need charAt that isn't exported from Data.String any more

Author: CarstenKoenig

src/Data/Argonaut/Decode/Class.purs

@@ -12,7 +12,7 @@ import Data.Int (fromNumber)
 import Data.List (List(..), (:), fromFoldable)
 import Data.Map as M
 import Data.Maybe (maybe, Maybe(..))
-import Data.String (charAt)
+import Data.String.Data.String.CodeUnits (charAt)
 import Data.Traversable (traverse)
 import Data.Tuple (Tuple(..))
 import Foreign.Object as FO