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

[Maxime Devos]

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

$1 = (list x)

store-monad@(guix gexp) (gexp->sexp #~(list #$*unspecified*) "x86_64-linux" "aarch64-linux-gnu")

I don't know what exact semantics you had in mind but probably not this.

Greetings,
Maxime.

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