Add @since annotation to Data.Data.mkConstrTag

libraries/ghc-internal/src/Data/Data.hs

@@ -625,6 +625,8 @@ mkDataType str cs = DataType
                         }
 
 -- | Constructs a constructor
+--
+-- @since 4.16.0.0
 mkConstrTag :: DataType -> String -> Int -> [String] -> Fixity -> Constr
 mkConstrTag dt str idx fields fix =
         Constr