23 Jul
2024
23 Jul
'24
8:08 p.m.
On Tue, 23 Jul 2024, Tom Ellis wrote:
On Tue, Jul 23, 2024 at 04:51:34PM +0200, Henning Thielemann wrote:
I compiled with:
$ ghc-9.6.6 -package lens -c src/Ganeti/LensPlain.hs
A major difference between 9.0 and 9.2 is that GHC2021 is enabled by default in 9.2. GHC2021 enables PolyKinds, and presumably what used to be assumed to be * (Type) is now generalized to k2.
The simplest solution is probably just to put
{-# LANGUAGE NoPolyKinds #-}
at the top of LensPlain.hs. The reason it works as part of a Cabal project is that Cabal does not turn on GHC2021 by default.
Perfect! That solves the problem and explains everything. I guess I could be surprised for some more weeks.