Path: utzoo!attcan!uunet!lll-winken!lll-tis!ames!killer!pollux!ti-csl!mips!gateley
From: gateley@mips.csc.ti.com (John Gateley)
Newsgroups: comp.lang.scheme
Subject: Re: Non-upward-compatibility of Chez Scheme versions
Keywords: define-macro!, expansion patterns, closures
Message-ID: <54901@ti-csl.CSNET>
Date: 25 Jul 88 17:33:02 GMT
References: <1709@kalliope.rice.edu>
Sender: news@ti-csl.CSNET
Reply-To: gateley@mips.UUCP (John Gateley)
Organization: TI Computer Science Center, Dallas
Lines: 14

In article <1709@kalliope.rice.edu> dorai@titan.rice.edu (Dorai Sitaram) writes:
>`define-macro!', the form used to define macros in older versions of 
>Chez Scheme [TM, Cadence Research Systems] is also provided in the current 
>version (along with the fancier `extend-syntax'/`with'). However, the older 
>version (v.1.1, 1985) seems more powerful (expressive) than the current one 
>(v.2.0.3, 1987)!

Just a side note: you seem to be saying that the define-macro! form is more
powerful than extend-syntax and with. This is not true. Extend-syntax can be
used to do 3-d programming (the technique you describe in your message), and
any macro. It is completely general.

John Gateley

p.s. Extend-syntax was created by Eugene Kohlbecker.