Initial environment loading (not working)

tests/Engine/MinimalEngine.cpp

@@ -0,0 +1,11 @@
+#include "EngineTest.h"
+
+struct Foo {};
+
+struct Derivate : public Foo {};
+
+TEST(RefPtr, ImplicitUpcast) {
+    OwningPtr<Derivate> owner = new Derivate();
+    RefPtr<Derivate> der = owner;
+    RefPtr<Foo> foo = der;
+}