I am trying to define a containing function to see if a value is one
of the elements within a list which is polymorphic, but failed with the
following codes:
> contain :: a -> [a] -> Bool
> contain x [] = False
> contain x (y:ys) = if x == y then True else contain x ys
it seems that the problem is the 'operator' == does not support a polymorphic
check?
Any way can solve the problem? or any alternative solution to achieve the
purpose?
Thanks!
Raeck
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