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} if (ptgClass == FuncVarPtg.class) { return new FuncVarEval((FuncVarPtg)ptg); } if (ptgClass == ConcatPtg.class) { return new ConcatEval((ConcatPtg)ptg); } throw new RuntimeException("Unexpected operation ptg class (" + ptgClass.getName() + ")"); }