# File lib/sass/tree/visitors/cssize.rb, line 41
  def with_parent(parent)
    @parent_directives.push parent if parent.is_a?(Sass::Tree::DirectiveNode)
    old_parent, @parent = @parent, parent
    yield
  ensure
    @parent_directives.pop if parent.is_a?(Sass::Tree::DirectiveNode)
    @parent = old_parent
  end