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std::move in a return statement can prevent the NRVO: <https://developers.redhat.com/blog/2019/04/12/understanding-when-not-to-stdmove-in-c> PR106272 reports that we have two such cases in class label_text's member functions. We have -Wpessimizing-move that's supposed to detect problematic std::move uses, but in this case it didn't trigger. I've filed PR106276 to track that. PR preprocessor/106272 libcpp/ChangeLog: * include/line-map.h (class label_text): Don't std::move in a return statement.