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Brad King authored
Visual Studio 2015 Update 3 introduced the notion of language standard levels to MSVC. The language standard level is defined in `_MSVC_LANG` instead of `__cplusplus`. It also added support for the `-std:c++14` and `-std:c++latest` flags, although the compiler defaults to its C++14 mode anyway. Visual Studio 2017 Update 3 will introduce support for the `-std:c++17` flag. Fixes: #16482
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