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 trait `IntoPyCallbackOutput` is implemented for `Result` note: required by a bound in `pyo3::callback::convert` --> src/callback.rs | | T: IntoPyCallbackOutput, | ^^^^^^^^^^^^^^^^^^^^^^^ 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)