code: function lazyResult (render, tree) {
    return {
      get html () {
        return render(tree, tree.options)
      },
      tree: tree,
      messages: tree.messages
    }
  }
docs: Wraps the PostHTMLTree within an object using a getter to render HTML on demand.
  
  @private
  
  @param   {Function} render
  @param   {Array}    tree
  @returns {Object<{html: String, tree: Array}>}