avm2: Implement `new MovieClip()`.

core/src/avm2/globals/flash/display/movieclip.rs

@@ -186,7 +186,11 @@ pub fn current_labels<'gc>(
         .and_then(|o| o.as_display_object())
         .and_then(|dobj| dobj.as_movie_clip())
     {
-        let scene = mc.current_scene().unwrap_or_else(Default::default);
+        let scene = mc.current_scene().unwrap_or_else(|| Scene {
+            name: "".to_string(),
+            start: 0,
+            length: mc.total_frames(),
+        });
         return Ok(labels_for_scene(activation, mc, &scene)?.2.into());
     }
 
@@ -203,7 +207,11 @@ pub fn current_scene<'gc>(
         .and_then(|o| o.as_display_object())
         .and_then(|dobj| dobj.as_movie_clip())
     {
-        let scene = mc.current_scene().unwrap_or_else(Default::default);
+        let scene = mc.current_scene().unwrap_or_else(|| Scene {
+            name: "".to_string(),
+            start: 0,
+            length: mc.total_frames(),
+        });
         let (scene_name, scene_length, scene_labels) = labels_for_scene(activation, mc, &scene)?;
         let scene_proto = activation.context.avm2.prototypes().scene;
         let args = [
@@ -233,8 +241,17 @@ pub fn scenes<'gc>(
         .and_then(|dobj| dobj.as_movie_clip())
     {
         let mut scene_objects = Vec::new();
+        let mut mc_scenes = mc.scenes();
 
-        for scene in mc.scenes() {
+        if mc.scenes().is_empty() {
+            mc_scenes.push(Scene {
+                name: "".to_string(),
+                start: 0,
+                length: mc.total_frames(),
+            });
+        }
+
+        for scene in mc_scenes {
             let (scene_name, scene_length, scene_labels) =
                 labels_for_scene(activation, mc, &scene)?;
             let scene_proto = activation.context.avm2.prototypes().scene;

core/tests/regression_tests.rs

@@ -400,6 +400,7 @@ swf_tests! {
     (as3_movieclip_currentscene, "avm2/movieclip_currentscene", 5),
     (as3_movieclip_scenes, "avm2/movieclip_scenes", 5),
     (as3_movieclip_play, "avm2/movieclip_play", 5),
+    (as3_movieclip_constr, "avm2/movieclip_constr", 1),
 }
 
 // TODO: These tests have some inaccuracies currently, so we use approx_eq to test that numeric values are close enough.

core/tests/swfs/avm2/movieclip_constr/output.txt

@@ -0,0 +1,21 @@
+//var that = new MovieClip()
+//currentFrame
+0
+//currentFrameLabel
+null
+//currentLabel
+null
+//currentLabels
+
+//(contents of currentScene)
+
+1
+//framesLoaded
+1
+//isPlaying
+false
+//(contents of scenes)
+
+1
+//totalFrames
+1