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  1. data Pencil = Pencil deriving Eq
  2.  
  3. newtype Box a = Box [a]
  4.  
  5. pencilInBox = Box [Pencil]
  6. getPencilFromBox (Box (x:_)) = x
  7.  
  8. main = print $ Pencil == getPencilFromBox pencilInBox
Success #stdin #stdout 0s 0KB
comments (?)
stdin 
Standard input is empty
stdout 
True
https://ideone.com/SkODfT
language:
Haskell (ghc 8.4.4)
created:
6 years ago
visibility:
public

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