<p><b>@benpicco</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/10951#discussion_r323466422">sys/shell/commands/sc_gnrc_ipv6_nib.c</a>:</p>
<pre style='color:#555'>> +    }
+    else if ((argc > 3) && (strcmp(argv[2], "add") == 0)) {
+        gnrc_netif_t *netif;
+        ipv6_addr_t addr = IPV6_ADDR_UNSPECIFIED;
+
+        if (ipv6_addr_from_str(&addr, argv[3]) == NULL) {
+            _usage_nib_abr(argv);
+            return 1;
+        }
+        /* check addr */
+        if (ipv6_addr_is_link_local(&addr)) {
+            printf("address %s must be global\n", argv[3]);
+            return 1;
+        }
+        if (((netif = gnrc_netif_get_by_ipv6_addr(&addr)) == NULL) ||
+            gnrc_netif_is_6lbr(netif)) {
</pre>
<p>I think you just like double negations ;-)</p>

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