blob: f8fbeff079cf52a10d8aba63d05a31e5104f4c03 (
plain)
1
2
3
4
5
6
7
|
gadtSyntaxFail003.hs:7:5: error:
Data constructor ‘C1’ has existential type variables, a context, or a specialised result type
C1 :: forall b a c. 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’
|