src/main/software/amazon/event/ruler/RuleCompiler.java [655:673]:
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    private static Patterns processExistsExpression(final JsonParser parser) throws IOException {
        final JsonToken existsToken = parser.nextToken();
        Patterns existsPattern;

        if (existsToken == JsonToken.VALUE_TRUE) {
            existsPattern = Patterns.existencePatterns();
        } else if (existsToken == JsonToken.VALUE_FALSE) {
            existsPattern = Patterns.absencePatterns();
        } else {
            barf(parser, "exists match pattern must be either true or false.");
            return null;
        }

        if (parser.nextToken() != JsonToken.END_OBJECT) {
            barf(parser, "Only one key allowed in match expression");
            return null;
        }
        return existsPattern;
    }
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src/main/software/amazon/event/ruler/JsonRuleCompiler.java [813:831]:
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    private static Patterns processExistsExpression(final JsonParser parser) throws IOException {
        final JsonToken existsToken = parser.nextToken();
        Patterns existsPattern;

        if (existsToken == JsonToken.VALUE_TRUE) {
            existsPattern = Patterns.existencePatterns();
        } else if (existsToken == JsonToken.VALUE_FALSE) {
            existsPattern = Patterns.absencePatterns();
        } else {
            barf(parser, "exists match pattern must be either true or false.");
            return null;
        }

        if (parser.nextToken() != JsonToken.END_OBJECT) {
            barf(parser, "Only one key allowed in match expression");
            return null;
        }
        return existsPattern;
    }
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