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`[[nodiscard]]` should be applied to functions where discarding the return value is most likely a correctness issue. - https://libcxx.llvm.org/CodingGuidelines.html#apply-nodiscard-where-relevant The following utilities have been annotated in this patch: - [x] `<barrier>` - [x] `<condition_variable>` - [x] `<latch>` - [x] `<mutex>` - [x] `<semaphore>` - [x] `<thread>` N.B. Some classes don't provide all specified methods, which were not annotated.