extern int global;
/*
OUTPUT:
{
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  "usr2func": [],
  "usr2type": [{
      "usr": 53,
      "detailed_name": "",
      "qual_name_offset": 0,
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      "types": [],
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      "alias_of": 0,
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      "declarations": [],
      "derived": [],
      "instances": [9937941849651546906],
      "uses": []
    }],
  "usr2var": [{
      "usr": 9937941849651546906,
      "detailed_name": "extern int global",
      "qual_name_offset": 11,
      "short_name": "global",
      "type": 53,
      "kind": 13,
      "parent_kind": 0,
      "storage": 1,
      "declarations": ["1:12-1:18|1:1-1:18|1|-1"],
      "uses": []
    }]
}
*/