Re: org-babel guile source block bug in handling multiple values

[Zelphir Kaltstahl <zelphirkaltstahl@posteo.de>]

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On 3/7/23 20:52, Bruno Barbier wrote:
> Zelphir Kaltstahl<zelphirkaltstahl@posteo.de>  writes:
>
>
>> If org merely wraps in a `let`, it should not notice any of the multiple values
>> business, because that is something done internally in `let-values`.
>>
> The "let", to define the org variables, ends up putting the "import"
> inside the scheme expression, like this:
>
>        ;; -*- geiser-scheme-implementation: guile -*-
>        (let ((x '1)
>              (y '2))
>        (import (except (rnrs base) error vector-map)
>                 (only (guile)
>                       lambda*
>                       λ)
>                 ;; let-values
>                 (srfi srfi-11))
>
>        (let-values ([(a b) (values x y)])
>           (simple-format #t "~a ~a\n" a b))
>        )
>
>
> which raises an error when evaluated the first time (the second time,
> the "import" has already imported the new "let-values" feature
> (srfi-11), so, the evaluation works). You can test this manually in a
> guile session.
>
> I guess you'll have to use sessions, and do the "import" in a separate
> block first.
>
> Bruno

Hello Bruno!

Thank you for that explanation. Behaves exactly like you describe and explains 
things.

I wonder though, whether that let wrapped code should actually cause an error, 
or that is a bug in Guile.

Also thanks for the idea with sessions + separate import source block. I thought 
that should work, but apparently that also has the same error, when running for 
the first time:

~~~~START~~~~
#+name: scheme-time-imports
#+begin_src scheme :eval query-export :noweb strip-export :session scheme-time :results output replace drawer"
(import
  ;; let-values
  (srfi srfi-11))
#+end_src

#+RESULTS: scheme-time-imports

#+name: scheme-time
#+begin_src scheme :eval query-export :noweb strip-export :session scheme-time :results output replace drawer :var x=1 :var y=2
<<scheme-time-imports>>
(import (except (rnrs base) error vector-map)
         (only (guile)
               lambda*
               λ)
         ;; let-values
         (srfi srfi-11))

(let-values ([(a b) (values x y)])
   (simple-format #t "~a ~a\n" a b))
#+end_src

#+RESULTS: scheme-time
:results:
ice-9/boot-9.scm:1685:16: In procedure raise-exception:
Unbound variable: a

Entering a new prompt.  Type `,bt' for a backtrace or `,q' to continue.
scheme@(guile-user) [1]>
:end:
~~~~~END~~~~~

Regards,
Zelphir

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