Last modified: 2014-05-30 02:59:59 UTC
At line 42 of https://en.wikipedia.org/w/index.php?title=User:Thryduulf/sandbox&diff=567254040&oldid=566841354 attempting replace what appeared to be an empty image caption with "The [[Sun]]" (using ctrl+k for the link, no wikicode) resulted in the insertion instead of: The <a style="white-space:nowrap" data-mw="{"target":{"wt":"val","href":"../Template:Val"},"params":{"1":{"wt":"4.6"},"ul":{"wt":"byr"}},"i":0}" rel="mw:WikiLink" href="Sun">Sun</a> The images were left over from testing for Bug 52341 and so that bug may be related.
I'm pretty sure this was a horrible artefact of a nasty bug we fixed back in September; provisionally marking as WORKSFORME. Sorry for the ludicrously-slow triage.