**Do you want to request a *feature* or report a *bug*?**
Bug

**What is the current behavior?**
Page load throws console error: `Warning: Stateless function components cannot be given refs. Attempts to access this ref will fail.null`

```
// Chrome console
6VM598:27 Warning: Stateless function components cannot be given refs. Attempts to access this ref will fail.null
window.console.error @ VM598:27
printWarning @ warning.js:36
warning @ warning.js:60
mountIndeterminateComponent @ react-dom.development.js:10488
beginWork @ react-dom.development.js:10647
performUnitOfWork @ react-dom.development.js:12621
workLoop @ react-dom.development.js:12730
callCallback @ react-dom.development.js:1319
invokeGuardedCallbackDev @ react-dom.development.js:1358
invokeGuardedCallback @ react-dom.development.js:1215
performWork @ react-dom.development.js:12848
batchedUpdates @ react-dom.development.js:13292
performFiberBatchedUpdates @ react-dom.development.js:1666
stackBatchedUpdates @ react-dom.development.js:1657
batchedUpdates @ react-dom.development.js:1671
batchedUpdatesWithControlledComponents @ react-dom.development.js:1684
dispatchEvent @ react-dom.development.js:1894
```

**What is the expected behavior?**
No console error. Or at least some way to trace which is the stateless component that is causing the issue.

**Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?**
`"react": "^16.0.0-rc.3",`
`Chrome Version 60.0.3112.113 (Official Build) (64-bit)`
`macOS Sierra 10.12.6`


- This error only started to appear after upgrading from React 15 -> 16.
'setState(...): Cannot call setState() inside getChildContext()',
        );
        break;
      case 'render':
        warning(
          false,
          'Cannot update during an existing state transition (such as within ' +
            "`render` or another component's constructor). Render methods should " +
            'be a pure function of props and state; constructor side-effects are ' +
            'an anti-pattern, but can be moved to `componentWillMount`.',
        );
        break;
    }
  };
}
var timeHeuristicForUnitOfWork = 1;
module.exports = function<T, P, I, TI, PI, C, CX, PL>(
  config: HostConfig<T, P, I, TI, PI, C, CX, PL>,
) {
  const hostContext = ReactFiberHostContext(config);
  const hydrationContext: HydrationContext<C, CX> = ReactFiberHydrationContext(
    config,
  );
  const {popHostContainer, popHostContext, resetHostContainer} = hostContext;
  const {beginWork, beginFailedWork} = ReactFiberBeginWork(
    config,
    hostContext,
    hydrationContext,
    scheduleUpdate,
    getPriorityContext,