CI are failing on master
$ stack setup
Writing implicit global project config file to: /root/.stack/global-project/stack.yaml
Note: You can change the snapshot via the resolver field there.
Using latest snapshot resolver: lts-12.0
Downloading lts-12.0 build plan ...
Downloaded lts-12.0 build plan.
No setup information found for ghc-8.4.3 on your platform.
This probably means a GHC bindist has not yet been added for OS key 'linux64-ncurses6', 'linux64-tinfo6'.
Supported versions: ghc-7.8.4, ghc-7.10.2, ghc-7.10.3, ghc-8.0.1, ghc-8.0.2, ghc-8.2.1, ghc-8.2.2, ghc-8.4.1, ghc-8.4.2
ERROR: Job failed: exit code 1
There was a new Haskell version released.