validate_non_files

# File lib/rubygems/specification_policy.rb, line 246
  def validate_non_files
    return unless packaging
    non_files = files.reject {|x| File.file?(x) || File.symlink?(x)}

    unless non_files.empty?
      error "[\"#{non_files.join "\", \""}\"] are not files"
    end
  end