makeUnassignable method
Makes it so that this signal cannot be assigned by any full (<=) or
conditional (<) assignment.
Optionally, a reason may be provided for why it cannot be assigned. If a
prior reason had been provided, this will overwrite it.
Implementation
@override
void makeUnassignable({String? reason}) {
for (final element in elements) {
element.makeUnassignable(reason: reason);
}
}