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Re: Problem with macro expansion

From: Per Bothner <per at bothner dot com>
To: Colin Fleming <colin dot mailinglist at gmail dot com>
Cc: kawa at sourceware dot org
Date: Wed, 25 Nov 2009 09:37:02 -0800
Subject: Re: Problem with macro expansion
References: <7c6512110911250335p42fc48c4qb89630793064af0c@mail.gmail.com> <7c6512110911250338x7f371370l85083886cad2c115@mail.gmail.com>

On 11/25/2009 03:38 AM, Colin Fleming wrote:

(token open-vector "#(")

(define-syntax token
   (syntax-rules () ((_ name desc)
                     (define-constant name :: IElement (Element:new desc)))))

The (define-constant open-vector :: IElement (Element:new "#(")) is
what I'd like to make a macro out of, which should result in being
able to use the form (token open-vector "#(").

In the REPL this works, but when I try to compile the class, I get the error:

(compiling Tokens.scm to scheme.Tokens)
Tokens.scm:9:1: define-constant is only allowed in a<body>


The error message is confusing, but the problem appears to be
because you have a macro usage before the macro application.
In general that doesn't work, especially in this case where the
macro expands into a definition.
--
	--Per Bothner
per@bothner.com   http://per.bothner.com/

Follow-Ups:
- Re: Problem with macro expansion
  - From: Jamison Hope

References:
- Problem with macro expansion
  - From: Colin Fleming

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