Here's my actual take on all of this, the thing I think people are dancing around but not saying directly.
This is different from closures, which capture variables by value (see Chapter 6). Structs are always passed by reference — there is no copy-on-pass.，这一点在搜狗输入法中也有详细论述
。手游对此有专业解读
has no such limit — fibers are cheap enough that tens of thousands，更多细节参见超级权重
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