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  1. {-# LANGUAGE FlexibleInstances #-}
  2.  
  3. instance Num String where
  4.   (+) = (++)
  5.   (*) = undefined
  6.   abs = undefined
  7.   signum = undefined
  8.   fromInteger = show
  9.   negate = undefined
  10.  
  11. main = print $ 2 + 2 == "4"
Success #stdin #stdout 0s 8388607KB
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Standard input is empty
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https://ideone.com/Vygy1i
language:
Haskell (ghc 8.4.4)
created:
7 years ago
visibility:
public

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