We missed this because Flow wasn't being run properly on Travis but now that it is, it's clear that #7716 introduced a bunch of new Flow failures. Most of these shouldn't be too bad and I like to say "you break it you buy it" so this one is for you @Aweary :)

There were a couple other pre-existing Flow issues that @vjeux is going to fix, so mostly this should just be the TestRenderer issues.

/**
 * Copyright 2013-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *
 * @providesModule ReactMultiChild
 */
'use strict';
var ReactComponentEnvironment = require('ReactComponentEnvironment');
var ReactInstanceMap = require('ReactInstanceMap');
var ReactInstrumentation = require('ReactInstrumentation');
var ReactCurrentOwner = require('ReactCurrentOwner');
var ReactReconciler = require('ReactReconciler');
var ReactChildReconciler = require('ReactChildReconciler');
var emptyFunction = require('emptyFunction');
var flattenChildren = require('flattenChildren');
var invariant = require('invariant');
/**
 * Make an update for markup to be rendered and inserted at a supplied index.
 *
 * @param {string} markup Markup that renders into an element.
 * @param {number} toIndex Destination index.
 * @private
 */
function makeInsertMarkup(markup, afterNode, toIndex) {