class ActionView::PartialRenderer

def render_partial
  view, locals, block = @view, @locals, @block
  object, as = @object, @variable
  if !block && (layout = @options[:layout])
    layout = find_template(layout.to_s, @template_keys)
  end
  object ||= locals[as]
  locals[as] = object
  content = @template.render(view, locals) do |*name|
    view._layout_for(*name, &block)
  end
  content = layout.render(view, locals){ content } if layout
  content
end