The type of the cons operator (:) is (:) :: a -> [a] -> [a] The way you are invoking it expects it to have the type (:) :: a -> Maybe [a] -> [a] -- not valid One solution is to write such a function yourself, while the other would be to rewrite your code to invoke it correctly. On 12 May 2015 at 19:46, Brandon Allbery <allbery.b@gmail.com> wrote:
On Tue, May 12, 2015 at 10:11 AM, Roelof Wobben <r.wobben@home.nl> wrote:
I do not understand what you are saying to me.
I know that init produces a Maybe [a] . That is why I did put a Just before it.
You are invoking it again though, and using its result as if it produces [a] instead of Maybe [a].
-- brandon s allbery kf8nh sine nomine associates allbery.b@gmail.com ballbery@sinenomine.net unix, openafs, kerberos, infrastructure, xmonad http://sinenomine.net
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