extern int global;
/*
OUTPUT:
{
  "types": [],
  "functions": [],
  "variables": [{
      "id": 0,
      "short_name": "global",
      "qualified_name": "global",
      "declaration": "tests/vars/global_variable_decl_only.cc:1:12",
      "initializations": [],
      "variable_type": null,
      "declaring_type": null,
      "uses": []
    }]
}
*/