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tcfail117.hs:6:32: error: [GHC-30750]
• 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)
• In the newtype declaration for ‘N1’
Suggested fix:
Perhaps you intended to use GeneralizedNewtypeDeriving
for GHC's newtype-deriving extension
tcfail117.hs:7:32: error: [GHC-30750]
• 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 declaration for ‘N2’
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