The version of dev-haskell/text has to be the same as build in into ghc.
Currently I stumbled over a version mismatch between ghc-8.4.3 (from haskell overlay) and
dev-haskell/text-188.8.131.52. The version bundled in ghc is 184.108.40.206.
When ghc and dev-haskell/text does not match, packages use _both_ versions and fail to compile
Combinations that I seen is:
The same is valid for the versions in main gentoo repo.
(In reply to Klaus Ethgen from comment #0)
> The version of dev-haskell/text has to be the same as build in into ghc.
That's correct. We'll need to fix eclass to enforce that match.