Debuginfo is enabled (%global debug_package %{nil} is missing).

Thanks for testing.

I did some digging and it turned out that with redhat-rpm-config installed
it depended on the position of %ghc_lib_package in the .spec file.
So for consistency I can going to revert that change in ghc-rpm-macros
and cabal2spec and we will have to keep unsetting debug_package
in our .spec files.

Thanks, Jens