Dear list, https://guix.gnu.org/manual/devel/en/html_node/Service-Types-and-Services.html still references the $ construct which apparently should be replaced by match-record which is not sensitive to record slot order. best regards, -- Raffael Mancini IT administrator and developer Service d'information digital sur le patrimoine naturel (SIDPNAT) Musée National d'Histoire Naturelle Luxembourg https://mnhn.lu