operator []= method
Sets the value at the given index in the list to value.
The index must be a valid index of this list,
which means that index must be non-negative and
less than length.
Implementation
@override
void operator []=(int index, Interceptor value) {
if (_list.length == index) {
_list.add(value);
} else {
_list[index] = value;
}
}