I'm getting lots of these failures. Has someone forgotten to do a submodule update? I'm up to date on a clean head and have done 'git submodule update' Help! Simon libraries/containers/Data/IntSet/Internal.hs:198:1: error: [-Wunused-imports, -Werror=unused-imports] The import of '<>' from module 'Data.Semigroup' is redundant | 198 | import Data.Semigroup (Semigroup((<>), stimes), stimesIdempotentMonoid) | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ libraries/containers/Data/IntSet/Internal.hs:220:1: error: [-Wunused-imports, -Werror=unused-imports] The import of 'Data.Foldable' is redundant except perhaps to import instances from 'Data.Foldable' To import instances alone, use: import Data.Foldable() | 220 | import Data.Foldable (Foldable()) | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^