(<>) needs the import of Data.Semigroup (ghc 8.2.2)

2021-03-16 20:31:41 +01:00 · 2021-03-16 20:31:41 +01:00 · 08b5e86536
commit 08b5e86536
parent 86eb25018e
1 changed files with 1 additions and 0 deletions
--- a/doc/cookbook/custom-errors/CustomErrors.lhs
+++ b/doc/cookbook/custom-errors/CustomErrors.lhs
@ -20,6 +20,7 @@ Extensions and imports:
 import           Data.Aeson
 import           Data.Proxy
 import           Data.Text
+import           Data.Semigroup
 import           GHC.Generics
 import           Network.Wai
 import           Network.Wai.Handler.Warp