I'm running guix (GNU Guix) 19b662ea7c53a28270a783f10ca033d8c9d2a954, and
have /gnu/store/s32nba6rxx9x2kibsn6wsm1ixzhv64nl-emacs-26.1 installed.
When I then try to install haskell-mode with
guix package -i haskell-mode
the derivation build fails with
haskell-process.el:160:1:Error: Unused lexical variable
‘move-point-in-windows’
This is the same error as a failed build on Hydra[0].
I have opened an upstream bug report[1], but have not yet done more
troubleshooting.
Best,
Jack
[0] https://hydra.gnu.org/build/2766429/nixlog/1
[1] https://github.com/haskell/haskell-mode/issues/1601