Found this one on accident today and was surprised. To reproduce:
- Remove your user account from your system configuration on
accident.
- `sudo guix system reconfigure'
- Realize your mistake. Observe that neither `su' nor `sudo'
work, because you don’t exist.
- Reboot in a state of mild panic.
- Select any previous system generation from GRUB.
Expected result: previous generations should have the account
which was deleted, since it was declared in the configurations
which produced them.
Actual result: They don’t.
-- Ian
