Error in error?

Error in error?

[sidhu1f]

According to the guile (version 3.0.7) reference manual, (error "foo
~a" 'bar) should output "foo bar" but instead the output is "foo ~a
bar".  Am I missing something or is there a bug in error?

Regards
sidhu1f

Re: Error in error?

[Linus Björnstam]

The error I find in the manual is:


Scheme Procedure: error msg arg …

    Raise an error with key misc-error and a message constructed by displaying msg and writing arg .... 

Where are you getting your info?

-- 
  Linus Björnstam

On Fri, 19 Aug 2022, at 01:44, sidhu1f wrote:
> According to the guile (version 3.0.7) reference manual, (error "foo
> ~a" 'bar) should output "foo bar" but instead the output is "foo ~a
> bar".  Am I missing something or is there a bug in error?
>
> Regards
> sidhu1f

Re: Error in error?

[Maxime Devos]

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On 19-08-2022 01:44, sidhu1f wrote:
> According to the guile (version 3.0.7) reference manual, (error "foo
> ~a" 'bar) should output "foo bar" but instead the output is "foo ~a
> bar".  Am I missing something or is there a bug in error?

You might need 'scm-error' instead:

(scm-error 'misc-error 'the-procedure-name "foo ~a" '("args") '())

The documentation in the manual is a bit confusing -- as 'scm-error' is 
mentioned right after 'error', you might easily read "message 
constructed by displaying msg and writing arg" as "it displays and 
writes using 'format' on msg and the arg ...". Some room for improvement 
there.

Greetings,
Maxime


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Re: Error in error?

[sidhu1f]

On Fri, 19 Aug 2022 19:46:11 +0530,
Linus Björnstam wrote:
>
> The error I find in the manual is:
>
> Scheme Procedure: error msg arg …
>
>     Raise an error with key misc-error and a message constructed by displaying msg and writing arg ....
>
> Where are you getting your info?

On Sat, 20 Aug 2022 02:09:59 +0530,
Maxime Devos wrote:
>
> (scm-error 'misc-error 'the-procedure-name "foo ~a" '("args") '())
>
> The documentation in the manual is a bit confusing -- as 'scm-error'
> is mentioned right after 'error', you might easily read "message
> constructed by displaying msg and writing arg" as "it displays and
> writes using 'format' on msg and the arg ...". Some room for
> improvement there.

You are both correct.

My motivation was to use the assert macro from guile-libs
(www.nongnu.org/guile-lib/doc/ref/debugging.assert/).  In assert.scm
(version 0.2.7), the error procedure invocation on line 62 uses "~a".
So should this invocation be replaced by scm-error instead?

My thanks to authors of both responses.

Regards
sidhu1f

On Sat, Aug 20, 2022 at 2:10 AM Maxime Devos <maximedevos@telenet.be> wrote:
>
>
> On 19-08-2022 01:44, sidhu1f wrote:
> > According to the guile (version 3.0.7) reference manual, (error "foo
> > ~a" 'bar) should output "foo bar" but instead the output is "foo ~a
> > bar".  Am I missing something or is there a bug in error?
>
> You might need 'scm-error' instead:
>
> (scm-error 'misc-error 'the-procedure-name "foo ~a" '("args") '())
>
> The documentation in the manual is a bit confusing -- as 'scm-error' is
> mentioned right after 'error', you might easily read "message
> constructed by displaying msg and writing arg" as "it displays and
> writes using 'format' on msg and the arg ...". Some room for improvement
> there.
>
> Greetings,
> Maxime
>

Re: Error in error?

[Maxime Devos]

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On 22-09-2022 01:17, sidhu1f wrote:
> You are both correct.
> 
> My motivation was to use the assert macro from guile-libs
> (www.nongnu.org/guile-lib/doc/ref/debugging.assert/).

Do you know that Guile already has an 'assert 'macro (see: (guile)rnrs 
base)?  It is less capable though (no ?r-exp), so maybe not suitable for 
your purposes.

> In assert.scm
> (version 0.2.7), the error procedure invocation on line 62 uses "~a".
> So should this invocation be replaced by scm-error instead?

It seems so to me, you could give it a try.

Greetings,
Maxime.

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