include hashable

protolude.cabal

@@ -68,6 +68,7 @@ library
     async            >= 2.1  && <2.2,
     deepseq          >= 1.3  && <1.5,
     containers       >= 0.5  && <0.6,
+    hashable         >= 1.2  && <1.3,
     mtl              >= 2.1  && <2.3,
     transformers     >= 0.4  && <0.6,
     text             >= 1.2  && <1.3,

src/Protolude.hs

@@ -155,6 +155,14 @@ import Data.List as X (
   , zip
   )
 
+-- Hashing
+import Data.Hashable as X (
+    Hashable
+  , hash
+  , hashWithSalt
+  , hashUsing
+  )
+
 import Data.Map as X (Map)
 import Data.Set as X (Set)
 import Data.Sequence as X (Seq)