Make property.__get__ owner parameter optional

tests/snippets/property.py

@@ -51,8 +51,7 @@ assert type(null_property) is property
 
 p = property(lambda x: x[0])
 assert p.__get__((2,), tuple) == 2
-# TODO owner parameter is optional
-# assert p.__get__((2,)) == 2
+assert p.__get__((2,)) == 2
 
 with assertRaises(AttributeError):
     null_property.__get__((), tuple)

vm/src/obj/objproperty.rs

@@ -24,7 +24,12 @@ impl PyValue for PyReadOnlyProperty {
 pub type PyReadOnlyPropertyRef = PyRef<PyReadOnlyProperty>;
 
 impl PyReadOnlyPropertyRef {
-    fn get(self, obj: PyObjectRef, _owner: PyClassRef, vm: &mut VirtualMachine) -> PyResult {
+    fn get(
+        self,
+        obj: PyObjectRef,
+        _owner: OptionalArg<PyClassRef>,
+        vm: &mut VirtualMachine,
+    ) -> PyResult {
         if obj.is(&vm.ctx.none) {
             Ok(self.into_object())
         } else {
@@ -81,7 +86,12 @@ impl PyPropertyRef {
         }
     }
 
-    fn get(self, obj: PyObjectRef, _owner: PyClassRef, vm: &mut VirtualMachine) -> PyResult {
+    fn get(
+        self,
+        obj: PyObjectRef,
+        _owner: OptionalArg<PyClassRef>,
+        vm: &mut VirtualMachine,
+    ) -> PyResult {
         if let Some(getter) = self.getter.as_ref() {
             if obj.is(&vm.ctx.none) {
                 Ok(self.into_object())