void foo(int a) {
  a += 10;
}
/*
OUTPUT:
{
  "includes": [],
  "skipped_ranges": [],
  "usr2func": [{
      "usr": 11998306017310352355,
      "detailed_name": "void foo(int a)",
      "qual_name_offset": 5,
      "short_name": "foo",
      "spell": "1:6-1:9|1:1-3:2|2|-1",
      "bases": [],
      "vars": [10063793875496522529],
      "callees": [],
      "kind": 12,
      "parent_kind": 0,
      "storage": 0,
      "declarations": [],
      "derived": [],
      "uses": []
    }],
  "usr2type": [{
      "usr": 53,
      "detailed_name": "",
      "qual_name_offset": 0,
      "short_name": "",
      "bases": [],
      "funcs": [],
      "types": [],
      "vars": [],
      "alias_of": 0,
      "kind": 0,
      "parent_kind": 0,
      "declarations": [],
      "derived": [],
      "instances": [10063793875496522529],
      "uses": []
    }],
  "usr2var": [{
      "usr": 10063793875496522529,
      "detailed_name": "int a",
      "qual_name_offset": 4,
      "short_name": "a",
      "spell": "1:14-1:15|1:10-1:15|1026|-1",
      "type": 53,
      "kind": 253,
      "parent_kind": 12,
      "storage": 0,
      "declarations": [],
      "uses": ["2:3-2:4|4|-1"]
    }]
}
*/