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

[Brody Berg]

Don’t worry about it. We’ve all been there.

On Thu, Feb 25, 2021 at 18:01 Galaxy Being <borgauf at gmail.com> wrote:

> 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
>>>
>>>
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