add missing extension

reflex-frp · Jan 16, 2020 · d8c07ab · d8c07ab
1 parent 077aa9b
commit d8c07ab
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/src/Data/Patch/IntMap.hs b/src/Data/Patch/IntMap.hs
@@ -2,6 +2,7 @@
 {-# LANGUAGE DeriveFunctor #-}
 {-# LANGUAGE DeriveTraversable #-}
 {-# LANGUAGE GeneralizedNewtypeDeriving #-}
+{-# LANGUAGE MultiParamTypeClasses #-}
 {-# LANGUAGE TypeFamilies #-}
 -- | Module containing 'PatchIntMap', a 'Patch' for 'IntMap' which allows for
 -- insert/update or delete of associations.