public class BugKiller {
	class Bar{
		String foo;
	}
	void baz(Object bar){
		if (bar == null){
			//let the ide know it might be null
		}
		String a = bar.toString();// null warning
		String b = ((Bar)bar).foo; //!!! No null warning
		Bar c = (Bar)bar;
		String d = c.foo; //!!! No null warning
	}
}