patch for crash in d-lang.c's demangler

[Tom Tromey]

>>>>> "Brad" == Brad Roberts <braddr@puremagic.com> writes:

Brad> Agreed.  Your patch looks good.  I feel guilty about not
Brad> contributing a unit test to cover this case, so I shouldn't poke
Brad> you about not adding one either, but if you feel like feeling that
Brad> guilty... :)

:)

I think it would be good to have test cases for this code, but I'm not
in a good position to write them -- I don't know D.

I'll commit this patch tomorrow with a suitable ChangeLog entry.

Tom