Maxime Devos schreef op do 23-12-2021 om 06:59 [+0000]: > Philip McGrath schreef op wo 22-12-2021 om 23:25 [-0500]: > > G-expressions currently do not consistently preserve the distinction > > between #nil and '(), which causes trouble for programs that rely on > > that distinction. In particular, the issue affects programs that use > > (guix build json), because that library uses #nil to represent the JSON > > value `null', whereas it uses '() to represent an empty JSON array. > > The constant #nil is only for elisp compatibility and not something > supposed to be used in Scheme code that isn't for Scheme/elisp > compatibility, so this seems more a bug in (guix build json) to me.
That said, it would be less surprising if the #nil/() distinction is preserved by gexp->derivation and friends. This can be done by writing our own 'write' procedure. Downside: it might be less efficient than Guile's write which is implemented in C. Can be resolved by writing our own 'write' procedure in C. Greetings, Maxime.
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