Useful alternative control structures?

Question

Sometimes when I am programming, I find that some particular control structure would be very useful to me, but is not directly available in my programming language. I think my

Answer 1

Something that replaces

bool found = false;
for (int i = 0; i < N; i++) {
  if (hasProperty(A[i])) {
    found = true;
    DoSomething(A[i]);
    break;
  }
}
if (!found) {
  ...
}

like

for (int i = 0; i < N; i++) {
  if (hasProperty(A[i])) {
    DoSomething(A[i]);
    break;
  }
} ifnotinterrupted {
  ...
}

I always feel that there must be a better way than introducing a flag just to execute something after the last (regular) execution of the loop body. One could check !(i < N), but i is out of scope after the loop.