if (n == 0 || !JS_ISIDENT_START(c))
if (!JS_ISIDENT_START(c))
js_IsIdentifier(JSString *str){    size_t n;    jschar *s, c;    n = JSSTRING_LENGTH(str);    s = JSSTRING_CHARS(str);    c = *s;    /*     * We don't handle unicode escape sequences here     * because they won't be in the input string.     * (Right?)     */    if (n == 0 || !JS_ISIDENT_START(c))        return JS_FALSE;    for (n--; n != 0; n--) {        c = *++s;        if (!JS_ISIDENT(c))            return JS_FALSE;    }    return JS_TRUE;}