docs: function(fragment) {
      if ("production" !== process.env.NODE_ENV) {
        if (canWarnForReactFragment) {
          if (!fragment[fragmentKey]) {
            ("production" !== process.env.NODE_ENV ? warning(
              didWarnForFragment(fragment),
              'Any use of a keyed object should be wrapped in ' +
              'React.addons.createFragment(object) before being passed as a ' +
              'child.'
            ) : null);
            return fragment;
          }
          return fragment[fragmentKey];
        }
      }
      return fragment;
    }