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[ghc-hetmet.git]
/
ghc
/
compiler
/
tests
/
deriving
/
drv001.hs
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--!!! canonical weird example for "deriving"
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module ShouldSucceed where
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data X a b
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= C1 (T a)
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| C2 (Y b)
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| C3 (X b a)
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deriving (Read, Show)
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data Y b
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= D1
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| D2 (X Int b)
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deriving (Read, Show)
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data T a
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= E1
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instance Eq a => Show (T a) where
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showsPrec = error "show"
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instance Eq a => Read (T a) where
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readsPrec = error "read"