Add a case that tests the robustness of the cache stack with nested try catches: ``` SomeSuccess() try SomeReversion() { //no-op } catch { try SomeReversion() { //no-op } catch { SomeSuccess() } } SomeSuccess() ``` The cache stack should handler inner reversions and maintain record of the successful actions. The ultimate end-state for the above pseudocode should be equivalent to the result of the following: ``` SomeSuccess() SomeSuccess() SomeSuccess() ```