Follow up from https://github.com/facebook/react/pull/11616.

Here's one I found. These two invariants:

https://github.com/facebook/react/blob/7e7127387ba64f57299eaff8656542cea6fb3a2d/packages/react-reconciler/src/ReactFiberClassComponent.js#L330-L343

are in a function that's behind a DEV block:

https://github.com/facebook/react/blob/7e7127387ba64f57299eaff8656542cea6fb3a2d/packages/react-reconciler/src/ReactFiberClassComponent.js#L447-L449

I don't think this is intentional, but need to verify.

There may be more. I'll use this issue to track while https://github.com/facebook/react/pull/11616 preserves existing behavior.
componentWillRecieveProps() {
    return false;
  }
  render() {
    return React.createElement('span', {className: 'foo'});
  }
}
class ReadContext extends React.Component {
  static contextTypes = { bar: PropTypes.string };
  render() {
    return React.createElement('div', { className: this.context.bar });
  }
}
class ProvideContext extends React.Component {
  static childContextTypes = { bar: PropTypes.string };
  getChildContext() {
    return { bar: 'bar-through-context' };
  }
  render() {
    return React.createElement(ReadContext);
  }
}
class ClassicRefs extends React.Component {