  Leading-twist operators have a remarkable property that their divergence
vanishes in a free theory. Recently it was suggested that this property can be
used for an alternative technique to calculate anomalous dimensions of
leading-twist operators and allows one to gain one order in perturbation theory
so that, i.e., two-loop anomalous dimensions can be calculated from one-loop
Feynman diagrams, etc. In this work we study feasibility of this program on a
toy-model example of the $\varphi^3$ theory in six dimensions. Our conclusion
is that this approach is valid, although it does not seem to present
considerable technical simplifications as compared to the standard technique.
It does provide one, however, with a very nontrivial check of the calculation
as the structure of the contributions is very different.
