[mercury-users] Mercury Modes Problem

[Zoltan Somogyi]

On 28-May-2002, Richard A. O'Keefe <ok at cs.otago.ac.nz> wrote:
> That's because so-called "difference LISTS" were always a really stupid
> idea.  The idea that worked is "list difference PAIRS" and Mercury uses
> them heavily.  (DCG notation.)

I agree. However, when I made this point in a talk at ICLP 87, lots of people
told me that *they* thought difference lists (and not just pairs) were a great
idea and a neat hack.

Zoltan.
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