final Map<File, Set<String>> errors = new LinkedHashMap<>();

        getLogger().debug("Loading keywords from {}", jsonKeywords.getName());

        final Map<String, Set<String>> languagesByKeyword = loadKeywords();

        // incrementally evaluate input files
        StreamSupport.stream(inputChanges.getFileChanges(getInputFiles()).spliterator(), false)
            .filter(f -> f.getChangeType() != ChangeType.REMOVED)