I find myself doing the following sometimes:

  T[] array = <something>;
  if(<whatever) {
    Process(array[0]);
    array = array[1..length];
  }

Which made me think that a slice-assign operator would make a lot of sense; it would be a good parallel with += *= and the rest.  What I imagined was something like:
  array =[1..length];

Which isn't 100% consistent with the others, of course, since the operator comes AFTER the =, but it's close.

Thoughts?