2
Variable not in scope

For every piece of code that I wrote, I get ''variable not in scope''. (for example :
length1 :: [a] -> Int
length1 l | l==[] =0
| otherwise = 1 + length1 tail l
)
some of the other solutions i tried are written by my teaher.

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1

@sara_n It looks like duzina doesn't exist. Did you mean to say length? Also you're adding duzina to 1 in that code. You need to define a main function too.