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annfail10.hs:9:1: error:
• Ambiguous type variable ‘a0’ arising from an annotation
prevents the constraint ‘(Data.Data.Data a0)’ from being solved.
Probable fix: use a type annotation to specify what ‘a0’ should be.
These potential instances exist:
instance (Data.Data.Data a, Data.Data.Data b) =>
Data.Data.Data (Either a b)
-- Defined in ‘Data.Data’
instance Data.Data.Data Ordering -- Defined in ‘Data.Data’
instance Data.Data.Data a => Data.Data.Data (Maybe a)
-- Defined in ‘Data.Data’
...plus 16 others
...plus 50 instances involving out-of-scope types
(use -fprint-potential-instances to see them all)
• In the annotation: {-# ANN f 1 #-}
annfail10.hs:9:11: error:
• Ambiguous type variable ‘a0’ arising from the literal ‘1’
prevents the constraint ‘(Num a0)’ from being solved.
Probable fix: use a type annotation to specify what ‘a0’ should be.
These potential instances exist:
instance Num Integer -- Defined in ‘GHC.Num’
instance Num Double -- Defined in ‘GHC.Float’
instance Num Float -- Defined in ‘GHC.Float’
...plus two others
...plus 19 instances involving out-of-scope types
(use -fprint-potential-instances to see them all)
• In the annotation: {-# ANN f 1 #-}
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