This is a bug, but fixing it is very tricky. Consider what would happen if
example.mdwn were created: example/page.html and the rest of example/*
-would need to be updated to change the parentlink from a bare work to a
+would need to be updated to change the parentlink from a bare word to a
link to the new page. Now if example.mdwn were removed again, they'd need
to be updated again. So example/* depends on example. But it's even more
tricky, because if example.mdwn is modified, we _don't_ want to rebuild