code: function(xmlElement) {
      // Note: Until January 2013 this block did not have mutations,
      // so 'statement' defaults to false and 'at' defaults to true.
      var isStatement = (xmlElement.getAttribute('statement') == 'true');
      this.updateStatement_(isStatement);
      var isAt = (xmlElement.getAttribute('at') != 'false');
      this.updateAt_(isAt);
    }
docs: Parse XML to restore the 'AT' input.
  @param {!Element} xmlElement XML storage element.
  @this Blockly.Block