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            Obtain an executor with the relationship.fork property.
          
basic_system_executor< Blocking, execution::relationship_t::fork_t, Allocator > require(
    execution::relationship_t::fork_t ) const;
            Do not call this function directly. It is intended for use with the
            require
            customisation point.
          
For example:
boost::asio::system_executor ex1;
auto ex2 = boost::asio::require(ex1,
    boost::asio::execution::relationship.fork);