[Haskell-cafe] Can't explain this error
Jon.Fairbairn at cl.cam.ac.uk
Tue Jul 12 09:08:00 EDT 2005
On 2005-07-12 at 12:39-0000 "Dinh Tien Tuan Anh" wrote:
> i have just encountered another type error.
> This program tries to print out partitions of a positive integer (i guess)
> parts 0 = []
> parts x = [concat (map (y:) parts(x-y) | y<-[1..(x `div` 2)]]
suspicious spacing! That's the same as
> parts x = [concat (map (y:)
| y<-[1..(x `div` 2)]]
ie you are giving map three arguments when it expects two,
which is what the type error says.
Jón Fairbairn Jon.Fairbairn at cl.cam.ac.uk
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