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rnfail053.hs:6:10: error: [GHC-25709]
• Data constructor ‘MkT’ has existential type variables, a context, or a specialised result type
MkT :: forall a. a -> T
• In the definition of data constructor ‘MkT’
In the data type declaration for ‘T’
Suggested fixes:
Perhaps you intended to use ExistentialQuantification
Perhaps you intended to use GADTs
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