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            Query the current value of the context property.
          
static system_context & query(
    execution::context_t );
            Do not call this function directly. It is intended for use with the
            query
            customisation point.
          
For example:
boost::asio::system_executor ex;
boost::asio::system_context& pool = boost::asio::query(
    ex, boost::asio::execution::context);