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Re: set-current-module in .guile ?
From: |
Ludovic Courtès |
Subject: |
Re: set-current-module in .guile ? |
Date: |
Wed, 09 Apr 2008 17:05:19 +0200 |
User-agent: |
Gnus/5.11 (Gnus v5.11) Emacs/22.1 (gnu/linux) |
Hi,
I can reproduce the problem now, with Guile 1.8 and SLIB 3a5.
"Scott N. Walck" <address@hidden> writes:
> address@hidden:~]$ guile
> guile> (load "/usr/local/src/guile-scmutils/src/load.scm")
> guile> (module-use! (current-module) generic-environment)
> #f
> guile> +
> #<procedure g:+ args>
> guile> (+ (vector 5 6) (vector 7 8))
> Segmentation fault (core dumped)
That's because there's a circular reference in the modules:
guile> (module-uses generic-environment)
(#<directory (guile-user) b7c35620>)
guile> (current-module)
#<directory (guile-user) b7c35620>
IOW, `generic-environment' uses `(guile-user)' (the default module
that's used when one get to the REPL), and the `module-use!' line above
makes `(guile-user)' use `generic-environment'.
Thus, further variable lookups that are not satisfied by either module
are bound to fail: the `module_variable ()' function in `modules.c'
looks for the variable in `(guile-user)', then in `generic-environment',
then in `(guile-user)', and so on.
This should be reported as a `guile-scmutils' bug. One possibility is
to fix the way `generic-environment' is created in `kernel/genenv.scm'.
Guile-scmutils should really use modules in a more orthodox way rather
than expect users to fiddle with `set-current-module', `module-use!',
etc.
Thanks,
Ludovic.
- Re: set-current-module in .guile ?, (continued)
- Re: set-current-module in .guile ?, Jon Wilson, 2008/04/05
- RE: set-current-module in .guile ?, Walck, Scott, 2008/04/05
- Re: set-current-module in .guile ?, Ludovic Courtès, 2008/04/06
- RE: set-current-module in .guile ?, Walck, Scott, 2008/04/06
- Re: set-current-module in .guile ?, Ludovic Courtès, 2008/04/07
- RE: set-current-module in .guile ?, Walck, Scott, 2008/04/07
- Re: set-current-module in .guile ?, Ludovic Courtès, 2008/04/07
- Re: set-current-module in .guile ?, Scott N. Walck, 2008/04/07
- Re: set-current-module in .guile ?, Ludovic Courtès, 2008/04/08
- Re: set-current-module in .guile ?, Scott N. Walck, 2008/04/08
- Re: set-current-module in .guile ?,
Ludovic Courtès <=
- RE: set-current-module in .guile ?, Walck, Scott, 2008/04/09
Re: set-current-module in .guile ?, Neil Jerram, 2008/04/09