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tcfail042.hs:15:10:
Could not deduce (Num a)
arising from the superclasses of an instance declaration
from the context (Eq a, Show a)
bound by the instance declaration at tcfail042.hs:15:10-34
Possible fix:
add (Num a) to the context of the instance declaration
In the instance declaration for ‘Bar [a]’
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