Function index_target_fail

extlibs/sol3/include/sol/sol.hpp:21130–21132

	}

	inline int index_target_fail(lua_State* L, void*) {
		return index_fail(L);
	}

	inline int new_index_fail(lua_State* L) {
		return luaL_error(L, "sol: cannot set (new_index) into this object: no defined new_index operation on usertype");