class Bundler::Source::Rubygems

def cached_specs
  @cached_specs ||= begin
    idx = installed_specs.dup
    path = Bundler.app_cache
    Dir["#{path}/*.gem"].each do |gemfile|
      next if gemfile =~ /^bundler\-[\d\.]+?\.gem/
      s ||= Bundler.rubygems.spec_from_gem(gemfile)
      s.source = self
      idx << s
    end
  end
  idx
end