Does it help if you format it like this:
-- |Apply a given function over all elements of a list and select one of the
-- results.
selector :: (Arbitrary b)
=> [a] -- ^ Elements to select from
-> (a -> b) -- ^ Constructor to apply to selected element
-> Gen b
selector list ctor = oneof (map (return . ctor) list)
So placing the => and -> before the lines instead of after them?
2011/8/25 Arnaud Bailly <arnaud.oq...@gmail.com>:
> Hello,
> while trying to generate Haddock documentation (Haddock version 2.9.2, (c)
> Simon Marlow 2006), it chokes on the following fragment
>
> -- |Apply a given function over all elements of a list and select one of the
> -- results.
> selector :: (Arbitrary b) =>
> [a] -> -- ^ Elements to select from
> (a -> b) -> -- ^ Constructor to apply to selected element
> Gen b
> selector list ctor = oneof (map (return . ctor) list)
>
> with the following error message:
>
> ' parse error on input `-- ^ Elements to select from
>
> I am puzzled as this is exactly how arguments are supposed to be documented,
> according to http://www.haskell.org/haddock/doc/html/ch03s02.html#id565220
>
> Any clues ?
>
> Arnaud
>
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>
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