To deal with failures as simply as possible, we propose a new foundation for the core (untyped) C++, which is based on a new logic called task logic or imperative logic. We then introduce a sequential-disjunctive statement of the form S : R. This statement has the following semantics: execute S and R sequentially. It is considered a success if at least one of S, R is a success. This statement is useful for dealing with inessential errors without explicitly catching them.