# File lib/rubygems/source_info_cache.rb, line 255
  def reset_cache_for(url, cache_data)
    say "Reseting cache for #{url}" if Gem.configuration.really_verbose

    sice = Gem::SourceInfoCacheEntry.new Gem::SourceIndex.new, 0
    sice.refresh url, false # HACK may be unnecessary, see ::cache and #refresh

    cache_data[url] = sice
    cache_data
  end