Is it possible to do it or it would provide inconsistency in language?
I mean something like:
int[] my_ints = new int[1024] on stack;
->
int my_ints[1024];

or even (via calloc):
int[] my_ints = new int[my_function ()] on stack;
->
int my_ints_length = my_function ();
int *my_ints = (int *)alloca (my_ints_length);

It should improve the locality of code.