby192/bin/irb:12:in `<main>'
>> require 'queue'
LoadError: no such file to load -- queue
        from <internal:lib/rubygems/custom_require>:29:in `require'
        from <internal:lib/rubygems/custom_require>:29:in `require'
        from (irb):2
        from D:/Ruby192/bin/irb:12:in `<main>'
>> Queue # it appears it was actually successful...
=> Queue
>> RUBY_DESCRIPTION
=> "ruby 1.9.2p136 (2010-12-25) [i386-mingw32]"

Any hints out there?
-r