Previously, if an invalid value was passed, the build would fail with:
error: attribute '"00:02:03"' missing
at /nix/store/sz92b5gqi0ma61d18fwbihi8p37mkvir-source/modules/services/nix-gc.nix:69:5:
68| in
69| freq.${frequency};
| ^
70|
There was an assertion that should have prevented this from happening
but the crash would happen before the assertion gets a chance to stop
the build with a nice error message.
This commit both gives the assertion a chance to trigger and improves
the assertion's error message.
3b930bb653