Klaus Klein asked me:
> > It looks like tab expansion is screwed up.
>
> Uh, excuse the stupid question, but are you really `-current'?
> I _thought_ I had fixed this ~2 weeks ago... :-/

And sure enough, I last built a kernel two days *before* the fix was
committed.  I now have an almost up-to-date kernel and tabs work just
fine.

No wonder the code looked right when I stared at it.  ;-)