Function get_env

include/exec/libdispatch_queue.hpp:488–491

      }

      auto get_env() const noexcept -> STDEXEC::env_of_t<Receiver>
      {
        return STDEXEC::get_env(shared_state_.rcvr_);
      }

      shared_state      &shared_state_;
      libdispatch_queue &queue_;