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

Don’t worry about it. We’ve all been there. On Thu, Feb 25, 2021 at 18:01 Galaxy Being wrote:

How embarrassing...

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

On Thu, Feb 25, 2021 at 5:53 PM Bob Ippolito 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 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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