Why can't I return a concrete type in a function that has a polymorphic return type?

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Peter Schneider
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Why can't I return a concrete type in a function that has a polymorphic return type?
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(stackoverflow.com/users/7313027/harish-nair)Harish Nair |
(stackoverflow.com/users/67579/willem-van-onsem)Willem Van Onsem |
(stackoverflow.com/users/745903/leftaroundabout)leftaroundabout |
(stackoverflow.com/users/15207568/noughtmare)Noughtmare |
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polymorphism haskell typeclass



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Tags:
polymorphism
haskell
typeclass