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gadtSyntaxFail001.hs:8:5:
Data constructor ‛C2’ has existential type variables, a context, or a specialised result type
C2 :: forall a. a -> Char -> Foo a Int
(Use -XExistentialQuantification or -XGADTs to allow this)
In the definition of data constructor ‛C2’
In the data declaration for ‛Foo’
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