core/src/main/java/org/apache/brooklyn/core/workflow/utils/WorkflowConcurrencyParser.java [147:175]:
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        return Maybe.absent();
    }

    public <T> T notNull(T value, String message) {
        if (value!=null) return value;
        throw error(message);
    }

    public boolean eat(String word) {
        return eat(word, false);
    }
    public boolean eat(String word, boolean requireNextNonAlpha) {
        if (rest.startsWith(word)) {
            rest = rest.substring(word.length());
            if (requireNextNonAlpha && !rest.isEmpty() && Character.isJavaIdentifierPart(rest.charAt(0))) {
                rest = word + rest;
                return false;
            }
            rest = Strings.trimStart(rest);
            return true;
        }
        return false;
    }

    public boolean eatNA(String word) {
        return eat(word, true);
    }

    protected RuntimeException error(String prefix) {
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core/src/main/java/org/apache/brooklyn/core/workflow/utils/WorkflowRetentionParser.java [258:286]:
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        return Maybe.absent();
    }

    public <T> T notNull(T value, String message) {
        if (value!=null) return value;
        throw error(message);
    }

    public boolean eat(String word) {
        return eat(word, false);
    }
    public boolean eat(String word, boolean requireNextNonAlpha) {
        if (rest.startsWith(word)) {
            rest = rest.substring(word.length());
            if (requireNextNonAlpha && !rest.isEmpty() && Character.isJavaIdentifierPart(rest.charAt(0))) {
                rest = word + rest;
                return false;
            }
            rest = Strings.trimStart(rest);
            return true;
        }
        return false;
    }

    public boolean eatNA(String word) {
        return eat(word, true);
    }

    protected RuntimeException error(String prefix) {
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