From: Andy Wingo <wingo@pobox.com>
To: Jan Nieuwenhuizen <janneke@gnu.org>
Cc: guile-user@gnu.org
Subject: Re: primitive eval with module => Unbound variable?
Date: Wed, 17 May 2017 21:44:02 +0200 [thread overview]
Message-ID: <8737c3nu9p.fsf@pobox.com> (raw)
In-Reply-To: <87ziec4g62.fsf@gnu.org> (Jan Nieuwenhuizen's message of "Tue, 16 May 2017 23:59:01 +0200")
On Tue 16 May 2017 23:59, Jan Nieuwenhuizen <janneke@gnu.org> writes:
> This code works when not put in a module; make it a module and I get
>
> => ERROR: Unbound variable: bar
I assume you mean that this doesn't work:
(define-module (foo) #:export (baz))
(define bar 42)
(define (baz) (primitive-eval 'bar))
Then from another module you do (use-modules (foo)) and try to (baz).
The thing is that primitive-eval evaluates its expression with respect
to the current module. The current module when you do (use-modules
(foo)) isn't (foo) -- it's the importing module.
This is the right thing:
(define-module (foo) #:export (baz))
(define eval-module (current-module)
(define bar 42)
(define (baz) (eval 'bar eval-module))
Cheers,
Andy
next prev parent reply other threads:[~2017-05-17 19:44 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-16 21:59 primitive eval with module => Unbound variable? Jan Nieuwenhuizen
2017-05-17 17:58 ` Vladimir Zhbanov
2017-05-17 19:44 ` Andy Wingo [this message]
2017-05-18 4:54 ` Jan Nieuwenhuizen
2017-05-22 19:45 ` Andy Wingo
2017-05-22 20:19 ` Jan Nieuwenhuizen
2017-05-22 19:48 ` Andy Wingo
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