[Haskell-beginners] haddock parse error

[Nikita Danilenko]

Hi,

I believe, the module containing the function summation needs a header.
If I add a header, the parse error disappears. This problem may be
explained by [1], where the description probably implies that there is a
module header.

I hope that helps,

Nikita

[1] http://www.haskell.org/haddock/doc/html/ch03s03.html

On 19/03/13 07:41, Christopher Howard wrote:
> Hi. I tried to run haddock on a file with this content:
>
> code:
> --------
> {-|
>   The 'summation' function provides the same function as summation or sigma
>   notation. The first argument the starting index number. The second
> argument
>   is the ending index number. The third argument is a function representing
>   the formula for each term.
>  -}
> summation :: (Eq a, Num a1, Num a) => a -> a -> (a -> a1) -> a1
> summation i n f | i == n = f i
>                 | otherwise = f i + summation (i + 1) n f
>
> ...snip...
> --------
>
> And I get
>
> quote:
> --------
> $ haddock summation.hs
>
> summation.hs:7:1: parse error on input `summation'
> --------
>
> What is wrong with it? (The code runs fine with GHC.)
>
> $ haddock --version
> Haddock version 2.10.0, (c) Simon Marlow 2006
> Ported to use the GHC API by David Waern 2006-2008
>
> $ ghc --version
> The Glorious Glasgow Haskell Compilation System, version 7.4.1
>
>
>
>
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