error[E0277]: the trait bound `Result<(), MyError>: IntoPyCallbackOutput<_>` is not satisfied
   --> $DIR/invalid_result_conversion.rs:21:1
    |
21  | #[pyfunction]
    | ^^^^^^^^^^^^^ the trait `IntoPyCallbackOutput<_>` is not implemented for `Result<(), MyError>`
    |
   ::: $WORKSPACE/src/callback.rs
    |
    |     T: IntoPyCallbackOutput<U>,
    |        ----------------------- required by this bound in `pyo3::callback::convert`
    |
    = help: the following implementations were found:
              <Result<T, E> as IntoPyCallbackOutput<U>>
    = note: this error originates in the attribute macro `pyfunction` (in Nightly builds, run with -Z macro-backtrace for more info)