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T12921.hs:4:1: 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.
Potentially matching instances:
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’
...plus 17 others
...plus 50 instances involving out-of-scope types
(use -fprint-potential-instances to see them all)
• In the annotation:
{-# ANN module "HLint: ignore Reduce duplication" #-}
T12921.hs:4:16: error:
• Ambiguous type variable ‘a0’ arising from the literal ‘"HLint: ignore Reduce duplication"’
prevents the constraint ‘(Data.String.IsString
a0)’ from being solved.
Probable fix: use a type annotation to specify what ‘a0’ should be.
Potentially matching instance:
instance (a ~ Char) => Data.String.IsString [a]
-- Defined in ‘Data.String’
...plus two instances involving out-of-scope types
(use -fprint-potential-instances to see them all)
• In the annotation:
{-# ANN module "HLint: ignore Reduce duplication" #-}
T12921.hs:7:8: error:
Variable not in scope: choice :: [a0] -> Int -> Int
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