Support older versions of ghc.

Former-commit-id: 868324619197a844064e26425f68d5b214b9dbad
2026-09-18 03:12:40 +00:00 · 2019-09-13 12:48:36 +08:00 · 2019-09-13 12:48:36 +08:00 · 9499030dc5
commit 9499030dc5
parent 9ded319938
2 changed files with 3 additions and 1 deletions
--- a/videos/color-theory/color-theory.hs
+++ b/videos/color-theory/color-theory.hs
@ -9,6 +9,7 @@ import           Control.Monad
 import qualified Data.ByteString       as BS
 import qualified Data.Map              as Map
 import qualified Data.Text             as T
+import           Data.Monoid

 import           Codec.Picture
 import           Codec.Picture.Jpg