src/com/amazon/ion/impl/IonReaderBinaryUserX.java [301:330]:
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    private int _symbol_table_top = 0;
    private SymbolTable[] _symbol_table_stack = new SymbolTable[3]; // 3 is rare, IVM followed by a local sym tab with open content
    private void clear_system_value_stack()
    {
        while (_symbol_table_top > 0) {
            _symbol_table_top--;
            _symbol_table_stack[_symbol_table_top] = null;
        }
    }
    private void push_symbol_table(SymbolTable symbols)
    {
        assert(symbols != null);
        if (_symbol_table_top >= _symbol_table_stack.length) {
            int new_len = _symbol_table_stack.length * 2;
            SymbolTable[] temp = new SymbolTable[new_len];
            System.arraycopy(_symbol_table_stack, 0, temp, 0, _symbol_table_stack.length);
            _symbol_table_stack = temp;
        }
        _symbol_table_stack[_symbol_table_top++] = symbols;
    }
    @Override
    public SymbolTable pop_passed_symbol_table()
    {
        if (_symbol_table_top <= 0) {
            return null;
        }
        _symbol_table_top--;
        SymbolTable symbols = _symbol_table_stack[_symbol_table_top];
        _symbol_table_stack[_symbol_table_top] = null;
        return symbols;
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src/com/amazon/ion/impl/IonReaderTextUserX.java [232:261]:
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    private int _symbol_table_top = 0;
    private SymbolTable[] _symbol_table_stack = new SymbolTable[3]; // 3 is rare, IVM followed by a local sym tab with open content
    private void clear_system_value_stack()
    {
        while (_symbol_table_top > 0) {
            _symbol_table_top--;
            _symbol_table_stack[_symbol_table_top] = null;
        }
    }
    private void push_symbol_table(SymbolTable symbols)
    {
        assert(symbols != null);
        if (_symbol_table_top >= _symbol_table_stack.length) {
            int new_len = _symbol_table_stack.length * 2;
            SymbolTable[] temp = new SymbolTable[new_len];
            System.arraycopy(_symbol_table_stack, 0, temp, 0, _symbol_table_stack.length);
            _symbol_table_stack = temp;
        }
        _symbol_table_stack[_symbol_table_top++] = symbols;
    }
    @Override
    public SymbolTable pop_passed_symbol_table()
    {
        if (_symbol_table_top <= 0) {
            return null;
        }
        _symbol_table_top--;
        SymbolTable symbols = _symbol_table_stack[_symbol_table_top];
        _symbol_table_stack[_symbol_table_top] = null;
        return symbols;
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