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Re: primitive eval with module => Unbound variable?

From: Andy Wingo
Subject: Re: primitive eval with module => Unbound variable?
Date: Wed, 17 May 2017 21:44:02 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1 (gnu/linux)

On Tue 16 May 2017 23:59, Jan Nieuwenhuizen <address@hidden> 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))



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