Re: [Haskell-cafe] Can't explain this error

oh damn, thank you

From: Jon Fairbairn To: "Dinh Tien Tuan Anh" CC: robdockins@fastmail.fm, haskell-cafe@haskell.org Subject: Re: [Haskell-cafe] Can't explain this error Date: Tue, 12 Jul 2005 14:08:00 +0100

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:) parts (x-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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