[Haskell-beginners] print []

[Lukas Lehner]

Hello,

This code runs ok http://lpaste.net/91814 but only thanks to enforcing [()]
on line 12.

In GHCI
*Main> :t (List [])
(List []) :: NestedList a

and

*Main> :t flatten (List [])
flatten (List []) :: [a]

That means ghc cannot infer the type.
Is there a way how to # print flatten (List []) ?
Or even more general, print [] without enforcing the type?


Thank you
Lukas
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