void foo(int a) {
  a = 1;
  {
    int a;
    a = 2;
  }
  a = 3;
}

/*
OUTPUT:
{
  "includes": [],
  "skipped_by_preprocessor": [],
  "types": [],
  "funcs": [{
      "id": 0,
      "is_operator": false,
      "usr": "c:@F@foo#I#",
      "short_name": "foo",
      "detailed_name": "void foo(int)",
      "declarations": [],
      "definition_spelling": "1:6-1:9",
      "definition_extent": "1:1-8:2",
      "base": [],
      "derived": [],
      "locals": [],
      "callers": [],
      "callees": []
    }],
  "vars": [{
      "id": 0,
      "usr": "c:var_usage_shadowed_parameter.cc@9@F@foo#I#@a",
      "short_name": "a",
      "detailed_name": "int a",
      "definition_spelling": "1:14-1:15",
      "definition_extent": "1:10-1:15",
      "is_local": true,
      "is_macro": false,
      "is_global": false,
      "is_member": false,
      "uses": ["1:14-1:15", "2:3-2:4", "7:3-7:4"]
    }, {
      "id": 1,
      "usr": "c:var_usage_shadowed_parameter.cc@38@F@foo#I#@a",
      "short_name": "a",
      "detailed_name": "int a",
      "definition_spelling": "4:9-4:10",
      "definition_extent": "4:5-4:10",
      "is_local": true,
      "is_macro": false,
      "is_global": false,
      "is_member": false,
      "uses": ["4:9-4:10", "5:5-5:6"]
    }]
}
*/