Hi, 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. Greetings, Maxime.