Last modified: 2010-02-20 19:45:38 UTC
If you look at the URL provided, you'll see at the top that it's trying to kick off the subpage navigation due to the presence of a slash in the title. However, there is no existing parent pages for this to be a subpage of, as the title has a leading slash. Basically, articles with leading slashes shouldn't kick the subpage navigation.
Well, articles with leading slashes are supposed to be illegal. :)
Well, bug 98 is currently RESOLVED FIXED, and Tim has expressed some doubts about whether we should ban them, so I wasn't clear on what the status of those is. Overall it would be nice if we could have more rather than fewer possible page titles. Certainly [[/dev/null]] is the correct page name.
Seems to be fixed?
I have opened bug 22597 which describes a related, but not identical oddity (perhaps what the original poster was getting at, I'm not sure). The other related problem is that if you create a link to [[{{SUBJECTPAGENAME}}]] on [[Talk:/dev/null]] you will get a link to [[Talk:/dev/null/dev/null]] - clearly not expected behaviour. This is a WONTFIX I think, but it's still nasty.