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It appears Java 8 has tightened up rules on casting. To fix some of the problems:
Prefer calling superclass methods to accessing the protected instance variables. For example:
short x, y, z; x = super.top(); super.pop(); y = super.top(); super.pop(); z = (short) x + y;
In dump, trying to output members of the
elements array can cause casting errors at runtime. A simple workaround is