GHC2021 and Safe cause a warning

{-# LANGUAGE GHC2021 #-} -- can be omitted
{-# LANGUAGE Safe #-}
module Example where

Causes a confusing, non-ignorable warning (i.e. -Werror will always fail the builds)

% /code/ghc/_buildstage1/bin/ghc -c Example.hs

<no location info>: warning:
    -XGeneralizedNewtypeDeriving is not allowed in Safe Haskell; ignoring -XGeneralizedNewtypeDeriving