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Re: [Chicken-users] Modules and environments
From: |
Peter Bex |
Subject: |
Re: [Chicken-users] Modules and environments |
Date: |
Sun, 30 Aug 2009 19:38:13 +0200 |
User-agent: |
Mutt/1.4.2.3i |
On Sun, Aug 30, 2009 at 07:20:33PM +0200, Thomas Chust wrote:
> Hello,
>
> following your logic, the code
>
> (use environments)
>
> (eval
> '(define-syntax hello (syntax-rules () [(hello) (print "hello")]))
> (interaction-environment))
>
> (print
> (environment-has-binding? (interaction-environment) 'hello))
>
> (eval
> '(hello)
> (interaction-environment))
>
> should also fail in the fourth statement, since the third statement
> prints #f ...
I disagree. If this should print #t you should also be able to obtain
a reference to the macro using (eval 'hello (interaction-environment)),
but that's not possible since macros are not first-class.
It prints "Error: unbound variable". The error message is clear enough:
macros are not considered to be variable bindings, so logically,
environment-has-binding? should never return #t on macro names.
IMO this case is irrelevant to the behaviour with modules.
Cheers,
Peter
--
http://sjamaan.ath.cx
--
"The process of preparing programs for a digital computer
is especially attractive, not only because it can be economically
and scientifically rewarding, but also because it can be an aesthetic
experience much like composing poetry or music."
-- Donald Knuth
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- [Chicken-users] Modules and environments, Peter Bex, 2009/08/30
- Re: [Chicken-users] Modules and environments, Thomas Chust, 2009/08/30
- Re: [Chicken-users] Modules and environments, Peter Bex, 2009/08/30
- Re: [Chicken-users] Modules and environments, Thomas Chust, 2009/08/30
- Re: [Chicken-users] Modules and environments,
Peter Bex <=
- Re: [Chicken-users] Modules and environments, Thomas Chust, 2009/08/30
- Re: [Chicken-users] Modules and environments, Peter Bex, 2009/08/30
- Re: [Chicken-users] Modules and environments, Thomas Chust, 2009/08/30
- Re: [Chicken-users] Modules and environments, Peter Bex, 2009/08/30
- Re: [Chicken-users] Modules and environments, Kon Lovett, 2009/08/30
- Re: [Chicken-users] Modules and environments, Peter Bex, 2009/08/30
- [Chicken-users] Re: Modules and environments, felix, 2009/08/31