We have and error of infinite type for Prelude> :t ((\(h:t) -> h t) [head, last, head, last, head, last])
Of course, head and tail are incompatible on type level...
It seems like you need heterogenous collections[0]
Well the error pops up much earlier than that, see: Prelude> :t (\(h:t) -> h t)
Regards, Henk-Jan van Tuyl
[0] http://www.haskell.org/haskellwiki/Heterogenous_collections
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