Fix examples with the new #[new] API

examples/rustapi_module/src/buf_and_str.rs

@@ -9,8 +9,8 @@ struct BytesExtractor {}
 #[pymethods]
 impl BytesExtractor {
     #[new]
-    pub fn __new__(obj: &PyRawObject) {
-        obj.init({ BytesExtractor {} });
+    pub fn __new__() -> Self {
+        BytesExtractor {}
     }
 
     pub fn from_bytes(&mut self, bytes: &PyBytes) -> PyResult<usize> {

examples/rustapi_module/src/datetime.rs

@@ -195,8 +195,8 @@ pub struct TzClass {}
 #[pymethods]
 impl TzClass {
     #[new]
-    fn new(obj: &PyRawObject) {
-        obj.init(TzClass {})
+    fn new() -> Self {
+        TzClass {}
     }
 
     fn utcoffset<'p>(&self, py: Python<'p>, _dt: &PyDateTime) -> PyResult<&'p PyDelta> {

examples/rustapi_module/src/dict_iter.rs

@@ -16,8 +16,8 @@ pub struct DictSize {
 #[pymethods]
 impl DictSize {
     #[new]
-    fn new(obj: &PyRawObject, expected: u32) {
-        obj.init(DictSize { expected })
+    fn new(expected: u32) -> Self {
+        DictSize { expected }
     }
 
     fn iter_dict(&mut self, _py: Python<'_>, dict: &PyDict) -> PyResult<u32> {

examples/rustapi_module/src/othermod.rs

@@ -13,10 +13,10 @@ pub struct ModClass {
 #[pymethods]
 impl ModClass {
     #[new]
-    fn new(obj: &PyRawObject) {
-        obj.init(ModClass {
+    fn new() -> Self {
+        ModClass {
             _somefield: String::from("contents"),
-        })
+        }
     }
 
     fn noop(&self, x: usize) -> usize {

examples/rustapi_module/src/subclassing.rs

@@ -8,8 +8,8 @@ pub struct Subclassable {}
 #[pymethods]
 impl Subclassable {
     #[new]
-    fn new(obj: &PyRawObject) {
-        obj.init(Subclassable {});
+    fn new() -> Self {
+        Subclassable {}
     }
 }
 

examples/word-count/src/lib.rs

@@ -16,10 +16,10 @@ struct WordCounter {
 #[pymethods]
 impl WordCounter {
     #[new]
-    fn new(obj: &PyRawObject, path: String) {
-        obj.init(WordCounter {
+    fn new(path: String) -> Self {
+        WordCounter {
             path: PathBuf::from(path),
-        });
+        }
     }
 
     /// Searches for the word, parallelized by rayon

src/types/datetime.rs

@@ -318,8 +318,9 @@ impl PyTimeAccess for PyTime {
 ///
 /// This is an abstract base class and should not be constructed directly.
 pub struct PyTzInfo(PyObject, Unsendable);
-pyobject_native_var_type!(
+pyobject_native_type!(
     PyTzInfo,
+    crate::ffi::PyObject,
     *PyDateTimeAPI.TZInfoType,
     Some("datetime"),
     PyTZInfo_Check