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tcfail117.hs:5:32:
Can't make a derived instance of `Enum N1':
`N1' must be an enumeration type
(an enumeration consists of one or more nullary, non-GADT constructors)
Try -XGeneralizedNewtypeDeriving for GHC's newtype-deriving extension
In the newtype declaration for `N1'
tcfail117.hs:6:32:
Can't make a derived instance of `Enum N2':
`N2' must be an enumeration type
(an enumeration consists of one or more nullary, non-GADT constructors)
In the data type declaration for `N2'
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