1917 Code of Canon Law
On Ecclesiastical Burial - (Canon 1239. 2)
 § 2. Catechumeni qui nulla sua culpa sine baptismo moriantur, baptizatis accensendi sunt.
    "Catechumens who, through no fault of their own, die without Baptism, are to be treated as baptized."

The Sacred Canons by Rev. John A. Abbo. St.T.L., J.C.D., and Rev. Jerome D. Hannan, A.M., LL.B., S.T.D., J.C.D.
 Commentary on the Code:
    "The reason for this rule is that they are justly supposed to have met death united to Christ through Baptism of Desire."

Genuinuely curious here - how do those who reject BOD understand the following from the Council of Trent and St Alphonsus in regards to the same?

Council of Trent 1545-1563
Canons on the Sacraments in General: - (Canon 4):
   "If anyone shall say that the sacraments of the New Law are not necessary for salvation, but are superfluous, and that although all are not necessary for every individual, without them or without the desire of them (sine eis aut eorum voto), through faith alone men obtain from God the grace of justification; let him be anathema."

8. It would be hard, believe me, to tear me away from these two pillars--I mean Augustine and Ambrose. I own to going along with them in wisdom or in error, for I too believe that a person can be saved by faith alone, through the desire to receive the sacrament, but only if such a one is forestalled by death or prevented by some other insuperable force from implementing this devout desire. Perhaps this was why the Savior, when he said: Whoever believes and is baptized will be saved, took care not to repeat 'whoever is not baptized', but only, whoever does not believe will be condemned, imitating strongly that faith is sometimes sufficient for salvation and that without it nothing suffices.  

The 1917 Code is not binding on the universal Church, but only the Latin rite. It can be argued that the Code does not possess infallibility.

   "7. Here, too, our beloved sons and venerable brothers, it is again necessary to mention and censure a very grave error entrapping some Catholics who believe that it is possible to arrive at eternal salvation although living in error and alienated from the true faith and Catholic unity. Such belief is certainly opposed to Catholic teaching. There are, of course, those who are struggling with invincible ignorance about our most holy religion. Sincerely observing the natural law and its precepts inscribed by God on all hearts and ready to obey God, they live honest lives and are able to attain eternal life by the efficacious virtue of divine light and grace. Because God knows, searches and clearly understands the minds, hearts, thoughts, and nature of all, his supreme kindness and clemency do not permit anyone at all who is not guilty of deliberate sin to suffer eternal punishments."
   "8. Also well known is the Catholic teaching that no one can be saved outside the Catholic Church. Eternal salvation cannot be obtained by those who oppose the authority and statements of the same Church and are stubbornly separated from the unity of the Church and also from the successor of Peter, the Roman Pontiff, to whom 'the custody of the vineyard has been committed by the Savior.'(Ecuмenical Council of Chalcedon in its letter to Pope Leo.) The words of Christ are clear enough: 'If he refuses to listen even to the Church, let him be to you a Gentile and a tax collector;'(Mt 15.17.) 'He who hears you hears me, and he who rejects you, rejects me, and he who rejects me, rejects him who sent me;'(Lk 10.16.) 'He who does not believe will be condemned;'(Mk 16.16.) 'He who does not believe is already condemned;'(Jn 3.18.) 'He who is not with me is against me, and he who does not gather with me scatters.'(Lk 11.23.) The Apostle Paul says that such persons are 'perverted and self-condemned;'(Ti 3.11.) the Prince of the Apostles calls them 'false teachers . . . who will secretly bring in destructive heresies, even denying the Master. . . bringing upon themselves swift destruction.'(2 Pt 2.1.) "

"But baptism of desire is perfect conversion to God by contrition or love of God above all things accompanied by an explicit or implicit desire for true Baptism of water, the place of which it takes as to the remission of guilt, but not as to the impression of the [baptismal] character or as to the removal of all debt of punishment. It is called 'of wind' ['flaminis'] because it takes place by the impulse of the Holy Ghost Who is called a wind ['flamen']. Now it is de fide that men are also saved by Baptism of desire, by virtue of the Canon 'Apostolicam De Presbytero Non Baptizato' and the Council of Trent, Session 6, Chapter 4, where it is said that no one can be saved 'without the laver of regeneration or the desire for it.'"

A description is introduced of the Justification of the impious, and of the Manner thereof under the law of grace. By which words, a description of the Justification of the impious is indicated,-as being a translation, from that state wherein man is born a child of the first Adam, to the state of grace, and of the adoption of the sons of God, through the second Adam, Jesus Christ, our Saviour. And this translation, since the promulgation of the Gospel, cannot be effected, without the laver of regeneration, or the desire thereof, as it is written; unless a man be born again of water and the Holy Ghost, he cannot enter into the Kingdom of God.

So, I believe it is absolutely safe to say that, "Catechumens who, through no fault of their own, die without Baptism, are to be treated as baptized."