Method set_stopped

include/exec/start_now.hpp:110–113

      constexpr void set_error(_Error&&) noexcept = delete;

      constexpr void set_stopped() noexcept
      {
        __stg_->__complete();
      }

      // Forward all receiever queries.
      constexpr auto get_env() const noexcept -> decltype(auto)