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tcfail034.hs:17:13:
Could not deduce (Integral a) arising from a use of ‘mod’
from the context: (Num a, Eq a)
bound by the type signature for: test :: (Num a, Eq a) => a -> Bool
at tcfail034.hs:16:7-32
Possible fix:
add (Integral a) to the context of
the type signature for: test :: (Num a, Eq a) => a -> Bool
In the first argument of ‘(==)’, namely ‘(x `mod` 3)’
In the expression: (x `mod` 3) == 0
In an equation for ‘test’: test x = (x `mod` 3) == 0
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