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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]’
tcfail042.hs:17:18:
Could not deduce (Num a) arising from a use of ‘foo’
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 expression: foo xs
In an equation for ‘bar’:
bar (x : xs)
= foo xs
where
u = x == x
v = show x
In the instance declaration for ‘Bar [a]’
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