Overwrites objects of this with the objects of iterable, starting
at position index in this list.
List<String> list = ['a', 'b', 'c'];
list.setAll(1, ['bee', 'sea']);
list.join(', '); // 'a, bee, sea'
This operation does not increase the length of this.
The index must be non-negative and no greater than length.
The iterable must not have more elements than what can fit from index
to length.
If iterable is based on this list, its values may change /during/ the
setAll operation.
Source
void setAll(int index, Iterable<E> iterable) {
throw new UnsupportedError("Cannot modify an immutable List.");
}