# File lib/sprockets/processing.rb, line 154
    def unregister_postprocessor(mime_type, klass)
      expire_index!

      if klass.is_a?(String) || klass.is_a?(Symbol)
        klass = @postprocessors[mime_type].detect { |cls|
          cls.respond_to?(:name) &&
            cls.name == "Sprockets::Processor (#{klass})"
        }
      end

      @postprocessors[mime_type].delete(klass)
    end