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T1133A.hs:7:28: error:
• Can't make a derived instance of ‘Enum X’:
‘X’ must be an enumeration type
(an enumeration consists of one or more nullary, non-GADT constructors)
• In the newtype declaration for ‘X’
Suggested fix:
Perhaps you intended to use GeneralizedNewtypeDeriving
for GHC's newtype-deriving extension
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