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If I use the + operator, Haskell automatically infers the type class Num:
> let add x y = x + y
> :t add
add :: Num a => a -> a -> a
Does this mean I cannot have multiple type classes with a + operator?
You can’t have multiple type classes defining
+in the same module (the same applies to any other function name of course – not just+).And if you import multiple modules which define
+(whether it be as part of a typeclass or not), you either need to hide+when importing all but one of them, import all but one of them as qualified or always refer to+qualified.