ccls/tests/function_declaration.cc

void foo(int a, int b);

/*
OUTPUT:
{
  "funcs": [{
      "id": 0,
      "usr": "c:@F@foo#I#I#",
      "short_name": "foo",
      "qualified_name": "foo",
      "declarations": ["1:6-1:9"],
      "uses": ["1:6-1:9"]
    }]
}
*/