These are problems reported by the upstream parser wikiparser-node.
Examples of incorrect code for this rule:
中文http://example.com
{{T|arg=something}
{简体}-
[[a]
[[a|b]]]
[http://example.com [tag]text]
[ http://example.com example]
<a>
{{{a}}}
<gallery width=200></gallery>
<br style=filter:none>
<i></i id=x>
{| id=x | class=y
|}
{| style="" style=""
|}
Examples of correct code for this rule:
[[a|[b]]]
x<y