private final Set<String> features = new HashSet<String>();

    @Override
    public void featureUsed(IncubatingFeatureUsage usage) {
        if (features.add(usage.getSummary())) {
            LOGGER.warn(String.format("%s is an incubating feature.", usage.getSummary()));
        }
    }

    public void reset() {
        features.clear();
    }

        this.problemIdDisplayName = problemIdDisplayName;
        this.problemId = problemId;
    }

    @VisibleForTesting
    DeprecatedFeatureUsage(DeprecatedFeatureUsage usage) {
        super(usage.getSummary(), usage.getCalledFrom());
        this.removalDetails = usage.removalDetails;
        this.advice = usage.advice;
        this.contextualAdvice = usage.contextualAdvice;
        this.documentation = usage.documentation;