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        Determine if T can be converted
        to value.
      
        Defined in header <boost/json/value_from.hpp>
      
template< class T> using has_value_from = see-below;
        If T can be converted to
        value
        via a call to value_from, the static data member
        value is defined as true. Otherwise, value
        is defined as false.
      
        Convenience header <boost/json.hpp>