*feature*

>Warning: A component is `contentEditable` and contains `children` managed by React. It is now your responsibility to guarantee that none of those nodes are unexpectedly modified or duplicated. This is probably not intentional.

It would help heaps if I would know _which_ component is causing this.
'\n    in tr (at **)' +
          '\n    in Row (at **)' +
          '\n    in table (at **)' +
          '\n    in Foo (at **)',
      );
      expectDev(normalizeCodeLocInfo(console.error.calls.argsFor(1)[0])).toBe(
        'Warning: validateDOMNesting(...): Text nodes cannot appear as a ' +
          'child of <tr>.' +
          '\n    in tr (at **)' +
          '\n    in Row (at **)' +
          '\n    in table (at **)' +
          '\n    in Foo (at **)',
      );
      expectDev(normalizeCodeLocInfo(console.error.calls.argsFor(2)[0])).toBe(
        'Warning: validateDOMNesting(...): Whitespace text nodes cannot ' +
          "appear as a child of <table>. Make sure you don't have any extra " +
          'whitespace between tags on each line of your source code.' +
          '\n    in table (at **)' +
          '\n    in Foo (at **)',
      );
    });
    it('gives useful context in warnings', () => {
      spyOn(console, 'error');
      function Row() {
        return <tr />;
      }
      function FancyRow() {
        return <Row />;
      }
      class Table extends React.Component {