Re: dabbrev-expand for the minibuffer

[Richard Stallman]

    They seem like two implementations of the same thing; is there a reason
    to have both?

dabbrev is a "standard" feature, documented in the manual, with a
standard key binding.  hippie-expand is more obscure.

It may well be that hippie-expand can do everything dabbrev does and
more.  But the crucial question is whether it is an upward-compatible
dabbrev replacement convenent for people like me that use dabbrev.
(I don't know the answer.)