  for(int i : some-container) {
     do-something-with(i);
  }

Where is the mutation?

▲ mrkeen 4 days ago | parent [-]

It's implied by void-returning do-something-with(...).

Otherwise you're just burning cycles and a good compiler should dead-code eliminate the whole loop.

	▲	gpderetta 4 days ago \| parent [-]
		We are discussing mutation in the loop itself, but sure: `for(int x: container) { yield frob(x); }`