Fix more warnings

[ghc-base.git] / Data / Traversable.hs

diff --git a/Data/Traversable.hs b/Data/Traversable.hs
index 969e720..30aaee6 100644 (file)
--- a/Data/Traversable.hs
+++ b/Data/Traversable.hs
@@ -103,7 +103,7 @@ class (Functor t, Foldable t) => Traversable t where
 -- instances for Prelude types
 
 instance Traversable Maybe where
-        traverse f Nothing = pure Nothing
+        traverse _ Nothing = pure Nothing
         traverse f (Just x) = Just <$> f x
 
 instance Traversable [] where