error[E0277]: the trait bound `PyErr: From<MyError>` is not satisfied
  --> tests/ui/invalid_result_conversion.rs:22:25
   |
22 | fn should_not_work() -> Result<(), MyError> {
   |                         ^^^^^^ the trait `From<MyError>` is not implemented for `PyErr`, which is required by `MyError: Into<PyErr>`
   |
   = help: the following other types implement trait `From<T>`:
             <PyErr as From<AddrParseError>>
             <PyErr as From<DecodeUtf16Error>>
             <PyErr as From<DowncastError<'_, '_>>>
             <PyErr as From<DowncastIntoError<'_>>>
             <PyErr as From<FromUtf16Error>>
             <PyErr as From<FromUtf8Error>>
             <PyErr as From<Infallible>>
             <PyErr as From<IntoInnerError<W>>>
           and $N others
   = note: required for `MyError` to implement `Into<PyErr>`