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rw.hs:14:47:
Couldn't match expected type ‘a’ with actual type ‘Int’
‘a’ is a rigid type variable bound by
the type signature for writeInt :: T a -> IORef a -> IO ()
at rw.hs:12:12
Relevant bindings include
ref :: IORef a (bound at rw.hs:13:12)
v :: T a (bound at rw.hs:13:10)
writeInt :: T a -> IORef a -> IO () (bound at rw.hs:13:1)
In the second argument of ‘writeIORef’, namely ‘(1 :: Int)’
In the expression: writeIORef ref (1 :: Int)
In a case alternative: ~(Li x) -> writeIORef ref (1 :: Int)
rw.hs:19:51:
Couldn't match type ‘a’ with ‘Bool’
‘a’ is a rigid type variable bound by
the type signature for readBool :: T a -> IORef a -> IO ()
at rw.hs:16:12
Expected type: a -> Bool
Actual type: Bool -> Bool
Relevant bindings include
ref :: IORef a (bound at rw.hs:17:12)
v :: T a (bound at rw.hs:17:10)
readBool :: T a -> IORef a -> IO () (bound at rw.hs:17:1)
In the second argument of ‘(.)’, namely ‘not’
In the second argument of ‘(>>=)’, namely ‘(print . not)’
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