I have pandoc installed on my f24 which installed ghc-nats as a dependency. Trying to upgrade to f25 through system-upgrade leads to "Erreur : package ghc-nats-0.2-3.fc24.x86_64 requires libHSarray-0.5.0.0-ghc7.8.4.so()(64bit), but none of the providers can be installed" This is expected as ghc-nats has been removed from f25. However, having an Obsoletes: ghc-nats <= 0.2.3 Conflicts: ghc-nats <= 0.2.3 in ghc (or a more appropriate package) would have made upgrades smoother. Passing --allowerasing to dnf system-upgrade also lets me move forward with the upgrade.
Sorry I missed this. The ghc-obsoletes package (from ghc-rpm-macros) now has: Obsoletes: ghc-nats <= 0.2, ghc-nats-devel <= 0.2 since early January. Please reopen if problems persist.