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<interactive>:5:1:
Illegal generalised algebraic data declaration for ‛T’
(Use -XGADTs to allow GADTs)
In the data declaration for ‛T’
ghci057.hs:3:3:
Data constructor ‛C’ has existential type variables, a context, or a specialised result type
C :: T Int
(Use -XExistentialQuantification or -XGADTs to allow this)
In the definition of data constructor ‛C’
In the data declaration for ‛T’
ghci057.hs:3:3:
Data constructor ‛C’ has existential type variables, a context, or a specialised result type
C :: T Int
(Use -XExistentialQuantification or -XGADTs to allow this)
In the definition of data constructor ‛C’
In the data declaration for ‛T’
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