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rebindable6.hs:106:17: error:
No instance for (HasSeq (IO a -> t0 -> IO b))
arising from a do statement
(maybe you haven't applied a function to enough arguments?)
The type variable ‘t0’ is ambiguous
Relevant bindings include
g :: IO (Maybe b) (bound at rebindable6.hs:104:19)
f :: IO a (bound at rebindable6.hs:104:17)
test_do :: IO a -> IO (Maybe b) -> IO b
(bound at rebindable6.hs:104:9)
Potential instances:
instance HasSeq (IO a -> IO b -> IO b)
-- Defined at rebindable6.hs:52:18
In a stmt of a 'do' block: f
In the expression:
do { f;
Just (b :: b) <- g;
return b }
In an equation for ‘test_do’:
test_do f g
= do { f;
Just (b :: b) <- g;
return b }
rebindable6.hs:107:17: error:
No instance for (HasFail ([Char] -> t1))
arising from a do statement
(maybe you haven't applied a function to enough arguments?)
The type variable ‘t1’ is ambiguous
Potential instances:
instance HasFail (String -> IO a)
-- Defined at rebindable6.hs:57:18
In a stmt of a 'do' block: Just (b :: b) <- g
In the expression:
do { f;
Just (b :: b) <- g;
return b }
In an equation for ‘test_do’:
test_do f g
= do { f;
Just (b :: b) <- g;
return b }
rebindable6.hs:108:17: error:
No instance for (HasReturn (b -> t1))
arising from a use of ‘return’
(maybe you haven't applied a function to enough arguments?)
The type variable ‘t1’ is ambiguous
Relevant bindings include
b :: b (bound at rebindable6.hs:107:23)
g :: IO (Maybe b) (bound at rebindable6.hs:104:19)
test_do :: IO a -> IO (Maybe b) -> IO b
(bound at rebindable6.hs:104:9)
Potential instances:
instance HasReturn (a -> IO a) -- Defined at rebindable6.hs:42:18
In a stmt of a 'do' block: return b
In the expression:
do { f;
Just (b :: b) <- g;
return b }
In an equation for ‘test_do’:
test_do f g
= do { f;
Just (b :: b) <- g;
return b }
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