Java Script - Is There a Restrictions on Google Closure Compatibility?

In closure script community, we love, we love Google closure and we use it a lot to generate our JavaScript code. So there are certain restrictions on, uh, Google closure compatible codes. Some of the assumptions we make is that just accessing a property on an object is never going to cause something to throw. We assume that that's not going to throw an exception just because you access something on a property on a method.