From: Pit Capitain <pit@...>
Date: 2001-08-16T22:37:48+09:00
Subject: [ruby-talk:19894] Re: Why not?: Assigning to self

On 16 Aug 2001, at 21:00, Tobias Reif wrote:

> > Searching the web for something like rectangle/become/square I
> > found a language called cecil, that has so called predicate
> > subclasses, which seem to offer this functionality. See
> > http://www.cs.washington.edu/research/projects/cecil/cecil/www/ce
> > cil-home.html
> 
> An example:
> 
> ...
> template object rectangle isa shape;
> ...
> 
> http://www.students.stedwards.edu/~jgrover/language%20summary.html#Anchor-Exampl-11005

Too bad they don't implement Square... Do you know a link where 
the usage of predicate subclasses is shown?

Pit