**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.
'context',
      name,
      ReactDebugCurrentFiber.getCurrentFiberStackAddendum,
    );
    ReactDebugCurrentFiber.resetCurrentFiber();
  }
  // Cache unmasked context so we can avoid recreating masked context unless necessary.
  // Context is created before the class component is instantiated so check for instance.
  if (instance) {
    cacheContext(workInProgress, unmaskedContext, context);
  }
  return context;
};
exports.hasContextChanged = function(): boolean {
  return didPerformWorkStackCursor.current;
};
function isContextConsumer(fiber: Fiber): boolean {
  return fiber.tag === ClassComponent && fiber.type.contextTypes != null;
}
exports.isContextConsumer = isContextConsumer;
function isContextProvider(fiber: Fiber): boolean {
  return fiber.tag === ClassComponent && fiber.type.childContextTypes != null;
}
exports.isContextProvider = isContextProvider;
function popContextProvider(fiber: Fiber): void {
  if (!isContextProvider(fiber)) {
    return;
  }
  pop(didPerformWorkStackCursor, fiber);
  pop(contextStackCursor, fiber);