
public class Redwood extends Tree { public static void main(String[] args) { new Redwood().go(); } void go() { go2(new Tree(), new Redwood()); go2((Redwood) new Tree(), new Redwood()); } void go2(Tree t1, Redwood r1) { Redwood r2 = (Redwood)t1; Tree t2 = (Tree)r1; } } class Tree { }
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