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