FmtComb.hs:42:10: error

[jose1711]

Hi, I am getting the following issue during FmtComb compilation on Arch Linux.

17 | import Control.Applicative
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[3 of 5] Compiling FmtComb          ( FmtComb.hs, dist/build/mbox-list/mbox-list-tmp/FmtComb.dyn_o )

FmtComb.hs:42:10: error:
    • Could not deduce (Semigroup (ReaderMsg w))
        arising from the superclasses of an instance declaration
      from the context: Monoid w
        bound by the instance declaration at FmtComb.hs:42:10-41
    • In the instance declaration for ‘Monoid (ReaderMsg w)’
   |
42 | instance Monoid w => Monoid (ReaderMsg w) where

Haskell: 8.6.5.