Where to find chunks in haskell? -

i'm trying follow tutorial: https://wiki.haskell.org/tutorials/programming_haskell/string_io.

in last part 7 extension: using smp parallelism copy code fails compile error message

/home/dhilst/parallelspell.hs:13:20: error:     variable not in scope: chunk :: int -> [string] -> t 

i searched chunks @ hoogle , got data.text.internal.lazy, seems internal module. , couldn't import anyway.

here code:

import data.set hiding (map) import data.maybe import data.char import text.printf import system.io import system.environment import control.concurrent import control.monad  main =         (f,g,n) <- readfiles         let dict = fromlist (lines f)             work = chunk n (words g)         run n dict work  run n dict work =         chan <- newchan         errs <- getchancontents chan         mapm_ (forkio . thread chan dict) (zip [1..n] work)         wait n errs 0   wait n xs = when (i < n) $ case xs of         nothing : ys -> wait n ys $! i+1         s  : ys -> putstrln s >> wait n ys  thread chan dict (me,xs) =         mapm_ spellit xs         writechan chan nothing         spellit w = when (spell dict w) $                 writechan chan . $ printf "thread %d: %-25s" (me::int) w  spell d w = w `notmember` d  readfiles =         [s,n] <- getargs         f <- readfile "/usr/share/dict/words"         g <- readfile s         return (f,g, read n) 

and here compilation line:

ghc -o --make -threaded parallelspell.hs 

-- update: write own version of chunk based on quest:how partition list in haskell?

chunk :: int -> [a] -> [[a]] chunk _ [] = [] chunk n xs = (take n xs) : (chunk n (drop n xs)) 

still, means tutorial i'm following old , out of date!? can confirm if function existed day or if i'm missing something?

regards,

looks tutorial forgot define chunk. encourage update wiki include suitable definition.