We don't actually use this anywhere, so let's remove it.

https://github.com/facebook/react/blob/f1d00156df5453bc62bd5668fefdcac4ca67e90e/src/renderers/shared/fiber/ReactFiberScheduler.js#L1504-L1512
(fiber.alternate !== null && capturedErrors.has(fiber.alternate)))
    );
  }
  function isFailedBoundary(fiber: Fiber): boolean {
     
     
    return (
      failedBoundaries !== null &&
      (failedBoundaries.has(fiber) ||
        (fiber.alternate !== null && failedBoundaries.has(fiber.alternate)))
    );
  }
  function commitErrorHandling(effectfulFiber: Fiber) {
    let capturedError;
    if (capturedErrors !== null) {
      capturedError = capturedErrors.get(effectfulFiber);
      capturedErrors.delete(effectfulFiber);
      if (capturedError == null) {
        if (effectfulFiber.alternate !== null) {
          effectfulFiber = effectfulFiber.alternate;
          capturedError = capturedErrors.get(effectfulFiber);
          capturedErrors.delete(effectfulFiber);
        }
      }
    }
    invariant(
      capturedError != null,
      'No error for given unit of work. This error is likely caused by a ' +
        'bug in React. Please file an issue.',
    );