My code looks like this:
threeByThree :: Sudoku -> [Block]
threeByThree sudoku = (chunksOf 9(concat(transpose(take 3 (rows sudoku)))++
(transpose(take 3 rs))++(transpose xs)))
where
rs <- drop 3 (rows sudoku)
xs <- drop 3 rs
The error message I'm receiving:
Sudoku.hs:130:12: parse error on input `<-'
Which should be exactly at the first arrow. Am I missing the obvious here?
Probably you meant:
where
rs = drop 3 (rows sudoku)
xs = drop 3 rs
Note that <- has got a different meaning. It is used in the context of Monad desugaring.
@Sibi has the correct answer to your specific problem. I just wanted to briefly mention that this error usually means that you forgot to put do at the beginning of a do block:
-- Parse error on input `<-'
example1 =
x <- m
y <- n
-- How to fix the error:
example2 = do
x <- m
y <- n
