[Haskell-beginners] Classes in Polymorphic Constructors

John Smith voldermort at hotmail.com
Mon Aug 23 08:31:42 EDT 2010

Why can polymorphic data constructors not be instantiated as a class? (not sure if I used the right terminology there)

For example,

a = [1,True]::[Show]
b = "foo":a
c = map show b

This would obviate the need for wrapper types

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