After the Commonwealth filed its petition for rehearing, following the court’s opinion reported ante 567 *769(1982), the court invited the defendants to submit a brief or a letter on the sole issue whether the defendants may be re-sentenced under G. L. c. 94C, § 34, which punishes, inter alla, possession of heroin. The court has treated the letters from the district attorney and the Attorney General in support of the petition for rehearing as memoranda of law.
The issue of possession as a lesser included offense within the crime of unlawful manufacture and distribution was not argued originally by the Commonwealth in its brief or at oral argument. However, the indictments charge that the defendants did “knowingly or intentionally manufacture, distribute, dispense, or possess with intent to manufacture, distribute, or dispense a controlled substance to wit: Heroin, a class A substance.” Under this indictment one who knowingly or intentionally manufactures, distributes or dispenses heroin possesses the heroin, actually or constructively.
The assertion in the dissenting opinion that these defendants can be resentenced under G. L. c. 94C, § 32, as it existed before the comprehensive revision of the drug sentencing laws in 1980 (St. 1980, c. 436) cannot be left unchallenged. The dissenting opinion urges this court to apply a “rule of revival.” This argument has not been raised by any of the parties at any point in these proceedings. If we were to follow our usual practice, the issue would be deemed to have been waived by the failure either to brief or argue the point. Mass. R.A.P. 16 (a) (4), as amended, 367 Mass. 919 (1975). Wolfberg v. Hunter, 385 Mass. 390, 392 n.3 (1982). This principle has special force when, as is the case here, the point has not been raised even in the petition for rehearing.
The Commonwealth’s failure to raise the point is understandable. The dissenting opinion is simply wrong in suggesting (“[t]here is some precedent,” infra at 774) that this “rule of revival” has been a part of our jurisprudence. The cases cited in the dissenting opinion deal only with the issue of severability and do not embrace this so called “rule of revival.”2 Even if it were conceded that these cases hint at *770some notion of “revival,” they did not place the defendants on notice that the former G. L. c. 94C, § 32, would be applied to them. Other than Commonwealth v. Kimball, 299 Mass. 353 (1938), in which the dictum clearly goes to sever-ability, they are all civil cases and, in addition to their age,3 provide no indication that the “rule of revival” would ever be applied in a criminal case in this Commonwealth.4
The fundamental flaw of the dissenting opinion is its unwillingness to face up to the plain consequences of the court’s holding. The issue in this case is whether the defendants had sufficient notice of the penalty which attached to their conduct to satisfy due process requirements. Therefore it would be reasonable to expect the dissenting opinion to explain how the “rule of revival” provided these defendants with adequate notice of their punishment.5
It is quite apparent that the application of the “rule of revival” in this case would be unconstitutional. These convictions can be upheld only if the prior G. L. c. 94G, § 32, *771provided adequate notice of the penalty which attached to the defendants’ conduct. To reach that conclusion, we would have to reason, first, that the new G. L. c. 94C, § 32 (a), gave adequate public notice of its own invalidity and, second, that the public, thus informed, was then put on further notice that the apparent repeal of the old § 32 was ineffective. See United States ex rel. Clark v. Anderson, 502 F.2d 1080, 1082 (3d Cir. 1974).6 Neither of these elements is satisfied here.
Certainly, the Commonwealth would not accept the proposition that the statute gave notice of its own invalidity. It has argued throughout these proceedings that the statute is constitutional. The trial judge also shared that view. In these circumstances, it cannot be said that the public had any notice that the apparent repeal of the prior statute was ineffective. Since the “rule of revival” has not been adopted by this court, the defendants had no adequate notice of the penalty attaching to their conduct.
Due to the dearth of Massachusetts authority in favor of “revival,” the dissenting opinion necessarily falls back on the citation of cases from other jurisdictions.7 None of these cases, however, supports the application of a “rule of revival” in the present circumstances. The cases (1) reach results inconsistent with revival, e.g., Davis v. Wallace, 257 U.S. 478, 484-485 (1922) (where an excepting provision is declared unconstitutional, preexisting law cannot be applied to persons within the exception); (2) relate only tangentially to the instant case, e.g., Chicago, I. & L. Ry. v. Hackett, 228 U.S. 559, 566 (1913) (an unconstitutional Federal stat*772ute does not preempt State law); or (3) do not address the present circumstances, e.g., State v. Collins, 528 S.W.2d 814, 815 (Tenn. 1975) (defendant convicted and sentenced under statute in effect at time of his criminal conduct). Moreover, some of the jurisdictions that have adopted a “rule of revival” have held that a person cannot be convicted for a crime committed during the period which elapses between the “attempted” repeal of the criminal statute under which the defendant was charged and the pronouncement of unconstitutionality of the repealing statute by court decision. See Lutwin v. State, 97 N.J.L. 67 (1922).8 This is not unlike the situation here.
The “rule of revival” has little merit. In the present setting, its application would be a form of judicial lawmaking. The amendments to the act in 1980 (St. 1980, c. 436, § 4) worked a comprehensive revision of the former G. L. c. 94C, § 32, and it would be sheer speculation to say what penalty the Legislature would have enacted had the lawmakers known of the result in this case. That they would have provided for some penalty does not tell us what that penalty would have been.9 United States v. Evans, 333 U.S. 483, 495 (1948) (clear intent to punish proscribed conduct does not authorize court to fix a penalty where the statute is too uncertain). See also Mayor of Boston v. Treasurer & Receiver Gen., 384 Mass. 718, 731 (1981) (Hennessey, C.J., dissenting) (where Legislature had any number of alternatives available to it, it is sheer conjecture to say that one of these alternatives would not have been adopted). It is not for this court to establish criminal penalties. The opinion of the court therefore eschews this “rule of revival.”
The judgments are reversed in so far as the indictments charge violations of G. L. c. 94C, § 32 (a), and the findings *773of the judge are set aside in so far as they find the defendants guilty of such violations. The cases are remanded to the Superior Court, where the judge is to enter an order dismissing the indictments except as to the lesser included offense of possession of heroin. Findings of guilty of that offense may be entered, and the defendants may be sentenced pursuant to G. L. c. 94C, § 34, which punishes the possession of heroin.10
So ordered.
A fair statement of our law is that a statute which has been declared unconstitutional is not wholly without effect but is unenforceable, see *770Lawton Spinning Co. v. Commonwealth, 232 Mass. 28, 36 (1919), unless the objectionable portion can be severed. Del Duca v. Town Adm’r of Methuen, 368 Mass. 1, 13 (1975). Thus, subsequent repeal of an unconstitutional statute which, when read in conjunction with a prior statute rendered the prior statute unconstitutional, served to validate the prior statute. Lawton Spinning Co. v. Commonwealth, supra at 32-35. An amendment which eliminated a constitutionally required exception to a State excise tax could be “treated as quite distinct and severable from the prior statutes.” Opinion of the Justices, 269 Mass. 611, 615 (1929). An “unimportant exception” to a general prohibition could be severed if the exception were found unconstitutional. Commonwealth v. Kimball, 299 Mass. 353, 360 (1938).
The inability of the dissenting judge to cite a single modern decision of this court indicates that it has long been recognized that notions of “revival” have never been applied in our cases.
The closest criminal analogy in our cases suggests that “revival” cannot be used to support a conviction for conduct committed after the repeal of a statute but before it has been deemed revived. See Commonwealth v. Marshall, 11 Pick. 350 (1831).
Focusing mainly on the possible State prison sentences, we note that the minimum State prison sentence under prior G. L. c. 94C, § 32, is two and one-half years and under new G. L. c. 94C, § 32 (a), the minimum sentence is one year. We view that difference as significant.
The dissenting opinion states that the reasoning of the Anderson case “does not apply here,” infra at 774, since that case dealt with notice of proscribed conduct. Our holding, however, makes clear that the “fundamental tenet of due process that ‘[n]o one may be required ... to speculate as to the meaning of penal statutes’” applies “to sentencing as well as substantive provisions.” Commonwealth v. Gagnon, ante 567, 569 (1982), quoting United States v. Batchelder, 442 U.S. 114, 123 (1979).
The dissenting opinion does not tell us how these cases provided adequate notice to the defendants in this case of the penalty attaching to their conduct.
Thus the rule is applied in other jurisdictions prospectively from the decision of the court to void the superseding statute. See State v. Kolocotronis, 73 Wash. 2d 92, 104-105 (1968).
The point is highlighted by our inability to determine the intent of the Legislature when it enacted the 1980 amendments. See Commonwealth v. Gagnon, supra at 569-574.
The Commonwealth’s motion to stay the issuance of a rescript is denied.