code: public boolean isHot() {
          return getBThreadSnapshots().stream()
                      .map(BThreadSyncSnapshot::getSyncStatement)
                      .filter(SyncStatement::isHot)
                      .findAny().isPresent();
      }
docs: Returns {@code true} if any of the b-threads at this point is at a "hot"
  sync. Similar to the "hot cut" idiom in LSC.
  @return {@code true} is at least one of the b-threads is at a hot sync; {@code false} otherwise.