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  1. {-# OPTIONS -fglasgow-exts  #-}
  2.  
  3.  
  4. f :: Maybe (forall a. [a] -> [a]) -> Maybe ([Int], [Char])
  5. f (Just g) = Just (g [3], g "hello")
  6. f Nothing  = Nothing
  7.  
  8. main   = print $ f (Just reverse)
Success #stdin #stdout 0.02s 3544KB
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Standard input is empty
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Just ([3],"olleh")
https://ideone.com/KMASZy
language:
Haskell (ghc 8.4.4)
created:
11 years ago
visibility:
public

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