.classMappingForJavaClass_(receiver.getClass());
ClassMapping other = ImageBootstrapper.systemMapping
.classMappingForJavaClass_(arg.getClass());
AbstractClassMapping sm = cm;
while (sm != null) {
sm = sm.superclassMappingIn_(ImageBootstrapper.systemMapping);
if (sm == other)
return true;
}
return false;
}