4 files changed, 26 insertions, 6 deletions
diff --git a/src/declarative/qml/qmlbinding.cpp b/src/declarative/qml/qmlbinding.cpp
index b0a4d6e..ef92308 100644
--- a/src/declarative/qml/qmlbinding.cpp
+++ b/src/declarative/qml/qmlbinding.cpp
@@ -175,7 +175,18 @@ void QmlBinding::update(QmlMetaProperty::WriteFlags flags)
             bool isUndefined = false;
             QVariant value = this->value(&isUndefined);
 
-            if (!isUndefined && data->property.object() && 
+            if (isUndefined && !data->error.isValid()) {
+
+                QUrl url = data->url;
+                int line = data->line;
+                if (url.isEmpty()) url = QUrl(QLatin1String("<Unknown File>"));
+
+                data->error.setUrl(url);
+                data->error.setLine(line);
+                data->error.setColumn(-1);
+                data->error.setDescription(QLatin1String("Unable to assign [undefined] to ") + QLatin1String(QMetaType::typeName(data->property.propertyType())));
+
+            } else if (!isUndefined && data->property.object() && 
                 !data->property.write(value, flags)) {
 
                 QUrl url = data->url;
diff --git a/src/declarative/qml/qmlcompiler.cpp b/src/declarative/qml/qmlcompiler.cpp
index 8e92eb4..81ebd86 100644
--- a/src/declarative/qml/qmlcompiler.cpp
+++ b/src/declarative/qml/qmlcompiler.cpp
@@ -2340,6 +2340,7 @@ bool QmlCompiler::compileAlias(QMetaObjectBuilder &builder,
     QByteArray typeName;
 
     int propIdx = -1;
+    int flags = 0;
     bool writable = false;
     if (alias.count() == 2) {
         propIdx = idObject->metaObject()->indexOfProperty(alias.at(1).toUtf8().constData());
@@ -2359,8 +2360,12 @@ bool QmlCompiler::compileAlias(QMetaObjectBuilder &builder,
         typeName += "*";
     }
 
+    if (typeName.endsWith('*'))
+        flags |= QML_ALIAS_FLAG_PTR;
+
     data.append((const char *)&idObject->idIndex, sizeof(idObject->idIndex));
     data.append((const char *)&propIdx, sizeof(propIdx));
+    data.append((const char *)&flags, sizeof(flags));
 
     builder.addSignal(prop.name + "Changed()");
     QMetaPropertyBuilder propBuilder = 
diff --git a/src/declarative/qml/qmlvmemetaobject.cpp b/src/declarative/qml/qmlvmemetaobject.cpp
index 5315089..ed28d78 100644
--- a/src/declarative/qml/qmlvmemetaobject.cpp
+++ b/src/declarative/qml/qmlvmemetaobject.cpp
@@ -210,17 +210,18 @@ int QmlVMEMetaObject::metaCall(QMetaObject::Call c, int _id, void **a)
 
             if (id < metaData->aliasCount) {
 
-                if (!ctxt) return -1;
                 QmlVMEMetaData::AliasData *d = metaData->aliasData() + id;
+
+                if (d->flags & QML_ALIAS_FLAG_PTR && c == QMetaObject::ReadProperty) 
+                        *reinterpret_cast<void **>(a[0]) = 0;
+
+                if (!ctxt) return -1;
                 QmlContextPrivate *ctxtPriv = 
                     (QmlContextPrivate *)QObjectPrivate::get(ctxt);
 
                 QObject *target = ctxtPriv->idValues[d->contextIdx].data();
-                if (!target) {
-                    if (d->propertyIdx == -1) 
-                        *reinterpret_cast<QObject **>(a[0]) = target;
+                if (!target) 
                     return -1;
-                }
 
                 if (c == QMetaObject::ReadProperty && !aConnected.testBit(id)) {
                     int sigIdx = methodOffset + id + metaData->propertyCount;
diff --git a/src/declarative/qml/qmlvmemetaobject_p.h b/src/declarative/qml/qmlvmemetaobject_p.h
index 9262b19..f2ee09b 100644
--- a/src/declarative/qml/qmlvmemetaobject_p.h
+++ b/src/declarative/qml/qmlvmemetaobject_p.h
@@ -61,6 +61,8 @@
 
 QT_BEGIN_NAMESPACE
 
+#define QML_ALIAS_FLAG_PTR 0x00000001
+
 struct QmlVMEMetaData
 {
     short propertyCount;
@@ -71,6 +73,7 @@ struct QmlVMEMetaData
     struct AliasData {
         int contextIdx;
         int propertyIdx;
+        int flags;
     };
     
     struct PropertyData {