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.
return <span className={this.state.bar} />;
      }
    }
    test(<Foo initialValue="foo" />, 'SPAN', 'foo');
  });
  it('renders based on state using props in the constructor', () => {
    class Foo extends React.Component {
      constructor(props) {
        super(props);
        this.state = {bar: props.initialValue};
      }
      changeState() {
        this.setState({bar: 'bar'});
      }
      render() {
        if (this.state.bar === 'foo') {
          return <div className="foo" />;
        }
        return <span className={this.state.bar} />;
      }
    }
    var instance = test(<Foo initialValue="foo" />, 'DIV', 'foo');
    instance.changeState();
    test(<Foo />, 'SPAN', 'bar');
  });
  it('renders based on context in the constructor', () => {
    class Foo extends React.Component {