error[E0599]: no method named `assert_into_py_result` found for enum `Result` in the current scope
  --> tests/ui/invalid_result_conversion.rs:21:1
   |
21 | #[pyfunction]
   | ^^^^^^^^^^^^^ method not found in `Result<(), MyError>`
   |
   = note: this error originates in the attribute macro `pyfunction` (in Nightly builds, run with -Z macro-backtrace for more info)

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