Did you know dep. type languages can have

mutable arrays? I didn't until today:

http://cs.ru.nl/~wouters/Publications/MoreDepTypesForDistrArrays.pdf

No out of bounds exceptions, and you can prove shit like the idempotence of a swap operation repeated twice on the same pair of array elements. Good stuff.

C has mutable arrays too.
Haskal has mutable arrays too.
Even Ada/SPARK has mutable arrays.