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