robx
diff --git a/‎src/Data/GridShape.hs‎
Lines changed: 1 addition & 1 deletion b/‎src/Data/GridShape.hs‎
Lines changed: 1 addition & 1 deletion
@@ -158,7 +158,7 @@ edge p q = unorient $ edge' p q
 
 class Dual2D a where
 
-  type Dual a :: *
+  type Dual a :: Type
 
   dualE' :: Edge' a -> Edge' (Dual a)