[m-rev.] Fast string library

[Ralph Becket]

> From: Simon Taylor [mailto:stayl at cs.mu.OZ.AU]
> Sent: 15 May 2001 03:34
> 
> > :- type str
> >     --->    str(int, string)            % length.
> >     ;       sub(int, int, str)          % index, length.
> >     ;       cat(int, str, str).         % length.
> 
> The big problem with this kind of string representation is that
> the builtin comparison operation won't work properly, and we
> don't yet allow user-defined comparison predicates. This means
> that using `str's as keys in a map won't do what you want.
> 
> This module probably isn't really usable until that's fixed.

You're right, of course.  Typeclasses seem like the right thing
for the job...  another one for v2.

- Ralph
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