[Haskell-beginners] infinite type

[Imants Cekusins]

>Where does the infinity come from?

Here is composition signature:

(.) <http://hackage.haskell.org/package/base-4.8.1.0/docs/Prelude.html#v:.> ::
(b -> c) -> (a -> b) -> a -> c

It looks like it is applicable to functions with 1 arg. Sum expects 2 args.
I guess this explains why sum can not be passed to f
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