[Haskell-beginners] Are these soloutions all valid and a good use of Haskell
Alex Hammel
ahammel87 at gmail.com
Mon Nov 10 21:47:05 UTC 2014
It's an indentation issue. Make sure that there are no spaces before the
bit about 'last5 = foldr acc' etc.
On Mon, Nov 10, 2014 at 12:48 PM, Roelof Wobben <r.wobben at home.nl> wrote:
> Roelof Wobben schreef op 10-11-2014 20:59:
>
>> last5 :: [a] -> Maybe a
>> last5 = foldr acc Nothing where
>> acc x Nothing = Just x
>> acc _ j = j
>>
>
> When I enter this in GHCI I see this error :
>
> Illegal type signature: ‘[a] -> Maybe a last5’
>
>
>
>
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