void foo(int, int) {}
/*
OUTPUT:
{
  "includes": [],
  "skipped_by_preprocessor": [],
  "usr2func": [{
      "usr": 2747674671862363334,
      "detailed_name": "void foo(int, int)",
      "qual_name_offset": 5,
      "short_name": "foo",
      "kind": 12,
      "storage": 1,
      "declarations": [],
      "spell": "1:6-1:9|0|1|2",
      "extent": "1:1-1:22|0|1|0",
      "declaring_type": 0,
      "bases": [],
      "derived": [],
      "vars": [],
      "uses": [],
      "callees": []
    }],
  "usr2type": [],
  "usr2var": []
}
*/