[bug#50843] [PATCHES] Stackage update to 18.10.

[Lars-Dominik Braun]

Hi everyone,

I just pushed to the wip-haskell branch (it’s based on master),
which now contains various changes to haskell-build-system as well
as an update to Stackage 18.10 or the latest Hackage package version
where applicable. CI is currently building the changes[1], but from
local building I know all but three packages using haskell-build-system
build. These are ngless, cabal-install and idris. I need your help to
fix them!  There are also packages that cannot be updated via `guix
refresh` currently. They have been left mostly untouched.

I was also thinking about unconditionally adding
--allow-newer/--allow-older to haskell-build-system, so patching
.cabal-files is not necessary any more. Thoughs?

Let’s use this issue to track/review the changes and provide feedback
on them.

Thank you very much,
Lars

[1] https://ci.guix.gnu.org/eval/23961