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gadtSyntaxFail003.hs:8:5: error: [GHC-25709]
• 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
• In the definition of data constructor ‘C1’
In the data type declaration for ‘Foo’
Suggested fixes:
Perhaps you intended to use ExistentialQuantification
Perhaps you intended to use GADTs
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