void main() {
  int a[5];
  for (int i = 0; i < 5; i++) {
    a[i] = i;
  }
  $assert(!!!$exists (int k:0..4) a[k]<0);
  $assert($exists (int k:0..4) a[k]==2);
  $assert(3!=5 && $exists (int k:0..4) a[k]==2);
  $assert($exists (int i,j) a[i]==2 && a[j]==3); // OK
  $assert($exists (int i:0..4; int j:0..4) a[i]==2 && a[j]==3); // OK
  // note the following syntax is not supported. a little non-intuitive:
  //$assert($exists (int i,j:0..4) a[i]==2 && a[j]==3);
  // this is also "not yet implemented":
  //$assert($exists (int i,j:($domain){0..4,0..4}) a[i]==2 && a[j]==3);
}