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nested namespace definition is a C++17 extension; define each namespace separately [-Wc++17-extensions]

nested namespace definition is a C++17 extension; define each namespace separately [-Wc++17-extensions]

nested namespace definition is a C++17 extension; define each namespace separately [-Wc++17-extensions]

nested namespace definition is a C++17 extension; define each namespace separately [-Wc++17-extensions]

nested namespace definition is a C++17 extension; define each namespace separately [-Wc++17-extensions]

nested namespace definition is a C++17 extension; define each namespace separately [-Wc++17-extensions]

nested namespace definition is a C++17 extension; define each namespace separately [-Wc++17-extensions]

nested namespace definition is a C++17 extension; define each namespace separately [-Wc++17-extensions]

nested namespace definition is a C++17 extension; define each namespace separately [-Wc++17-extensions]