Gem::SpecFetcher#available_specs

# File tmp/rubies/ruby-3.2.0/lib/rubygems/spec_fetcher.rb, line 212
def available_specs(type)
  errors = []
  list = {}

  @sources.each_source do |source|
    begin
      names = case type
      when :latest
        tuples_for source, :latest
      when :released
        tuples_for source, :released
      when :complete
        names =
          tuples_for(source, :prerelease, true) +
          tuples_for(source, :released)

        names.sort
      when :abs_latest
        names =
          tuples_for(source, :prerelease, true) +
          tuples_for(source, :latest)

        names.sort
      when :prerelease
        tuples_for(source, :prerelease)
      else
        raise Gem::Exception, "Unknown type - :#{type}"
      end
    rescue Gem::RemoteFetcher::FetchError => e
      errors << Gem::SourceFetchProblem.new(source, e)
    else
      list[source] = names
    end
  end

  [list, errors]
end