def load name, context
      if @loader
        if partial = @loader.load(name)
          Partial::Context.new partial, context
        end
      else
        raise 'Cannot load partial without loader'
      end
    end
def load name, context
      if @loader
        if partial = @loader.load(name)
          Partial::Context.new partial, context
        end
      else
        raise 'Cannot load partial without loader'
      end
    end
Load partial