I realized that the refactor to use ReactDebugCurrentFrame as a decoupled stack frame for error messages is not reentrant: https://github.com/facebook/react/pull/10105/files#r127573520

Fiber is not reentrant but other renderers might be. The synchronous server renderer is atm.

We should add tests for warnings between renderers, such as calling a server-render from within a client render, and update the set/reset callsites to use push/pop instead to account for that.

render() {
          return null;
        }
      }
      const response = ReactDOMServer.renderToString(<NullComponent />);
      expect(response).toBe('');
    });
    
    it('should render composite components', () => {
      class Parent extends React.Component {
        render() {
          return (
            <div>
              <Child name="child" />
            </div>
          );
        }
      }
      class Child extends React.Component {