gistfile1.txt

$ gem update --system
Updating rubygems-update
Successfully installed rubygems-update-1.7.0
Installing RubyGems 1.7.0
<internal:lib/rubygems/custom_require>:32:in `rescue in require': undefined method `try_activate' for Gem:Module (NoMethodError)
        from <internal:lib/rubygems/custom_require>:29:in `require'
        from d:/Ruby192/lib/ruby/gems/1.9.1/gems/rubygems-update-1.7.0/lib/rubygems.rb:31:in `<top (required)>'
        from <internal:lib/rubygems/custom_require>:29:in `require'
        from <internal:lib/rubygems/custom_require>:29:in `require'
        from setup.rb:24:in `<main>'

rubygems.rb

31: require "rubygems/deprecate" # this isn't in the manifest nor is it in the gem directory