In this release of FunC two compiler bugs were fixed. Both manifest in unusual conditions and scanning onchain history for last months didn't revealed any manifestation in the wild. So apparently existing contracts are safe thanks to culture of thorough integrational testing in developer community!
Great job 👍
Still, if you are deploying a new contracts we recommend you to switch to new compiler version.
1) First bug is related to
try/catch construction, where inside try branch a function that modifies c1/с3 is called. That may happen in case of non-trivial branching in this child function or using set_c3. How to check.2) Second bug is related to storing function into variable. In this case, in FunC <=0.4.5 impure modifier of this functions was dropped.