ci: lint fixes for rust 1.78 (#1289)

src/errors/types.rs

@@ -56,15 +56,12 @@ fn field_from_context<'py, T: FromPyObject<'py>>(
         .map_err(|_| py_error_type!(PyTypeError; "{}: '{}' context value must be a {}", enum_name, field_name, type_name_fn()))
 }
 
-fn cow_field_from_context<'py, T: FromPyObject<'py>, B: ?Sized + 'static>(
+fn cow_field_from_context<'py, T: FromPyObject<'py>, B: ToOwned<Owned = T> + ?Sized + 'static>(
     context: Option<&Bound<'py, PyDict>>,
     field_name: &str,
     enum_name: &str,
     _type_name_fn: fn() -> &'static str,
-) -> PyResult<Cow<'static, B>>
-where
-    B: ToOwned<Owned = T>,
-{
+) -> PyResult<Cow<'static, B>> {
     let res: T = field_from_context(context, field_name, enum_name, || {
         type_name::<T>().split("::").last().unwrap()
     })?;

src/serializers/ser.rs

@@ -236,23 +236,17 @@ where
         self.serialize_str(variant)
     }
 
-    fn serialize_newtype_struct<T: ?Sized>(self, _name: &'static str, value: &T) -> Result<Self::Ok>
-    where
-        T: Serialize,
-    {
+    fn serialize_newtype_struct<T: Serialize + ?Sized>(self, _name: &'static str, value: &T) -> Result<Self::Ok> {
         value.serialize(self)
     }
 
-    fn serialize_newtype_variant<T: ?Sized>(
+    fn serialize_newtype_variant<T: Serialize + ?Sized>(
         self,
         _name: &'static str,
         _variant_index: u32,
         variant: &'static str,
         value: &T,
-    ) -> Result<Self::Ok>
-    where
-        T: Serialize,
-    {
+    ) -> Result<Self::Ok> {
         tri!(self
             .formatter
             .begin_object(&mut self.writer)