* Don't show "context" for classes without either contextType or contextTypes
* For classes with contextTypes, change the label to "legacy context" instead

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Originally reported by @gaearon via https://github.com/bvaughn/react-devtools-experimental/issues/368
}
      if (state === MOUNTING) {
        return null;
      }
      return fiber;
    }
     I
     t
     s
    let a: Fiber = fiber;
    let b: Fiber = alternate;
    while (true) {
      let parentA = a.return;
      if (parentA === null) {
         W
        break;
      }
      let parentB = parentA.alternate;
      if (parentB === null) {
         T
         h
         i
         o
        const nextParent = parentA.return;
        if (nextParent !== null) {
          a = b = nextParent;
          continue;
        }
         If there's no parent, w
        break;