Swap out `has_property`'s stub impl.

core/src/avm2/function.rs

@@ -114,6 +114,10 @@ impl<'gc> TObject<'gc> for FunctionObject<'gc> {
             .set_property(name, value, avm, context)
     }
 
+    fn has_property(self, name: &QName) -> bool {
+        self.0.read().base.has_property(name)
+    }
+
     fn as_ptr(&self) -> *const ObjectPtr {
         self.0.as_ptr() as *const ObjectPtr
     }

core/src/avm2/object.rs

@@ -65,9 +65,7 @@ pub trait TObject<'gc>: 'gc + Collect + Debug + Into<Object<'gc>> + Clone + Copy
     }
 
     /// Indicates whether or not a property exists on an object.
-    fn has_property(self, _name: &QName) -> bool {
-        false
-    }
+    fn has_property(self, _name: &QName) -> bool;
 
     /// Indicates whether or not a property exists on an object and is not part
     /// of the prototype chain.

core/src/avm2/script_object.rs

@@ -44,6 +44,10 @@ impl<'gc> TObject<'gc> for ScriptObject<'gc> {
             .set_property(name, value, avm, context)
     }
 
+    fn has_property(self, name: &QName) -> bool {
+        self.0.read().has_property(name)
+    }
+
     fn as_ptr(&self) -> *const ObjectPtr {
         self.0.as_ptr() as *const ObjectPtr
     }
@@ -91,4 +95,8 @@ impl<'gc> ScriptObjectData<'gc> {
 
         Ok(())
     }
+
+    pub fn has_property(&self, name: &QName) -> bool {
+        self.values.get(name).is_some()
+    }
 }