Fix Set iand operation bug

kth496 · kth496 · commit ada0063895c9 · 2022-07-18T10:03:41.000+09:00
diff --git a/vm/src/builtins/set.rs b/vm/src/builtins/set.rs
@@ -658,7 +658,11 @@ impl PySet {
     }
 
     #[pymethod(magic)]
-    fn iand(zelf: PyRef<Self>, set: AnySet, vm: &VirtualMachine) -> PyResult<PyRef<Self>> {
+    fn iand(zelf: PyRef<Self>, set: PyObjectRef, vm: &VirtualMachine) -> PyResult<PyRef<Self>> {
+        if zelf.get_id() == set.get_id() {
+            return Ok(zelf);
+        }
+        let set = set.try_into_value::<AnySet>(vm)?;
         zelf.inner
             .intersection_update(std::iter::once(set.into_iterable(vm)?), vm)?;
         Ok(zelf)
