DEATH_TEST(EqOp, InvalidEooOperand, "Invariant failure _rhs") {
    BSONObj operand;
    EqualityMatchExpression eq;
    eq.init("", operand.firstElement()).ignore();
}
DEATH_TEST(EqOp, InvalidEooOperand, "Invariant failure _rhs") {
    BSONObj operand;
    EqualityMatchExpression eq;
    eq.init("", operand.firstElement()).ignore();
}