1 files changed, 8 insertions, 19 deletions

diff --git a/Example.hs b/Example.hs
index a1af925..9fb9e0b 100644
--- a/Example.hs
+++ b/Example.hs
@@ -1,4 +1,4 @@
-{-# LANGUAGE DeriveGeneric #-}
+{-# LANGUAGE DeriveGeneric, DeriveAnyClass #-}
 module Main where
 
 import GHC.Generics
@@ -7,25 +7,16 @@ import Data.Proxy
 
 data FooArgs = FooArgs { arg1 :: Int
                        , arg2 :: String
-                       } deriving (Generic, Show)
-instance ArgParser FooArgs
-instance ToArgs FooArgs
-instance ArgHelper FooArgs
+                       } deriving (Show, Generic, Coalpit)
 
 data FooBar = Foo FooArgs
             | Bar
-            deriving (Generic, Show)
-instance ArgParser FooBar
-instance ToArgs FooBar
-instance ArgHelper FooBar
+            deriving (Show, Generic, Coalpit)
 
 data Input = Input { something :: Maybe String
                    , fooBar :: Maybe FooBar
                    , fooBar2 :: FooBar
-                   } deriving (Generic, Show)
-instance ArgParser Input
-instance ToArgs Input
-instance ArgHelper Input
+                   } deriving (Show, Generic, Coalpit)
 
 main :: IO ()
 main = do
@@ -39,18 +30,16 @@ main = do
   print (fromArgs defOpt args :: Either String Input)
 
 data Test = Test { foo :: [Int], bar :: Maybe String }
-  deriving (Generic, Show)
-
-instance ArgParser Test
-instance ToArgs Test
-instance ArgHelper Test
+  deriving (Show, Generic, Coalpit)
 
 help :: IO ()
 help = do
   mapM_ (\(o, x, y) -> print o >> print x >> putStrLn y) $
     [ let opts = defOpt { alwaysUseSelName = ausn
                         , omitNamedOptions = ono }
-      in ((ausn, ono), toArgs opts (Test [] vals), argHelper opts [] (Proxy :: Proxy Test))
+      in ( (ausn, ono)
+         , toArgs opts (Test [] vals)
+         , argHelper opts [] (Proxy :: Proxy Test))
       | ausn <- [True, False]
       , ono <- [True, False]
       , vals <- [Just "a string", Nothing]]