CS5

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
  1. auto CS5;
  2. auto CS5;
  3. auto CS5;
  4. auto CS5;
    version(!darwin && !linux && !FreeBSD && solaris)
    extern (C) const
    auto CS5 = 0;

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