error: cannot specify return type for a function that doesn't return
 --> ui-tests/no-ret-fn-attr.rs:3:40
  |
3 | #[wasm_bindgen(unchecked_return_type = "number")]
  |                                        ^^^^^^^^

error: cannot specify return description for a function that doesn't return
 --> ui-tests/no-ret-fn-attr.rs:6:37
  |
6 | #[wasm_bindgen(return_description = "some description")]
  |                                     ^^^^^^^^^^^^^^^^^^

error: cannot specify return type for a function that doesn't return
  --> ui-tests/no-ret-fn-attr.rs:14:44
   |
14 |     #[wasm_bindgen(unchecked_return_type = "number")]
   |                                            ^^^^^^^^

error: cannot specify return description for a function that doesn't return
  --> ui-tests/no-ret-fn-attr.rs:17:41
   |
17 |     #[wasm_bindgen(return_description = "some description")]
   |                                         ^^^^^^^^^^^^^^^^^^
