Dear Guixers This is a follow-up on
https://lists.gnu.org/archive/html/help-guix/2022-01/msg00000.html Using the REPL, I traced the bug on my code trying to update fields of an operating-system records, which on gnu/system.scm are declared as "thunked". Guile is not my primary language. I would really appreciate some pointers here: - Why is it that I can't update those fields ? - I was able to ~1 month ago, but can't do that now. Why ? Is my use-case unsupported ? Should I expect other breaking change in the future ? i.e. was I using a non-public interface ? - How can I update those fields ? For example, given that "minimal-container" is an operating system, I can do the following: (set-fields minimal-container ((operating-system-host-name) "toto")) But not: (set-fields minimal-container ((operating-system-label) "toto")) while both fields are supposed to be strings, but label is "thunked". Thanks in advance for any help. Cheers, Edouard.