Extend FMT_FALLTHROUGH compatibily to gcc and clang pre-C++17 (#1469)
Extend FMT_FALLTHROUGH compatibily to gcc and clang pre-C++17 (#1469)


alabuzhev/fmt,alabuzhev/fmt,cppformat/cppformat,cppformat/cppformat,cppformat/cppformat,alabuzhev/fmt