Re: warning: possibly unused local top-level variable `%foo?-procedure'

[Linus Björnstam]

Which version are you using? All my similar issues with srfi-9 went away last 
year when srfi things were marked maybe-unused.

I don't have a computer this week so I cannot try your code. Sorry. 

-- 
  Linus Björnstam

On Wed, 5 Jun 2024, at 17:02, Tomas Volf wrote:
> Hello,
>
> I am getting following warning from a guild compile:
>
>     warning: possibly unused local top-level variable `%foo?-procedure'
>
> And I am not sure how to tackle it.  This is my full source code:
>
>     (define-module (x)
>       #:use-module (srfi srfi-9)
>       #:export (<foo>
>                 foo?
>                 make-foo))
>
>     (define-record-type <foo> (make-foo) foo?)
>
> When I try to compile it:
>
>     $ guild compile -W 3 -o x.go x.scm
>     x.scm:7:0: warning: possibly unused local top-level variable 
> `%foo?-procedure'
>     wrote `x.go'
>
> I would (for obvious reasons) like to keep my compilation warning-free.  I can
> think of two approaches:
>
> 1. Export the %foo?-procedure
>      I think this would confuse downstream users, since they are not expected 
> to
>      use it directly.
>
> 2. Mark the procedure as used
>       In C I could use `(void)proc;', is there an equivalent of that construct
>       in Guile?
>
> Are there other options?  How are you approaching it?
>
> Thank you and have a nice day,
> Tomas Volf
>
> PS: I am not even sure why this warning happens, the `foo?' syntax transformer
> is exported and *does* reference it (as far as I can tell from ,expand).
>
> --
> There are only two hard things in Computer Science:
> cache invalidation, naming things and off-by-one errors.
>
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