public void setPlaceholder(int index, Ptg token) {if (_ptgs[index] != null) {throw new IllegalStateException("Invalid placeholder index (" + index + ")");}_ptgs[index] = token;}

public void SetPlaceholder(int index, Ptg token){if (_ptgs[index] != null){throw new InvalidOperationException("Invalid placeholder index (" + index + ")");}_ptgs[index] = token;}
