public SimpleVariableDef parseSimpleVariableDef_DefIdOptional() {
ParseHelper parse = new ParseHelper(-1);
TypeId_or_Id_RuleFragment typeRef_defId = new TypeId_or_Type_RuleFragment();
typeRef_defId.parseRuleFragment(parse, true);
return parse.conclude(new SimpleVariableDef(typeRef_defId.type, typeRef_defId.defId));
}