error[E0277]: the trait bound `pyo3::Python<'_>: Ungil` is not satisfied in `[closure@$DIR/tests/ui/not_send_auto_trait.rs:4:22: 4:24]`
   --> tests/ui/not_send_auto_trait.rs:4:22
    |
4   |     py.allow_threads(|| { drop(py); });
    |        ------------- --^^^^^^^^^^^^^^
    |        |             |
    |        |             within `[closure@$DIR/tests/ui/not_send_auto_trait.rs:4:22: 4:24]`, the trait `Ungil` is not implemented for `pyo3::Python<'_>`
    |        |             within this `[closure@$DIR/tests/ui/not_send_auto_trait.rs:4:22: 4:24]`
    |        required by a bound introduced by this call
    |
    = note: required because it appears within the type `&pyo3::Python<'_>`
note: required because it's used within this closure
   --> tests/ui/not_send_auto_trait.rs:4:22
    |
4   |     py.allow_threads(|| { drop(py); });
    |                      ^^
note: required by a bound in `pyo3::Python::<'py>::allow_threads`
   --> src/marker.rs
    |
    |         F: Ungil + FnOnce() -> T,
    |            ^^^^^ required by this bound in `pyo3::Python::<'py>::allow_threads`