Remove Elem from servant-foreign

servant-foreign/src/Servant/Foreign/Internal.hs

@@ -21,6 +21,7 @@ import           GHC.TypeLits
 import qualified Network.HTTP.Types as HTTP
 import           Prelude hiding (concat)
 import           Servant.API
+import           Servant.API.TypeLevel
 
 
 newtype FunctionName = FunctionName { unFunctionName :: [Text] }
@@ -135,15 +136,6 @@ makeLenses ''Req
 defReq :: Req ftype
 defReq = Req defUrl "GET" [] Nothing Nothing (FunctionName [])
 
--- | To be used exclusively as a "negative" return type/constraint
--- by @'Elem`@ type family.
-class NotFound
-
-type family Elem (a :: *) (ls::[*]) :: Constraint where
-  Elem a '[]         = NotFound
-  Elem a (a ': list) = ()
-  Elem a (b ': list) = Elem a list
-
 -- | 'HasForeignType' maps Haskell types with types in the target
 -- language of your backend. For example, let's say you're
 -- implementing a backend to some language __X__, and you want

servant/src/Servant/API/TypeLevel.hs

@@ -7,7 +7,7 @@
 module Servant.API.TypeLevel where
 
 import GHC.Exts(Constraint)
-import Servant.API.Capture ( Capture )
+import Servant.API.Capture ( Capture, CaptureAll )
 import Servant.API.ReqBody ( ReqBody )
 import Servant.API.QueryParam ( QueryParam, QueryParams, QueryFlag )
 import Servant.API.Header ( Header )