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The top Democrat on the House Intelligence Committee, Rep. Jim Himes of Connecticut, said this week that “we’re pretty good at taking missiles down. What is much more problematic for us is the huge inventory of Iranian drones, which are hard to detect and hard to take down.”，更多细节参见zoom
Both mechanisms — LockSet and levels — use MutexKey. You can think of the key as a kind of scope: it’s consumed by each lock() call and re-emitted at the new level. It’s branded with an invariant lifetime (same technique as std::thread::scope) so it can’t escape the closure, and it’s !Send so it stays on the thread that created it.