nginx -T not display full in some case?

in ngx_http_lua_directive.c:1876，is need add dump?  like this:

```
            b->pos = b->start + len;
            b->last = b->pos + n;
            start = b->start;

+ #if (nginx_version >= 1009002)
+             if (dump) {
+                dump->last = ngx_cpymem(dump->last, b->start + len, size);
+             }
+ #endif

            continue;
```