# File lib/bundler/source/rubygems.rb, line 76
      def specs
        @specs ||= begin
          # remote_specs usually generates a way larger Index than the other
          # sources, and large_idx.use small_idx is way faster than
          # small_idx.use large_idx.
          idx = @allow_remote ? remote_specs.dup : Index.new
          idx.use(cached_specs, :override_dupes) if @allow_cached || @allow_remote
          idx.use(installed_specs, :override_dupes)
          idx
        end
      end