message: Fix do_finally operator
diff: @@ -33,15 +33,15 @@ public:
  }
  template <class Next, class... Steps>
  - void finally(Next& next, Steps&... steps) {
  + void on_complete(Next& next, Steps&... steps) {
  fn_();
  - next.finally(steps...);
  + next.on_complete(steps...);
  }
  template <class Next, class... Steps>
  - void finally(const error& what, Next& next, Steps&... steps) {
  + void on_error(const error& what, Next& next, Steps&... steps) {
  fn_();
  - next.finally(what, steps...);
  + next.on_error(what, steps...);
  }
  private:
  