$ nixos-rebuild switch --upgrade --show-trace
unpacking channels...
building Nix...
building the system configuration...
trace: warning: The option `services.redshift.longitude' defined in `/etc/nixos/configuration.nix' has been changed to `location.longitude' that has a different type. Please read `location.longitude' documentation and update your configuration accordingly.
trace: warning: The option `services.redshift.latitude' defined in `/etc/nixos/configuration.nix' has been changed to `location.latitude' that has a different type. Please read `location.latitude' documentation and update your configuration accordingly.
error: stack overflow (possible infinite recursion)