https://codesandbox.io/s/elastic-mayer-rzz4h2?file=/package.json

This is supposed to `console.error` but it doesn't.

17 warns: https://codesandbox.io/s/admiring-minsky-sze07m?file=/src/App.js
if (rootWithPendingPassiveEffects === null) {
    return false;
  }
  const root = rootWithPendingPassiveEffects;
  const lanes = pendingPassiveEffectsLanes;
  rootWithPendingPassiveEffects = null;
   TODO: This is sometimes out of sync with rootWithPendingPassiveEffects.
   Figure out why and fix it. It's not causing any known issues (probably
   because it's only used for profiling), but it's a refactor hazard.
  pendingPassiveEffectsLanes = NoLanes;
  if ((executionContext & (RenderContext | CommitContext)) !== NoContext) {
    throw new Error('Cannot flush passive effects while already rendering.');
  }
  if (__DEV__) {
    if (enableDebugTracing) {
      logPassiveEffectsStarted(lanes);
    }
  }