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+
+T19977a.hs:11:7: error:
+ • Could not deduce (Show a) arising from a use of ‘f’
+ from the context: Show [a]
+ bound by the type signature for:
+ g :: forall a. Show [a] => a -> String
+ at T19977a.hs:10:1-28
+ Possible fix:
+ add (Show a) to the context of
+ the type signature for:
+ g :: forall a. Show [a] => a -> String
+ • In the expression: f x
+ In an equation for ‘g’: g x = f x