# File lib/locale/driver/env.rb, line 39
      def locale
        # At least one environment valiables should be set on *nix system.
        [ENV["LC_ALL"], ENV["LC_CTYPES"], ENV["LANG"]].each do |loc|
          if loc != nil and loc.size > 0
            return Locale::Tag::Posix.parse(loc)
          end
        end
        nil
      end