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<interactive>:4:1: error:
Illegal generalised algebraic data declaration for ‘T’
(Use GADTs to allow GADTs)
In the data declaration for ‘T’
ghci057.hs:3:3: error:
Data constructor ‘C’ has existential type variables, a context, or a specialised result type
C :: T Int
(Use ExistentialQuantification or GADTs to allow this)
In the definition of data constructor ‘C’
In the data type declaration for ‘T’
ghci057.hs:3:3: error:
Data constructor ‘C’ has existential type variables, a context, or a specialised result type
C :: T Int
(Use ExistentialQuantification or GADTs to allow this)
In the definition of data constructor ‘C’
In the data type declaration for ‘T’
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