message: Do not use `boost/detail` header in `Show.cpp`
  Summary:
  Pull Request resolved:
  As title. Breaks with `boost` `1.74`.
diff: #include <iomanip>
  +#include <boost/version.hpp>
  +// Quoted was accepted into public components as of 1.73. The `detail`
  +// header was removed in 1.74.
  +#if BOOST_VERSION < 107400
  #include <boost/io/detail/quoted_manip.hpp>
  +#else
  +#include <boost/io/quoted.hpp>
  +#endif
  #include "ControlFlow.h"
  #include "Creators.h"
  