// Go up the causal chain to see if we've already seen this cause; if we have, even if
        // it's wrapped by a different exception, don't log it.
        boolean firstTimeSeeingThisException = addCausalChain(getOrInitSeenExceptions(), throwable);
        if (firstTimeSeeingThisException) {
          log(throwable);
          return;
        }
      }
    }

    /*