Qml: Don't crash when as-casting to type with errors

Such types don't have a compilation unit, but we still know their names.

Fixes: QTBUG-98792
Change-Id: I2db8dea3a5a02ec1492f7f7a054fd3ad4c6ad69a
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>
(cherry picked from commit e0cd201e91ae64b9c03e0128cd17656b00611fbb)

1 files changed, 20 insertions, 0 deletions

diff --git a/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp b/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp
index ac6634290a..92d0069ce4 100644
--- a/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp
+++ b/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp
@@ -343,6 +343,8 @@ private slots:
     void bindingAliasToComponentUrl();
     void badGroupedProperty();
 
+    void objectAsBroken();
+
 private:
     QQmlEngine engine;
     QStringList defaultImportPathList;
@@ -5951,6 +5953,24 @@ void tst_qqmllanguage::badGroupedProperty()
              .arg(url.toString()));
 }
 
+void tst_qqmllanguage::objectAsBroken()
+{
+    QQmlEngine engine;
+    QQmlComponent c(&engine, testFileUrl("asBroken.qml"));
+    QVERIFY2(c.isReady(), qPrintable(c.errorString()));
+    QScopedPointer<QObject> o(c.create());
+    QVERIFY(!o.isNull());
+    QVariant selfAsBroken = o->property("selfAsBroken");
+    QVERIFY(selfAsBroken.isValid());
+
+    // 5.15 doesn't enforce type annotation. So the "as" cast succeeds even though
+    // the target type cannot be resolved.
+    QCOMPARE(selfAsBroken.value<QObject *>(), o.data());
+
+    QQmlComponent b(&engine, testFileUrl("Broken.qml"));
+    QVERIFY(b.isError());
+}
+
 QTEST_MAIN(tst_qqmllanguage)
 
 #include "tst_qqmllanguage.moc"