error: Unknown option 'invalid_opt'.

       Valid options:
       - headers: { "Name": "value" }  - Request headers
       - json: { "key": value }         - JSON body (sets Content-Type)
       - body: expression                   - Raw body bytes
       - timeout: milliseconds              - Request timeout

       Example:
       fetch!(POST "https://api.example.com",
       headers: { "Authorization": "Bearer token" },
       json: { "name": "Alice" },
       timeout: 5000
       )
 --> tests/ui/fetch/unknown_option.rs:5:50
  |
5 |     let _req = fetch!(GET "https://example.com", invalid_opt: true);
  |                                                  ^^^^^^^^^^^
