gemspec_cached_path

# File lib/bundler/fetcher.rb, line 270
    def gemspec_cached_path(spec_file_name)
      paths = Bundler.rubygems.spec_cache_dirs.map {|dir| File.join(dir, spec_file_name) }
      paths = paths.select {|path| File.file? path }
      paths.first
    end