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            Query the current value of the allocator property.
          
constexpr Allocator query(
    execution::allocator_t< void > ) const;
            Do not call this function directly. It is intended for use with the
            query
            customisation point.
          
For example:
boost::asio::system_executor ex;
auto alloc = boost::asio::query(ex,
    boost::asio::execution::allocator);