new

# File lib/rubygems/resolver/index_set.rb, line 7
  def initialize source = nil # :nodoc:
    super()

    @f =
      if source then
        sources = Gem::SourceList.from [source]

        Gem::SpecFetcher.new sources
      else
        Gem::SpecFetcher.fetcher
      end

    @all = Hash.new { |h,k| h[k] = [] }

    list, = @f.available_specs :released

    list.each do |uri, specs|
      specs.each do |n|
        @all[n.name] << [uri, n]
      end
    end

    @specs = {}
  end