namespace ns {
  int Foo;
  void Accept(int a) {}
}

void Runner() {
  ns::Accept(ns::Foo);
  using namespace ns;
  Accept(Foo);
}

/*
OUTPUT:
{
  "types": [],
  "functions": [{
      "id": 0,
      "usr": "c:@N@ns@F@Accept#I#",
      "short_name": "Accept",
      "qualified_name": "ns::Accept",
      "definition": "1:3:8",
      "callers": ["1@1:7:7", "1@1:9:3"],
      "uses": ["1:3:8", "1:7:7", "1:9:3"]
    }, {
      "id": 1,
      "usr": "c:@F@Runner#",
      "short_name": "Runner",
      "qualified_name": "Runner",
      "definition": "1:6:6",
      "callees": ["0@1:7:7", "0@1:9:3"],
      "uses": ["1:6:6"]
    }],
  "variables": [{
      "id": 0,
      "usr": "c:@N@ns@Foo",
      "short_name": "Foo",
      "qualified_name": "ns::Foo",
      "definition": "1:2:7",
      "uses": ["1:2:7", "1:7:18", "1:9:10"]
    }, {
      "id": 1,
      "usr": "c:namespace_reference.cc@42@N@ns@F@Accept#I#@a",
      "short_name": "a",
      "qualified_name": "a",
      "definition": "1:3:19",
      "uses": ["1:3:19"]
    }]
}
*/