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mod47.hs:6:10: error:
• Could not deduce ‘Num a’
arising from the superclasses of an instance declaration
from the context: (Eq a, Enum a)
bound by the instance declaration at mod47.hs:6:10-34
Possible fix:
add (Num a) to the context of the instance declaration
• In the instance declaration for ‘Bar [a]’
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