Function markSpawnedRetryLane

packages/react-reconciler/src/ReactFiberWorkLoop.js:3247–3255

(lane: Lane)

}

export function markSpawnedRetryLane(lane: Lane): void {
  // Keep track of the retry lanes that were spawned by a fallback during the
  // current render and were not later pinged. This will represent the lanes
  // that are known to still be suspended.
  workInProgressSuspendedRetryLanes = mergeLanes(
    workInProgressSuspendedRetryLanes,
    lane,
  );
}

function panicOnRootError(root: FiberRoot, error: mixed) {
  // There's no ancestor that can handle this exception. This should never