In the fossil version dated 2010-03-18 14:20:33, When the wiki is set to HTML mode and the [some link] syntax is used, in the generated HTML a stray <p></p> tag is inserted starting before the link, so for example this html-mode wikitext:

<verbatim>
<p>You should do a [TODO] today!</p>
</verbatim>

Is turned into this html:
<verbatim>
<p>You should do a <p><a
</verbatim>

Which displayed looks roughly like this (notice unexpected line break):
<verbatim>
You should do a
TODO today!
</verbatim>

This makes the square bracket link syntax pretty much unusable when in HTML mode in this version.