private static GrExpression getNegated(@NotNull GrExpression exp) {
    final GrUnaryExpression prefixExp = (GrUnaryExpression) exp;
    final GrExpression operand = prefixExp.getOperand();
    return (GrExpression)PsiUtil.skipParentheses(operand, false);
  }
private static GrExpression getNegated(@NotNull GrExpression exp)