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gadtSyntaxFail003.hs:7:5: error:
• Data constructor ‘C1’ has existential type variables, a context, or a specialised result type
C1 :: forall a c b. a -> Int -> c -> Foo b a
(Use ExistentialQuantification or GADTs to allow this)
• In the definition of data constructor ‘C1’
In the data type declaration for ‘Foo’
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