@Override
  public void visitPrefixExpression(@NotNull PsiPrefixExpression expression) {
    myBuf.append(expression.getOperationSign().getText());
    final PsiExpression operand = expression.getOperand();
    if (operand != null) {
      operand.accept(this);
    }
  }
@Override
  public void visitPrefixExpression(@NotNull PsiPrefixExpression expression)