[bsummer4]

You can't write this in Haskell:

  print(arr[i])

You can write this, but you probably wouldn't.

  print (arr `V.unsafeIndex` i)

[dllthomas]

Unfortunately, unsafeIndex is often spelled "!". There is a push (which I support!) away from partial functions, but there are still plenty of partial functions provided by standard libraries under names that sound reasonable.