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T6001.hs:8:18: error:
• Couldn't match type ‘Int’ with ‘Integer’
Expected: Integer -> DayKind
Actual: Int -> DayKind
• When checking that instance signature for ‘fromInteger’
is more general than its signature in the class
Instance sig: Int -> DayKind
Class sig: Integer -> DayKind
In the instance declaration for ‘Num DayKind’
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