[mercury-users] map__foldl2

Fergus Henderson fjh at cs.mu.OZ.AU
Tue Dec 14 12:49:59 AEDT 1999

On 14-Dec-1999, Warwick Harvey <wharvey at cs.monash.edu.au> wrote:
> I also thought this looked a bit strange:
> > :- inst inst1 = bound(ground-unique ; ground-ground).
> I don't think this means what you intend it to mean.

In fact our intent is code like that should be illegal.
In the arguments to a bound/1 inst, you should not specify
the same functor name (in this case '-'/2) twice.

Unfortunately the compiler does not yet reject code like that.
Instead it goes ahead and generates code that almost certainly
does not do what you intend.

Fergus Henderson <fjh at cs.mu.oz.au>  |  "I have always known that the pursuit
WWW: <http://www.cs.mu.oz.au/~fjh>  |  of excellence is a lethal habit"
PGP: finger fjh at        |     -- the last words of T. S. Garp.
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