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

[Bob Ippolito]

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
>
>
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