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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: Mon, 22 May 2017 21:45:17 +0200	[thread overview]
Message-ID: <87shjw3cc2.fsf@pobox.com> (raw)
In-Reply-To: <87shk24vdo.fsf@gnu.org> (Jan Nieuwenhuizen's message of "Thu, 18 May 2017 06:54:59 +0200")

On Thu 18 May 2017 06:54, Jan Nieuwenhuizen <janneke@gnu.org> writes:

>> This is the right thing:
>>
>>   (define-module (foo) #:export (baz))
>>   (define eval-module (current-module))
>>   (define bar 42)
>>   (define (baz) (eval 'bar eval-module))
>
> Thanks!...this works.  I'm very happy with this, it means that I can
> create an sexp-object format, yay!
>
> Earlier I tried several things eval, but did not see this `define
> eval-module' coming.  The above works, this does not work
>
>    (define-module (foo) #:export (baz))
>    (define bar 42)
>    (define (baz) (eval 'bar (current-module)))

current-module is dynamically scoped.  Consider:

  (define-module (qux)
    #:use-module (foo))
  
  (baz)

In this case the current module for the baz invocation is (qux).

Andy



  reply	other threads:[~2017-05-22 19:45 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
2017-05-18  4:54   ` Jan Nieuwenhuizen
2017-05-22 19:45     ` Andy Wingo [this message]
2017-05-22 20:19       ` Jan Nieuwenhuizen
2017-05-22 19:48     ` Andy Wingo

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