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Illegal instance declaration for `MyClass (HashTable String String)'
(The instance type must be of form (T a b c)
where T is not a synonym, and a,b,c are distinct type variables)
In the instance declaration for `MyClass (HashTable String String)'
even though the documentation in GHC states that HashTable is
declared as "data".
(Guessing) Maybe because 'String' is not a type variable?
*Exactly* because of that.
Cheers,
Stefan
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