error[E0277]: the trait bound `std::result::Result<(), MyError>: pyo3::callback::IntoPyCallbackOutput<_>` is not satisfied
   --> $DIR/invalid_result_conversion.rs:22:1
    |
22  | #[pyfunction]
    | ^^^^^^^^^^^^^ the trait `pyo3::callback::IntoPyCallbackOutput<_>` is not implemented for `std::result::Result<(), MyError>`
    |
   ::: $WORKSPACE/src/callback.rs:170:8
    |
170 |     T: IntoPyCallbackOutput<U>,
    |        ----------------------- required by this bound in `pyo3::callback::convert`
    |
    = help: the following implementations were found:
              <std::result::Result<T, E> as pyo3::callback::IntoPyCallbackOutput<U>>
    = note: this error originates in an attribute macro (in Nightly builds, run with -Z macro-backtrace for more info)