Re: [MIT-Scheme-users] define "keyword" as variable?

[Aaron S. Hawley]

On Thu, 21 Aug 2003, Kean Heng Lim wrote:

> Hi,
>
> Scheme got any reserved words?

MIT Scheme Reference 1.4.3 Special Form Syntax
http://www.gnu.org/software/mit-scheme/documentation/scheme_2.html#SEC27

> What will happens if someone use define as variable?

um *shrug*, don't know.  you can't use "define" again?  that's for sure.

> How to recover original meaning of define then?

(unbind-variable (the-environment) 'define)

more at:

MIT Scheme Reference 1.2.2 Environment Concepts
http://www.gnu.org/software/mit-scheme/documentation/scheme_2.html#SEC9

and:

MIT Scheme Reference 13 Environments
http://www.gnu.org/software/mit-scheme/documentation/scheme_14.html#SEC136

/a

> Thanks in advanced

> Scheme Microcode Version 14.9
> MIT Scheme running under Microsoft Windows NT 4.0 (Build 1381; Service Pack
> 6) IA-32
>
> Scheme saved on Tuesday June 18, 2002 at 12:23:59 AM
>   Release 7.7.1
>   Microcode 14.9
>   Runtime 15.1
>   Win32 1.6
>
> 1 ]=> (define lambda 1)
> ; Value: lambda
>
> 1 ]=> (define define 0)
> ; Value: define
>
>
> Regards,
> KeanHeng