avm2: Support Error 1089

core/src/avm2/error.rs

@@ -200,6 +200,20 @@ pub fn make_error_1087<'gc>(activation: &mut Activation<'_, 'gc>) -> Error<'gc>
     }
 }
 
+#[inline(never)]
+#[cold]
+pub fn make_error_1089<'gc>(activation: &mut Activation<'_, 'gc>) -> Error<'gc> {
+    let err = type_error(
+        activation,
+        "Error #1089: Assignment to lists with more than one item is not supported.",
+        1089,
+    );
+    match err {
+        Ok(err) => Error::AvmError(err),
+        Err(err) => err,
+    }
+}
+
 #[inline(never)]
 #[cold]
 pub fn make_error_1118<'gc>(activation: &mut Activation<'_, 'gc>) -> Error<'gc> {

core/src/avm2/object/xml_list_object.rs

@@ -1,5 +1,6 @@
 use crate::avm2::activation::Activation;
 use crate::avm2::e4x::{E4XNode, E4XNodeKind};
+use crate::avm2::error::make_error_1089;
 use crate::avm2::object::script_object::ScriptObjectData;
 use crate::avm2::object::{Object, ObjectPtr, TObject};
 use crate::avm2::value::Value;
@@ -417,7 +418,7 @@ impl<'gc> TObject<'gc> for XmlListObject<'gc> {
         }
 
         // 4. Return
-        Ok(())
+        Err(make_error_1089(activation))
     }
 
     fn get_next_enumerant(

tests/tests/swfs/from_avmplus/as3/RuntimeErrors/Error1089XmlAssignToMoreThanOneItemList/test.toml

@@ -1,2 +1 @@
 num_ticks = 1
-known_failure = true