feature gate deprecated APIs for PyBuffer (#4144)

Author: alex

src/buffer.rs

@@ -18,8 +18,10 @@
 // DEALINGS IN THE SOFTWARE.
 
 //! `PyBuffer` implementation
+use crate::Bound;
+#[cfg(feature = "gil-refs")]
+use crate::PyNativeType;
 use crate::{err, exceptions::PyBufferError, ffi, FromPyObject, PyAny, PyResult, Python};
-use crate::{Bound, PyNativeType};
 use std::marker::PhantomData;
 use std::os::raw;
 use std::pin::Pin;
@@ -190,12 +192,10 @@ impl<'py, T: Element> FromPyObject<'py> for PyBuffer<T> {
 
 impl<T: Element> PyBuffer<T> {
     /// Deprecated form of [`PyBuffer::get_bound`]
-    #[cfg_attr(
-        not(feature = "gil-refs"),
-        deprecated(
-            since = "0.21.0",
-            note = "`PyBuffer::get` will be replaced by `PyBuffer::get_bound` in a future PyO3 version"
-        )
+    #[cfg(feature = "gil-refs")]
+    #[deprecated(
+        since = "0.21.0",
+        note = "`PyBuffer::get` will be replaced by `PyBuffer::get_bound` in a future PyO3 version"
     )]
     pub fn get(obj: &PyAny) -> PyResult<PyBuffer<T>> {
         Self::get_bound(&obj.as_borrowed())