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[ghc-hetmet.git]
/
ghc
/
tests
/
deriving
/
should_run
/
drvrun001.hs
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-- Test newtype derived instances
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newtype Age = MkAge Int deriving (Eq, Show)
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instance Num Age where
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(+) (MkAge a) (MkAge b) = MkAge (a+b)
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main = print (MkAge 3 + MkAge 5)