TCION

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

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