code: function getStackAddendumByWorkInProgressFiber$1(workInProgress) {
    var info = '';
    var node = workInProgress;
    do {
      info += describeFiber(node);
      // Otherwise this return pointer might point to the wrong tree:
      node = node['return'];
    } while (node);
    return info;
  }
docs: This function can only be called with a work-in-progress fiber and only during begin or complete phase. Do not call it under any other circumstances.