----- Original Message -----
From: "Marc Feeley" <xxxxxx@iro.umontreal.ca>
To: "Chongkai Zhu" <xxxxxx@cs.utah.edu>
Cc: <srfi-90@srfi.schemers.org>
Sent: Sunday, November 12, 2006 6:54 AM
Subject: Re: reference implementation

> It is impossible to write a portable and complete implementation of
> the weak-keys and weak-values parameters because weak references are
> not standard.

Seems that we should introduce another SRFI to define weak references.

Chongkai