haskellPackages.tz is incompatible with new tzdata format

[roberth]

Describe the bug

Build failure.
Example:
https://hydra.nixos.org/build/129855941/nixlog/1

Upstream is working on a solution. nilcons/haskell-tz#26
When available, master can pick up the new hackage package. 20.09 will require a backport.

To Reproduce

1. In nixpkgs master, run nix-build haskellPackages.tz

Expected behavior

Build successfully.

Screenshots

Additional context

Notify maintainers

Metadata
Please run nix-shell -p nix-info --run "nix-info -m" and paste the result.

Maintainer information:

# a list of nixpkgs attributes affected by the problem
attribute:
# a list of nixos modules affected by the problem
module:

[flokli]

ExpectedButGot Nothing "2013-10-27 01:00:00" "2013-10-27 02:00:00"

Apparently, there were similar assumptions in the test code. File issue upstream and disable tests in the meantime?

[roberth]

No. tz isn't the only program that's incompatible with the new format. We've broken other packages assuming it was just impure test churn. See #102946

[roberth]

Upstream issue already exists for tz. Other issues idk, but I'm already a couple of rabbitholes deep...

[stale]

I marked this as stale due to inactivity. → More info

[roberth]

#102946 has solved the practical problem for NixOS users and other distros seem to take the same approach. I don't see a reason to switch to the slim format again. It'd be nice for upstream to implement this, but it's not relevant for nixpkgs anymore.