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            Obtain an executor with the blocking.possibly property.
          
constexpr basic_executor_type< Allocator, unspecified > require(
    execution::blocking_t::possibly_t ) const;
            Do not call this function directly. It is intended for use with the
            require
            customisation point.
          
For example:
auto ex1 = my_thread_pool.executor();
auto ex2 = boost::asio::require(ex1,
    boost::asio::execution::blocking.possibly);