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.
render() {
          return <div>{this.context.text}</div>;
        }
      }
      ClassChildWithContext.contextTypes = {text: PropTypes.string};
      const e = await render(
        <PurpleContext>
          <ClassChildWithContext />
        </PurpleContext>,
      );
      expect(e.textContent).toBe('purple');
    });
    itRenders('stateless child with context', async render => {
      function StatelessChildWithContext(props, context) {
        return <div>{context.text}</div>;
      }
      StatelessChildWithContext.contextTypes = {text: PropTypes.string};
      const e = await render(
        <PurpleContext>
          <StatelessChildWithContext />
        </PurpleContext>,
      );
      expect(e.textContent).toBe('purple');
    });
    itRenders('class child without context', async render => {
      class ClassChildWithoutContext extends React.Component {