class Root {
  virtual void foo();
};
class Derived : public Root {
  void foo() override {}
};

/*
OUTPUT:
{
  "includes": [],
  "skipped_by_preprocessor": [],
  "types": [{
      "id": 0,
      "usr": "c:@S@Root",
      "short_name": "Root",
      "detailed_name": "Root",
      "hover": "Root",
      "definition_spelling": "1:7-1:11",
      "definition_extent": "1:1-3:2",
      "parents": [],
      "derived": [1],
      "types": [],
      "funcs": [0],
      "vars": [],
      "instances": [],
      "uses": ["1:7-1:11", "4:24-4:28"]
    }, {
      "id": 1,
      "usr": "c:@S@Derived",
      "short_name": "Derived",
      "detailed_name": "Derived",
      "hover": "Derived",
      "definition_spelling": "4:7-4:14",
      "definition_extent": "4:1-6:2",
      "parents": [0],
      "derived": [],
      "types": [],
      "funcs": [1],
      "vars": [],
      "instances": [],
      "uses": ["4:7-4:14"]
    }],
  "funcs": [{
      "id": 0,
      "is_operator": false,
      "usr": "c:@S@Root@F@foo#",
      "short_name": "foo",
      "detailed_name": "void Root::foo()",
      "hover": "void Root::foo()",
      "declarations": [{
          "spelling": "2:16-2:19",
          "extent": "2:3-2:21",
          "content": "virtual void foo()",
          "param_spellings": []
        }],
      "declaring_type": 0,
      "derived": [1],
      "locals": [],
      "callers": [],
      "callees": []
    }, {
      "id": 1,
      "is_operator": false,
      "usr": "c:@S@Derived@F@foo#",
      "short_name": "foo",
      "detailed_name": "void Derived::foo()",
      "hover": "void Derived::foo()",
      "declarations": [],
      "definition_spelling": "5:8-5:11",
      "definition_extent": "5:3-5:25",
      "declaring_type": 1,
      "base": 0,
      "derived": [],
      "locals": [],
      "callers": [],
      "callees": []
    }],
  "vars": []
}
*/