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bug#36682: Error in Guile scripting examples
From: |
Maxim Cournoyer |
Subject: |
bug#36682: Error in Guile scripting examples |
Date: |
Mon, 12 Dec 2022 20:08:28 -0500 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.2 (gnu/linux) |
Hi,
Maxim Cournoyer <maxim.cournoyer@gmail.com> writes:
[...]
> I have the following two files:
>
> fact:
>
> #!/run/current-system/profile/bin/guile \
> -e main -s
> !#
> (define-module (fact)
> #:export (fact))
>
> (define (fact n)
> (if (zero? n) 1
> (* n (fact (- n 1)))))
>
> (define (main args)
> (display (fact (string->number (cadr args))))
> (newline))
>
>
> fac:
>
> #!/run/current-system/profile/bin/guile \
> -e (@@ (fac) main) -s
> !#
> (define-module (fac)
> #:export (main))
>
> (use-modules (fact))
>
> (define (choose n m)
> (/ (fact m) (* (fact (- m n)) (fact n))))
>
> (define (main args)
> (let ((n (string->number (cadr args)))
> (m (string->number (caddr args))))
> (display (choose n m))
> (newline)))
>
>
> But with Guile 3.0.8, this gives me:
>
> ./fac 5 20
> ice-9/read.scm:126:4: In procedure lp:
> #<unknown port>:1:4: unexpected end of input while searching for: )
>
> Which I don't understand.
OK, so what is apparently problematic with modules is the use of '-e (@@
(module-name) proc-name)' with Guil modules. For the 'fac' file above,
modifying it like this:
--8<---------------cut here---------------start------------->8---
#!/run/current-system/profile/bin/guile \
-e (fac) -s
!#
(define-module (fac)
#:export (main))
(use-modules (fact))
(define (choose n m)
(/ (fact m) (* (fact (- m n)) (fact n))))
(define (main args)
(let ((n (string->number (cadr args)))
(m (string->number (caddr args))))
(display (choose n m))
(newline)))
--8<---------------cut here---------------end--------------->8---
works. This relies on 'main' being defined and public. I hope that
helps!
--
Thanks,
Maxim