Similarly, the code labelled “Block 3” will run when the tree is not empty, and when this frame’s child invocation is not yet complete. In this case we pass the accumulator and the tree’s contents into fn and then call the fold forest function with the new accumulator. This “call” is done by creating a stack frame for the child invocation and transferring control to it, using frame = frame.child. Again, logically, this matches the second case of the recursive implementation.
Марина Совина (ночной редактор)，这一点在新收录的资料中也有详细论述
，更多细节参见新收录的资料
Unwrap success or propagate failure
这种“基站夜间兼职”的模式，触及了一个更深层的变革：基站正在从单纯的“成本中心”向可能的“利润中心”演进。当然，这还只是试验。客户画像还不清晰——是卖给互联网公司做边缘推理？还是给工业企业做机器视觉？商业模式还在探索中。但它至少打开了一个想象空间：如果全城的基站都能在夜间贡献算力，那将是一张多么庞大的分布式计算网络。。新收录的资料对此有专业解读
"It's too far away and train prices are expensive. But with somewhere this local, it's really accessible and I think that's important with the music industry at the moment."