Method copy_assign_ref

include/sol/reference.hpp:269–275

		}

		lua_State* copy_assign_ref(lua_State* L_, lua_State* rL, const stateless_reference& r) {
			if (valid(L_)) {
				deref(L_);
			}
			ref = r.copy_ref(L_);
			return rL;
		}

		lua_State* move_assign(lua_State* L_, lua_State* rL, stateless_reference&& r) {
			if (valid(L_)) {