Source
@override
Set<String> get features {
Set<String> all_features = super.features;
/// final/const implies read-only, so don't display both strings.
if (readOnly && !isFinal && !isConst) all_features.add('read-only');
if (writeOnly) all_features.add('write-only');
if (readWrite) all_features.add('read / write');
return all_features;
}