https://bugzilla.wikimedia.org/show_bug.cgi?id=35221

       Web browser: ---
             Bug #: 35221
           Summary: Categories can contain themselves
           Product: MediaWiki
           Version: unspecified
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: Categories
        AssignedTo: [email protected]
        ReportedBy: [email protected]
                CC: [email protected]
    Classification: Unclassified
   Mobile Platform: ---


It is possible to make categories contain themselves (eg Category:X can contain
Category:X in a list of its own members - the link works, clicking it takes you
to... Category X). This seems a rather silly thing to make possible; this bug
is asking for such nonsensical categorisation to be ignored when the category
page is displayed, so that if Category X does contain the code
"[[Category:X]]", it doesn't do anything. 

You might say "well categorising a category in itself is a silly thing to do,
so just don't do it" - but if you have a template that automatically
categorises into a category, and you want to display that template in the
category, you need to add special collision detection just because this
silliness is possible. Removing the silliness would make life quite a bit
simpler, templatewise.

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