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From: net@opal.cs.tu-berlin.de (Oliver Laumann)
Newsgroups: comp.lang.scheme
Subject: Re: Non Chez Nous
Message-ID: <2884@kraftbus.cs.tu-berlin.de>
Date: 17 Mar 91 10:39:04 GMT
References: <1991Mar15.163509.12130@rice.edu> <2877@kraftbus.cs.tu-berlin.de> <1991Mar16.155847.4314@rice.edu>
Organization: Technical University of Berlin, Germany
Lines: 18

In matthias@leto.rice.edu (Matthias Felleisen) writes:
> > ... dynamic-wind and fluid-let (how are you going
> >to define this in an R*RS-implementation?), etc.
> ...
> This is a standard result in the literature: 
>   {Haynes, C. and D.P. Friedman}.  Embedding continuations in procedural
>   objects. [...]

Thanks for the reference.  I realize that it must be possible to
write a procedure in R*RS-Scheme that accomplishes the same
functionality as Chez Scheme's fluid-let, but note that fluid-let is a
special form.  There is no language construct in the R*RS (yet?) that
allows one to define a new special form.  Thus, you *still* have to
edit each occurrence of fluid-let in a Chez Scheme program in order to
make it R*RS-conforming.

--
Oliver Laumann    net@tub.cs.tu-berlin.de  net@tub.UUCP  net@pogo.ai.mit.edu