bug#56799: [PATCH v2] gexp: Handle *unspecified* as a gexp input.

[Maxim Cournoyer]

Hi,

Maxime Devos <maximedevos@telenet.be> writes:

> On 27-07-2022 22:20, Maxim Cournoyer wrote:
>
>> Fixes <https://issues.guix.gnu.org/56799>.
>>
>> * guix/gexp.scm (gexp->sexp)[*unspecified*]: Quote value when encountering 
>> it.
>
> I recommend writing a test case -- this patch does not actually do that.
>
> Instead, it returns the symbol x.
>
> In a ./pre-inst-env guix repl:
>
>> scheme@(guix-user)> ,use (guix)
>> scheme@(guix-user)> ,m (guix gexp)
>> scheme@(guix gexp)> ,enter-store-monad
>> store-monad@(guix gexp) (gexp->sexp #~(list #$*unspecified*)
>> "x86_64-linux" "aarch64-linux-gnu")
>> $1 = (list x)
> I don't know what exact semantics you had in mind but probably not this.

Indeed.  Fixed in v3 (which includes a test).

Thanks!

Maxim