Variable not in scope
sara_n (2)

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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sara_n (2)

@ThatSmart what should i do then? the function returns an integer and i can add 1 to that integer and get the integer i need