For implementers, the locking model adds a fair amount of non-trivial internal bookkeeping. Every operation must check lock state, readers must be tracked, and the interplay between locks, cancellation, and error states creates a matrix of edge cases that must all be handled correctly.
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彼时，在一些地区，还存在贫困人口底数不清、扶贫对象不明、扶贫资金“天女散花”等问题，以致“年年扶贫年年贫”。
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// result.value is a NEW view, possibly over different memory