_ works in assignments, function arguments, and match arms. The loop creates a new
Notice how we never remove deleted keys from the map. This is one drawback to CRDTs — we can only ever add information, not remove it. Although from the application’s perspective the key has been fully deleted, the underlying state still records that the key was once there. In technical terms, we say that CRDTs are monotonically increasing data structures.9
，详情可参考夫子
他同时强调，卡塔尔将行使自卫权，防范并应对任何针对卡塔尔的军事侵略行为。（央视新闻）
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