There is no shortage of curious behaviour in our parser when you look
hard enough:
foo
(note the space at left, this is what I call a 'spaceblock' and
renders as <pre>foo</foo>)
<pre>foo</pre>
(again with space, renders exactly as before - the parser evidently
decides the extra <pre> is redundant)
But what about:
foo </pre>
Strangely enough, this renders without a <pre> block at all.
Steve