luaX_token2str
return luaX_token2str(ls, token);
LUAI_FUNC const char *luaX_token2str (LexState *ls, int token);
luaX_token2str(ls, what), luaX_token2str(ls, who), where));
luaO_pushfstring(ls->L, "%s expected", luaX_token2str(ls, token)));