[Haskell-beginners] Non-exhaustive patterns in function error

[Galaxy Being]

How embarrassing...

intersect1 :: (Eq a) => ([a],[a]) -> [a]


On Thu, Feb 25, 2021 at 5:53 PM Bob Ippolito <bob at redivi.com> wrote:

> It's the typo. Note that you'll also need an Eq a typeclass constraint for
> this type signature to be correct (which is the next error you'd get)
>
> -- underscores for emphasis
> inter_se_ct1
> inter_es_ct1
>
>
> On Thu, Feb 25, 2021 at 3:24 PM Galaxy Being <borgauf at gmail.com> wrote:
>
>> I have this
>>
>> intersect1 :: ([a],[a]) -> [a]
>> intersect1 (s,[])              = []
>> interesct1 (s,t:ts) | elem t s = t : intersect1 (s,ts)
>>                     | otherwise = intersect1 (s,ts)
>>
>> and when I try this
>>
>> intersect1 ([1,2],[1,2,3])
>>
>> I get the error
>>
>>  Non-exhaustive patterns in function intersect1
>>
>> Not sure what's wrong with this.
>>
>> LB
>>
>>
>> _______________________________________________
>> Beginners mailing list
>> Beginners at haskell.org
>> http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
>>
> _______________________________________________
> Beginners mailing list
> Beginners at haskell.org
> http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.haskell.org/pipermail/beginners/attachments/20210225/f7c145b7/attachment.html>